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Articles 1 - 30 of 49
Full-Text Articles in Earth Sciences
Presence Of Upper Triassic By Conodonts In Armutlu Peninsula (Western Pontides), Fuat Önder, M. Cemal Göncüoğlu
Presence Of Upper Triassic By Conodonts In Armutlu Peninsula (Western Pontides), Fuat Önder, M. Cemal Göncüoğlu
Bulletin of the Mineral Research and Exploration
No abstract provided.
A Rapid Decomposition Method For Analyzing Zirconia, Bahattin Ayranci
A Rapid Decomposition Method For Analyzing Zirconia, Bahattin Ayranci
Bulletin of the Mineral Research and Exploration
No abstract provided.
An Example For The Multivariate Geostatistical Analyses Of Geochemical Data: Iron Mines Of Di̇vri̇ği̇ Area, Central Turkey, Taner Ünlü, Henrik Stendal
An Example For The Multivariate Geostatistical Analyses Of Geochemical Data: Iron Mines Of Di̇vri̇ği̇ Area, Central Turkey, Taner Ünlü, Henrik Stendal
Bulletin of the Mineral Research and Exploration
No abstract provided.
Sedimentary Petrography And Origin Of Phosphate Peloids Of The Mazidağ-Deri̇k Area (Mardi̇n, Southeast Turkey), Baki Varol
Bulletin of the Mineral Research and Exploration
No abstract provided.
Petrological Investigation Of Lower Tertiary Aged Detrital Sequence Around Burdur, Emel Bayhan
Petrological Investigation Of Lower Tertiary Aged Detrital Sequence Around Burdur, Emel Bayhan
Bulletin of the Mineral Research and Exploration
No abstract provided.
Tectonic Zones Of The Caucasus And Their Continuations In The North-Eastern Of Turkey : A Correlation, Ali Yilmaz
Tectonic Zones Of The Caucasus And Their Continuations In The North-Eastern Of Turkey : A Correlation, Ali Yilmaz
Bulletin of the Mineral Research and Exploration
No abstract provided.
Evolution Of The Post-Collisional Cratonic Basins In Eastern Taurus, Ergün Akay
Evolution Of The Post-Collisional Cratonic Basins In Eastern Taurus, Ergün Akay
Bulletin of the Mineral Research and Exploration
No abstract provided.
Stratigraphy Of The Muş Tertiary Basin, Ergün Akay, Emin Erkan, Engin Ünay
Stratigraphy Of The Muş Tertiary Basin, Ergün Akay, Emin Erkan, Engin Ünay
Bulletin of the Mineral Research and Exploration
No abstract provided.
Geology Of The Menderes Massif And The Lycian Nappes South Of Deni̇zli̇, Western Taurides, Aral I. Okay
Geology Of The Menderes Massif And The Lycian Nappes South Of Deni̇zli̇, Western Taurides, Aral I. Okay
Bulletin of the Mineral Research and Exploration
No abstract provided.
The Stratigraphy And Geological Development Of The Carbonate Platform In The Pozanti-Karsanti-Karai̇sali (East Taurus) Area, Cavit Demi̇rkol
The Stratigraphy And Geological Development Of The Carbonate Platform In The Pozanti-Karsanti-Karai̇sali (East Taurus) Area, Cavit Demi̇rkol
Bulletin of the Mineral Research and Exploration
No abstract provided.
Stratigraphy Of The Pre-Jurassic Blocky Sedimentary Rocks To The South Of Bursa, Nw Turkey, Orhan Kaya, Orhan Özkoçak, Alvis Li̇senbee
Stratigraphy Of The Pre-Jurassic Blocky Sedimentary Rocks To The South Of Bursa, Nw Turkey, Orhan Kaya, Orhan Özkoçak, Alvis Li̇senbee
Bulletin of the Mineral Research and Exploration
No abstract provided.
Geology And Stratigraphy Of The Cainozqic Sedimentary Rocks In The Kale-Kurbalik Area, Deni̇zli̇, Southwestern Turkey, H.Yavuz Hakyemez
Geology And Stratigraphy Of The Cainozqic Sedimentary Rocks In The Kale-Kurbalik Area, Deni̇zli̇, Southwestern Turkey, H.Yavuz Hakyemez
Bulletin of the Mineral Research and Exploration
No abstract provided.
The Structural And Stratigraphic Position Of Dağküplü (North Of Eski̇şehi̇r) Ophiolithic Complex And Petrography Of Cumulates, H.Jerf Asutay, Arif Küçükayman, M.Ziya Gözler
The Structural And Stratigraphic Position Of Dağküplü (North Of Eski̇şehi̇r) Ophiolithic Complex And Petrography Of Cumulates, H.Jerf Asutay, Arif Küçükayman, M.Ziya Gözler
Bulletin of the Mineral Research and Exploration
No abstract provided.
Rock Phosphates Are Poor Fertilizers For Non-Leaching Soils In South-Western Australia, Michael D A Bolland, Bob Gilkes
Rock Phosphates Are Poor Fertilizers For Non-Leaching Soils In South-Western Australia, Michael D A Bolland, Bob Gilkes
Journal of the Department of Agriculture, Western Australia, Series 4
Field experiments conducted on our non leachng soils from 1975 to 1988 have consistently shown that rock phosphates, compared with freshly applied superphosphate each year, are a relatively ineffective fertilizer in the year of application and in the years after application.
Analysis Of Hydrogeologic Sensitivity In Winona County, Minnesota, Michael D. Trojan, James A. Perry
Analysis Of Hydrogeologic Sensitivity In Winona County, Minnesota, Michael D. Trojan, James A. Perry
Journal of the Minnesota Academy of Science
Hydrogeologic sensitivity to contamination throughout Winona County in southeastern Minnesota was assessed using the recently developed Trojan-Perry rating method. Sensitivity varied across and within three analysis regions. The Prairie du Chien Aquifer, comprising Region I, showed a wide range of sensitivity, varying from moderate to extreme. Areas of greatest sensitivity were sites where the aquifer was unconfined and overlain by a thin layer of unconsolidated material and karst bedrock. Under these conditions water may rapidly infiltrate through the soil zone and highly dissolved bedrock and into underlying aquifers. The Ironton-Galesville Aquifer, comprising Region II, was protected from surface infiltration by …
Geographic Information Systems, Data, And Water Resources, Dwight A. Brown, Philip J. Gersmehl
Geographic Information Systems, Data, And Water Resources, Dwight A. Brown, Philip J. Gersmehl
Journal of the Minnesota Academy of Science
ABSTRACT-We evaluate three data handling methods for use in a GIS analysis of land-cover change impacts on runoff. A universe of 2560 point samples is analyzed to provide runoff calculations that would se1:7e _as a comparison base to evaluate different attribute logic systems. The attribute logics ~e evaluate are two va~1at1ons of tag and one of count. We chose a two by five mile area of Dakota County, Mmnesota as the test site, and prepared raster GIS maps of soil hydrologic groups and two plausible land covers. The count 1:1~thod for handling the generalization of data produced results that were …
Landscape Assessment Of Soil Erosion And Nonpoint Source Pollution, Ian D. Moore, John L. Nieber
Landscape Assessment Of Soil Erosion And Nonpoint Source Pollution, Ian D. Moore, John L. Nieber
Journal of the Minnesota Academy of Science
ABSTRACT-The hydrologic processes occurring in the landscape are a manifestation of its topographic attributes. Spatially variable topographic-based attributes permit the distribution of hydrologic and nonpoint source pollution processes to be mapped within catchments. They can be derived from Digital Elevation Models (DEMs) using a variety of Terrain Analysis Methods (TAMs). The relationships between topographic indices and the spatial distribution of the potential for surface runoff, groundwater recharge, soil erosion, and evapotranspiration are graphically illustrated.
Water Quality In Southeastern Minnesota Streams: Observations Along A Gradient Of Land Use And Geology, Nels H. Troelstrup Jr., James A. Perry
Water Quality In Southeastern Minnesota Streams: Observations Along A Gradient Of Land Use And Geology, Nels H. Troelstrup Jr., James A. Perry
Journal of the Minnesota Academy of Science
ABSTRACT-Surface water quality in southeastern Minnesota's driftless area exhibits subregional and local spatial patterns which are highly correlated with subsurface geology and land-use practices. Some variables appear to respond on subregional or watershed scales. Nitrate, specific conductance, alkalinity, and surface water atrazine concentrations were lower in streams originating from the Prairie Du Chien or Jordan sandstone ~quifers of easte:n Fillmore and Houston Counties than those originating from the Galena limestone aquifer m west-central Fillmore County. In addition, the numbers of pollution intolerant and functionally specialized invertebrates in the benthic community were higher in the eastern streams. Gross primary production on …
Origin And Developmental History Of Minnesota Lakes, H. E. Wright Jr.
Origin And Developmental History Of Minnesota Lakes, H. E. Wright Jr.
Journal of the Minnesota Academy of Science
ABSTRACT-Most lakes in Minnesota owe their origin directly or indirectly to glacial deposition or erosion 10,000 to 20,000 years ago. The lakes' shapes have since been modified by waves and currents near the shores and by the deposition of sediment off-shore-principally the sediment produced by growth of algae and other organisms. This sediment is a receptacle for pollen grains blown into the lake from the surrounding vegetation, and the stratigraphic succession of pollen grains records the postglacial vegetational and thus climatic history of the area. The sediment also preserves the fossils of microorganisms that reveal by their chemical composition the …
Nitrogen Management Related To Groundwater Quality In Minnesota, James L. Anderson, Gary L. Malzer, Gyles W. Randall, George W. Rehm
Nitrogen Management Related To Groundwater Quality In Minnesota, James L. Anderson, Gary L. Malzer, Gyles W. Randall, George W. Rehm
Journal of the Minnesota Academy of Science
ABSTRACT-Minnesota ranks fifth in overall fertilizer nitrogen (FN) use. Nitrogen is essential for crop production; however, there are concerns about this use relative to profitability and potential impacts on groundwater. There are many sources and sinks of nitrogen in ecosystems. The impact of agricultural management practices on groundwater requires that all sources and fates be considered before FN rates are determined. Research is underway to evaluate relationships between FN application for continuous com and movement of nitrate through soil profiles. Growers making N management decisions have to be able to evaluate the complex nature of N in the environment when …
Natural And Anthropogenic Forces Acting On A Forest Lake, M. C. Whiteside, M. B. King, K. Pulling
Natural And Anthropogenic Forces Acting On A Forest Lake, M. C. Whiteside, M. B. King, K. Pulling
Journal of the Minnesota Academy of Science
ABS1RACT-Lak~ Itasca, Minnes~ta is located within one of the more popular state parks. Since the turn of the centmy, loggmg, fire protection, and development within the watershed have put modest pressures on the ecosystem. The presence of the University of Minnesota's Biological and Forestry Station on the lake has encouraged research in this region. Consequently there are numerous research reports and papers which are available _at the station's library. We examined data collected over the past 25 years to see if we could detect changes ~~ the lake. We detected no changes in phytoplankton, macrophyte, zooplankton, or zoobenthos com~urnues, but …
The Water Quality And Management Of Lakes In The Twin Cities Metropolitan Area, Richard A. Osgood, Gary L. Oberts
The Water Quality And Management Of Lakes In The Twin Cities Metropolitan Area, Richard A. Osgood, Gary L. Oberts
Journal of the Minnesota Academy of Science
ABSTRACT-We have detected a slow degradation in the water quality of Twin Cities Metropolitan Area lakes du~ to phospho_rus enrichment. While the water quality of the lakes does not appear to limit most uses, nmsances do exist. We have further discovered that commonly-used watershed treatments such as wetland diversions and ponding, are ineffective ~t reversing or completely mitigating the degradati~n following land development. Th_erefore, we are su~gestmg that lake managers reduce the external loading of phosphorus to the greatest ~oss_1ble extent; then, 1f further water quality improvements are necessary, that measures which treat eutroph1cat1on-related symptoms be considered for the long-term …
Lake Mixing Dynamics And Water Quality Models, Heinz G. Stefan
Lake Mixing Dynamics And Water Quality Models, Heinz G. Stefan
Journal of the Minnesota Academy of Science
ABSTRACT-To forecast water quality changes or to evaluate the potential success of restoration measures in lakes, it is necessary to formulate "models" which relate lake water quality to the inflows and outflows of materials and energy. Concepts of dynamic deterministic (cause-effect) models and examples are presented. The relationship between internal thermo-hydraulic processes and water quality is stressed. Stratification mixing, and nutrient kinetics are included in these models.
Viruses And Drug Resistant Bacteria In Groundwater Of Southeastern Minnesota, Sagar M. Goyal, Daniel Amundson, Robert A. Robinson, Charles P. Gerba
Viruses And Drug Resistant Bacteria In Groundwater Of Southeastern Minnesota, Sagar M. Goyal, Daniel Amundson, Robert A. Robinson, Charles P. Gerba
Journal of the Minnesota Academy of Science
ABSTRACT-Karst topography of soils in southeastern Minnesota is responsible for the formation of sinkholes, subsurface cracks, and underground rivers which may enhance the transportation of surface contaminants into groundwater. The present study was conducted to determine the presence of human pathogenic viruses, coliforms, fecal coliforms and coliphages in private rural wells of this area. The occurrence of drug resistance in bacteria isolated from groundwater also was studied. Coliform bacteria were detected at least once from 22 of the 26 sites sampled over 34 months. Water from 10 sites yielded drug-resistant indicator bacteria; 25 of 38 (65.8 percent) total coliforms and …
Susceptibility Of Northern Minnesota Lakes To Acid Deposition Impacts, Clifford J. Twaroski, J. David Thornton, Rick L. Strassman, Patrick L. Brezonik
Susceptibility Of Northern Minnesota Lakes To Acid Deposition Impacts, Clifford J. Twaroski, J. David Thornton, Rick L. Strassman, Patrick L. Brezonik
Journal of the Minnesota Academy of Science
ABSTRACT-lake chemistry surveys indicate a large number of lakes with acid neutralizing capability (ANC) below 200 μeq/L occur in northeast Minnesota where shallow soils over bedrock and exposed rock outcrops predominate, and in moraine areas having rolling to steep topography in north-central and east-central Minnesota. In the Boundary Waters area, lake chemistry is strongly associated with bedrock geology. lakes with ANC <100 μeq/L are associated with granite, basalt, and gabbro formations, while lakes with ANC of 100- 200 μeq/L are associated with slate and greenstone formations. In the rest of the state where soils are deep, landform, soil type, and lake hydrology determine lake chemistry. Most low ANC lakes are found in terminal moraine areas. These lakes are generally small ( <40 ha in area), have limited groundwater inflow, and typically classed as precipitation-dominated seepage lakes. Higher ANC lakes (>400 μeq/L) are often associated with agricultural and residential land uses. Relationships found between ANC and bedrock geology, and between ANC and landform and soils, provided the basis for mapping the distribution of low ANC surface waters in Minnesota. …
Residence Times Of Minnesota Groundwaters, Scott C. Alexander, E. Calvin Alexander Jr.
Residence Times Of Minnesota Groundwaters, Scott C. Alexander, E. Calvin Alexander Jr.
Journal of the Minnesota Academy of Science
ABSTRACT-Tritium, 14C, and nitrate analyses for eighty groundwater samples from selected Minnesota aquifers indicate a range of residence times from a few days or weeks to tens of thousands of years. The presence of significant nitrate contamination in groundwater is confined to recent or mixed groundwaters. Isotopic studies can yield information that will be useful in the design of effective groundwater protection plans in Minnesota.
The Regional Nature Of Lake Water Quality Across Minnesota: An Analysis For Improving Resource Management, Steven A. Heiskary, C. Bruce Wilson
The Regional Nature Of Lake Water Quality Across Minnesota: An Analysis For Improving Resource Management, Steven A. Heiskary, C. Bruce Wilson
Journal of the Minnesota Academy of Science
ABSTRACT-The diversity and number of lakes in Minnesota may be better understood by the use of regional characterizations of lake and watershed information. Recent efforts have utilized the ecoregion approach to define seven regions across Minnesota, four of which contain 98 percent of our lake resources. Typical land use patterns vary regionally as do lake water quality patterns. Understanding these patterns will assist lake managers to develop realistic goals and minimize false expectations. Regional assessments facilitate the definition of reasonable goals, expressed in terms of: average summer nutrient concentrations, probability of nuisance conditions ( e.g., estimates of algal bloom frequency), …
County-Based Priority Assessment Methodology For Phasing Of Wellhead Protection Programs, H. O. Pfannkuch, M. E. Campion, D. C. Mccaa, J. M. Palenberg
County-Based Priority Assessment Methodology For Phasing Of Wellhead Protection Programs, H. O. Pfannkuch, M. E. Campion, D. C. Mccaa, J. M. Palenberg
Journal of the Minnesota Academy of Science
ABSTRACT-Setting priorities to schedule and implement wellhead protection programs for municipal and community drinking water supplies is presented in the framework of a general risk assessment approach. This includes a hazard identification procedure representing the likelihood of contaminants being released to the surface environment, a hydrogeologic vulnerability assessment representing the risk of contaminants entering the groundwater supply, and an impact assessment, strongly linked to the population at risk. A methodology was developed to aggregate information on a county basis for Minnesota. The resulting composite risk index map shows a number of counties in the central part of the state roughly …
Factors Affecting Water-Supply Potential Of The Twin Cities Metropolitan Area Aquifer System, Michael E. Schoenberg
Factors Affecting Water-Supply Potential Of The Twin Cities Metropolitan Area Aquifer System, Michael E. Schoenberg
Journal of the Minnesota Academy of Science
ABSTRACT-The Twin Cities aquifer system in Minnesota contains five aquife~s and fou: confining units that together consist of fourteen geologic units. Unconsolidated sand and gravel aqmfers overlie bedrock sandstone and carbonate aquifers. Between 1880 and 1980, groundwater wi_thdrawals have c_aused long-term wate~ level declines of as much as 90 feet in the Prairie du Chien-Jordan aquifer and 240 feet m the deeper Mount S~monHinckley aquifer-the two major sources of groundwater supplies in the ar~a .. The estimated max1mu1:1 continuous withdrawal rate from the aquifer system is about 650 Mgal/d (million gallons per day). This compares with an average daily groundwater …
A Hydrologic Model For Minnesota Peatlands, Kenneth N. Brooks, Dawn R. Kreft
A Hydrologic Model For Minnesota Peatlands, Kenneth N. Brooks, Dawn R. Kreft
Journal of the Minnesota Academy of Science
ABSTRACT-The Peatland Hydrologic Impact Model (PHIM) is a continuous simulation computer model developed over a twelve-year period to aid hydrologists in understanding the hydrologic functions of peatlands and upland-peatland watersheds. An initial conceptual model defined the research needed to create the working m?del. The re~e_arch has become an iterative process of model design, field work, model refinement, ~ode! test1?g, an~ add1t1?nal field work. The model is as physically-based as possible while relying on data mput that 1s readily available to the natural resources community. It simulates streamflow response of peatlands, upland-peatland systems, mined peatlands, and a combination of these watershed …