From oblique accretion to transpression in the evolution of the Altaid collage: New insights from West Junggar,northwestern China |
| |
| Authors: | Flavien Choulet Michel Faure Dominique Cluzel Yan Chen Wei Lin Bo Wang |
| |
| Institution: | 1. State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing 210093, China;2. University of Florida, Department of Geological Sciences, 241 Williamson Hall, Gainesville, FL 32611, United States;1. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, Guizhou 550002, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. 216 Team, China National Nuclear Corporation, Urumqi 830011, China;4. Hunan Institute of Geological Survey, Changsha 410116, China;5. College of Earth Sciences, Guilin University of Technology, Guilin 541004, China |
| |
| Abstract: | Along active margins, tectonic features that develop in response to plate convergence are strongly controlled by subduction zone geometry. In West Junggar, a segment of the giant Palaeozoic collage of Central Asia, the West Karamay Unit represents a Carboniferous accretionary complex composed of fore-arc sedimentary rocks and ophiolitic mélanges. The occurrence of quasi-synchronous upright folds and folds with vertical axes suggests that transpression plays a significant role in the tectonic evolution of the West Junggar. Latest Carboniferous (ca. 300 Ma) alkaline plutons postdate this early phase of folding, which was synchronous with accretion of the Carboniferous complex. The Permian Dalabute sinistral fault overprints Carboniferous ductile shearing and split the West Karamay Unit ca. 100 km apart. Oblique convergence may have been provoked by the buckling of the Kazakh orocline and relative rotations between its segments. Depending upon the shape of the convergence zone, either upright folds and fold with vertical axes, or alternatively, strike–slip brittle faults developed in response to strain partitioning. Sinistral brittle faulting may account for the lateral imbrication of units in the West Junggar accretionary complex. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
