Deep crustal structures of eastern China and adjacent seas revealed by magnetic data

  • Li C
  • Chen B
  • Zhou Z
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Abstract

Through reduction to the North Pole and upward continuation of the total field magnetic anomalies, we analyze magnetic patterns and spatial distributions of different tectonic blocks and crustal faults in eastern China and adjacent seas. Depths to the Curie isotherms are further estimated from radially averaged amplitude spectra of magnetic data reduced to the pole. Data reductions effectively enhance boundaries of regional tectonic belts, such as the Dabie ultra-high metamorphic belt, the Tanlu Fault, and the Diaoyudao Uplift. Curie depths are estimated at between 19.6 and 48.9 km, with a mean of 31.7 km. The Subei Basin and the south Yellow Sea Basin in the lower Yangtze block show relatively deep Curie isotherms, up to about 35 km in depth, whereas in the surrounding areas Curie depths are aver-aged at about 25 km. This implies that the lower Yangtze Block has experienced a unique tectonic evolution and/or has unique basement lithology and structures. From a regional perspective, sedi-mentary basins, such as the Subei Basin, the south Yellow Sea Basin, and the East China Sea Basin, normally show deeper Curie isotherms than surrounding uplifts such as the Diaoyudao Uplift and the Zhemin Uplifts. Curie isotherms also upwell significantly in volcanically active areas such as the Ryu-kyu Arc and the Cheju Island, confirming strong magmatic and geothermal activities at depth. magnetic anomaly, curie isotherm, Tanlu Fault, Sulu-Dabie Orogen, East China Sea Basin, lower Yangtze Block, geodynamics Magnetic anomalies bear information related to depths, magnetizations, and geometries of magnetic sources. Basement structures such as depths and faults can be effectively studied through magnetic data reduction and interpretation. Based on different research objectives and magnetic patterns, we can apply different data re-duction and inversion techniques. For example, Euler deconvolution can be applied in estimating depths to magnetic sources and their rough geometries [1]

Author-supplied keywords

  • Curie isotherm
  • East China Sea Basin
  • Geodynamics
  • Lower Yangtze Block
  • Magnetic anomaly
  • Sulu-Dabie Orogen
  • Tanlu Fault

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Authors

  • Chun Feng Li

  • Bing Chen

  • Zu Yi Zhou

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