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Volume 19 Issue 3
Jun 2008
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Article Contents
Qing-qing QIAO, Qing-sheng LIU, Ning QIU, Yuan-yuan FU, Su-tao ZHAO, Yao WU, Tao YANG, Zhen-min JIN. Investigation of Curie Point Depth in Sulu Ultrahigh-Pressure Metamorphic Belt, Eastern China. Journal of Earth Science, 2008, 19(3): 282-291.
Citation: Qing-qing QIAO, Qing-sheng LIU, Ning QIU, Yuan-yuan FU, Su-tao ZHAO, Yao WU, Tao YANG, Zhen-min JIN. Investigation of Curie Point Depth in Sulu Ultrahigh-Pressure Metamorphic Belt, Eastern China. Journal of Earth Science, 2008, 19(3): 282-291.

Investigation of Curie Point Depth in Sulu Ultrahigh-Pressure Metamorphic Belt, Eastern China

Funds:

Major State Basic Research Development Program of China 2003CB716506

the National Natural Science Foundation of China 40474025

More Information
  • Corresponding author: Liu Qingsheng, lqs321@cug.edu.cn
  • Received Date: 26 Jan 2008
  • Accepted Date: 26 Mar 2008
  • The Curie point depth of continental crust can reflect the regional tectonic pattern and geothermal structures. Analysis of magnetism is an efficient way to obtain the Curie point depth on a regional scale. This study systematically investigated the Curie point depth of Sulu (苏鲁) ultrahigh pressure (UHP) metamorphic belt (33°40′N to 36°20′N and 118°E to 120°E, ca. 60 000 km2), eastern China using aeromagnetic data. The results show that the Curie point depth of the Sulu region varies from 18.5 to 27 km. The shallowest Curie point depth (ca. 18.5 km) is located in Subei (苏北) subsidence, where the estimated temperature gradient value is about 31.35 ℃/km, which is comparable with the measured value of 30 ℃ /km. In addition, a two-dimensional numerical solution of the heat conduction was used to calculate the temperature field to a depth of 30 km along the profile from Tancheng (郯城) to Lianshui (涟水) with a length of 139 km. The steady state model solved using the finite element method shows that the temperature around the Curie point depth is about 585.36 ℃, which is close to the Curie temperature (580 ℃) of magnetite at atmospheric pressure. These results provide newinsights into the tectonic and continuous thermal structures of the Sulu UHP metamorphic belt.

     

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