Isotopic ages of the carbonatitic volcanic rocks in the Kunyang rift zone in central Yunnan, China

	Isotopic ages of the carbonatitic volcanic rocks in the Kunyang rift zone in central Yunnan, China
	Zhang, YB ; Wang, GL ; Nie, JF ; Zhao, CS ; Xu, CY ; Qui, JX ; Wang, H
刊名	ACTA GEOLOGICA SINICA-ENGLISH EDITION
	2003-06-01
卷号	77 期号:2 页码:204-211
关键词	Kunyang rift central Yunnan China Precambrian mineralization zone carbonatitic volcanic rocks isotopic chronology iron and copper deposit carbonatite
ISSN号	1000-9515
文献子类	Article
英文摘要	The Mesoproterozoic Kunyang rift, which is located on the western margin of the Yangtze platform and the southern section of the Kangdian axis, is a rare massive Precambrian iron-copper polymetallic mineralization zone in China. The Mesoproterozoic Wulu (Wuding-Lufeng) basin in the middle of the rift is an elliptic basin controlled by a ring fracture system. Moreover, volcanic activities in the basin display zonation of an outer ring, a middle ring and an inner ring with carbonatitic volcanic rocks and sub-volcanic dykes discovered in the outer and middle rings. The Sm-Nd isochron ages have been determined for the outer-ring carbonatitic lavas (1685 Ma) and basaltic porphyrite of the radiating dyke swarm (1645 Ma) and the Rb-Sr isochron ages for the out-ring carbonatitic lavas (893 Ma) and the middle-ring dykes (1048 Ma). In combination of the U-Pb concordant ages of zircon (1743 Ma) in trachy-andesite of the corresponding period and stratum (1569 Ma) of the Etouchang Formation, as well as the Rb-Sr isochron age (1024 Ma) and K-Ar age (1186 Ma) of the dykes in the middle ring, the age of carbonatites in the basin is preliminarily determined. It is ensured that all of these carbonatites were formed in the Mesoproterozoic period, whereby two stages could be identified as follows: in the first stage, carbonatitic volcanic groups, such as lavas, pyroclastic rocks and volcaniclastic sedimentary rocks, were formed in the outer ring; in the second stage, carbonatitic breccias and dykes appeared in the middle ring. The metamorphic age of the carbonatitic lavas in the outer ring was determined to be concurrent with the end of the first stage of the Neoproterozoic period, corresponding to the Riming movement in central Yunnan.
WOS研究方向	Geology
语种	英语
出版者	GEOLOGICAL SOC CHINA
WOS记录号	WOS:000184210600008
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/78401]
专题	中国科学院地质与地球物理研究所
通讯作者	Zhang, YB
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Res Ctr Mineral Resources Explorat, Key Lab Mineral Resources, Beijing 100101, Peoples R China 2.China Univ Geosci, Fac Earth Sci, Wuhan 430074, Hubei, Peoples R China 3.CNOOC Res Ctr, Explorat Inst, Gaobeidian 050000, Hebei, Peoples R China 4.Nanyang Inst Technol, Nanyang 473100, Henan, Peoples R China 5.SW Geol Explorat Bur, Geol Div, Kunming 650000, Yunnan, Peoples R China
推荐引用方式 GB/T 7714	Zhang, YB,Wang, GL,Nie, JF,et al. Isotopic ages of the carbonatitic volcanic rocks in the Kunyang rift zone in central Yunnan, China[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2003,77(2):204-211.
APA	Zhang, YB.,Wang, GL.,Nie, JF.,Zhao, CS.,Xu, CY.,...&Wang, H.(2003).Isotopic ages of the carbonatitic volcanic rocks in the Kunyang rift zone in central Yunnan, China.ACTA GEOLOGICA SINICA-ENGLISH EDITION,77(2),204-211.
MLA	Zhang, YB,et al."Isotopic ages of the carbonatitic volcanic rocks in the Kunyang rift zone in central Yunnan, China".ACTA GEOLOGICA SINICA-ENGLISH EDITION 77.2(2003):204-211.