The determination of peak temperature of eclogites in the west of Tieshiguan area, North Qaidam UHP of Qinghai Province, and its geological significance

CHEN Xin; XU Rongke; ZHENG Youye; WANG Yongkai; WANG Hongjun; BAI Jie; DU Wenyang; LU Rui

doi:10.12097/gbc.20151215

Geological Bulletin of China > 2015 > 34(12): 2292-2301. > DOI: 10.12097/gbc.20151215

CHEN Xin, XU Rongke, ZHENG Youye, WANG Yongkai, WANG Hongjun, BAI Jie, DU Wenyang, LU Rui. 2015: The determination of peak temperature of eclogites in the west of Tieshiguan area, North Qaidam UHP of Qinghai Province, and its geological significance. Geological Bulletin of China, 34(12): 2292-2301. DOI: 10.12097/gbc.20151215

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The determination of peak temperature of eclogites in the west of Tieshiguan area, North Qaidam UHP of Qinghai Province, and its geological significance

Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, Hubei, China; 2. Institute of Geological Survey, China University of Geosciences, Wuhan 430074, Hubei, China;3. College of Earth Sciences and Mineral Resources, China University of Geosciences, Beijing 100083, China;4. Geological Institute of Shougang Academy of Geology and Exploration, Beijing 100144, China

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Lots of eclogites have been found in the west of Tieshiguan, which has fulfilled the recognition of the ultrahigh pressure metamorphic belt between Yuqia and Xitie Mountain. The Yuqia ultrahigh pressure metamorphic belt extends southeastward for 40 kilometers. On the basis of geological features, petrography and mineralogy of eclogites in the west of Tieshiguan, the authors revealed that ultrahigh pressure metamorphic peak period mineral combination (garnet+omphacite+phengite+rutile) has been preserved. It is obviously of retrograde eclogites as shown by the petrographic analysis. The authors used mineralogical thermometer to measure the temperature of the ultrahigh pressure metamorphic peak period of west Tieshiguan, and the results show that the temperature and the pressure were 694-791℃ and 2.5-2.6GPa respectively. Garnet zoning shows that the temperature decreased from the core area to the edge, whereas the pressure increased from the core area to the mantle area and decreased from the mantle area to the edge, which suggests that eclogite went through a dynamic process of rapid subduction and low speed exhumation.
- eclogites,
- mineral thermometer,
- North Qaidam,
- west of Tieshiguan

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The determination of peak temperature of eclogites in the west of Tieshiguan area, North Qaidam UHP of Qinghai Province, and its geological significance

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The determination of peak temperature of eclogites in the west of Tieshiguan area, North Qaidam UHP of Qinghai Province, and its geological significance

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