Ar-40/Ar-39 dating of intrusive magmatism in the Angara-Taseevskaya syncline and its implication for duration of magmatism of the Siberian traps

doi:10.1016/j.jseaes.2008.11.006

	Ar-40/Ar-39 dating of intrusive magmatism in the Angara-Taseevskaya syncline and its implication for duration of magmatism of the Siberian traps
	Ivanov, Alexei V.1; He, Huaiyu 2; Yang, Liekun 2; Nikolaeva, Irina V.3; Palesskii, Stanislav V.3
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2009-06-02
卷号	35 期号:1 页码:1-12
关键词	Ar-40/Ar-39 Siberian traps Dolerite sills
ISSN号	1367-9120
DOI	10.1016/j.jseaes.2008.11.006
文献子类	Article
英文摘要	Dolerite sills are the dominant type of mafic intrusions within the Siberian traps province. Their total volume is comparable to the volume of effusive magmas. Six large dolerite sills are known on basis of geological Survey data within the Angara-Taseevskaya syncline at the southeastern part of the Siberian traps. We obtained Ar-40/Ar-39 'plateau' ages of 240.1 +/- 1.0/2.5/5.4 Ma and 241.6 +/- 1.3/2.6/5.5 Ma for Tulunskii and Padunskii sills, respectively (errors are reported as x/y/z, where x, y and z are analytical, internal and external errors, respectively). The obtained ages are indistinguishable from each other at level of analytical errors and suggest emplacement of the sills during the same Middle Triassic pulse of magmatism. Samples from Tolstomysovskii and Chuna-Biryusinskii sills did not yield statistically acceptable plateau ages, though their Ar-40/Ar-39 spectra and K/Ca versus apparent age diagrams suggest that they were emplaced in the Middle Triassic too. The dolerites are characterized by uniform trace element and platinum group element patterns typical for low-Ti tholeiites of the Noril'sk area, although the Noril'sk low-Ti tholeiites were erupted at Permo-Triassic boundary about 9 Ma earlier. The low-Ti tholeiites make up the greatest volume of the flood basalts and possess a distinctive chemical signature. Our data suggests that low-Ti tholeiitic magma was emplaced at more than one locality in the Siberian traps province, and in more than one temporal pulse. (C) 2008 Elsevier Ltd. All rights reserved.
WOS关键词	FLOOD-BASALT VOLCANISM ; PERMIAN-TRIASSIC BOUNDARY ; LARGE IGNEOUS PROVINCE ; U-PB ; SYSTEMATIC-ERRORS ; MASS EXTINCTION ; RAPID ERUPTION ; TRACE-ELEMENT ; AGE ; GEOCHRONOLOGY
WOS研究方向	Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000264948700001
资助机构	Institute of Geology and Geophysics (Chinese Academy of Sciences)(RFBR 08-05-98104_siberia) ; Institute of Geology and Geophysics (Chinese Academy of Sciences)(RFBR 08-05-98104_siberia) ; Institute of Geology and Geophysics (Chinese Academy of Sciences)(RFBR 08-05-98104_siberia) ; Institute of Geology and Geophysics (Chinese Academy of Sciences)(RFBR 08-05-98104_siberia) ; Institute of Geology and Geophysics (Chinese Academy of Sciences)(RFBR 08-05-98104_siberia) ; Institute of Geology and Geophysics (Chinese Academy of Sciences)(RFBR 08-05-98104_siberia) ; Institute of Geology and Geophysics (Chinese Academy of Sciences)(RFBR 08-05-98104_siberia) ; Institute of Geology and Geophysics (Chinese Academy of Sciences)(RFBR 08-05-98104_siberia)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/71388]
专题	中国科学院地质与地球物理研究所
通讯作者	Ivanov, Alexei V.
作者单位	1.RAS, Inst Earth Crust, SB, Irkutsk 664033, Russia 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 3.RAS, Inst Geol & Mineral, SB, Novosibirsk 630090, Russia
推荐引用方式 GB/T 7714	Ivanov, Alexei V.,He, Huaiyu,Yang, Liekun,et al. Ar-40/Ar-39 dating of intrusive magmatism in the Angara-Taseevskaya syncline and its implication for duration of magmatism of the Siberian traps[J]. JOURNAL OF ASIAN EARTH SCIENCES,2009,35(1):1-12.
APA	Ivanov, Alexei V.,He, Huaiyu,Yang, Liekun,Nikolaeva, Irina V.,&Palesskii, Stanislav V..(2009).Ar-40/Ar-39 dating of intrusive magmatism in the Angara-Taseevskaya syncline and its implication for duration of magmatism of the Siberian traps.JOURNAL OF ASIAN EARTH SCIENCES,35(1),1-12.
MLA	Ivanov, Alexei V.,et al."Ar-40/Ar-39 dating of intrusive magmatism in the Angara-Taseevskaya syncline and its implication for duration of magmatism of the Siberian traps".JOURNAL OF ASIAN EARTH SCIENCES 35.1(2009):1-12.