An ophiolitic tectonic melange first discovered in Huashan area, south margin of Qinling Orogenic Belt, and its tectonic implications |
| |
Authors: | Yunpeng Dong Guowei Zhang Shaocong Lai Dingwu Zhou Bingquan Zhu |
| |
Institution: | (1) Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640 Guanghou, China;(2) Department of Geology, Northwest University, 710069 Xi’an, China |
| |
Abstract: | On the basis of the synthetic studies of geology and geochemistry, an ophiolitic tectonic melange waa discovered in Sanligang-Sanyang
area, the western part of Xiangfan-Guangji fault, the south margin of the Qinling Orogenic Belt. It is composed of different
tectonic blocks with different lithological features and ages, mainly including the Huashan ophiolite blocks, Xiaofu Island-arc
volcanic blocks, pelagic sediments, fore-arc volcanic-sedimentary system, and the massif of the basement and the covering
strata of the Yangtze Block. These massifs were emplaced in the western part of Xiangfan-Guangji fault, the boundary between
the Qinling Orogenic Belt and Yangtze Block, contacting each other by a shear zone or chaotic matrix. The characteristics
of geochemistry indicate that the bash of the Huashan ophiolite are similar to mid-oceanic ridge basalts (MORB) formed in
an initial oceanic baain, and the Xiaofu volcanic rocks are formed in a tectonic setting of island arc. The ophiolitic tectonic
melange is the fragments of subduction wedge, which implies that there has been an oceanic basin between Qinling Block and
Yangtze Block.
Project supported by the National Natural Science Foundation of China (Grant Nos. 49773187, 49732080) |
| |
Keywords: | Qinllag Orogenic Belt Xiangfan-Guangji fault Huashan ophiolitic tectonic melange suture zone oceanic basin |
本文献已被 SpringerLink 等数据库收录! |
|