滇西点苍山-哀牢山变质岩系变质时限研究

CORC > 北京大学 > 地球与空间科学学院

	滇西点苍山-哀牢山变质岩系变质时限研究; Metamorphic time limits' study on the metamorphic rocks series of Ailao Shan-Diancang Mountain Ranges, west Yunnan.
	李宝龙 ; 季建清 ; 付孝悦 ; 龚俊峰 ; 宋彪 ; 庆建春 ; 张臣 ; 马宗晋
刊名	岩石学报
	2009
关键词	渐新世变质变形作用地质年代学点苍山-哀牢山 Oligocene Metamorphism and deformation Geochronology Ailao Shan-Diancang Mountain Ranges
英文摘要	点苍山—哀牢山变质带沿红河—哀牢山走滑剪切带呈北西-南东向展布,其主体由下元古界苍山群和哀牢山群深变质岩系组成,是滇西最显著的带状变质带之一。点苍山—哀牢山变质带的变质时限和山脉隆升时限由于缺乏精确年代学数据制约,一直存在不同认识。本文选取点苍山花岗闪长质糜棱岩(DCS-1),哀牢山墨江-元江段黑云母花岗闪长质片麻岩(SM07-1)和其侵位的同变形花岗岩脉(SM07-3)以及元江县城西北山前花岗质片麻岩(YJ)作为研究对象,并挑选出锆石颗粒(SM07-3)、黑云母(SM07-1-Bi,SM07-3-Bi)、白云母(SM07-1-Ms)、钾长石(DCS-1-Kf,SM07-3-Kf)和斜长石(Y...; Ailao Shan-Diancang Mountain Ranges, which are situated in the central part of Yunnan Province, are distribute(] along the lied River-Ailaoslian strike-slip shear zone with northwest-southeast trending. The principal part of Ailao Shan-Diancang Mountain Ranges are composed of high metamorphic rock series (eg. Cangshan Group and Ailaoshan Group), which are considered as the Precambrian metamorphic basement of the Yangtze Plate. The uplift time limit of Ailao Shan-Diancang Mountain Ranges and it's metamorphic time limit, which due to lack of the accurate geochronological data constraints, have always been different views. Ill this paper we choose the granodioritic mylonite of Diancangshan Mountain (DCS-1), biotite granodioritic gneiss (SM07-1) and its synchronic deformational granite vein intrusion (SM07-3) of Ailaoshan Mountain' Yuanjiang-Mojiang section and granitic gneiss (YJ) in the northwest of Yuanjiang city its research objects, and selected zircon particles ( SM07-3), biotite (SM07-1Bi, SM07-3Bi), Muscovite (SM07-1Ms), potassium feldspar (DCS-1-kf, SM07-1-kf), plagioclase (YJ-Pl) and matrix (YJ-ma) to do the accurate chronology tests. The zircons from the granite vein yielded a concordant U-Pb SHRIMP ages of 30.8 +/- 0.3Ma (SM07-3, MSWD = 3.27). The laser (40)Ar/(39)Ar isochron ages of the other single minerals were 13.1 +/- 1.5Ma (DCS-1-Kf, MSWD = 2.9) 22.3 +/- 0.9Ma (SM07-1-Ms, MSWD = 1.7), 21.9 +/- 0.7Ma(SM07-1-Bi, MSWD = 1.3), 21.3 +/- 0.7Ma(SM07-3-Kf, MSWD = 1.2), 22.7 +/- 0.8Ma (SM07-3-Bi, MSWD = 2.4), 19.8 +/- 1.6Ma(YJ-ma, MSWD = 19) and 21.57 + 0.38Ma(YJ-Pl, MSWD = 1.5), respectively. With the regional geological background, geological evolution, field observations and geochronological data, this paper draws the conclusion that: the peak metamorphism deformation time of Ailao Shan-Diancang Shan metamorphic belt was about 30Ma, at this time the mountain ranges have began uplifting, and about 20Ma and 13Ma the mountains were underwent structural thermal events. It revealed that the mountains had experienced rapid uplifting and cooling process.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000264895900012&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); 10; 03; 595-608; 25
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/49971]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	李宝龙,季建清,付孝悦,等. 滇西点苍山-哀牢山变质岩系变质时限研究, Metamorphic time limits' study on the metamorphic rocks series of Ailao Shan-Diancang Mountain Ranges, west Yunnan.[J]. 岩石学报,2009.
APA	李宝龙.,季建清.,付孝悦.,龚俊峰.,宋彪.,...&马宗晋.(2009).滇西点苍山-哀牢山变质岩系变质时限研究.岩石学报.
MLA	李宝龙,et al."滇西点苍山-哀牢山变质岩系变质时限研究".岩石学报 (2009).