Ultra-deep subduction of Yematan eclogite in the North Qaidam UHP belt,   NW China: Evidence from phengite exsolution in omphacite

doi:10.2138/am-2015-4899

CORC > 北京大学 > 地球与空间科学学院

	Ultra-deep subduction of Yematan eclogite in the North Qaidam UHP belt, NW China: Evidence from phengite exsolution in omphacite
	Han, Lei ; Zhang, Lifei ; Zhangi, Guibin
刊名	AMERICAN MINERALOGIST
	2015
关键词	Phengite exsolution eclogite ultra-deep subduction North Qaidam China COESITE-BEARING ECLOGITE HIGH-PRESSURE GARNET-PERIDOTITE METAMORPHIC ROCKS KOKCHETAV MASSIF UPPER-MANTLE WATER-CONTENT DABIE SHAN CLINOPYROXENE POTASSIUM
DOI	10.2138/am-2015-4899
英文摘要	Phengite exsolution in omphacite from the Yematan eclogite, North Qaidam UHP belt, NW China, is described. Mineralogical investigations show that the precursor omphacite in the Yematan eclogite contains up to 1.16 wt% K2O and similar to 10000 ppm H2O. Experimental studies document this omphacite to be formed at pressures higher than 6 GPa (at 900 degrees C). The pressure-temperature conditions of 3.68 GPa and 892 degrees C for phengite exsolution in omphacite associated with garnet during the exhumation were obtained by using Grt-Omp-Ph geothermobarometer. We conclude that omphacitic-clinopyroxene in subducted eclogites may act as a robust medium to transport H2O and potassium deep into the interior of the Earth. This study suggests that the Yematan eclogite in North Qaidam UHP metamorphic belt, NW China, may have been subducted and exhumed from depths of more than 200 km.; Major State Basic Research Development Program [2015CB856105]; National Science Foundation of China [41121062, 41272069, 41272068, 410090371]; SCI(E); ARTICLE; lfzhang@pku.edu.cn; 8-9; 1848-1855; 100
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/417661]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Han, Lei,Zhang, Lifei,Zhangi, Guibin. Ultra-deep subduction of Yematan eclogite in the North Qaidam UHP belt, NW China: Evidence from phengite exsolution in omphacite[J]. AMERICAN MINERALOGIST,2015.
APA	Han, Lei,Zhang, Lifei,&Zhangi, Guibin.(2015).Ultra-deep subduction of Yematan eclogite in the North Qaidam UHP belt, NW China: Evidence from phengite exsolution in omphacite.AMERICAN MINERALOGIST.
MLA	Han, Lei,et al."Ultra-deep subduction of Yematan eclogite in the North Qaidam UHP belt, NW China: Evidence from phengite exsolution in omphacite".AMERICAN MINERALOGIST (2015).