BAIDUNZI-XIAOXUGONG DUCTILE SHEAR ZONE AND ITS ORE-CONTROLLING EFFECT IN THE SOUTHERN BEISHAN AREA, GANSU

CHEN Bai-lin; WU Gan-guo; YANG Nong; YE De-jin; SHU Bin; LIU Xiao-chun

Volume 13 Issue 2

Jun. 2007

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Article Navigation > Journal of Geomechanics > 2007 > 13(2): 99-109

CHEN Bai-lin, WU Gan-guo, YANG Nong, et al., 2007. BAIDUNZI-XIAOXUGONG DUCTILE SHEAR ZONE AND ITS ORE-CONTROLLING EFFECT IN THE SOUTHERN BEISHAN AREA, GANSU. Journal of Geomechanics, 13 (2): 99-109.

Citation:

CHEN Bai-lin, WU Gan-guo, YANG Nong, et al., 2007. BAIDUNZI-XIAOXUGONG DUCTILE SHEAR ZONE AND ITS ORE-CONTROLLING EFFECT IN THE SOUTHERN BEISHAN AREA, GANSU. Journal of Geomechanics, 13 (2): 99-109.

Citation:

CHEN Bai-lin, WU Gan-guo, YANG Nong, et al., 2007. BAIDUNZI-XIAOXUGONG DUCTILE SHEAR ZONE AND ITS ORE-CONTROLLING EFFECT IN THE SOUTHERN BEISHAN AREA, GANSU. Journal of Geomechanics, 13 (2): 99-109.

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BAIDUNZI-XIAOXUGONG DUCTILE SHEAR ZONE AND ITS ORE-CONTROLLING EFFECT IN THE SOUTHERN BEISHAN AREA, GANSU

1.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081
2.
China University of Geosciences, Beijing 100083
3.
Gansu Institute of Geological Survey, Lanzhou 730000, Gansu

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Received: 2007-02-16
Published: 2007-06-01

Abstract

Abstract

The Baidunzi-Xiaoxigong ductile shear zone, as the southernmost one of the eight ductile shear zones in the Beishan area, Gansu, is situated at the southern border of the southern Beishan area and near the northern border of the Dunhuang massif.It extents in a nearly E-W direction with a length of 160 km and a width of 5-8 km.This shear zone is characterized by subhorizontal dextral shear and formed under the conditions of low-middle to middle-slightly high temperatures and relatively low differential structural stresses (53-106 MPa).The principal strain (Rxz)is 4-20, the shear strain (γ)is 1.41-2.42 and the shear displacement is up to 10-25 km.The ductile shear zone has a marked controlling effect on gold deposits:it controls the distribution of gold deposits (occurrences)on a regional scale and the shape, attitude and size of gold mineralization zones and orebodies on a deposit scale.The features of transpressional ductile deformation determine that gold mineralization is mainly of altered mylonite type and that alteration is featured by metasomatism.Gold mineralization occurred a little later than ductile shear deformation.
- ductile shear zone,
- deformation,
- ore-controlling effect,
- Baidunzi-Xiaoxigong area,
- Gansu province

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References(26)

References

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