新疆百口泉闪长岩中高An值斜长石的成因及岩石学意义

CORC > 北京大学 > 地球与空间科学学院

	新疆百口泉闪长岩中高An值斜长石的成因及岩石学意义; The origin of high-An plagioclase in diorite from Baikouquan, Xinjiang and its petrogenetic significance
	陈博 ; 朱永峰
刊名	岩石学报
	2015
关键词	高An值斜长石循环晶闪长岩岩浆作用西准噶尔 High-An plagioclase Antecryst Diorite Magmatism West Junggar
英文摘要	岩浆成因的高An值斜长石(An80~100)是玄武质岩浆早期结晶的产物,由于其形成条件较为苛刻,它对于限定寄主岩浆条件和探讨岩石成因有重要的指示作用。在新疆西准噶尔百口泉地区发育含高An值斜长石(An80~90)的闪长岩,高An值斜长石呈不规则包裹体形式存在于闪长岩主体斜长石中(An40~60)。锆石SHRIMP定年显示百口泉闪长岩形成于316.9±2.9Ma(MSWD=1.5),闪长岩主、微量元素和Sr-Nd同位素与区域内同时期岩浆作用产物具有相似的演化趋势。根据闪长岩岩石学特征,结合高An值斜长石的实验研究成果,本文认为百口泉闪长岩中的高An值斜长石不是捕虏晶,也不是闪长岩的结晶产物,而是...; Magmatic high-An plagioclase (An(80-100)) crystallizes at the early stage of basaltic melt evolution. Due to the restricted conditions under which high-An plagioclase can form and preserve, it can help constrain the crystallization environment and petrogenesis of the host magma. High-An plagioclase (An(80-90)) bearing diorite outcrops in Baikouquan, West Junggar, Xinjiang. It was dated to be 316. 9 +/- 2. 9Ma (MSWD = 1. 5) by zircon SHRIMP. The high-An plagioclase occur as irregular patches in the predominant plagioclase of diorite. The major and trace elements and Sr-Nd isotopic data match the trend of the contemporary intrusions in this region. Detailed petrological and mineralogical studies demonstrate the high-An plagioclase are antecryst which belong to the magmatic system producing the host but are no directly consequence of the crystallization of the host. They came from an earlier pulse of magma and which are incorporated in a later pulse. Based on the Al-in-amphibole geobarometer, the diorite crystallized at 1. 2 similar to 2. 9kbar, which is compatible with the condition for the high-An plagioclase formation. The crystallization of high-An plagioclase in Baikouquan diorite suggests a H2O-rich and depleted primary magma, and has a profound implication on the magmatic system.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000350616100014&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); 0; chenbo-geo@pku.edu.cn; 02; 479-490; 31
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/206391]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	陈博,朱永峰. 新疆百口泉闪长岩中高An值斜长石的成因及岩石学意义, The origin of high-An plagioclase in diorite from Baikouquan, Xinjiang and its petrogenetic significance[J]. 岩石学报,2015.
APA	陈博,&朱永峰.(2015).新疆百口泉闪长岩中高An值斜长石的成因及岩石学意义.岩石学报.
MLA	陈博,et al."新疆百口泉闪长岩中高An值斜长石的成因及岩石学意义".岩石学报 (2015).