平南幔源包体中橄榄石的显微构造研究及其意义

孔华; 马芳; 金振民; 欧新功

Volume 26 Issue 1

Jan. 2001

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KONG Hua, MA Fang, JIN Zhen-min, OU Xin-gong, 2001. OLIVINE MICROSTRUCTURES FROM MANTLE-DERIVED XENOLITH IN PINGNAN COUNTY, GUANGXI. Earth Science, 26(1): 7-12.

Citation:

KONG Hua, MA Fang, JIN Zhen-min, OU Xin-gong, 2001. OLIVINE MICROSTRUCTURES FROM MANTLE-DERIVED XENOLITH IN PINGNAN COUNTY, GUANGXI. Earth Science, 26(1): 7-12.

KONG Hua, MA Fang, JIN Zhen-min, OU Xin-gong, 2001. OLIVINE MICROSTRUCTURES FROM MANTLE-DERIVED XENOLITH IN PINGNAN COUNTY, GUANGXI. Earth Science, 26(1): 7-12.

Citation:

KONG Hua, MA Fang, JIN Zhen-min, OU Xin-gong, 2001. OLIVINE MICROSTRUCTURES FROM MANTLE-DERIVED XENOLITH IN PINGNAN COUNTY, GUANGXI. Earth Science, 26(1): 7-12.

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OLIVINE MICROSTRUCTURES FROM MANTLE-DERIVED XENOLITH IN PINGNAN COUNTY, GUANGXI

1.
Department ofGeology, Central-South University of Technology, Changsha 410083, Chin
2.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
3.
Department of Geology, Peking University, Beijing 100871, China

Received Date: 2000-05-11
Publish Date: 2001-01-25

Abstract

Abstract

The equilibrium temperature of the mantle-derived spinel lherzolite xenolith in the basalt in Pingnan County, Guangxi lies between 930 and 980 ℃, and its corresponding equilibrium depth between 59 and 74 km. The kink-band sliding system of the olivine in the mantle-derived xenolith is often (010) [100], but sometimes (001) [100]. However, the kink-band sliding system of orthopyroxene is (100) [001]. All these sliding systems occurred both at the high temperature and at the low strain rate, indicating that the upper mantle of the region experienced the plastic deformation both at the high temperature and at the low strain rate. Varieties of dislocations are present in the olivine, such as free dislocation, dislocation wall, dislocation bow, tangle, and (110) sliding system, indicating the plastic deformation features of the upper mantle. The size of the dislocation is used to estimate the following features of the upper mantle: the differential flow stress 24.5-42.1 MPa, the flow rate 2.93×10^-17 -8.36×10^-16s^-1, the effective viscosity η 1.72×10²³-2.80×10²⁴ Pa·s. All these upper-mantle features are in agreement with those in the Cenozoic eastern China, showing that they both occurred in the same tensile environment.
- spinel lherzolite xenolith,
- upper mantle,
- dislocation,
- Pingnan

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References(20)

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