Late Permian mafic magmatism along the Tethyan Himalayan Belt, southern Tibet and tectonic implications

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	Late Permian mafic magmatism along the Tethyan Himalayan Belt, southern Tibet and tectonic implications
	Zeng, LS (Zeng LingSen); Gao, L (Gao LiE); Hou, KJ (Hou KeJun); Tang, SH (Tang SuoHan)
刊名	ACTA PETROLOGICA SINICA
	2012
卷号	28 期号:6 特刊 SI 页码:1731-1740
关键词	Neo-Tethyan Ocean Diabase Permian magmatism Continental rifting Tibet
ISSN号	1000-0569
英文摘要	We report a new occurrence of Late Permian mafic magmatic rock near the Yardoi gneiss dome within the Tethyan Himalayan Belt, southern Tibet. This suite of diabase intruded into the fine-grained sandstone and shale of the Tethyan sedimentary sequence and formed at 273.0 +/- 2.2Ma (SHRIMP zircon U-Pb age), which indicates that the sedimentary rocks intruded by the diabase formed before Late Permian and not the Late Triassic as assigned by previous studies. This suite of diabase is characterized by (1) enrichment in LREE and depletion in HREE; (2) high contents of HFSE; (3) relatively high Sr (Sr-87/Sr-86(t) = 0.7063 similar to 0.7078) and Nd(epsilon(Nd) (t) = -1.1 similar to -2.4) isotope compositions, similar to those in the contemporaneous continental flood basalts and diabases in the western Tethyan Himalaya; and (4) positive epsilon(Hf)(t) (+2.5 similar to +3.9) values. Combined with literature data, out new results suggest that the Late Permian mafic magmatism, though distributed sporadically along the Tethyan Himalaya, is more widespread and signifies the rifting along the northern margin of the Gondwana continent and the initial opening of the Neo-Tethyan Ocean.
学科主题	地层学与地史学
WOS关键词	YARDOI GNEISS DOME ; BREAK-UP ; GEOLOGICAL IMPLICATIONS ; SEDIMENTARY HISTORY ; SOUTHEASTERN TIBET ; LADAKH HIMALAYA ; PASSIVE MARGIN ; BASALTS ; INDIA ; ZIRCON
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000305817000003
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39677]
专题	中国地质调查局
作者单位	Chinese Acad Geol Sci, Inst Mineral Resources, Beijing 100037, Peoples R China
推荐引用方式 GB/T 7714	Zeng, LS ,Gao, L ,Hou, KJ ,et al. Late Permian mafic magmatism along the Tethyan Himalayan Belt, southern Tibet and tectonic implications[J]. ACTA PETROLOGICA SINICA,2012,28(6 特刊 SI):1731-1740.
APA	Zeng, LS ,Gao, L ,Hou, KJ ,&Tang, SH .(2012).Late Permian mafic magmatism along the Tethyan Himalayan Belt, southern Tibet and tectonic implications.ACTA PETROLOGICA SINICA,28(6 特刊 SI),1731-1740.
MLA	Zeng, LS ,et al."Late Permian mafic magmatism along the Tethyan Himalayan Belt, southern Tibet and tectonic implications".ACTA PETROLOGICA SINICA 28.6 特刊 SI(2012):1731-1740.