西准噶尔及邻区的岩石圈密度结构特征及其构造意义

许顺芳; 陈超; 杜劲松; 孙石达; 胡正旺

doi:10.3799/dqkx.2015.140

Volume 40 Issue 9

Sep. 2015

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Article Navigation > Earth Science > 2015 > 40(9): 1556-1565

Xu Shunfang, Chen Chao, Du Jinsong, Sun Shida, Hu Zhengwang, 2015. Characteristics and Tectonic Implications of Lithospheric Density Structures beneath Western Junggar and Its Surroundings. Earth Science, 40(9): 1556-1565. doi: 10.3799/dqkx.2015.140

Citation:

Xu Shunfang, Chen Chao, Du Jinsong, Sun Shida, Hu Zhengwang, 2015. Characteristics and Tectonic Implications of Lithospheric Density Structures beneath Western Junggar and Its Surroundings. Earth Science, 40(9): 1556-1565. doi: 10.3799/dqkx.2015.140

Citation:

Xu Shunfang, Chen Chao, Du Jinsong, Sun Shida, Hu Zhengwang, 2015. Characteristics and Tectonic Implications of Lithospheric Density Structures beneath Western Junggar and Its Surroundings. Earth Science, 40(9): 1556-1565. doi: 10.3799/dqkx.2015.140

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Characteristics and Tectonic Implications of Lithospheric Density Structures beneath Western Junggar and Its Surroundings

doi: 10.3799/dqkx.2015.140

Xu Shunfang^{1, 2
,},
Chen Chao^{1, 2
,
,},
Du Jinsong¹,
Sun Shida¹,
Hu Zhengwang^{1, 2}

1.
Institute of Geophysics & Geomatics, China University of Geosciences, Wuhan 430074, China
2.
Hubei Key Laboratory of Subsurface Multi-scale Imaging, China University of Geosciences, Wuhan 430074, China

Received Date: 2015-05-05
Publish Date: 2015-09-15

Abstract

Abstract

Structures in the crust and uppermost mantle beneath western Junggar and its surroundings, the key to better understanding of the tectonic evolution of the Junggar basin, are studied in this paper. Firstly, the Bouguer gravity anomaly is calculated from the satellite gravitational field model. Then 3D inversion technique is utilized, and the density imaging is operated in the crust and uppermost mantle beneath the western Junggar and its surroundings and finally the anomalous density structure at the depth range of 0-80 km is obtained. Crustal density distribution in the ancient oceanic crust of the Junggar indicates the possible subductions under the Siberian plate northeastwardly and the western Junggar northwestwardly. Density distribution in the uppermost mantle suggests that the relatively low density beneath Altay fold belt may have resulted from the thick sialic layer of the ancient continent, and Kazakhstan plate & Junggar basin are dominated by a relatively whole high-density structure while the significant density changes beneath the Tianshan fold belt describe the ultra-crustal deep faults and also the nicks of the tectonic activities and the lithospheric deformations.
- western Junggar,
- satellite gravity,
- Bouguer gravity anomaly,
- density imaging,
- lithospheric density structure,
- tectonics,
- geophysics

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References(72)

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Characteristics and Tectonic Implications of Lithospheric Density Structures beneath Western Junggar and Its Surroundings

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