First report of eclogites from central Tibet,China: evidence for ultradeep continental subduction prior to the Cenozoic India‐Asian collision |
| |
| Authors: | Kai‐Jun Zhang Yu‐Xiu Zhang Xian‐Chun Tang Yao‐Wu Xie Shao‐Li Sha Xing‐Jie Peng |
| |
| Institution: | 1. Guangzhou Institute of Geochemistry, Chinese Academy of Science, Guangzhou 510640;2. Department of Earth Sciences, Nanjing University, Nanjing 210093;3. Research Center for Tibetan Plateau Geology and School of the Earth Sciences and Resources, China University of Geosciences at Beijing, Beijing 100083;4. Graduate School, Chinese Academy of Science, Beijing 100008;5. Geological Survey of Tibet, Lhasa 851400;6. Third Geological Survey, Yunnan Bureau of Geology and Mineral Resources, Kunming 671000, China |
| |
| Abstract: | Eclogites characterized by a garnet + clinopyroxene + orthopyroxene + sanidine + rutile assemblage are reported for the first time in the eastern Bangong suture, central Tibet (China). Garnet and sanidine are exsolved from clinopyroxene. Al‐exchange barometer for orthopyroxene and garnet and K concentrations in clinopyroxene indicate a peak pressure of ～4 GPa. The occurrence of these ultrahigh‐pressure rocks implies the subduction of continental crust to a depth of >130 km along the eastern Bangong suture zone during the Early Jurassic. The denudation of these ultrahigh‐pressure metamorphic rocks could have provided a significant source for the Jurassic turbidites in the western Bangong ocean basin. |
| |
| Keywords: | |
|
|
