Ar-40/Ar-39 geochronological constraints on the age and evolution of the Permo-Triassic Emeishan Volcanic Province, Southwest China

	Ar-40/Ar-39 geochronological constraints on the age and evolution of the Permo-Triassic Emeishan Volcanic Province, Southwest China
	Boven, A ; Pasteels, P ; Punzalan, LE ; Liu, J ; Luo, X ; Zhang, W ; Guo, Z ; Hertogen, J
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2002
卷号	20 期号:2 页码:157-175
ISSN号	1367-9120
文献子类	Article
英文摘要	The biostratigraphically constrained Permo-Triassic Emeishan Volcanic Province (EVP), extending over wide areas in southwest China, has been recently considered as a Large Igneous Province contemporaneous with the Siberian Traps and the siliceous tuffs at the P-T boundary in South China. We report the first Ar-40/Ar-39 ages on this igneous province. Minimum ages have been obtained on phenocrystic plagioclase of the Emeishan basalt, which has undergone a pervasive metamorphism. most likely during subsequent tectonization as a consequence of terrane amalgamation. Comparison between the Ar-release spectra obtained on clear vs. cloudy plagioclase indicates a 40-30 Ma sericite resetting time. A minimum apparent age of 246 +/- 4 Ma for plagioclase from a plagiogranite, a late-differentiate of the Panzhihua Layered Complex, and an age of 254 +/- 5 Ma for phlogopite from a pyroxenite near Lake Erhai, provide the first absolute age constraint on this igneous province. Additional Ar-Ar age measurements on post-Emeishan alkaline and mafic magmatism yielded 104 +/- 2 and 100 +/- 2 Ma for an alkaline complex near Panzhihua. and 42 +/- 1 Ma for a gabbro sill emplaced near the Ertan Dam. Further study is still needed to determine the age of the Emeishan volcanic emission accurately. and to test the validity of the assumed short duration of the eruption. (C) 2002 Elsevier Science Ltd. All rights reserved.
WOS关键词	1985 TIBET GEOTRAVERSE ; FLOOD BASALTS ; PANXI RIFT ; BOUNDARY ; REMAGNETIZATION ; PALEOMAGNETISM ; ROCKS ; EXTINCTION ; MOUNTAINS ; SECTION
WOS研究方向	Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000172494300006
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/77685]
专题	中国科学院地质与地球物理研究所
通讯作者	Boven, A
作者单位	1.Free Univ Brussels, Lab Geochronol, B-1050 Brussels, Belgium 2.Acad Sinica, Inst Geol, Beijing 100029, Peoples R China 3.Katholieke Univ Leuven, Afdeling Fysicochem Geol, B-3001 Louvain, Belgium
推荐引用方式 GB/T 7714	Boven, A,Pasteels, P,Punzalan, LE,et al. Ar-40/Ar-39 geochronological constraints on the age and evolution of the Permo-Triassic Emeishan Volcanic Province, Southwest China[J]. JOURNAL OF ASIAN EARTH SCIENCES,2002,20(2):157-175.
APA	Boven, A.,Pasteels, P.,Punzalan, LE.,Liu, J.,Luo, X.,...&Hertogen, J.(2002).Ar-40/Ar-39 geochronological constraints on the age and evolution of the Permo-Triassic Emeishan Volcanic Province, Southwest China.JOURNAL OF ASIAN EARTH SCIENCES,20(2),157-175.
MLA	Boven, A,et al."Ar-40/Ar-39 geochronological constraints on the age and evolution of the Permo-Triassic Emeishan Volcanic Province, Southwest China".JOURNAL OF ASIAN EARTH SCIENCES 20.2(2002):157-175.