江苏东海超高压榴辉岩的热导率及对大陆科学钻探研究的意义

欧新功; 金振民; 金淑燕; 徐海军

Volume 28 Issue 2

Mar. 2003

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Article Navigation > Earth Science > 2003 > 28(2): 129-136

OU Xin-gong, JIN Zhen-min, JIN Shu-yan, XU Hai-jun, 2003. Thermal Conductivity of Donghai UHP Eclogite and Its Significance for Studying Continental Scientific Drilling. Earth Science, 28(2): 129-136.

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OU Xin-gong, JIN Zhen-min, JIN Shu-yan, XU Hai-jun, 2003. Thermal Conductivity of Donghai UHP Eclogite and Its Significance for Studying Continental Scientific Drilling. Earth Science, 28(2): 129-136.

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Thermal Conductivity of Donghai UHP Eclogite and Its Significance for Studying Continental Scientific Drilling

Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China

Received Date: 2003-01-17
Publish Date: 2003-03-25

Abstract

Abstract

UHP eclogite samples were collected from surface exposures around Chinese Continental Scientific Drilling (CCSD) drill-site in Donghai area have been measured on thermal conductivity to investigate the effect of mineral components and texture on thermal conductivity (TC) of eclogite. Measured thermal conductivities vary from 3.222 to 3.716 Wm^-1·K^-1 with average value 3.511 Wm^-1·K^-1, which depend on the volume ratio of garnet and omphacite (V_Grt/V_Omp) in the rocks. This correlation was fitted to the function K=3.767-0.18× (V_Grt/V_Omp), which shows the thermal conductivity of eclogite in this area decreased as increasing of V_Grt/V_Omp. Inhomogeneous distribution of minerals and the foliation texture in rocks also significantly affect the value of thermal conductivity and induce the anisotropy up to 10% in eclogite. For temperature dependence, according to calculations from the correlation between K-T, thermal conductivities under high temperature were also fitted to a function: K (T) =1/ (7.85×10^-2+6.95×10^-4×T), T is absolute temperature. Based on this function and the published geothermal data of this area, a depth dependence of thermal conductivity can be concluded. The K of eclogite decreased as the increasing depth of CCSD drill hole. The K values of eclogite in surface and in bottom of hole are 3.511 Wm^-1·K^-1 and 2.687 Wm^-1·K^-1, respectively. The K of eclogite will be predicted to be decreased about 24% from surface to the end of 5 000 m depth of CCSD. These research results are helpful to establish the geothermal model of this area and to interpret well logging results from CCSD.
- UHP eclogite,
- thermal conductivity,
- half-space line TC meter,
- CCSD,
- Jiangsu Donghai

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References(22)

References

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