Diamonds recovered from peridotite of the Purang ophiolite in the Yarlung-Zangbo suture of Tibet A proposal for a new type of diamond occurrence

CORC > 中国地质调查局 > 中国地质调查局

	Diamonds recovered from peridotite of the Purang ophiolite in the Yarlung-Zangbo suture of Tibet A proposal for a new type of diamond occurrence
	Yang, JS (Yang JingSui); Xu, XZ (Xu XiangZhen); Li, Y (Li Yuan); Li, JY (Li JinYang); Ba, DZ (Ba DengZhu); Rong, H (Rong He); Zhang, ZM (Zhang ZhongMing)
刊名	ACTA PETROLOGICA SINICA
	2011
卷号	27 期号:11 特刊 SI 页码:3171-3178
关键词	Diamond Ophiolite Peridotite Purang Yarlung-Zangbo suture zone
ISSN号	1000-0569
英文摘要	After the discovery of diamonds and other unusual minerals in peridotites and chromitites of the Luobusa ophiolite, Tibet, it became important to determine if this was an isolated occurrence or if the same minerals occur in other ophiolites of the Yarlung-Zangho suture zone. Here, we report the discovery of a similar collection of minerals in mantle peridotites of the Purang ophiolite, which lies in the westernmost part of the Yarlung-Zangbo suture, more than 1000km from the Luobusa massif. The Purang ophiohte consists mainly of harzburgite, lherzolite and dunite, probably of MOR type, which were modified in a SSZ environment. Many grains of diamond and some unusual minerals, such as moissanite, were recovered by standard mineral separation techniques from a 657kg sample of harzburgite. The presence of native Cr, Fe and Zn, together with the moissanite, indicates a strongly reducing environment. This discovery confirms that the Luobusa massif is not unique in the Yarlung-Zangbo suture. Based on the presence of similar minerals in the Ray-Iz ophiolite of the Polar Urals. and reports of diamonds in Alpine-type mantle peridotites, we suggest that diamonds and highly reduced minerals may be common in ophiolitic peridotites. These occurrences indicate a completely new environment for diamond formation, which can be regarded as ophiolite-type diamond, distinct from the other two well known types, i. e. kimberlitic diamonds and ultrahigh pressure metamorphic diamonds.
学科主题	火成岩岩石学
WOS关键词	LUOBUSA OPHIOLITE ; GRAPHITIZED DIAMONDS ; PODIFORM CHROMITITES ; SOUTHERN TIBET ; HIGH-PRESSURE ; TEMPERATURE ; COESITE ; MASSIF ; RUTILE
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000297822900002
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39410]
专题	中国地质调查局
作者单位	Chinese Acad Geol Sci, Inst Geol, State Key Lab Continental Tecton & Dynam, Beijing 100037, Peoples R China
推荐引用方式 GB/T 7714	Yang, JS ,Xu, XZ ,Li, Y ,et al. Diamonds recovered from peridotite of the Purang ophiolite in the Yarlung-Zangbo suture of Tibet A proposal for a new type of diamond occurrence[J]. ACTA PETROLOGICA SINICA,2011,27(11 特刊 SI):3171-3178.
APA	Yang, JS .,Xu, XZ .,Li, Y .,Li, JY .,Ba, DZ .,...&Zhang, ZM .(2011).Diamonds recovered from peridotite of the Purang ophiolite in the Yarlung-Zangbo suture of Tibet A proposal for a new type of diamond occurrence.ACTA PETROLOGICA SINICA,27(11 特刊 SI),3171-3178.
MLA	Yang, JS ,et al."Diamonds recovered from peridotite of the Purang ophiolite in the Yarlung-Zangbo suture of Tibet A proposal for a new type of diamond occurrence".ACTA PETROLOGICA SINICA 27.11 特刊 SI(2011):3171-3178.