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Mineralogical Characteristics of Garnet in Garnet Mica Schist and Its Tectonic Significance in the Tongbai Section of the shangdan Fault Zone

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Open Journal of Geology 2015年第1期5卷 13-27页

作者： Shenglian Ren Chuanzhong Song Jiahao Li School of Resources and Environmental Engineering Hefei University of Technology Hefei China

Studies on the metamorphism and deformation conditions of rocks in the suture zone are good ways to discuss the orogenic process and mechanism. The microstructure and ultramicrostructure features of minerals are true embodiment of formation environment of the orogenic belt. Based on the study of microstructure, ultramicrostructure deformation characteristic and compositional zonation of garnets in garnets-mica schists in the Tongbai mountain, east section of the shangdan fault zone, the results show that the three types of garnets have suffered various states of plastic deformation. The dynamic recrystallization of garnets is due to the subgrain growth and boundary migration. The dislocations are mainly free dislocation and dislocation walls. The free dislocation density ρ = 6.14 × 108/cm2, and dislocation movement are mainly slips;slip planes are 1/2 {110} and {001}. Garnet microprobe analysis shows that it belongs to almandine, and reflects it has undergone epidote-amphibolite to amphibolite facies metamorphism. Compositional zonation of garnet shows that the rocks had experienced progressive metamorphism. First metamorphic environment was continuous temperature-pressure and in mid-term there were two non-synchronous transient cooling and decompression processes, and it finally underwent decompression and warming process of the thermal relaxation environment. The formation condition of garnet-mica schist is estimated: T = 562°C - 617°C, and P = 0.77 - 1.02 GPa. The differential stress is 0.511 GPa and strain rate is 4.97536 × 10-10 m/s. After systemic analysis, a conclusion is drawn that the plastic deformation mode, deformation mechanism and formation environment of garnets are closely related to the formation and development of the shangdan fault zone. It truly reflects that the shangdan fault zone, as the suture zone of Yangtze and north China plate, has been subjected to early medium-grade metamorphism. With the continuous compression after the collision, the

关键词： The Tongbai Area The shangdan Fault Zone Metamorphism and Deformation Compositional Zonation of Garnet Dislocation

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Characteristics of the Maoping sedimentary assemblage in the East Qinling, Central China and its tectonic implication

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Science China Earth Sciences 1996年第S1期39卷 69-79页

作者：于在平柳小明张成立孟庆任 Department of Geology Northwest University Xi'an 710069 China

Sedimentary setting of the metamorphic Maoping sedimentary assemblage is determined as Paleozoic Qinling island arc based on analysis of provenance, composition of detrital rocks and regional geology. The sedimentary assemblage is located in mid-east of the shangdan zone where initial local contact or collision between the South and North Qinling happened. The process of the integration between the South and North Qinling initiated at the beginning of Carboniferous and ended by the end of Middle Triassic. A long-term margional tectonic evolution occurred in the duration. This unique tectonic evolution of Qinling is suggested by the deformational succession and tectonic evolution developed in Maoping area.

关键词： Qinling shangdan zone sedimentary setting tectonic evolution collisionsl orogeny.

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