南沙海槽前陆盆地热流变结构

马辉; 许鹤华; 施小斌; 陈爱华; 刘唐伟

doi:10.3799/dqkx.2011.099

Volume 36 Issue 5

Sep. 2011

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MA Hui, XU He-hua, SHI Xiao-bin, CHEN Ai-hua, LIU Tang-wei, 2011. Lithospheric Thermal-Rheological Structure of Nansha Trough Foreland Basin in South China Sea. Earth Science, 36(5): 939-948. doi: 10.3799/dqkx.2011.099

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MA Hui, XU He-hua, SHI Xiao-bin, CHEN Ai-hua, LIU Tang-wei, 2011. Lithospheric Thermal-Rheological Structure of Nansha Trough Foreland Basin in South China Sea. Earth Science, 36(5): 939-948. doi: 10.3799/dqkx.2011.099

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Lithospheric Thermal-Rheological Structure of Nansha Trough Foreland Basin in South China Sea

doi: 10.3799/dqkx.2011.099

MA Hui^{1, 2},
XU He-hua^{1
,
,},
SHI Xiao-bin¹,
CHEN Ai-hua^{1, 2},
LIU Tang-wei^{1, 2}

1.
CAS Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Guangzhou 510301, China
2.
Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2011-05-28
Publish Date: 2011-09-15

Abstract

Abstract

In order to study the lithospheric thermodynamic properties of Nansha trough foreland basin, we simulate the deep lithosphere temperature field and rheological structure during the thrust faults tectonic activities from Middle Miocene to Holocene and after thrusting (static) in the basin using the finite element method, based on previous studies of geological and geophysical data together with a variety of rock thermodynamic parameters.Simulation results indicate that heat flow contribution from mantle reaches 60%-70% of surface heat flow which is controlled by deep mantle in Nansha trough foreland basin.Thrusting movements increase the surface heat flow in thrust-slip fault belts by 15%-25% to 70-75 mW/m².Our results also show that the temperature of sedimentary layer is less than 200 ℃, while the temperature at Moho varies from 420 to 500 ℃; crust geothermal gradient ranges from 25 to 30 ℃/km.And calculated thickness of thermal lithosphere is about 80 km, which varies slightly laterally.The lithosphere in Nansha waters shows obvious rheological stratification properties, as a typical "sandwich" structure.Horizontally, lithosphere strength decreases in the direction from Nansha trough to thrust belt (NW to SE).The thickness of mechanical lithosphere is about 50 km and the effective elastic thickness ranges from 30 to 32 km.The simulated thermal lithosphere rheological structure also reveals that lithosphere of Nansha basin has rheological characteristics of strong mantle and weak crust, acting as high-strength block.Earthquake activities of Nansha waters are closely related to thermal structure, thermal activity and integrated strength of lithosphere.The weak thermal activity in the crust and high lithosphere strength may be important reasons for rare earthquake occurrence in this area.
- Nansha trough,
- lithosphere,
- temperature field,
- rheological structure,
- earthquakes,
- effective elastic thickness (T_e),
- marine geophysics

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References(48)

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