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Articles 4261 - 4290 of 59385
Full-Text Articles in Entire DC Network
Table Of Contents, The Editors
Geological Technological Innovations And Contributions In The Exploration And Development Of The Shenfu Coalfield, Fan Limin
Coal Geology & Exploration
Background The discovery and exploration of the Shenfu coalfield (i.e., a Jurassic coalfield in northern Shaanxi Province) represent the most significant achievement in China’s coal industry during the 6th Five-Year Plan of the country, marking the onset of the strategic westward shift of China’s coal industry. The complex discovery and exploration processes of the Shenfu coalfield have yielded valuable technological innovations. A summary of advances in the geological exploration and research of this coalfield will provide significant implications and references for the geologic work and green development of major coal-producing areas in West China. Advances First, research on the coal …
Mining-Induced Fault Slip: Assessment Model And Method For Determining Fault Instability Ranges, Zhao Hongbao, Zhang Bo, Zhang Chi, Ji Dongliang
Mining-Induced Fault Slip: Assessment Model And Method For Determining Fault Instability Ranges, Zhao Hongbao, Zhang Bo, Zhang Chi, Ji Dongliang
Coal Geology & Exploration
Objective Faults are highly susceptible to activation and slip instability under the influence of mining. This might trigger many disasters such as mine earthquakes, posing serious threats to mine safety. Therefore, it is necessary to analyze the mechanical mechanisms behind mining-induced fault activation and determine the ranges of mutual feedback between mining and fault activation in advance. Methods With the 213B mining face of the Xinzhi coal mine as the engineering background, this study analyzed the fault activation process induced by mining and created an elastic mechanical model for the impacts of mining on the surrounding rocks of faults. Accordingly, …
Geological Characteristics And Key Technologies For Exploration And Development Of The Yanchuannan Coalbed Methane Field, Ordos Basin, He Xipeng, Xiao Cui, Gao Yuqiao, Li Xin, Guo Tao, Cai Xiao
Geological Characteristics And Key Technologies For Exploration And Development Of The Yanchuannan Coalbed Methane Field, Ordos Basin, He Xipeng, Xiao Cui, Gao Yuqiao, Li Xin, Guo Tao, Cai Xiao
Coal Geology & Exploration
Objective China boasts abundant coalbed methane (CBM) resources, which serve as a crucial replacement for the reserve growth and production addition of natural gas resources. In recent years, CBM exploration and production have gradually expanded into deep, thin coal seams, which, however, are characterized by strong heterogeneity, ultra-low permeability, high in situ stress, and complex enrichment patterns. Therefore, the exploration and exploitation of deep, thin coal seams face challenges such as inadequate geological theories, poor adaptability of key technologies, and low investment returns, which hinder large-scale commercial CBM production. Methods Focusing on the exploration and exploitation practice of middle-deep, thin …
Exploring Sandstone-Hosted Uranium Deposits In Coal-Bearing Basins Using Geophysical Methods: A Case Study Of The East-Central Erlian Basin, Liang Jiangang, Kuang Haiyang, Cao Zhanning, Yang Weimin
Exploring Sandstone-Hosted Uranium Deposits In Coal-Bearing Basins Using Geophysical Methods: A Case Study Of The East-Central Erlian Basin, Liang Jiangang, Kuang Haiyang, Cao Zhanning, Yang Weimin
Coal Geology & Exploration
Background Sandstone-hosted uranium deposits, critical to the uranium resources growth in China, are extensively distributed in continental and marine-continental transitional sedimentary rocks. Currently, the exploration and research on these deposits in China focus primarily on the Meso-Cenozoic sedimentary basins in the northern regions. Objective and Methods The Erlian Basin exhibits the coexistence of uranium, coals, and oil. This study investigated the east-central part of this basin using multiple geophysical data, including regional gravity survey, aeromagnetic survey, and airborne radioactivity survey (ARS). Furthermore, six 2D seismic profiles totaling 130 km in length were deployed, and instantaneous soil radon measurement as employed. …
Impacts Of Diamond Particle Sizes On Performance Of Ni-Cu Superhydrophobic Coatings On Drilling Tool Surfaces, Wen Qi, Li Tao, Duan Longchen, Pan Bingsuo
Impacts Of Diamond Particle Sizes On Performance Of Ni-Cu Superhydrophobic Coatings On Drilling Tool Surfaces, Wen Qi, Li Tao, Duan Longchen, Pan Bingsuo
Coal Geology & Exploration
Objective Applying superhydrophobic coatings on drilling tool surfaces can effectively alleviate the challenges posed by drill bit balling and core barrel blockage. However, the limited mechanical stability of superhydrophobic coatings has somewhat hindered their widespread application in practical operations. Methods To improve the durability of superhydrophobic coatings, this study co-deposited diamond micropowder into Ni-Cu composite coating using composite electrodeposition, followed by surface modification using 1H,1H,2H,2H-perfluorodecyltrimethoxysilane (PFDTES). Employing a variety of testing methods, this study investigated the impacts of the mass fractions of diamonds with particle sizes of 1 μm and 20 μm (also referred to as diamonds W1 and W20, …
Glacial Isostatic Adjustments And Their Impact On Sea-Level Predictions, Dayne M. Williams, Jeanne Sumrall
Glacial Isostatic Adjustments And Their Impact On Sea-Level Predictions, Dayne M. Williams, Jeanne Sumrall
SACAD: Scholarly Activities
Relative sea level adjustments and their effects directly contribute to modern day climate change and ocean knowledge. This is shown through Glacial isostatic adjustment models which depend on ice thickness, time period, and core analyzations within a local region. These models demonstrate a direct correlation between RSL, era of retreat, and ice thickness even with comparison of other similar models, with some minor discrepancies. These discoveries led to several new advancements within the field of glaciology regionally and nationally. Generally concluding that the research done isn’t sufficient and more data regionally is needed to study its impacts more detailed.
Primary Geological Characteristics, Advances In Exploration And Production, And Strategies Of Coalbed Methane In South China, Guo Tao, Zhou Yatong, Jin Xiaobo, Gao Xiaokang, Peng Xingping
Primary Geological Characteristics, Advances In Exploration And Production, And Strategies Of Coalbed Methane In South China, Guo Tao, Zhou Yatong, Jin Xiaobo, Gao Xiaokang, Peng Xingping
Coal Geology & Exploration
Objective and Methods South China contains abundant coalbed methane (CBM) resources from numerous, superimposed, thin coal seams, serving as a significant replacement for China’s CBM exploration and production in the future. Despite significant progress in recent years, the CBM industry still faces several challenges in comprehensive and effective production. To accelerate its development, this study summarizes the primary geological characteristics of CBM resources in South China, organizes the current status and advances in CBM exploration and production in this region, and proposes corresponding technical strategies. Results The results indicate that the abundant CBM resources in South China exhibit coal seams …
Stratigraphic Characteristics And Shale Gas Enrichment Interval Distribution Of The Lower Cambrian Qiongzhusi Formation, Upper Yangtze Region, China, Wang Hongyan, Shi Zhensheng, Zhao Qun, Zhou Tianqi, Wang Pengfei
Stratigraphic Characteristics And Shale Gas Enrichment Interval Distribution Of The Lower Cambrian Qiongzhusi Formation, Upper Yangtze Region, China, Wang Hongyan, Shi Zhensheng, Zhao Qun, Zhou Tianqi, Wang Pengfei
Coal Geology & Exploration
Objective Shales in the Lower Cambrian Qiongzhusi Formation within the Upper Yangtze region preserve critical information about primitive oceans. Furthermore, these shales serve as vital source rocks and reservoirs, having demonstrated considerable potential for shale gas exploration. Methods Using seismic, borehole, and outcrop data, this study investigated the shale strata and their distribution in the Qiongzhusi Formation through comparative analysis. Accordingly, the sweet-spot interval was determined. Results and conclusions The results indicate that the Lower Cambrian Qiongzhusi Formation in the Upper Yangtze region can be divided into the first and second members (also referred to as the Qiong 1 and …
Advances In Research On Technologies For Large-Scale Coal Gangue Utilization For Green Mine Construction, Shi Quanlin, Long Lihua, Yang Qian, Wang Shaohui, Xie Dawei
Advances In Research On Technologies For Large-Scale Coal Gangue Utilization For Green Mine Construction, Shi Quanlin, Long Lihua, Yang Qian, Wang Shaohui, Xie Dawei
Coal Geology & Exploration
Background The coal gangue, a solid waste, features high production and a continuous increase in the amount piled in China. The long-term piling up of coal gangue will cause the waste of land resources and environmental pollution in mining areas. Various methods for utilizing coal gangue, such as preparing high-value-added chemical products and extracting useful elements, suffer a limited consumption capacity, failing to meet the requirements of large-scale disposal and utilization of solid wastes and green mine construction. Advances The comprehensive utilization of coal gangue for mining area reclamation and underground backfilling represents a critical direction for its large-scale disposal …
Advances In Research On The Mechanical Responses Of Hot Dry Granites Under Varying Cooling Conditions In China, Xie Jingyu, Song Jiwei, Sui Jiancai, Zhao Meng, Wang Ren, Zeng Chong, Wang Jianlong
Advances In Research On The Mechanical Responses Of Hot Dry Granites Under Varying Cooling Conditions In China, Xie Jingyu, Song Jiwei, Sui Jiancai, Zhao Meng, Wang Ren, Zeng Chong, Wang Jianlong
Coal Geology & Exploration
Significance Enhanced geothermal systems (EGSs) serve as a key technique for exploiting hot dry rocks (HDRs) presently. During the construction and operation of EGSs, rocks of the HDR reservoirs will experience various cooling conditions, such as natural cooling, cyclic cooling, and water cooling, rendering it greatly significant to investigate the mechanical response characteristics of granites—typical HDRs—under varying cooling conditions. Advances This study offers a summary and analysis of experimental data about the mechanical responses, i.e., uniaxial compressive strength (σc), elastic modulus (E), tensile strength (σt), and Poisson's ratio (ν), of …
Engineering Practice Of Advance Gas Control For Crushed Soft Coal Seams Through Directional Fracturing Using A Long Borehole In The Coal Seam Roof, Jia Bingyi, Li Shugang, Chen Dongdong, Zhang Qun
Engineering Practice Of Advance Gas Control For Crushed Soft Coal Seams Through Directional Fracturing Using A Long Borehole In The Coal Seam Roof, Jia Bingyi, Li Shugang, Chen Dongdong, Zhang Qun
Coal Geology & Exploration
Objective and Methods The crushed soft coal seams susceptible to intense coal and gas outbursts exhibit high gas content and pressure. Consequently, during borehole drilling for regional gas pre-drainage in such coal seams, high blowout intensity is prone to cause gas overrun and low drilling efficiency. To accelerate its development, this study analyzed the status and adaptability of existing technologies for regional advance gas drainage and pressure relief, as well as the fracture propagation characteristics of coal seam roofs during indirect fracturing using boreholes near the roofs. Accordingly, this study proposed an advance gas drainage and pressure relief technology for …
Dynamic Evolutionary Pattern Of Fractures In Tectonically Deformed Coal-Bearing Assemblages During Loading, Zhao Pengxiang, Liu Yingying, Li Shugang, Liu Yanqun, Liu Yunchuan, Wang Laolao, Lu Weidong
Dynamic Evolutionary Pattern Of Fractures In Tectonically Deformed Coal-Bearing Assemblages During Loading, Zhao Pengxiang, Liu Yingying, Li Shugang, Liu Yanqun, Liu Yunchuan, Wang Laolao, Lu Weidong
Coal Geology & Exploration
Objective The formation and evolution of fractures in tectonically deformed coals (TDCs) exert a significant influence on the occurrence of dynamic hazards to TDC-bearding combinations under mining disturbance. However, the influence patterns remain unclear. Methods Using a NanoVoxel-3000 high-resolution inspection system for multiscale integrated geotechnical scanning and analysis, this study performed uniaxial compression and CT scanning experiments on TDC-bearing combination specimens. Moreover, this study reconstructed the mesoscopic geometric structures of the specimens using the Avizo software, obtaining three-dimensional visualization models of fractures inside the specimens. Results and Conclusions During loading of a specimen studied, fractures were generated in the TDC …
Tundra Recovery Post-Fire In The Yukon-Kuskokwim Delta, Alaska, Leah K. Clayton, Kevin Schaefer, Elizabeth E. Hoy, Clayton D. Elder, Nancy H. F. French, Gerald V. Frost, Et.Al.
Tundra Recovery Post-Fire In The Yukon-Kuskokwim Delta, Alaska, Leah K. Clayton, Kevin Schaefer, Elizabeth E. Hoy, Clayton D. Elder, Nancy H. F. French, Gerald V. Frost, Et.Al.
Michigan Tech Publications
The extent of wildfires in tundra ecosystems has dramatically increased since the turn of the 21st century due to climate change and the resulting amplified Arctic warming. We simultaneously studied the recovery of vegetation, subsurface soil moisture, and active layer thickness (ALT) post-fire in the permafrost-underlain uplands of the Yukon-Kuskokwim Delta in southwestern Alaska to understand the interaction between these factors and their potential implications. We used a space-for-time substitution methodology with 2017 Landsat 8 imagery and synthetic aperture radar products, along with 2016 field data, to analyze tundra recovery trajectories in areas burned from 1953 to 2017. We found …
A New Quantitative Assessment Model For The Joint Roughness Of Rock Masses, Chen Shijiang, Liu Hongwei, Li Tao, Yue Hu, Liu Jiangang, Yu Jiang
A New Quantitative Assessment Model For The Joint Roughness Of Rock Masses, Chen Shijiang, Liu Hongwei, Li Tao, Yue Hu, Liu Jiangang, Yu Jiang
Coal Geology & Exploration
Objective The joint roughness of rock masses significantly affects their mechanical properties such as shear strength and permeability. Therefore, its quantitative characterization is significant for the engineering practices of jointed rock masses. Current research achievements indicate that among statistical parameters, the root mean square (RMS) of first derivatives (Z2) exhibits the strongest correlation with the joint roughness of rock masses, serving as a vital method for characterizing joint roughness. However, the characterization using this parameter is severely affected by the sampling interval (SI). Methods Based on a systematic analysis of the drawbacks of Z2 in characterizing …
Zonal Prediction Of The Heights Of Water-Conducting Fracture Zones Under Varying Overburden Types In North China-Type Coalfields, Xu Dongjing, Zhang Ruiqing, Gao Weifu, Jiang Haonan, Zhu Haifeng, Li Ye, Xia Zhicun
Zonal Prediction Of The Heights Of Water-Conducting Fracture Zones Under Varying Overburden Types In North China-Type Coalfields, Xu Dongjing, Zhang Ruiqing, Gao Weifu, Jiang Haonan, Zhu Haifeng, Li Ye, Xia Zhicun
Coal Geology & Exploration
Background The gradual increase in the exploitation depth and intensity of coal resources in the North China-type coalfields has caused problems such as overburden movement and damage, as well as fracture evolution. These hot topics have attracted considerable attention. Methods A total of 117 sets of measured data on the heights of water-conducting fracture zones in the North China-type coalfields were collected, consisting of 17 sets from hard overburden, 42 sets from moderately hard overburden, and 58 sets from soft overburden. Using these data, this study explored the effects of varying mining heights, mining depths, and lengths of the mining …
A Method For Time Difference Correction For Real-Time Seismic-While-Mining Data, Jin Dan
A Method For Time Difference Correction For Real-Time Seismic-While-Mining Data, Jin Dan
Coal Geology & Exploration
Objective Seismic-while-mining (SWM) data are usually acquired using multiple stations, each of which is equipped with multiple data acquisition traces. However, the SWM data received by these stations exhibit time differences due to the lack of GPS signals underground and the fact that current network synchronization technologies are confined by network delays underground. Given that the time synchronization accuracy directly affects the quality of data processing and imaging, the time difference correction of real-time SWM data is essential for accurate SWM detection. Methods Since current high-precision timing systems on the surface suffer from signal loss underground, this study proposed an …
Influencing Mechanisms Of Microwave Radiation Duration On The Efficiency Of Methane Adsorption In Coals, Hu Yiliang, Bao Yuan, Meng Jiahao, Chen Xueru, Shan Tuo
Influencing Mechanisms Of Microwave Radiation Duration On The Efficiency Of Methane Adsorption In Coals, Hu Yiliang, Bao Yuan, Meng Jiahao, Chen Xueru, Shan Tuo
Coal Geology & Exploration
Objective Microwave radiation duration represents a critical factor in enhancing coalbed methane (CBM) recovery using microwave-aided methods. However, the influencing mechanism of microwave radiation duration on the efficiency of methane adsorption in coal seams remains unclear. This necessitates delving into the specific effects of microwave radiation duration on the adsorption efficiency and unveiling their intrinsic constraints. Methods This study investigated the No.2 coal seam in the Huangling mining area. The coal samples were irradiated for 0‒18 min using 700 W microwaves. Using experiments and analyses including isothermal adsorption, low-temperature liquid N2 adsorption, and Fourier transform infrared spectroscopy (FTIR), this study …
Assessment Indicator System For Siting Of Geologic Co2 Sequestration In Low-Porosity And Low-Permeability Saline Aquifers: A Case Study Of The Ordos Basin, Mou Yu, Wang Haofan, Shaanxi Key Laboratory For Carbon Neutral Technology, Carbon Neutrality College (Yulin), Northwest University, Xi’An 710069, China Xuejun, Ma Jinfeng, Luo Shaocheng, Li Lin, Ding Zhao
Assessment Indicator System For Siting Of Geologic Co2 Sequestration In Low-Porosity And Low-Permeability Saline Aquifers: A Case Study Of The Ordos Basin, Mou Yu, Wang Haofan, Shaanxi Key Laboratory For Carbon Neutral Technology, Carbon Neutrality College (Yulin), Northwest University, Xi’An 710069, China Xuejun, Ma Jinfeng, Luo Shaocheng, Li Lin, Ding Zhao
Coal Geology & Exploration
Objective CO2 injection and geologic sequestration in deep saline aquifers as underground spatial resources represents an important means of achieving the targets of greenhouse gas emission reduction and carbon neutrality. Current assessments of the siting and potential for geologic CO2 sequestration in saline aquifers focus primarily on the macroscopic basin and regional scales, with the assessment indicator system scarcely accounting for the suitability of low-porosity and low-permeability strata. Methods Using data from 192 wells in the Yusheng area, Ordos Basin, this study conducted the division and correlation of intervals bearing no hydrocarbon, carried out lithologic and physical interpretations …
Optimization And Application Of Sand Bailing Technology For Coalbed Methane Horizontal Wells, Zhang Fei, Wang Yibing, Cheng Lu, Mei Wenbo, Yang Qi, Shen Wenjie, Cao Chao, Lai Peng, Liao Zhengkai, Xian Bao'an, Bi Yansen
Optimization And Application Of Sand Bailing Technology For Coalbed Methane Horizontal Wells, Zhang Fei, Wang Yibing, Cheng Lu, Mei Wenbo, Yang Qi, Shen Wenjie, Cao Chao, Lai Peng, Liao Zhengkai, Xian Bao'an, Bi Yansen
Coal Geology & Exploration
Objective and Methods Coalbed methane (CBM) horizontal wells face challenges such as sand accumulation in completion strings, pipe wall scaling, and pump sticking, leading to declined CBM production or shutdown of these wells. This severely restricts continuous, stable CBM production. Removing pulverized coals and sands from wellbores through mechanical sand bailing is recognized as an effective technique to restore and improve the CBM production of horizontal wells. To address challenges such as poor string sealing performance, low efficiency, and sand consolidation in mechanical sand bailing, this study created optimized tools including claw-shaped scraper tips, sand-breaking drill bits, eccentric flaps, and …
Reservoir Storage In Mid-March: Where Do We Stand?, Jack Schmidt, John Fleck, Kathryn Sorensen, Eric Kuhn, Katherine Tara
Reservoir Storage In Mid-March: Where Do We Stand?, Jack Schmidt, John Fleck, Kathryn Sorensen, Eric Kuhn, Katherine Tara
The Traveling Wilburys of the Colorado River
No abstract provided.
Impact Of Carbonate-Hosted Zn-Pb Ore Deposits On Groundwater Chemistry: Üzümcü-Olgunlar Mining Site (Hakkari, Türkiye), Ci̇han Tuncer, Yüksel Örgün Tutay, Muhterem Demiruğlu
Impact Of Carbonate-Hosted Zn-Pb Ore Deposits On Groundwater Chemistry: Üzümcü-Olgunlar Mining Site (Hakkari, Türkiye), Ci̇han Tuncer, Yüksel Örgün Tutay, Muhterem Demiruğlu
Turkish Journal of Earth Sciences
Hakkari, known for its high economic value Zn-Pb deposits in Türkiye, has been predominantly producing Zn ore for about 20 years. This study investigated the hydrogeochemical properties of groundwater and surface water collected from the vicinity of carbonate-oxide Zn-Pb mine sites in southern Hakkari to evaluate the effects of mineral deposits and mining activities on groundwater chemistry, as there are potential sources of natural pollution. Samples were collected four times at regular intervals during 2021–2022 from points determined upstream, downstream, and around the mine sites, springs, and streams. The samples were analyzed for majorions, trace elements, and isotopes (18O, 2H, …
Alternative Stones And Cleaning Efficiencies For Historical Building Stones Used In İstanbul (Türkiye), Ömer Ündül, Tuğçe Erözmen, Namik Aysal, Ahmet Güleç
Alternative Stones And Cleaning Efficiencies For Historical Building Stones Used In İstanbul (Türkiye), Ömer Ündül, Tuğçe Erözmen, Namik Aysal, Ahmet Güleç
Turkish Journal of Earth Sciences
Historical buildings are important part of the common heritage of mankind. İstanbul comprises many historical buildings built by geo-materials. A limestone (named as Küfeki stone in the region) is one of the most widely used stone in and around the city since thousands of years. The durability, excavability and workability of the stone attract the usage of this stone. Besides the outcrops of the rock were very common. Unfortunately, nowadays quarries and outcrops of Küfeki stone are totally abandoned due to dense settlement. For this reason, replacement of damaged or polluted stone with the original stone is a hard task …
Postseismic Groundwater Quality Investigation In Aquifers Following Earthquake-Induced Demolition Wastes: Hatay (Türkiye) Case Study, Pinar Avci, Gali̇p Yüce
Postseismic Groundwater Quality Investigation In Aquifers Following Earthquake-Induced Demolition Wastes: Hatay (Türkiye) Case Study, Pinar Avci, Gali̇p Yüce
Turkish Journal of Earth Sciences
The February 6, 2023 seismic sequence that hit, the Antakya district of Hatay (Türkiye), killed more than 50,000 people and caused extensive structural damages, resulting in the collapse of 80% of the building stock that generated over 100 million tons of debris. Understanding the impact of seismic events on water resources is highly important for ensuring human and environmental health. Herewith, a study was carried out over the Hatay area to assess the post-earthquake sustainable usability of groundwater for drinking, domestic, and irrigation purposes. 17 water points were investigated in September 2023, encompassing alluvial deposits with relatively high hydraulic conductivity …
A New Fossil Woody Flora Of The Late Oligocene-Early Miocene Of Northwest İstanbul With A New Species, Ünal Akkemi̇k, Burcu Üner
A New Fossil Woody Flora Of The Late Oligocene-Early Miocene Of Northwest İstanbul With A New Species, Ünal Akkemi̇k, Burcu Üner
Turkish Journal of Earth Sciences
The silicified wood samples identified in Kabakça (Çatalca) and its surroundings have been found in the west of İstanbul Province. They come from terrestrial clastic sediments of the Late Oligocene-Early Miocene İstanbul Formation. Six silicified wood samples were collected and sectioned in transverse, tangential, and radial planes. As a result, five angiosperm taxa were identified. Three out of six fossil wood samples belong to Lauraceae (Cryptocaryoxylon istanbulensis Akkemik and Üner sp. nov., Lau-rinoxylon ehrendorferi Berger, 1953), and the others to Fabaceae (Dichrostachyoxylon zirkelii (Felix) Müller-Stoll and Mädel 1967), Ulmaceae (Zelkovoxylon crystalliferum Akkemik 2021), and Fagaceae (Quercoxylon mixtum Petrescu 1978). This …
Facies And Depositional Architecture Of Upper Miocene Tidal Flat Sedimentation In Kefalonia And Corfu Islands, West Greece, Nicolina Bourli, Chrysanthos Botziolis, Penelope Papadopoulou, Panagiotis Zelilidis, Elena Zoumpouli, George Iliopoulos, Angelos G. Maravelis, Efthymios Trypsanas, Ioannis Oikonomopoulos, Aristotelis Pagoulatos, Avraam Zelilidis
Facies And Depositional Architecture Of Upper Miocene Tidal Flat Sedimentation In Kefalonia And Corfu Islands, West Greece, Nicolina Bourli, Chrysanthos Botziolis, Penelope Papadopoulou, Panagiotis Zelilidis, Elena Zoumpouli, George Iliopoulos, Angelos G. Maravelis, Efthymios Trypsanas, Ioannis Oikonomopoulos, Aristotelis Pagoulatos, Avraam Zelilidis
Turkish Journal of Earth Sciences
This research involves the integrated sedimentological and paleontological analysis of the Neogene tidal deposits in the eastern parts of the Hellenic Fold and Thrust Belt, in South Kefalonia (Paliolinos-Avithos coast) and in NW Corfu (Arillas coast) islands. The study of tidal is supported by illustrative outcrop photographs, with a particular emphasis on two synthetic outcrops. Sedimentary logs were generated to document detailed bed-by-bed measurements, descriptions, and identification of sedimentary structures. Additionally, over 75 samples were chosen for age determination and paleoenvironmental analysis. Micropaleontological analysis encompassed 52 samples from South Kefalonia and 23 samples from NW Corfu and the results point …
Northeast Anatolian Obsidians: Preliminary Results, Tülay Bak, Ufuk Celal Yağcioğlu, Cüneyt Şen, Fatma Şi̇şman Tükel
Northeast Anatolian Obsidians: Preliminary Results, Tülay Bak, Ufuk Celal Yağcioğlu, Cüneyt Şen, Fatma Şi̇şman Tükel
Turkish Journal of Earth Sciences
Obsidian, whose physical properties are suitable for making cutting tools, was one of the most basic commodities traded in prehistoric times. Obsidian, not found everywhere and with its unique chemical composition, is often used to create maps of prehistoric migration and trade routes. There are many important obsidian sources in Anatolia. These sources were utilised in the prehistoric period. One of the most important challenges facing archaeologists is identifying the source area of the raw materials used to create obsidian stone tools in prehistoric settlements. The geochemical properties of the obsidian from Northeastern Anatolia are less well known than those …
Designing A Cave Air Monitoring System: Guide And Feedback From 15 Years Of Monitoring The Cussac Cave (France), Nicolas Peyraube, Jessica D. Villanueva, Fabien Naessens, Roland Lastennet, Sylvain Mateo, Alain Denis
Designing A Cave Air Monitoring System: Guide And Feedback From 15 Years Of Monitoring The Cussac Cave (France), Nicolas Peyraube, Jessica D. Villanueva, Fabien Naessens, Roland Lastennet, Sylvain Mateo, Alain Denis
International Journal of Speleology
Understanding the cave’s ventilation system is important for determining how the cavity interacts with external airflow. This requires a well-designed monitoring system. This article addresses these key aspects: how to build a monitoring system for cave air parameters and how to assess the ventilation of a cave. We proposed a flowchart to help address the issues in: 1) the modularity of a monitoring system, 2) the use of “homemade device” or “ready to use device”, 3) the frequency of measure and its effect on the electrical consumption, 4) the duration of the survey, and 5) the accessibility of the recorded …
The Few-Nexus: Using Soil To Grow Meaning And Relevance In Undergraduate General Education Earth Science Courses, Katherine Mccarville
The Few-Nexus: Using Soil To Grow Meaning And Relevance In Undergraduate General Education Earth Science Courses, Katherine Mccarville
National Collaborative for Research on Food, Energy, and Water Education (NC-FEW)
Soils are central to human survival, through their critical roles in regulating water supplies and providing the medium for most agricultural productivity. Even as fewer and fewer students know where their water and food come from, and where their wastes go, soils tend to be under-emphasized in Earth science general education courses. Combining a place-based focus on soils with the FEW-Nexus model provides an integrating context for concepts and information that students sometimes perceive as disconnected and irrelevant to them. This approach can transform the experiences and learning of undergraduate students in the Earth science general education curriculum.
Refugium Amidst Ruins: Unearthing The Lost Flora That Escaped The End-Permian Mass Extinction, Huiping Peng, Wan Yang, Mingli Wan, Jun Liu, Feng Liu
Refugium Amidst Ruins: Unearthing The Lost Flora That Escaped The End-Permian Mass Extinction, Huiping Peng, Wan Yang, Mingli Wan, Jun Liu, Feng Liu
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
Searching for land refugia becomes imperative for human survival during the hypothetical sixth mass extinction. Studying past comparable crises can offer insights, but there is no fossil evidence of diverse megafloral ecosystems surviving the largest Phanerozoic biodiversity crisis. Here, we investigated palynomorphs, plant, and tetrapod fossils from the Permian-Triassic South Taodonggou Section in Xinjiang, China. Our fossil records, calibrated by a high-resolution age model, reveal the presence of vibrant regional gymnospermous forests and fern fields, while marine organisms experienced mass extinction. This refugial vegetation was crucial for nourishing the substantial influx of surviving animals, thereby establishing a diverse terrestrial ecosystem …