中国大陆科学钻探主孔正片麻岩磁性及深部流体活动

曾庆理; 刘庆生; 郑建平; 刘志峰; 王红才

doi:10.3799/dqkx.2014.176

Volume 39 Issue 12

Dec. 2014

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Zeng Qingli, Liu Qingsheng, Zheng Jianping, Liu Zhifeng, Wang Hongcai, 2014. Magnetism of Granitic Gneiss from Chinese Continental Scientific Drilling Main Hole and Fluid Activities. Earth Science, 39(12): 1915-1926. doi: 10.3799/dqkx.2014.176

Citation:

Zeng Qingli, Liu Qingsheng, Zheng Jianping, Liu Zhifeng, Wang Hongcai, 2014. Magnetism of Granitic Gneiss from Chinese Continental Scientific Drilling Main Hole and Fluid Activities. Earth Science, 39(12): 1915-1926. doi: 10.3799/dqkx.2014.176

Citation:

Zeng Qingli, Liu Qingsheng, Zheng Jianping, Liu Zhifeng, Wang Hongcai, 2014. Magnetism of Granitic Gneiss from Chinese Continental Scientific Drilling Main Hole and Fluid Activities. Earth Science, 39(12): 1915-1926. doi: 10.3799/dqkx.2014.176

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Magnetism of Granitic Gneiss from Chinese Continental Scientific Drilling Main Hole and Fluid Activities

doi: 10.3799/dqkx.2014.176

1.
Institute of Geophysics & Geomatics, China University of Geosciences, Wuhan 430074, China
2.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
3.
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
4.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China

Received Date: 2014-01-03
Publish Date: 2014-12-01

Abstract

Abstract

Detailed magnetic studies and mineralogy analysis show that the granitic gneiss has the second highest (only second to the serpentinized garnet peridotite) low-field susceptibility (χ) (0.570×10^-7-120.450×10^-7m³·kg^-1, average 29.996×10^-7m³·kg^-1) and the lowest natural remanent magnetization (NRM) (0.002×10^-3-2.109×10^-3Am²·kg^-1, average 0.210×10^-3Am²·kg^-1). Temperature dependence of magnetic susceptibility, alternating field (AF) demagnetization and magnetic hysteresis properties suggest that the magnetic minerals in granitic gneiss are magnetite ± hematite, the magnetites are mainly multi-domain (MD), pseudo-single domain (PSD) magnetites are also presented in small amounts. The grain size of magnetites are obviously larger than that in the completely retrograded eclogites, which have the same magnetic mineral assemblage and experienced amphibolite facies retrograde metamorphism. The formation of MD magnetites are thought to be related with stronger fluid activities during the retrogression. Samples occurring out of the major gneiss subunit and adjacent to the eclogites, which have related high NRM, may reflect fluid movements between felsic and mafic UHPM rocks.
- granitic gneiss,
- CCSD main hole,
- rock magnetism,
- fluid activity,
- geomagnetism

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References

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