拉脊山-化隆变质核杂岩构造及其隆升机制探讨

张旺生; 冯光胜; 高山; 孙林华

Volume 28 Issue 4

Jul. 2003

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Article Navigation > Earth Science > 2003 > 28(4): 407-413

ZHANG Wang-sheng, FENG Guang-sheng, GAO Shan, SUN Lin-hua, 2003. Metamorphic Core Complex Structure and Uplifting Mechanism in Lajishan-Hualong Area. Earth Science, 28(4): 407-413.

Citation:

ZHANG Wang-sheng, FENG Guang-sheng, GAO Shan, SUN Lin-hua, 2003. Metamorphic Core Complex Structure and Uplifting Mechanism in Lajishan-Hualong Area. Earth Science, 28(4): 407-413.

ZHANG Wang-sheng, FENG Guang-sheng, GAO Shan, SUN Lin-hua, 2003. Metamorphic Core Complex Structure and Uplifting Mechanism in Lajishan-Hualong Area. Earth Science, 28(4): 407-413.

Citation:

ZHANG Wang-sheng, FENG Guang-sheng, GAO Shan, SUN Lin-hua, 2003. Metamorphic Core Complex Structure and Uplifting Mechanism in Lajishan-Hualong Area. Earth Science, 28(4): 407-413.

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Metamorphic Core Complex Structure and Uplifting Mechanism in Lajishan-Hualong Area

Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China

Received Date: 2003-04-18
Publish Date: 2003-07-25

Abstract

Abstract

This paper studies the metamorphic core complex in Lajishan-Hualong area, middle Qilian. Its core consists of Archeozoic and Proterozoic Hualong Group metamorphic complexes undergoing ductile deformation, with its median layers, Middle-Upper Cambrian and mass of magmatic rocks undergoing plastic deformation of low-pressure metamorphism, and overlayers, Lower Cretaceous experiencing minor brittle deformation without metamorphism. The composition and texture of the metamorphic core complex show features of symmetrical extension and uplifting and a rapid uplifting period within 23 to 32 Ma and displacement quantity of normal denudational faults about 25-27 kilometres. The mineral pair calculation measures its extensional metamorphic temperature about 625-630 ℃, the metamorphic depth about 20 km and the metamorphic pressure about 0.63 GPa, which shows that it should belong to a regional thermal current metamorphism of low-pressure type. In the light of long run thermal crustal, thermal mantle, thick crustal evolution and tectonics upwelling of the Qinghai-Tibet plateau, the Lajishan-Hualong metamorphic core complex can be considered as a typical example of crust extension caused by thermal upwelling of mantle. The Lajishan-Hualong area can, therefore, become a window to look into the structure and tectonic upwelling of the Qinghai-Tibet plateau lithosphere.
- metamorphic core complex,
- thermal upwelling,
- extensional tectonic,
- Lajishan

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References(25)

References

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