APPARENT DENSITY INVERSION OF GRAVITY ANOMALY DATA FOR DETECTING THE GEOLOGICAL BOUNDARY BETWEEN YANGTZE BLOCK AND NORTH CHINA BLOCK IN THE SOUTH YELLOW SEA
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摘要: 通过对南黄海及周边船载测量重力数据、现代卫星测高重力数据、陆地测量重力数据以及地球重力模型等多来源重力数据进行整理和融合,对南黄海地区布格重力异常特征进行了分析。利用基于切割法和插值迭代法的大深度位场向下延拓技术的视密度反演法对南黄海布格重力进行处理和解释,结合山东和朝鲜半岛的地质信息,推断了扬子块体和中朝块体在南黄海海域的界限。中朝和扬子块体在海上的分界位置为千里岩北缘断裂,向NE延伸到125°E后,折向NNW向并在36°N附近再次转为NE向进入朝鲜半岛并经过洪城南侧继续以NE向延伸。扬子的北缘为苏鲁造山带,穿过黄海与京畿造山带相接,苏鲁超高压变质带对应洪城杂岩。Abstract: Multi-source gravity data including shipborne gravity data, modern altimetry satellite gravity data and land measured gravity data as well as the Earth Gravity Model data are integrated into a unified gravity data set for the South Yellow Sea and adjacent areas. The features of Bouguer gravity anomalies of the South Yellow Sea are analyzed. Apparent density inversion based on interpolating cut method and iteration method for big distance downward continuation of potential field is applied to detect the tectonic boundary between Yangtze Block and Sino-Korea Block in the South Yellow Sea. Through the interpretation of apparent density slices at different depth and combined with geological information, we infer that the tectonic boundary between the two blocks in the sea area goes along the fault to the north of the Qianliyan uplift, then extends to the longitude of 125° along NE direction, turns to NNW and back to NE around the latitude of 36° and finally enters Korea Peninsula through the south of Hongsung in NE direction. The Sulu orogenic belt and the Gyeonggi orogenic belt make up the northern margin of the Yangtze Block. Sulu ultra-high pressure metamorphic belt could be compared with the Hongsung complex.
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