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Earth Sciences

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2023

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Articles 421 - 443 of 443

Full-Text Articles in Physical Sciences and Mathematics

Calcareous Nannofossils, Planktonic Foraminifera, And Revised Stratigraphy Of The Eocene Çayraz Formation; The Final Stage Of Marine Sedimentation In Central Anatolia, Turkey, Ali̇ Osman Yücel, Ercan Özcan, Rita Catanzariti, Aynur Hakyemez, Aral Okay, Tahsi̇n Atti̇la Çi̇ner, Ali̇ Akin Jan 2023

Calcareous Nannofossils, Planktonic Foraminifera, And Revised Stratigraphy Of The Eocene Çayraz Formation; The Final Stage Of Marine Sedimentation In Central Anatolia, Turkey, Ali̇ Osman Yücel, Ercan Özcan, Rita Catanzariti, Aynur Hakyemez, Aral Okay, Tahsi̇n Atti̇la Çi̇ner, Ali̇ Akin

Turkish Journal of Earth Sciences

New field observations and discovery of calcareous nannofossils and planktonic foraminifera from the 'shallow-marine' Çayraz Formation (Haymana Basin, Central Anatolia), a contributing Eocene section to the shallow benthic zonation (SBZ) in the Tethys, allow us to revise its stratigraphy and establish an integrated biostratigraphic scheme for the first time. The hemipelagic marls in the uppermost part of the Eskipolatlı Formation that underlies the Çayraz Formation yielded nannofossil assemblages of Zone CNE3, pinning down the initiation of the Çayraz shelf system into the 'middle' Ypresian. The prominent marly part (Member B) between the carbonate-clastic packages of the Çayraz Formation with prolific …

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Evidence For Surface Rupture Of The 1939 Erzincan Earthquake Based On Field Data And Paleoseismology On The Ezinepazarı Fault (North Anatolian Fault Zone, Central Anatolia), Fi̇kret Koçbulut Jan 2023

Evidence For Surface Rupture Of The 1939 Erzincan Earthquake Based On Field Data And Paleoseismology On The Ezinepazarı Fault (North Anatolian Fault Zone, Central Anatolia), Fi̇kret Koçbulut

Turkish Journal of Earth Sciences

The Ezinepazarı Fault (EPF) is an active segment that restricts the Niksar Basin in the central part of the North Anatolian Fault Zone and has been the source of the devastating Mw 8.0 earthquake in the last 100 years. Traces of the surface rupture of the EPF, which occurred in AD 1939, can still be observed in the field today as a right-lateral strike-slip character. While paleoseismological studies were mostly focused on the western part of the North Anatolian Fault Zone (NAFZ) in previous studies, the studies on the central and eastern parts of the NAFZ are rarely addressed. In …

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Petrological Characteristics Of Gabbroic Intrusions In Southeastern Urmia-Dokhtar Magmatic Belt, Kerman Province, Iran: Evidence For Post-Eocene Mafic Magmatism, Zahra Najafi, Hamid Ahmadipour, Abbas Moradian, Fatemeh Sarjoughian, Kazuo Nakashima Jan 2023

Petrological Characteristics Of Gabbroic Intrusions In Southeastern Urmia-Dokhtar Magmatic Belt, Kerman Province, Iran: Evidence For Post-Eocene Mafic Magmatism, Zahra Najafi, Hamid Ahmadipour, Abbas Moradian, Fatemeh Sarjoughian, Kazuo Nakashima

Turkish Journal of Earth Sciences

At the south of the Bardsir, Kerman province, Iran, the southeastern part of the Urmia-Dokhtar magmatic arc (UDMA), a large number of gabbroic intrusions are intruded into the Eocene lava flows and pyroclastic rocks with the form of small stocks and dykes. In this paper, geochemical variations, magmatic evolutions, and the origin of these intrusions are investigated. The studied intrusions are characterized by fine-grained margins resulting from rapid cooling and flow differentiation. They display porphyritic texture and include coarse-grained clinopyroxene with diopside compositions (Wo = 46.89, En = 40.78, Fs = 12.32), plagioclase with labradorite composition (An = 54.14), and …

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Hydrogeochemical Pattern And Environmental Isotope Hydrology Of Coastal Bademli Geothermal Area (Bga) In Western Turkey (Dikili-İzmir): A New Geothermal Prospect, Adi̇le Meli̇s Somay Altaş, Ünsal Gemi̇ci̇ Jan 2023

Hydrogeochemical Pattern And Environmental Isotope Hydrology Of Coastal Bademli Geothermal Area (Bga) In Western Turkey (Dikili-İzmir): A New Geothermal Prospect, Adi̇le Meli̇s Somay Altaş, Ünsal Gemi̇ci̇

Turkish Journal of Earth Sciences

Bademli geothermal area (BGA) is located on the coastline of Dikili-İzmir province and consists of Bademli spring and Hayıtlı areas with 36.8-51°C discharge temperatures, respectively. The waters of Hayıtlı borehole have remarkable seawater mixing ratios like Bademli spring and have Na-Cl water type. Dikili group pyroclastic volcanic units constitute the reservoir rock in the entire geothermal area. The heat source is relatively elevated geothermal gradient caused by extensional tectonics forming E-W trending grabens. Bademli thermal water is plotted in the "immature waters" area in the Na-K-Mg triangular diagram with a calculated seawater contribution of 18%. Therefore, some cation geothermometers are …

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Identification Of Transtensional And Transpressional Features In The Sea Of Marmara Using Onshore-Offshore Seismic And Geodetic Data, Zeynep Coşkun, Ali̇ Pinar Jan 2023

Identification Of Transtensional And Transpressional Features In The Sea Of Marmara Using Onshore-Offshore Seismic And Geodetic Data, Zeynep Coşkun, Ali̇ Pinar

Turkish Journal of Earth Sciences

The scope of the study is to determine transtensional and transpressional features along the North Anatolian Fault beneath the Sea of Marmara, using seismic and geodetic data. For this purpose, focal mechanisms of small size NAF earthquakes, recorded by broadband stations and OBSs, have been derived and used as a tool to identify the transtensional and transpressional features. The focal mechanisms of: (1) small to moderate size events are obtained by the CMT inversion technique of Kuge (2003), using onshore waveform data from 2002?2015, (2) micro-earthquakes are obtained using the technique of Horiuchi (2015), using offshore waveform data recorded by …

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Foraminiferal Micropaleontology Of The Harami Formation (Elazığ, Eastern Turkey), And Reassessment Of Its Age Based On Larger Benthic Foraminifera, Si̇bel Kayğili Jan 2023

Foraminiferal Micropaleontology Of The Harami Formation (Elazığ, Eastern Turkey), And Reassessment Of Its Age Based On Larger Benthic Foraminifera, Si̇bel Kayğili

Turkish Journal of Earth Sciences

The age and depositional environment of the Harami Formation were reevaluated based on the new larger benthic foraminiferal (LBF) data. LBF assemblage including Orbitoides medius (d'Archiac), O. megaloformis Papp and Küpper, O. gruenbachensis Papp, Pseudomphalocyclus blumenthali Meriç, Omphalocyclus macroporus (Lamarck), Sirtina cf. orbitoidiformis Brönnimann and Wirz, Hellenocyclina beotica Reichel, Lepidorbitoides campaniensis Van Gorsel, L. bisambergensis (Jaeger), L. cf. minor (Schlumberger), Pseudosiderolites vidali (Douville), and Siderolites gr. calcitrapoides Lamarck were determined in the formation. Based on this LBF assemblage data, the late Campanian-Maastrichtian age was assigned to the formation. The paleontological and sedimentological data indicate that the Harami Formation was deposited …

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Multiphase Deformation, Fluid Flow And Mineralization In Epithermal Systems: Inferences From Structures, Vein Textures And Breccias Of The Kestanelik Epithermal Au-Ag Deposit, Nw Turkey, Ni̇lay Gülyüz, Zoe Kai̇ Shipton, İlkay Kuşcu Jan 2023

Multiphase Deformation, Fluid Flow And Mineralization In Epithermal Systems: Inferences From Structures, Vein Textures And Breccias Of The Kestanelik Epithermal Au-Ag Deposit, Nw Turkey, Ni̇lay Gülyüz, Zoe Kai̇ Shipton, İlkay Kuşcu

Turkish Journal of Earth Sciences

We investigate the multiphase deformation, fluid flow, and mineralization processes in epithermal systems by presenting a detailed study of vein textures and breccias of the Kestanelik epithermal Au-Ag deposit, NW Turkey. The mineralization in the deposit is associated with several quartz veins. Fault-hosted veins and mode I veins share many textural and breccia characteristics owing to (i) overprinting of tectonic breccias formed during coseismic rupturing by subsequent coseismic hydrothermal brecciation and (ii) reworking of earlier vein breccia phases by repeated rupturing and hydraulic fracturing events. The spatial distribution of breccias at fault-hosted veins proposes that power of coseismic hydrothermal brecciation …

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Relationship Of Petrographic And Mineralogical Characteristics With Mechanical Strength Properties Of Granitic Rocks: A Case Study From The Biga Peninsula, Nw Turkey, Güven Eroğlu, Ayten Çalik Jan 2023

Relationship Of Petrographic And Mineralogical Characteristics With Mechanical Strength Properties Of Granitic Rocks: A Case Study From The Biga Peninsula, Nw Turkey, Güven Eroğlu, Ayten Çalik

Turkish Journal of Earth Sciences

This study was carried out on granitic rocks from the Biga Peninsula in order to investigate petrographic, and mineralogical properties in comparison with mechanical strength properties. This study was conducted in four different locations where granitic rocks outcrop from north to south in the Biga Peninsula: Lapseki (Şevketiye granite), Ezine (Kestanbol granite), Bayramiç (Yassıbağ granite), and Edremit (Eybek granite). Field observations and detailed petrographic studies of representative samples indicate that they are quartz monzodiorite (Şevketiye and Yassıbağ), quartz monzonite (Kestanbol), and granodiorite (Eybek) in composition. All the rocks have similar mineral composition, comprising mainly feldspar (plagioclase-alkali feldspar), quartz, mafic minerals …

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Geology Of The Eastern Anatolian Plateau (Turkey): A Synthesis, Ali̇ Yilmaz, Gülteki̇n Topuz, Tuna Eken, Osman Candan, Hüseyi̇n Yilmaz Jan 2023

Geology Of The Eastern Anatolian Plateau (Turkey): A Synthesis, Ali̇ Yilmaz, Gülteki̇n Topuz, Tuna Eken, Osman Candan, Hüseyi̇n Yilmaz

Turkish Journal of Earth Sciences

The Eastern Anatolian Plateau (EAP), approximately 2000 m above sea level, is located between the Eastern Pontides to the north, the Arabian Platform to the south, and the Iranian Plateau to the east. It is characterized by approximately 6 km-thick Maastrichtian to Quaternary volcano-sedimentary cover which unconformably overlies continental and oceanic basement units. Overall, the outcrops of the pre-Maastrichtian basement are rare and include both continental and oceanic units. This led to drastically different interpretations of the nature of the pre-Maastrichtian basement as (i) the oceanic accretionary complex or (ii) continental crust and overlying ophiolitic mélange. This synthesis deals with …

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New Triassic Finding In Andız Peninsula (İzmir, Western Turkey) And Comparison Of Pre-Neogene Sequences Of Andız And Karaburun Peninsulas: Stratigraphic And Tectonic Implications, İsmai̇l İşi̇ntek Jan 2023

New Triassic Finding In Andız Peninsula (İzmir, Western Turkey) And Comparison Of Pre-Neogene Sequences Of Andız And Karaburun Peninsulas: Stratigraphic And Tectonic Implications, İsmai̇l İşi̇ntek

Turkish Journal of Earth Sciences

This study aims to review the geology of the Andız Peninsula and compare the pre-Neogene Andız succession with the middle part of the Karaburun Peninsula to discuss the nature of the Paleozoic-Mesozoic boundary in the Karaburun Peninsula. The pre-Neogene units of the Andız Peninsula are represented by the Paleozoic Dikendağı, Triassic Gu?vercinlik, and Jurassic Nohutalan Formations. In this study, the Triassic carbonate rocks in the Andız Peninsula are paleontologically defined for the first time. The Megalodont-bearing Gu?vercinlik Formation contains a late Norian-Rhaetian characteristic foraminiferal assemblage consisting of Aulotortus gr. sinuosus, A. tenuis, A. friedli, A. impressus, and Triasina hantkeni. The …

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Update For Reactive Transport Modeling Of The Kızıldere Geothermal Field To Reduce Uncertainties In The Early Inspections, Selçuk Erol, Taylan Akin, Serhat Akin Jan 2023

Update For Reactive Transport Modeling Of The Kızıldere Geothermal Field To Reduce Uncertainties In The Early Inspections, Selçuk Erol, Taylan Akin, Serhat Akin

Turkish Journal of Earth Sciences

The development of carbon capture and storage techniques has become essential to reduce and mitigating CO2 emissions to the atmosphere. CarbFix1 and CarbFix2 projects carried out in Iceland demonstrated that the emissions of waste CO2 gas from geothermal power plants can be captured and mixed with the effluent geofluid and subsequently injected back into the geothermal reservoir. This experience gained in the CarbFix projects expanded into other geothermal fields around Europe, and one of the demonstration sites is the geothermal field in Turkey, Kızıldere. This paper focuses on the results of an updated study on early field evaluations with reactive …

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Fired Shards From Selected Ancient Anatolian Ceramics: A Brief Review Of Their Mineralogical Nature And Pedological?Microstructural Evolution, Seli̇m Kapur, Selahatti̇n Kadi̇r, Gilbert Kelling, Erhan Akça, Mustafa Topaksu, Necdet Sakarya, Zehra Yeği̇ngi̇l, Muhsi̇n Eren, Ewart Adsil Fitzpatrick Jan 2023

Fired Shards From Selected Ancient Anatolian Ceramics: A Brief Review Of Their Mineralogical Nature And Pedological?Microstructural Evolution, Seli̇m Kapur, Selahatti̇n Kadi̇r, Gilbert Kelling, Erhan Akça, Mustafa Topaksu, Necdet Sakarya, Zehra Yeği̇ngi̇l, Muhsi̇n Eren, Ewart Adsil Fitzpatrick

Turkish Journal of Earth Sciences

This review is concerned with some key features observed within grouped samples of ancient ceramics that provide important evidence concerning the selection of appropriate raw materials and the evolution of the firing technologies employed in their production. It also demonstrates the importance of distinguishing and accounting for the mineralogical and microstructural attributes and identifying the processes responsible for the microstructural evolution of these ancient ceramics. The mineralogy largely reflects both the nature of the raw materials used and the maximum temperatures achieved during firing, deduced from the presence of specific high temperature minerals (HTMs). The microstructural evolution processes, deduced by …

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Early Pliocene Arvicolinae And Cricetinae From The Locality Of Afşar, Western Turkey, Panagiotis Skandalos, Koen Lansing, Fatma Arzu Demi̇rel, Mehmet Ci̇hat Alçi̇çek, Serdar Mayda, Francien Dieleman, Lars W. Van Den Hoek Ostende Jan 2023

Early Pliocene Arvicolinae And Cricetinae From The Locality Of Afşar, Western Turkey, Panagiotis Skandalos, Koen Lansing, Fatma Arzu Demi̇rel, Mehmet Ci̇hat Alçi̇çek, Serdar Mayda, Francien Dieleman, Lars W. Van Den Hoek Ostende

Turkish Journal of Earth Sciences

The Afşar section, situated in the Dombayova graben in western Turkey, is one of the key localities for the study of the Pliocene of Anatolia. Two fossiliferous layers yielded micromammal assemblages, including various cricetine and arvicoline species. These include the species Mimomys cf. gracilis, Pliomys sp., Arvicolinae gen. sp. and the cricetines Cricetulus cf. ehiki and Cricetulus sp. in Afşar 1 and Mimomys hassiacus, M. gracilis, Pliomys graecus and Mesocricetus primitivus in Afşar 2. The cooccurence of these species indicates a dry and open spaced habitat. Based on the composition and stage of evolution of the hamster and vole species, …

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Pithonellid Calcitarch Record In The Middle? Cenomanian Derdere-A Member, Se Turkey: Palaeoenvironmental Changes And Stratigraphic Significance, Oğuz Mülayi̇m, İsmai̇l Ömer Yilmaz, Bruno Ferré Jan 2023

Pithonellid Calcitarch Record In The Middle? Cenomanian Derdere-A Member, Se Turkey: Palaeoenvironmental Changes And Stratigraphic Significance, Oğuz Mülayi̇m, İsmai̇l Ömer Yilmaz, Bruno Ferré

Turkish Journal of Earth Sciences

Pithonellid calcitarchs are studied in the organic-rich limestones of the Derdere-A Member from the middle? Cenomanian deposits of SE Turkey for the first time. Little is known about the distribution of pithonellid calcitarchs in the Cretaceous strata of Turkey. Three morphogroups of pithonellid calcitarchs are distinguished: they are represented by Pithonella sphaerica (Kaufmann, 1865) and P. ovalis (Kaufmann, 1865), both dominating the pithonellid assemblages, and by Bonetocardiella conoidea (Bonet, 1956), this latter being less abundant. Compared to the relative abundance of Upper Cretaceous pithonellid calcitarchs in the study area, the diversity is extremely low. The significant increase in abundance of …

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Geoelectric Evaluation Of Soil Foundation Utilizing Electrical Resistivity Tomography At West Gulf Of Suez, Al-Ain Al Sokhna, Egypt, Mahmoud Zayed Jan 2023

Geoelectric Evaluation Of Soil Foundation Utilizing Electrical Resistivity Tomography At West Gulf Of Suez, Al-Ain Al Sokhna, Egypt, Mahmoud Zayed

Al-Azhar Bulletin of Science

To evaluate the subsurface layers and geological structures for construction in one of the tourist areas in Egypt, the geoelectrical survey was used, represented by the 2D Electrical Resistivity Tomography (ERT). The geoelectrical survey includes 16 ERT profiles that have been conducted by using the Winner electrode array with twenty electrodes connected to a multi-core cable. The electrode spacing (a) varies between 4 and 6 meters to investigate a depth of around twenty meters, and the length of the ERT profiles varies from 76 to 114 meters depending on the electrode spacing difference and the field's available space. Through the …

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The Surprising Oceanography Of The Gulf Of Maine, Nicholas R. Record, Benjamin Tupper, Johnathan Evanilla, Kyle Oliveira, Camille Ross, Logan Ngai, Karen Stamieszkin Jan 2023

The Surprising Oceanography Of The Gulf Of Maine, Nicholas R. Record, Benjamin Tupper, Johnathan Evanilla, Kyle Oliveira, Camille Ross, Logan Ngai, Karen Stamieszkin

Maine Policy Review

The oceanography of the Gulf of Maine has changed in ways that have not been seen previously but that are likely to be more common in the future–changes like extreme rapid warming and declines in primary productivity. The changing oceanography has underpinned surprising losses in commercial stocks and endangered species. Because of the rapid rate of change, some have viewed the Gulf of Maine as a window into the ocean’s future, with the idea that lessons learned can be applied in places that have yet to experience similar rapid changes. We can examine the dynamics, origin, and implications of surprising …

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Evaluation Of Recent Earthquake Activity Along The Ganos Fault: Mongan Network Test Analysis, Eşref Yalçinkaya, Marco Bohnhoff, Ethem Görgün, Hakan Alp, Stephan Bentz, Ali Pinar, Fatih Alver, Ömer Kiliçarslan, Burçin Didem Tamtaş, Burçak Görgün Jan 2023

Evaluation Of Recent Earthquake Activity Along The Ganos Fault: Mongan Network Test Analysis, Eşref Yalçinkaya, Marco Bohnhoff, Ethem Görgün, Hakan Alp, Stephan Bentz, Ali Pinar, Fatih Alver, Ömer Kiliçarslan, Burçin Didem Tamtaş, Burçak Görgün

Bulletin of the Mineral Research and Exploration

The Monitoring of the Ganos Fault data presents significant opportunities and challenges for earthquake detection, location and magnitude calculations, source mechanism solutions, and discovery of fault zone waves. This study indicates mostly of preliminary data analysis and seismological evaluations. While narrow distance aperture installation has an opportunity to detect microearthquakes, it also causes significant difficulties in determining the source parameters of micro-earthquakes. Extracting microearthquakes from continuous data shows that special strategies need to be used. MONGAN data revealed the presence of many earthquakes with magnitude M<1.0 in the study region. These earthquakes are mostly out of network earthquakes and it is very difficult to obtain reliable solutions due to the insufficient azimuthal distribution of the stations. It is obvious that different network techniques and wave particle motion analyzes are contributed to the location and source parameters. Although the fault zone structure consists of two different lithologies that make significant differences in seismic wave phase arrival times and wave amplitudes, we observe fault zone head waves on both sides along the Ganos fault. Moment tensor analyzes depict that reliable source mechanism solutions can be obtained using a small number of station records.

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Neotectonic And Topographic Evolution Of The Bitlis-Zagros Fold-Thrust Belt, Se Turkey, Hali̇l Zorer, Yahya Öztürk, Azad Sağlam Selçuk Jan 2023

Neotectonic And Topographic Evolution Of The Bitlis-Zagros Fold-Thrust Belt, Se Turkey, Hali̇l Zorer, Yahya Öztürk, Azad Sağlam Selçuk

Turkish Journal of Earth Sciences

The Bitlis-Zagros Fold-Thrust Belt is one of the world?s largest deformation zones, extending from the Eastern Mediterranean in southern Turkey to in the south of Iran. This deformation zone is partitioned between different structures; however, little is known about the relative activities of these different structures and their effects on topography. An area located in the northern part of Bitlis- Zagros Fold-Thrust Belt, just south of the Eastern Anatolian Plateau was studied in detail to analyze the effect of active tectonism on topographic development. The effects of active deformation structures such as Hakkâri and Şirvan Fault Segments on the topographic …

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Micropaleontological Findings And Absolute Ages Mark The Termination Of The Last Glacial Maximum In The Eastern Mediterranean Region: New Electron Spin Resonance Data From Gediz Delta (Western Turkey), Eki̇n Gökçe Benli̇, Hülya Aslin, İsmai̇l İşi̇ntek, Bi̇rol Engi̇n, Berna Şengöçmen Geçki̇n Jan 2023

Micropaleontological Findings And Absolute Ages Mark The Termination Of The Last Glacial Maximum In The Eastern Mediterranean Region: New Electron Spin Resonance Data From Gediz Delta (Western Turkey), Eki̇n Gökçe Benli̇, Hülya Aslin, İsmai̇l İşi̇ntek, Bi̇rol Engi̇n, Berna Şengöçmen Geçki̇n

Turkish Journal of Earth Sciences

Sediments and fossil content of Gediz Delta (Eastern Aegean Sea-İzmir) were examined from the samples collected from three drilling cores from the west (seaward) to east (landward) of the delta. Each drilling core contains Quarternary marine deposits with a marine fauna of foraminifers, bivalves, gastropods, echinoids, and ostracods at the bottom and Quaternary continental delta deposits at the top. According to our Electron Spin Resonance (ESR) age model marine sediments of the Aegean Sea started to cover the western Gediz Delta area before 19.9 ka (thousand years). Following the Last Glacial Maximum (LGM), after the transgression due to deglaciation occurred …

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Accuracy Assessment Of The Ebee Using Rtk And Ppk Corrections Methods As A Function Of Distance To A Gnss Base Station, Joseph Cerreta, David Thirtyacre, Peter Miller, Scott S. Burgess, William J. Austin Jan 2023

Accuracy Assessment Of The Ebee Using Rtk And Ppk Corrections Methods As A Function Of Distance To A Gnss Base Station, Joseph Cerreta, David Thirtyacre, Peter Miller, Scott S. Burgess, William J. Austin

International Journal of Aviation, Aeronautics, and Aerospace

The use of unmanned aircraft systems to collect data for photogrammetry models has grown significantly in recent years. The accuracy of a photogrammetric model can depend on image georeferencing. The distance from a reference base station can affect the accuracy of the results. Positioning corrections data relies on precise timing measurements of satellite signals. The signals travel through the Earth's atmosphere, which introduces errors due to ionospheric and tropospheric delays. The aim of this research was to examine the eBee X and its global GNSS accuracy by comparing the RTK and PPK methods at different base station distances in photogrammetry …

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Petrology, Geochemistry And Mineralogy Of Alaskan Type Ultramafic-Mafic Intrusive Complexes: A Case Study Around Mikbi-Zayatit District, South Eastern Desert, Egypt, Omar A. Soliman, Hatem M. El-Desoky, Mahmoud M. El-Rahmany, Hamada M. El-Awny Jan 2023

Petrology, Geochemistry And Mineralogy Of Alaskan Type Ultramafic-Mafic Intrusive Complexes: A Case Study Around Mikbi-Zayatit District, South Eastern Desert, Egypt, Omar A. Soliman, Hatem M. El-Desoky, Mahmoud M. El-Rahmany, Hamada M. El-Awny

Al-Azhar Bulletin of Science

The present work deals with the field geology, petrography, geochemistry and mineralogy of Wadi Zayatit and Wadi Mikbi ultramafic-mafic intrusive complex, South Eastern Desert, Egypt. Based on the current geological maps, field observations, structural relationships, and previous works; the rocks that exposed in the study regions are dunites, peridotites, and gabbro. These rocks characterized by coarse-grained, dark greyish to whitish grey color, massive with lustric features and slightly deformed with low to moderate relief. The commonest of the accessory constituents is an oxide ore mineral of some kinds, the most frequent one is chromite, ilmenite, titano-magnetite and magnesio-ferrite. The petrographic …

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A Miocene Nannofossil Biostratigraphic Case Study: Alaminos Canyon Block 627 And Mississippi Canyon Block 555, And Sedimentation Rates In The Gulf Of Mexico, Bethany L. Cobb Faulk, Murlene W. Clark Jan 2023

A Miocene Nannofossil Biostratigraphic Case Study: Alaminos Canyon Block 627 And Mississippi Canyon Block 555, And Sedimentation Rates In The Gulf Of Mexico, Bethany L. Cobb Faulk, Murlene W. Clark

Gulf and Caribbean Research

The Miocene sediments of 2 deep—water boreholes from the northern Gulf of Mexico, from Alaminos Canyon (AC) Block 627 and Mississippi Canyon (MC) Block 555, have been biostratigraphically analyzed using calcareous nannofossils, revealing changes in sedimentation rates and depositional environments between these 2 areas. High nannofossil abundance values and low sedimentation rates generally recorded in the Alaminos Canyon region suggest a condensed section during much of the Miocene, associated with a basinal environment. Mississippi Canyon exhibits lower nannofossil abundance and higher sedimentation rates compared to Alaminos Canyon during the majority of the Miocene. Increased sediment volumes are largely attributed to …

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Epiphytic Diatom Production On The Seagrass Thalassia Testudinum In Northern Gulf Of Mexico, Jonathan L. Venable, Shayna A. Sura, Jeffrey W. Krause Jan 2023

Epiphytic Diatom Production On The Seagrass Thalassia Testudinum In Northern Gulf Of Mexico, Jonathan L. Venable, Shayna A. Sura, Jeffrey W. Krause

Gulf and Caribbean Research

No abstract provided.

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