HR: 0800h
AN: T11B-0577    [Abstracts]
TI: Heat Flow and Heat Production in Korea
AU: * Lee, Y
EM: ymlee@kigam.re.kr
AF: Korea Institute of Geoscience and Mineral Resources, 30 Gajeong-dong, Yuseong-gu, Daejeon, 305-350, Korea, Republic of
AU: Kim, J
EM: geotherm01@hanmail.net
AF: Kongju National University, 182 Shinkwan-dong, Kongju, 314-701, Korea, Republic of
AU: Kim, H
EM: khc@kigam.re.kr
AF: Korea Institute of Geoscience and Mineral Resources, 30 Gajeong-dong, Yuseong-gu, Daejeon, 305-350, Korea, Republic of
AU: Hwang, S
EM: hwangse@kigam.re.kr
AF: Korea Institute of Geoscience and Mineral Resources, 30 Gajeong-dong, Yuseong-gu, Daejeon, 305-350, Korea, Republic of
AU: Koo, M
EM: koo@kongju.ac.kr
AF: Kongju National University, 182 Shinkwan-dong, Kongju, 314-701, Korea, Republic of
AB: The mean heat flow in Korea estimated in 365 locations (mines, coal fields, groundwater, hot spring wells) is 60 ± 11 mW/m²; mean geothermal gradients is 25.1 °C/km. High heat flow values appear in the southeastern part, the central western part, and the northeastern part of Korea. In the tectonic provinces, heat flow is 66 mW/m² for Gyeonggi Massif, 65 mW/m² for Okcheon Fold Belt, 60 mW/m² for Yeongnam Massif, 72 mW/m² for Gyeongsang Basin, and 75 mW/m² for Yeonil Basin. In the aspect of the lithology, heat flow is 71 ± 2 mW/m² for the sedimentary rock area, 68 ± 2 mW/m² for the sedimentary/volcanic rock area, 67 ± 1 mW/m² for the plutonic rock area, and 62 ± 2 mW/m² for the metamorphic rock area. In the geological time sequence, heat flow is 78 ± 5 mW/m² for the Cenozoic strata, 68 ± 1 mW/m² for Mesozoic, 65 ± 3 mW/m² for the Paleozoic strata, 67 ± 8 mW/m² for the Proterozoic strata, and 62 ± 2 mW/m² for the Archean strata. From the relationship between heat flow and Moho depth, we found that the shallow Moho depth area is likely to have higher heat flow values than the area of the thick crust. Heat production was measured by chemical analysis and gamma-ray logs on basement rocks (86 granite and 37 gneiss samples). The mean heat production is 2.15 μW/m³ for granite, and 2.22 μW/m³ for gneiss. The mean heat production is 2.52 μW/m³ for Gyeonggi Massif, 2.16 μW/m³ for Okcheon Fold Belt, 2.35 μW/m³ for Yeongnam Massif, and 2.01 μW/m³ for Gyeongsang Basin. The tectonic provinces with high mean heat flow tend to have low mean heat production. Therefore, heat production is unlikely to have a first-order importance in determining surface heat flow distribution in Korea. The analysis of 12 heat production and heat flow data sets from granite area in Gyeongsang Basin shows a linear relationship between heat production and surface heat flow, which is known as q=q_r+AD, where q is surface heat flow, q_r is reduced heat flow, A is heat production, and D is characteristic depth. We found q=47.06+12.29A for Gyeongsang Basin.
DE: 5134 Thermal properties
DE: 5418 Heat flow
DE: 8199 General or miscellaneous
DE: 9320 Asia
DE: 9699 General or miscellaneous
SC: Tectonophysics [T]
MN: 2007 Fall Meeting