Three-dimensional lithospheric density distribution of China and surrounding regions

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• 作者：Chuantao Li ; Guibin Zhang ; Xinsheng Wang ; Zhengkai Wang ; Jian Fang
• 关键词：Asian lithosphere ; Residual Bouguer gravity anomaly ; Inversion ; Three-dimensional lithospheric density structure
• 刊名：Geoscience Frontiers
• 出版年：January, 2014
• 年：2014
• 卷：5
• 期：1
• 页码：95-102
• 全文大小：3913 K

文摘

In this paper, we analyze lithospheric density distribution of China and surrounding regions on the basis of 30鈥猜犆椔?0鈥?gravity data and 1掳聽脳聽1掳 P-wave velocity data. Firstly, we used the empirical equation between the density and the P-wave velocity difference as the base of the initial model of the Asian lithospheric density. Secondly, we calculated the gravity anomaly, caused by the Moho discontinuity and the sedimentary layer discontinuity, by the Parker formula. Thirdly, the gravity anomaly of the spherical harmonics with 2-40 order for the anomalous body below the lithosphere is calculated based on the model of EGM96. Finally, by using Algebra Reconstruction Techniques (ART), the inversion of 30鈥猜犆椔?0鈥?residual lithospheric Bouguer gravity anomaly caused by the lithosphere yields a rather detailed structural model. The results show that the lithospheric density distribution of China and surrounding regions has a certain connection with the tectonic structure. The density is relatively high in the Philippine Sea plate, Japan Sea, the Indian plate, the Kazakhstan shield and the Western Siberia plain, whereas the Tibetan Plateau has low-density characteristics. The minimum value of density lies in the north of Philippines, in the Taiwan province and in the Ryukyu island arc.