Geochemistry of the Late Jurassic granitoids in the northern end area of   Da Hinggan Mountains and their geological and prospecting implications

CORC > 北京大学 > 地球与空间科学学院

	Geochemistry of the Late Jurassic granitoids in the northern end area of Da Hinggan Mountains and their geological and prospecting implications
	Wu Guang ; Chen YanJing ; Sun FenYue ; Li JingChun ; Li ZhiTong ; Wang XiJin
刊名	岩石学报
	2008
关键词	adakite geochemistry Late Jurassic collisional crust thickening Da Hinggan Mountains UNDERPLATED BASALTIC CRUST ADAKITIC INTRUSIVE ROCKS NORTHEASTERN CHINA ISOTOPIC COMPOSITIONS CONTINENTAL-CRUST COLLISIONAL BELT EASTERN CHINA PARTIAL MELTS MAGMAS CONSTRAINTS
英文摘要	The Late Jurassic Longgouhe and Ershiyizhan intrusions, located in the Upper Heilongjiang Basin of northern Da Hinggan Mountains, are closely related to the porphyry Cu-Au mineralizations.. The intrusions are mainly composed of quartz diorite, quartz monzodiorite and granodiorite. Most of them are the rocks of high-K calc-alkaline series, with minor of shoshonite series. Their SiO2 and Al2O3 contents range 61.37% similar to 66.59% and 15.35% similar to 17.06%, respectively. The MgO content ranges 2.02% similar to 3.47%, with a high Mg-# index ranging from 44 to 59. The (La/Yb)(N) and delta Eu values range from 16.85 to 81.73 and from 0.68 to 0.93, respectively, showing strongly fractionated REE patterns that are similar to those of adakites. The rocks are enriched in Ba, Sr and LREE, but strongly depleted in Nb and Ta, and slightly depleted in Rb and Ti. The Yb and Y contents span of 0.31 - 1.32 mu g/g and 4.32 similar to 12.07 mu g/g, respectively, suggesting that the rocks are depleted in Yb and Y. The Sr/Y ratios are between 67.74 and 220.60, showing a clear feature of low-Y and high-Sr. All these geochemical characteristics are similar to adakites. Considering that the Paleo-Asian Ocean and Mongol-Okhotsk Ocean were closed in the Late Paleozoic and Permian-Middle Jurassic, respectively, the origin of the interested adakites can be related to partial melting of delaminated crust which were thickened by the collisional orogeny between the Siberia and Mongol-Sinokorea continents.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000256696700028&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Geology; SCI(E); 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 17; ARTICLE; 4; 899-910; 24
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/397416]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Wu Guang,Chen YanJing,Sun FenYue,et al. Geochemistry of the Late Jurassic granitoids in the northern end area of Da Hinggan Mountains and their geological and prospecting implications[J]. 岩石学报,2008.
APA	Wu Guang,Chen YanJing,Sun FenYue,Li JingChun,Li ZhiTong,&Wang XiJin.(2008).Geochemistry of the Late Jurassic granitoids in the northern end area of Da Hinggan Mountains and their geological and prospecting implications.岩石学报.
MLA	Wu Guang,et al."Geochemistry of the Late Jurassic granitoids in the northern end area of Da Hinggan Mountains and their geological and prospecting implications".岩石学报 (2008).