STRUCTURAL FEATURES AND TECTONIC EVOLUTION OF THE WEI-ZI-LUO FAULT ZONE IN SOUTHWESTERN GUIZHOU PROVINCE

ZHANG Rong-qiang; ZHOU Yan; WANG Xin-wei; LI Shuang-jian; LI Song

Volume 15 Issue 2

Jun. 2009

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Article Navigation > Journal of Geomechanics > 2009 > 15(2): 178-189

ZHANG Rong-qiang, ZHOU Yan, WANG Xin-wei, et al., 2009. STRUCTURAL FEATURES AND TECTONIC EVOLUTION OF THE WEI-ZI-LUO FAULT ZONE IN SOUTHWESTERN GUIZHOU PROVINCE. Journal of Geomechanics, 15 (2): 178-189.

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STRUCTURAL FEATURES AND TECTONIC EVOLUTION OF THE WEI-ZI-LUO FAULT ZONE IN SOUTHWESTERN GUIZHOU PROVINCE

Research Institute of Exploration & Production, SIONPEC, Beijing 100083, China

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Abstract

Abstract

The Wei-Zi-Luo fault develops in southwestern margin of the Yangtze block. This is a deep crustal fault zone and controls the deposition and deformation styles of the region. Based on detailed field observations, fluid inclusion analysis and temperature measurements, and using cross section balance, this paper describes structural texture and segmentation feature of the fault zone and discusses its tectonic evolution. The results show that the Wei-Zi-Luo fault zone consists of several segments with kinematics dominated by reverse and sinistral strike-slip motion.Fluid inclusion analysis indicates brittle environment of deformation occurring in the upper crust, with temperature less than 200 ℃. Restoration of cross section shows that this fault zone was under extension during the Early Devonian to Middle Triassic, which controlled the depositional sequence of the region. It was deformed during the Indosinian orogen at the end of Triassic. The major deformation phase, related to westward push of the South China Block, occurred in Late Jurassic to Early Cretaceous.
- Wei-Zi-Luo fault zone,
- fault texture,
- geological fluids,
- inclusions temperature measurements,
- Indisinian tectonic movement,
- Early Yanshanian tectonuic movement

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