Evaluation and targeting of geothermal energy resources in the southeastern United States. Progress report, April 1, 1977--June 30, 1977

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Progress is reported in the detailed study of the Winnsboro complex, South Carolina, as part of a broader project to provide insight into the behavior of uranium and thorium in syn- and post-metamorphic granitic plutons. In the area of the Winnsboro complex, a regional medium-pressure metamorphic event which reached amphibolite facies was followed by deformation and uplift with decrease in regional temperature and pressure. The Winnsboro complex was intruded with a resultant low-pressure contact metamorphism which reached hornblende hornfels grade in the xenoliths of the relatively dry Winnsboro biotite. In a continuing effort to develop a correlation between bulk chemistry … continued below

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95 pages

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Costain, John K.; Glover, Lynn, III & Sinha, A. Krishna October 1, 1977.

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Progress is reported in the detailed study of the Winnsboro complex, South Carolina, as part of a broader project to provide insight into the behavior of uranium and thorium in syn- and post-metamorphic granitic plutons. In the area of the Winnsboro complex, a regional medium-pressure metamorphic event which reached amphibolite facies was followed by deformation and uplift with decrease in regional temperature and pressure. The Winnsboro complex was intruded with a resultant low-pressure contact metamorphism which reached hornblende hornfels grade in the xenoliths of the relatively dry Winnsboro biotite. In a continuing effort to develop a correlation between bulk chemistry and U and Th, the index CaO/(K/sub 2/O + Na/sub 2/O) was applied to the core from the Rion pluton. A good negative correlation was found between this index and the uranium content of the core from the Rion pluton. There is a good positive correlation between U and SiO/sub 2/ in the Rion core. An excellent correlation between near-surface heat flow, q, and near-surface heat generation, A, was found for drill sites in the Winnsboro-Rion, Liberty Hill-Kershaw, and Roxboro plutons. These plutons span a distance of about 450 km and span an age of about 275 m.y. The equation of the straight-line relationship is q = 0.66 + 7.2 x 10/sup 5/A. The existence of the linear relationship in the southeast United States is encouraging, since it strengthens the capability for prediction of subsurface temperatures based on a radiogenic model. Partial confirmation of a radiogenic model was provided by a geothermal gradient of 37.4/sup 0/C/Km (2/sup 0/K/100 ft) in an existing hole in sediments of the Atlantic Coastal Plain at Stumpy Point, North Carolina. The bottomhole temperature at a depth of 1.35 km (4430 ft) is 66/sup 0/C. The gradient is consistent with theoretical predictions using reasonable values of thermal conductivity and heat generation in a buried radiogenic source. (JGB)

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95 pages

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Dep. NTIS, PC A05/MF A01.

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  • October 1, 1977

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Thumbnail image of item number 1 in: 'Evaluation and targeting of geothermal energy resources in the southeastern United States. Progress report, April 1, 1977--June 30, 1977'.
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Costain, John K.; Glover, Lynn, III & Sinha, A. Krishna. Evaluation and targeting of geothermal energy resources in the southeastern United States. Progress report, April 1, 1977--June 30, 1977, report, October 1, 1977; United States. (https://digital.library.unt.edu/ark:/67531/metadc1065672/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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