胶北荆山群富铝岩系石榴石扩散环带特征及其成因指示意义

doi:10.3321/j.issn:1000-0569.2003.04.017

CORC > 北京大学 > 地球与空间科学学院

	胶北荆山群富铝岩系石榴石扩散环带特征及其成因指示意义; Characteristics and genetic implications of diffusion zoning in garnet from Al-rich rock series of the Jingshan group in north Jiaodong
	周喜文 ; 魏春景 ; 董永胜 ; 卢良兆
刊名	岩石学报
	2003
关键词	石榴石扩散环带粒间流体变质峰期成分富铝岩系胶北荆山群 garnet diffusion zoning grain-boundary fluid peak composition Al-rich rock series Jingshan group in north Jiaodong
DOI	10.3321/j.issn:1000-0569.2003.04.017
英文摘要	通过详细的微区成分测定,发现胶北荆山群富铝岩系中石榴石普遍发育扩散环带,但扩散环带的发育程度及样式很不均匀,明显受与其相邻矿物的控制。与黑云母接触时,石榴石晶体边部的镬含量最低,环带最为发育,与堇青石接触时次之,与长英质矿物接触时则环带发育较弱或不发育。这种特征的石榴石扩散环带样式与传统认识有很大差异,反映降温过程中石榴石与黑云母等镁铁矿物之间的Fe-Mg交换作用主要是通过彼此接触的界面来实现,粒间流体对组分的传输作用有限。但是当岩石中黑云母大量存在而石榴石含量又较低时,由于体系水活度增高,粒间流体也会传输一定的Fe、Mg组分,导致与长英质矿物相邻的石榴石晶体边部发育微弱的扩散环带。通过分析,...; The detailed EPMA analysis indicates that the diffusion zoning is ubiquitous in garnets from M-rich rock series of the Jingshan group in northern Jiaodong. However, the intensity and pattern of the garnet zoning are rather different. The rim of garnet has the lowest Mg content and shows a well-developed diffusion zoning when contacting biotite, a slightly higher Mg content and less-developed diffusion zoning by contacting cordierte, and nearly same Mg content, as that in the core of garnet, and the poor-developed diffusion zoning adjacent to felsic minerals. The characteristics of Mg zoning of garnet is different from the conventional knowledge, and indicates that the Fe-Mg exchange between garnet and biotite or other mafic minerals is resulted from the transfer of interface contact. The grain-boundary fluid seems playing less important role on the process of Fe-Mg exchange. However, Fe and Mg also could be transferred through grain-boundary fluid owing to increasing H2O activity in the rocks and the presence of large volume of biotite and low garnet content. As a result, the weak diffusion zoning could be formed in the garnet rim even though they contact felsic minerals. The metamorphic peak composition of the garnet could be persevered in the core of the grains over 1500 um in size. Accordingly, the core of large biotite away from garnet and among felsic minerals might also have kept peak composition.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000187622300017&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); 16; 04; 752-760; 19
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/48884]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	周喜文,魏春景,董永胜,等. 胶北荆山群富铝岩系石榴石扩散环带特征及其成因指示意义, Characteristics and genetic implications of diffusion zoning in garnet from Al-rich rock series of the Jingshan group in north Jiaodong[J]. 岩石学报,2003.
APA	周喜文,魏春景,董永胜,&卢良兆.(2003).胶北荆山群富铝岩系石榴石扩散环带特征及其成因指示意义.岩石学报.
MLA	周喜文,et al."胶北荆山群富铝岩系石榴石扩散环带特征及其成因指示意义".岩石学报 (2003).