太行山重力梯度带的形成与华北岩石圈减薄的时空差异性有关

徐义刚

Volume 31 Issue 1

Jan. 2006

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XU Yi-gang, 2006. Formation of the Taihangshan Gravity Lineament by the Diachronous Lithospheric Thinning of the North China Craton. Earth Science, 31(1): 14-22.

Citation:

XU Yi-gang, 2006. Formation of the Taihangshan Gravity Lineament by the Diachronous Lithospheric Thinning of the North China Craton. Earth Science, 31(1): 14-22.

XU Yi-gang, 2006. Formation of the Taihangshan Gravity Lineament by the Diachronous Lithospheric Thinning of the North China Craton. Earth Science, 31(1): 14-22.

Citation:

XU Yi-gang, 2006. Formation of the Taihangshan Gravity Lineament by the Diachronous Lithospheric Thinning of the North China Craton. Earth Science, 31(1): 14-22.

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Formation of the Taihangshan Gravity Lineament by the Diachronous Lithospheric Thinning of the North China Craton

XU Yi-gang

Received Date: 2005-10-08
Publish Date: 2006-01-25

Abstract

Abstract

The comparison of Cenozoic basalts and their mantle xenoliths from both sides of the Taihangshan gravity lineament reveals that: (1) Cenozoic basalts from western and eastern North China display opposite temporal trends, suggesting lithospheric thinning in western North China during the Cenozoic and lithospheric thickening in eastern North China; (2) The lithospheric mantle in the west is mostly Late-Archean to Proterozoic in age, whereas that in the east has a modern age with minor Proterozoic age; (3) The crust-mantle transition in the west is considerably thicker than in the east, probably due to different extents of magmatic underplating. The spatial heterogeneity of the lithospheric mantle beneath North China may have resulted from the diachronous thinning processes. Paleogeographic data suggest the first occurrence of the Taihangshan gravity lineament was initially formed during the Early Cretaceous, which is coeval with the peak of Mesozoic mag-matism in this region. Given the fact that Mesozoic magmatism was closely related to the lithospheric thinning, it is proposed that the diachronous lithospheric thinning is the main mechanism by which the Taihangshan gravity lineament was formed.
- gravity lineament,
- lithospheric thinning,
- North China craton

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References(60)

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