塔里木盆地东北部磁性基底深度及构造属性

匡星涛; 宁方馨; 肖梦楚; 朱晓颖; 徐曦

doi:10.3799/dqkx.2022.434

Volume 48 Issue 4

Apr. 2023

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Article Navigation > Earth Science > 2023 > 48(4): 1351-1365

Kuang Xingtao, Ning Fangxin, Xiao Mengchu, Zhu Xiaoying, Xu Xi, 2023. Depth and Tectonic Properties of Magnetic Basement in Northeastern Tarim Basin. Earth Science, 48(4): 1351-1365. doi: 10.3799/dqkx.2022.434

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Kuang Xingtao, Ning Fangxin, Xiao Mengchu, Zhu Xiaoying, Xu Xi, 2023. Depth and Tectonic Properties of Magnetic Basement in Northeastern Tarim Basin. Earth Science, 48(4): 1351-1365. doi: 10.3799/dqkx.2022.434

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Depth and Tectonic Properties of Magnetic Basement in Northeastern Tarim Basin

doi: 10.3799/dqkx.2022.434

China Aero Geophysical Survey and Remote Sensing Center for Natural Resources, Beijing 100083, China

Received Date: 2022-05-31
Publish Date: 2023-04-25

Abstract

Abstract

In order to explore the depth and properties of magnetic basement in northeastern Tarim basin and its indication for tectonic attributes, based on the latest high-precision aeromagnetic data, the minimum buried depth of magnetic body in northeastern Tarim basin was calculated by using section tangent method, and the magnetic basement depth map was drawn. The results show that the depth of magnetic basement in most areas of northeastern Tarim basin is approximate to the depth of bottom boundary of sedimentary cover in seismic exploration, indicating that the calculation results of tangent method have high reliability. However, in the northern edge of Tadong uplift, the magnetic basement fluctuates greatly, and the depth is obviously different from that of sedimentary cover layer. Based on the analysis of the magnetic basement depth map, combining the high-precision Bouguer gravity anomaly and seismic interpretation profile, the tectonic attributes of the Tadong uplift and Kongquehe slope are interpreted. The obviously long-wave magnetic anomaly gradient zone, the low gravity, the highly variable magnetic basement depth, combining a large number of the Paleoproterozoic metamorphic granite samples in borehole, indicate that Tadong uplift may be the most important Precambrian structural boundary. The gravity and magnetic anomalies in Kongquehe slope show obviously negative correlation. Based on the spatial structure relations of magnetic basement, the Nanhua-Sinian sedimentary thickness and gravity-magnetic anomalies, and the magnetic characteristics of the rock, etc., in this study it suggests that the Neoproterozoic rift event may reduce the magnetism of the basement, on the contrary, the crust of the central and southern region of northern depression which was not affected by the rifting, still retains the strong magnetic characteristics.
- aeromagnetic anomalies,
- magnetic basement,
- Tadong uplift,
- tectonic boundary,
- Kongquehe slope,
- Neoproterozoic rift,

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Depth and Tectonic Properties of Magnetic Basement in Northeastern Tarim Basin

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