Middle to Late Triassic granitoids in the Qimantage area, Qinghai;Province, China: Chronology, geochemistry and metallogenic;significances.

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	Middle to Late Triassic granitoids in the Qimantage area, Qinghai;Province, China: Chronology, geochemistry and metallogenic;significances.
	Feng ChengYou 4; Wang Song ; Li GuoChen ; Ma ShengChao ; Li DongSheng
刊名	ACTA PETROLOGICA SINICA
	2012
卷号	28 期号:2 页码:665-678
关键词	Granitoids Geochemistry Geochronology Middle to Late Triassic Post-collisional environment Qimantage Eastern Kunlun
ISSN号	914ZD
英文摘要	The Qimantage area, located on the southwestern margin of Qaidam Basin, is not only a characteristic intrusive magmatic tectonic belt, but also a very important poly-metallic metallogenic belt. In this paper, detailed geochronological, element geochemical, Sr-Nd-Pb isotopic studies were carried out for the Middle to Lite Triassic granitoids, and relationship between granitoids and polymetallic mineralization was discussed. The Middle to Late Triassic granitoids in Qimantage area are characterized by the metaluminous to peraluminous and high-K calc-alkaline rocks. Of them, the Late Triassic granitoids is much enriched in K2O/Na2O ratio, LILE and LREE, and poor in HFSE. The rocks exhibit moderate initial Sr-87/Sr-86 values and comparatively negative epsilon(Nd)(t) values, which indicate that they were derived from ancient crust sources and mixed probably by mantle material. The precise U-Pb zircon dating results define emplacement of the mianthite-riched granodiorite occurred during 230 similar to 237Ma, Late Triassic porphyritic granitiods intruded at 228 similar to 204Ma. It is inferred that the tectonic transformation from crustal compression to extension was produced at about 240Ma, and was accompanied by mantle source magmatism. The occurrence of Late Triassic high differentiated and high-K calc-alkaline granitoids indicates that this area had evolved into post-collisional environment. The large numbers of porphyry and skarn-type poly-metallic deposits are temporally and spatially related to Middle to Late Triassic granitic intrusions.
学科主题	火成岩岩石学
WOS关键词	I-TYPE ; KUNLUN ; ROCKS
WOS研究方向	Geology
语种	中文
WOS记录号	WOS:000301991500024
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39545]
专题	中国地质科学院矿产资源研究所
作者单位	1.CAGS, Inst Mineral Resources, MLR Key Lab Metallogeny & Mineral Resource Assess, Beijing 100037, Peoples R China. 2.China Coal Geology Engn Corp, Beijing 100073, Peoples R China. 3.Third Inst Qinghai Geol Mineral Prospecting, Xining 810029, Peoples R China. 4.中国地质科学院矿产资源研究所
推荐引用方式 GB/T 7714	Feng ChengYou,Wang Song,Li GuoChen,et al. Middle to Late Triassic granitoids in the Qimantage area, Qinghai;Province, China: Chronology, geochemistry and metallogenic;significances.[J]. ACTA PETROLOGICA SINICA,2012,28(2):665-678.
APA	Feng ChengYou,Wang Song,Li GuoChen,Ma ShengChao,&Li DongSheng.(2012).Middle to Late Triassic granitoids in the Qimantage area, Qinghai;Province, China: Chronology, geochemistry and metallogenic;significances..ACTA PETROLOGICA SINICA,28(2),665-678.
MLA	Feng ChengYou,et al."Middle to Late Triassic granitoids in the Qimantage area, Qinghai;Province, China: Chronology, geochemistry and metallogenic;significances.".ACTA PETROLOGICA SINICA 28.2(2012):665-678.