中南祁连西缘肃北三个洼塘地区古生代两类花岗质侵入岩年代学及其地质意义

CORC > 北京大学 > 地球与空间科学学院

	中南祁连西缘肃北三个洼塘地区古生代两类花岗质侵入岩年代学及其地质意义; Geochronology of two kinds of Paleozoic granitic plutons from Sangewatang in Subei, the western margin of Central-South Qilian and their geological implications
	罗志文 ; 张志诚 ; 李建锋 ; 冯志硕 ; 汤文豪
刊名	岩石学报
	2015
关键词	中南祁连岩浆活动拉张环境岛弧古生代 Central-South Qilian Magma activities Extensional setting Island arc Paleozoic
英文摘要	中南祁连西缘三个洼塘附近花岗质岩石由花岗岩、石英闪长岩和花岗闪长岩构成。LA-ICP-MS锆石U-Pb年龄测定结果表明,花岗岩、石英闪长岩和花岗闪长岩侵位年龄分别为416.7±4.3Ma(MSWD=0.52)、442.5±4.7Ma(MSWD=0.46)和443.9±1.3Ma(MSWD=0.17),指示本区发生了两期岩浆活动事件。花岗质岩石均表现为过铝质,花岗岩高钾、K/Na,低Mg、Fe、Ca的主量元素特征,富集高场强元素,亏损大离子亲石元素,∑REE为122.0×10-6,δEu为0.05,具明显负铕异常。花岗闪长岩和石英闪长岩多数富钠,高场强元素含量相对花岗岩较低,而大离子亲石元素含量...; The granitoids from Sangewatang in the western margin of Central-South Qilian are composed of granites, quartz diorites and granodiorites. LA-ICP-MS zircon U-Pb age of granite is 416.7 +/- 4.3Ma (MSWD = 0.52), while that of quartz diorite and granodiotite are 442.5 +/- 4.7 (MSWD = 0.46) and 443.9 +/- 1.3Ma (MSWD = 0.17) respectively, indicating that two magmatic events have occurred in the study area The granite is peraluminous with high K/Na and K content, and low Mg, Fe and Ca content Meanwhile, it is enriched in high field strength elements, and depleted in large ion lithophile elements. Its Sigma REE is 122.0 x 10(-6) and delta Eu is 0.05 with significant Eu negative anomaly. In contrast, the granodiorite and quartz diorite are also peraluminous but are enriched in Na. They have a lower content of high field strength elements and a slightly higher content of large ion lithophile elements. Their Sigma REE range from 133.3 x 10(-6) to 247.6 x 10(-6) and delta Eu range from 0.73 to 1.09, showing no significant Eu anomalies. Based on these geochemical characteristics, we conclude that the granites belong to I-type granites and were produced by partial melting of continental crust in a post-orogenic extensional setting. In contrast, the granodiorites and quartz diorites are I-type granites and are likely to be the product of island arc magmatism, associated with oceanic subduction. These results are of key importance to constrain the tectonic evolution of Central-South Qilian.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000349509300013&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; SCI(E); 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); 2; zhiwenluoluo@163.com; zczhang@pku.edu.cn; 01; 176-188; 31
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/206519]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	罗志文,张志诚,李建锋,等. 中南祁连西缘肃北三个洼塘地区古生代两类花岗质侵入岩年代学及其地质意义, Geochronology of two kinds of Paleozoic granitic plutons from Sangewatang in Subei, the western margin of Central-South Qilian and their geological implications[J]. 岩石学报,2015.
APA	罗志文,张志诚,李建锋,冯志硕,&汤文豪.(2015).中南祁连西缘肃北三个洼塘地区古生代两类花岗质侵入岩年代学及其地质意义.岩石学报.
MLA	罗志文,et al."中南祁连西缘肃北三个洼塘地区古生代两类花岗质侵入岩年代学及其地质意义".岩石学报 (2015).