MAGNETIC FABRICS OF CENOZOIC SEDIMENTARY ROCKS IN THE WESTERN QAIDAM BASIN AND THEIR STRUCTURAL SIGNIFICANCE

LI Li; JIANG Rong-bao; QI Wan-xiu; WU Yi-ping; YANG Yi; LI Xue-zhi; CHEN Zheng-le; CHEN Xuan-hua; WANG Xiao-feng; REN Xiao-juan

Volume 14 Issue 1

Mar. 2008

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LI Li, JIANG Rong-bao, QI Wan-xiu, et al., 2008. MAGNETIC FABRICS OF CENOZOIC SEDIMENTARY ROCKS IN THE WESTERN QAIDAM BASIN AND THEIR STRUCTURAL SIGNIFICANCE. Journal of Geomechanics, 14 (1): 45-56.

Citation:

LI Li, JIANG Rong-bao, QI Wan-xiu, et al., 2008. MAGNETIC FABRICS OF CENOZOIC SEDIMENTARY ROCKS IN THE WESTERN QAIDAM BASIN AND THEIR STRUCTURAL SIGNIFICANCE. Journal of Geomechanics, 14 (1): 45-56.

Citation:

LI Li, JIANG Rong-bao, QI Wan-xiu, et al., 2008. MAGNETIC FABRICS OF CENOZOIC SEDIMENTARY ROCKS IN THE WESTERN QAIDAM BASIN AND THEIR STRUCTURAL SIGNIFICANCE. Journal of Geomechanics, 14 (1): 45-56.

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MAGNETIC FABRICS OF CENOZOIC SEDIMENTARY ROCKS IN THE WESTERN QAIDAM BASIN AND THEIR STRUCTURAL SIGNIFICANCE

1.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
2.
No.1 Geological Survey Office, Xinjiang Institute of Geological Survey, Urumqi 830011, Xinjiang, China

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Received: 2007-10-15
Published: 2008-03-01

Abstract

Abstract

Magnetic fabric analysis of Cenozoic sedimentary rocks in the vicinity of Shizigou, western Qaidam basin, shows that the magnetic fabrics are characterized by well-developed magnetic foliation, undeveloped magnetic lineation and a flattened magnetic susceptibility ellipsoid, and the P value symbolizing the degree of magnetic susceptibility anisotropy is low, suggesting that ductile deformation is relatively weak. The stress state reflected by the rock magnetic fabric is mainly manifested by NE compression, which is consistent with the arrangement of the anticlines with axes running NW. The magnetic fabrics in the area mostly have the features of primary sedimentary fabrics, with the magnetic foliations largely reflecting the bedding of sedimentary rocks and also recording the signs of NE compression. According to the relation between the magnetic fabrics of rocks and bedding of strata, the Shizigou anticline with two asymmetric limbs in the western Qaidam basin has the nature of a faultpropagation fold and its formation was due to the southwestward obduction of the Huatugou fault underneath.
- western Qaidam Basin,
- Cenozoic,
- magnetic fabric,
- structural deformation

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References(36)

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