Investigation of Curie Point Depth in Sulu Ultrahigh-Pressure Metamorphic Belt,Eastern China
  • 【摘要】

    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 ... 展开>>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 Sniu region varies from 18.5 to 27 kin. 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℃/kin, which is comparable with the measured value of 30℃/krn. 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 new insights into the tectonic and continuous thermal structures of the Sulu UHP metamorphic belt. 收起<<

  • 【作者】

  • 【作者单位】

    Institute of Geology and Geophysics/Institute of Geophysics & Geomatics/School of Earth and Space Sciences/Faculty of Earth Sciences

  • 【刊期】

    地球科学学刊 SCI 2008年3期

  • 【关键词】

    aeromagnetic anomaly  Curie point  geothermal structure  Sulu UHP metamorphic belt. 

  • 【基金项目】

    国家重点基础研究发展计划(973计划) 国家自然科学基金