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Browsing by Subject "scientific drilling"

Now showing 1 - 3 of 3
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    Information Circular 18. Subsurface Research and Scientific Drilling in Western Minnesota
    (Minnesota Geological Survey, 1980) Southwick, D.L.
    Minnesota citizens benefit in many ways from geological information on the state. As population and complex technology expand, the rocks and glacial materials of the state are called on more and more to provide ground water, mineral commodities, and fuels, and also to accommodate special engineering structures for the safe storage of petroleum, natural gas, heated water, and a bewildering array of waste products. Sound geologic data are essential for proper exploitation and management of the geologic environment and avoidance of serious decision errors. In another sense the rocks themselves pose interesting academic questions about the origin and development of continental crust in early geologic time, and also about the more recent glacial history of the upper midwest. These questions and their answers contribute to the intellectual richness of our lives, and our thinking about them commonly leads to unexpected practical benefits.
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    Information Circular 24. Scientific Core Drilling in North-Central Minnesota: Summary of 1986 Lithologic and Geochemical Results
    (Minnesota Geological Survey, 1987) Mills, Sarah J.; Southwick, D.L.; Meyer, Gary N.
    In 1986, the Minnesota Geological Survey (MGS) continued a program of scientific test drilling for the purpose of acquiring a better understanding of the Precambrian bedrock of Minnesota. The work was undertaken as part of Minnesota's contribution to CUSMAP projects of the U.S. Geological Survey (USGS) in the International Falls and Roseau 10 x 20 quadrangles. The acronym CUSMAP refers to Conterminous United States Mineral Appraisal Program, a cooperative undertaking of the USGS and state geological surveys that, in the case of Minnesota, involves federal funding of high-resolution aeromagnetic surveys and state funding of follow-up test drilling and limited geologic mapping. A secondary objective of the drilling program has been the acquisition of subsurface data on the stratigraphy, lithology, and thickness of the Quaternary surficial deposits which overlie the Precambrian bedrock. A reconnaissance map of the surficial deposits in the Roseau 10 x 20 quadrangle (1:250,000) will be published in 1988.
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    Information Circular 26. Scientific Core Drilling in Parts of Koochiching, Itasca, and Beltrami Counties, North-Central Minnesota, 1987-1989: Summary of Lithological, Geochemical, and Geophysical Results
    (Minnesota Geological Survey, 1989) Boerboom, Terrence J.; Jirsa, Mark A.; Southwick, D.L.; Meints, Joyce P.; Campbell, Frederick K.
    This report summarizes the results of scientific core drilling undertaken primarily to gain a better understanding of the bedrock geology in north-central Minnesota. The drilling and concomitant mapping were supported by the Minerals Diversification Program of the state legislature. The study area lies in southern Koochiching, northern Itasca and east-central Beltrami Counties. This region was selected because data are suggestive of mineral resource potential, but existing geologic maps were too generalized to guide private minerals exploration efforts. The thick cover of glacial deposits in this region requires bedrock geologic mapping to be based largely on the interpretation of geophysical maps. Core drilling and outcrop mapping identify the rock types responsible for the geophysical patterns. It is hoped that geologic mapping by this method will encourage private minerals exploration. In addition, this mapping is an acceleration of on-going efforts by the Minnesota Geological Survey to produce accurate geologic maps of the state to meet existing and future societal, academic and economic needs. The resulting bedrock geologic map at 1:250,000 scale has been released as Minnesota Geological Survey Open-File Report 89-1 which is being reviewed before formal publication. In the course of the drilling program much information was acquired regarding the thickness and lithology of Quaternary surficial deposits and the locally thick weathered bedrock materials (regolith). No formal plans exist at this time to publish an interpretation of these data, but the data are presented here on the geologic logs.