Physical Sciences and Mathematics Commons^™

Geology, Geochemistry And Geotectonic Setting Of Volcanics Comprising Küre (Kastamonu) Ore Mineralization, Şükrü Koç, Ahmet Ünsal, Yusuf Kağan Kadioğlu

Bulletin of the Mineral Research and Exploration

No abstract provided.

Late Triassic (Carnian) Unconformity In A Block Of The Latest Cretaceous Volcanic Olistostrome Unit In The Izmir-Ankara Zone, Orhan Kaya, Walid Sadeddin, Demir Altiner, Güssun Akay

Bulletin of the Mineral Research and Exploration

No abstract provided.

Stratigraphic And Structural Setting Of The Anchimetamorphic Rocks To The South Of Tavşanli (Kütahya, Western Turkey): Relation To The İzmi̇r-Ankara Zone, Orhan Kaya, Walid Sadeddin, Demir Altiner, Engin Meri̇ç, İzver Tansel, Aylin Vural

Bulletin of the Mineral Research and Exploration

No abstract provided.

Geological Characteristics Of The Aşiköy-Toykondu (Küre-Kastamonu) Massive Sulfide Deposits, Üner Çakir

Bulletin of the Mineral Research and Exploration

No abstract provided.

Features Of The Tertiary Volcanizm Observed At Bi̇ga Peninsula And Gökçeada, Tavşan Islands, Tuncay Ercan, Muharrem Satir, Gideon Steinitz, Ayşin Dora, Ender Sarifakioğlu, Christoph Adls, Hans-Jürgen Walter, Talat Yildirim

Bulletin of the Mineral Research and Exploration

No abstract provided.

Micro-Textural Features Of The Sandstones In The Üzümdere Formation (North Of Akseki̇, Antalya), Turhan Ayyildiz, Erdoğan Teki̇n, Nurettin Sonel, Mehmet Bülbül

Bulletin of the Mineral Research and Exploration

No abstract provided.

New Petrographical Data At The Eastern Part Of Alanya Metamorphites (Anamur, S.Turkey), Veysel Işik, Okan Tekeli̇

Bulletin of the Mineral Research and Exploration

No abstract provided.

Geology Of The Akdağ Massif And Surroundings, Ali Yilmaz, Şükrü Uysal, Yavuz Bedl, Halil Yusufoğlu, Talat Havzoğlu, Ahmet Ağan, Deniz Göç, Nihal Aydin

Bulletin of the Mineral Research and Exploration

No abstract provided.

Features And Origin Of The Koçkale-Elaziğ Manganese Mineralizations, Mehmet Altunbey, Ahmet Sağiroğlu

Bulletin of the Mineral Research and Exploration

Koçkale and its vicinity (Elazığ) is composed of four different units. These are; Upper Jurassic-Lower Cretaceous Guleman Group, Campanian-Maastrichtian Yüksekova Complex, Maastrichtian-Lower Eocene Hazar Group and Middle Eocene Maden Complex. The Mn mineralizations of Koçkale are situated in volcanosedmentary rocks of Maden Complex and occur in two types: (1) The mineralizations conformable with volcanosedimentary rocks, are the syngenetic and volcanosedimentary type. This type of mineralizations occur within mudstone and as a constituent of this unit, The mineralized bodies are tense and stratiform shaped. Any alteration related to mineralization is absent. Ore mineral assemblage is pyrolusite, psilomelane, rodokrosite, brauntte, manganite, limonite, …

Tertiary Mollusk Fauna And Stratigraphy Of Pinarhi̇sar (Kirklareli̇) Area, Yeşim İslamoğlu, Güler Taner

Bulletin of the Mineral Research and Exploration

No abstract provided.

Depositional Conditions Of Pleistocene Alluvial Fan Deposites In The Güzelyurt Basin (Turkish Republic Of The Northern Cyprus), Engin Olgun

Bulletin of the Mineral Research and Exploration

No abstract provided.

Petrography And Origin Of Dolomites Of Yaniktepe Formation (Upper Cretaceous) In Gürün Autochthonous, Eastern Taurus Turkey, Eşref Atabey

Bulletin of the Mineral Research and Exploration

No abstract provided.

Genesis Of The Di̇vri̇ği̇ Iron Ore Deposit, Si̇vas, Central Anatolia, Turkey-An Ore Microscopy Study, Taner Ünlü, Henrik Stendal, Emil Makovicky, İ. Sönmez Sayili

Bulletin of the Mineral Research and Exploration

No abstract provided.

Making Horticulture Sustainable, Bob Paulin, Neil Clifton Lantzke, Ian Mcpharlin, Murray Hegney

Journal of the Department of Agriculture, Western Australia, Series 4

Sweet crunchy carrots, luscious strawberries at very reasonable prices, crisp green vegetables - these are just a few of the horticultural products that Western Australians take for granted and eat almost every day. But is their future availability guaranteed as population grows, suburbia spreads and environmental concern increases?

Cooperative Landcare Venture Revisited, Kate Mcinnes

Journal of the Department of Agriculture, Western Australia, Series 4

Four years ago, the Journal of Agriculture reported on a unique partnership forged in 1989 between the Department of Agriculture Alcoa of Australia Limited and six catchment groups located in the Avon River catchment.

Kate McInnes reports on progress with the Avon Catchment Landcare Project.

Storm : [Wind Erosion In The Great Southern], Dan Carter

Journal of the Department of Agriculture, Western Australia, Series 4

On Thursday 11 May 1995, a low pressure system with central barometric pressure of 990 hPa formed of south-western Australia. This depression directed gale force winds over the South-West Land Division for some seven hours.

Dan Carter reports on the widespread damage to soils and property, and management practices that would have reduced the problem.

Biological Processes: Relationships Between Earthworms And Soil Temperature, Edwin C. Berry, Jerry K. Radke

Journal of the Minnesota Academy of Science

Soil fauna play important roles in many soil processes and conditions which relate to agricultural systems. Earthworms are credited with enhancing soil fertility and soil physical properties by their feeding and burrowing activities. Most research on earthworms has focused on the warmer seasons of the year and relatively little is known about earthworm activity and survival during the portion of the year with frozen soils. Earthworms may survive winter by acclimatization, aestivation, or by burrowing to deeper depths where the soil is not frozen. More research is needed on the fate of earthworms in frozen soils. Suggested research areas include: …

Freezing And Thawing Of Agricultural Soils: Implications For Soil, Water, And Air Quality, Brenton S. Sharratt, Keith E. Saxton, Jerry K. Radke

Journal of the Minnesota Academy of Science

Most agricultural lands in the USA are subject to subfreezing temperatures. Soil freezing and thawing affects both biotic and abiotic interactions and processes which vary with weather, soil type, land management, and topography. Soil fauna generally undergo physiological changes or rely on locomotion as a means of adapting to frozen soils. Managing faunal populations using soil management may be achievable with a better understanding of winter ecological processes. Many of the thermal, hydraulic, mechanical, and physical properties of soils are altered by freezing and thawing. Soil erosion may be accentuated by soil freezing and thawing as a result of changes …

Migration Of Water During Winter In West Central Minnesota Soils, Brenton S. Sharratt

Journal of the Minnesota Academy of Science

Soil freezing influences the amount and quality of our water resources, yet, little is known concerning the impacts of soil texture and water content before freezing on water migration in frozen soils. Columns of Hamerly clay loam and Sioux loam at 3 initial water contents were subjected to the vagaries of the field environment at Morris, Minnesota during the winter of 1993-1994 and then sectioned to determine changes in soil water content. Redistribution of water in the frozen soil layer became more apparent with an increase in initial water content. Little movement of water occurred at the lowest initial water …

Studies On Freezing And Thawing Soils In Iowa, Jerry K. Radke, Edwin C. Berry

Journal of the Minnesota Academy of Science

Frozen soils have a major influence on the cropping systems and farming practices in northern states. However, relatively little research has been done on the physical, chemical, and biological processes that occur in the field during the non-growing season. Experiments on frozen soils were started recently in Iowa to 1) study the effects of residue cover on soil freezing and thawing, 2) measure the movement of water and solutes and changes in soil structure due to freezing and thawing of repacked soil columns in the field, 3) test the SHAW (Simultaneous Heat And Water) model for its capability to predict …

Soil Freeze-Thaw Processes: Implications For Nutrient Cycling, C. Wayne Honeycutt

Journal of the Minnesota Academy of Science

Soil freeze-thaw processes can regulate nutrient availability to plants by influencing nutrient leakage from plant tissues, nutrient release from soil organisms, mineral weathering, various inorganic nutrient transformations, and nutrient transport in both soil solution and sediment. These aspects of freeze-thaw processes are given in this review. A frequently reported observation is that soil water content controls the extent of freeze-thaw impacts on several chemical, physical, and biological processes and components important for nutrient cycling. Practices affecting soil water content, such as tillage and crop residue management, may therefore provide opportunities for managing freeze-thaw impacts on nutrient use efficiency in crop …

Frost Tillage For Soil Management In The Northeastern Usa, Harold M. Van Es, Robert R. Schindelbeck

Journal of the Minnesota Academy of Science

Tillage during the winter is typically considered impossible, despite its desirability in some cases. Soil freezing results in net upward movement of water to the freezing zone which facilitates primary tillage or incorporation of amendments. these can be performed during a time window when the frost layer is sufficiently thin to be ripped and the underlying soil is tillable. We evaluated the feasibility of frost tillage and performed an agronomic comparison with spring-tilled soil. Soil conditions conductive to frost tillage occurred during three time windows in the 1991/1992 and two in the 1992/1993 winter at Ithaca, NY. Frost tillage resulted …

Overwinter Changes In Dry Aggregate Size Distribution Influencing Wind Erodibility In A Spring Wheat-Summerfallow Cropping System, Stephen D. Merrill, Alfred L. Black, Ted M. Zobeck

Journal of the Minnesota Academy of Science

A long-term study of the wind erodibility properties of a two-year spring wheat-summerfallow cropping systems was started in 1988 in south-central North Dakota as part of an USDA-ARS led effort to construct a process-oriented soil erosion predictive model. Observations were conducted on a conservation tillage experiment established in 1984 on soil classified in the U.S. as Typic-Pachic Haploborolls and in Canada as Brown to Dark Brown Chenozemic. The experiment included four residue-management treatments defined by targeted residue coverages: no-till, > 60% cover; minimal-till, 30% to 60% cover and undercutter dominated; conventional-till, < 30% cover and disk dominated; low-residue, < 5 % cover. Fall and spring measurements of dry aggregate size distribution (ASD) of surface soil (0 to 4 cm depth), and overwinter changes in ASD are reported here. A rotary sieve produced six size fractions ranging from < 0.42 mm to > 19.2 mm diameter. Measurements of ASD are expressed as geometric …

Frozen Soils: A Perspective On Past And Future Research For Promoting Sustainable Agricultural Systems, Jerry K. Radke, Brenton S. Sharratt, W. Doral Kemper, Dale A. Bucks

Journal of the Minnesota Academy of Science

Frozen soils impact many industries which rely· on soil, water, and .air resources in developing and manufacturing products. Most noteworthy is the agricultural industry in the northern United States where soils, which sustain food and fiber production, are subjected to frequent freezing and thawing. Soil freezing and thawing influences soil erodibility, surface and ground water quality, air quality, and biological activity. Many strides toward understanding frozen soil processes and managing lands to minimize the adverse effects of freezing and thawing have been made over the last two decades. Yet, further efforts to identify frozen soil processes which influence wind and …

Relative Soil Aeration In A Cultivated Prairie Pothole, Alan Olness, J. A. Staricka, J. A. Daniel, G. R. Benoit, J. L. Rinke

Journal of the Minnesota Academy of Science

Many small prairie potholes receive surface runoff from their catchments and serve as a focal point of ground water recharge. Soil aeration controls the solubility and form of many soil chemicals. Platinum electrodes are sensitive to oxygen and provide a very sensitive indicator of its presence. Electrodes were installed at the 15-, 30-, and 45-cm depth across two transects within a shallow, cultivated depression which serves as a recharge site for groundwater. Soils on the rim of the depression remained aerobic throughout two consecutive cropping years even at 45 cm. Soils within the depression became anaerobic briefly in the first …

Morphological Indicators Of Seasonally-Saturated Soils For A Hydrosequence In Southeastern Minnesota, J. C. Bell, J. A. Thompson, C. A. Butler

Journal of the Minnesota Academy of Science

The duration and depth of seasonal soil saturation affects soil suitability for many landuses and are critical factors in the determination of hydric soil boundaries for jurisdictional wetland delineations. Biochemical processes in saturated, anaerobic soil conditions lead to the genesis of soil morphological features that indicate the duration of seasonal saturation. However, few prior studies confirm the relationships between soil hydrology and soil morphology in Minnesota landscapes. We monitored water table and piezometric elevations, soil temperature, redox potential, and soil matric potential at multiple depths for five locations along a hillslope hydrosequence of well to very poorly drained prairie soils …

Karst In Siliceous Rocks: The Speleothem Medium Of Finger Flutings And Its Isotopic Geochemistry, Robert G. Bednarik

International Journal of Speleology

The isotopic geochemistry relating to the re-precipitation of calcite in caves is considered, in terms of its theory, natural manifestations, and relationship with questions of radiometric dating of carbonate speleothems. Specific forms of’ such deposits are considered, together with the various modification processes they are subjected to. More specifically, particular forms of rock art found within, as well as on or under such deposits are examined, such as finger flutings commonly found in caves of Europe and Australia. Some of the variables relating to their occurrence are elucidated, their preservation and possible dating is reviewed in the light of these …

Paleokarst Of The Bohemian Massif In The Czech Republic: An Overview And Synthesis, Pavel Bosàk

International Journal of Speleology

Paleokarst of the Bohemian Massif on the territory of the Czech Republic developed as polygenetic and polycyclic forms with several phases of fossilization and rejuvenation depending on tectonic phases and deep chemical weathering. Paleotectonic period (pre-Permian in general) was characterized by evolution of relatively minor depositional and local paleokarsts. Neotectonic (platform) period (post-Permian) favoured the prolonged karst evolution of interregional paleokarst in two karst periods and several more or less distinctly separated karst phases.

Karst In Siliceous Rocks - Karst Landforms And Caves In The Auyàn-Tepui Massif (Est. Bolivar, Venezuela), Leonardo Piccini

International Journal of Speleology

During the expedition "Tepuy 93", six caves were explored in the precambrian quartzites of Roraima Group, in the Auyan-tepui massif. One of this caves reaches the depth of 370 m and a development of almost 3 km; its name is “Sima Auyan-tepui Noroeste” and it is currently the deepest cave in the world discovered in siliceous rocks The geological and morphological study of this cave has underlined again the importance of deep solutional weathering, along the network of fractures for the formation of caves in siliceous rocks. The different formation stages of the big superficial shafts, called “simas” were observed …

On Some Cave Minerals From Northern Norway, Bogdan Petroniu Onac, Stein-Erik Lauritzen

International Journal of Speleology

The present paper aims to point out the results of 31 samples from some Norwegian caves that have been analysed with respect to their mineralogical composition. Identification of the minerals was done by X-ray diffraction, thermal, infrared spectroscopy and scanning electron microscopy. Seventeen minerals were identified belonging to 4 groups: carbonates, sulphates, oxides-hydroxides and silicates.