Early Middle Triassic mafic dikes from the Baoshan subterrane, western;Yunnan: implications for the tectonic evolution of the Palaeo-Tethys in;Southeast Asia

doi:10.1080/00206814.2012.758354

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	Early Middle Triassic mafic dikes from the Baoshan subterrane, western;Yunnan: implications for the tectonic evolution of the Palaeo-Tethys in;Southeast Asia
	Liao, Shi-Yong 7; Yin, Fu-Guang ; Sun, Zhi-Ming ; Wang, Dong-Bing ; Tang, Yuan ; Sun, Jie 5
刊名	INTERNATIONAL GEOLOGY REVIEW
	2013
卷号	55 期号:8 页码:976-993
关键词	Southeast Asia Yunnan Palaeo-Tethys final suturing Sibumasu-Indochina collision mafic dikes
ISSN号	0020-6814
DOI	10.1080/00206814.2012.758354
英文摘要	The time of final closure of the Palaeo-Tethys and the Sibumasu-Indochina collision in Southeast Asia represents a major unresolved geologic problem. Here, we present zircon chronology, whole-rock elemental, SrNd, and zircon Hf isotopic geochemistry for newly discovered mafic dikes from the northern segment of the Sibumasu terrane, to provide constraints on this issue. Zircon UPb data indicate that the dikes were emplaced at 240 +/- 3Ma. These are the earliest Mesozoic magmatic rocks reported so far in the Sibumasu terrane, the late Palaeozoic passive margin of the Palaeo-Tethys. They are subalkaline tholeiites, showing geochemical characteristics similar to those of enriched mid-ocean ridge basalts (E-MORBs). They have Sr-87/Sr-86(t) ratios of 0.7031610.703826, ENd(t) of +4.8 to +7.5, and zircon EHf(t) of +9.2 to +13.3, implying strong mantle depletion. They were derived by partial melting of asthenospheric mantle and underwent subsequent fractional crystallization and lithospheric assimilation. The geologicpetrologic evidence suggests that the mafic dikes were generated in a collisional setting, when suturing of the Baoshan and Simao subterranes (the two subterranes are part of the Sibumasu and Indochina terranes, respectively) occurred. These early Middle Triassic mafic dikes provide an upper limit for SibumasuIndochina collision. In conjunction with previous work, we conclude that the final closure of the Palaeo-Tethys and collision of the Sibumasu and Indochina terranes took place during the late Permian to Early Triassic.
学科主题	火成岩岩石学
WOS关键词	U-PB ZIRCON ; NORTHERN THAILAND ; GEOCHEMICAL CONSTRAINTS ; INDOSINIAN ; OROGENY ; SUTURE ZONE ; ICP-MS ; PENINSULAR MALAYSIA ; LITHOSPHERIC MANTLE ; RADIOLARIAN FAUNAS ; LANCANGJIANG ZONE
WOS研究方向	Geology
语种	英语
出版者	TAYLOR & FRANCIS INC
WOS记录号	WOS:000318736600004
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39984]
专题	中国地质调查局成都地质调查中心
作者单位	1.[Liao, Shi-Yong 2.Yin, Fu-Guang 3.Sun, Zhi-Ming 4.Wang, Dong-Bing 5.Tang, Yuan 6.Chinese Geol Survey, Chengdu Inst Geol & Mineral Resources, Chengdu 610082, Peoples R China. 7.中国地质调查局成都地质调查中心
推荐引用方式 GB/T 7714	Liao, Shi-Yong,Yin, Fu-Guang,Sun, Zhi-Ming,et al. Early Middle Triassic mafic dikes from the Baoshan subterrane, western;Yunnan: implications for the tectonic evolution of the Palaeo-Tethys in;Southeast Asia[J]. INTERNATIONAL GEOLOGY REVIEW,2013,55(8):976-993.
APA	Liao, Shi-Yong,Yin, Fu-Guang,Sun, Zhi-Ming,Wang, Dong-Bing,Tang, Yuan,&Sun, Jie.(2013).Early Middle Triassic mafic dikes from the Baoshan subterrane, western;Yunnan: implications for the tectonic evolution of the Palaeo-Tethys in;Southeast Asia.INTERNATIONAL GEOLOGY REVIEW,55(8),976-993.
MLA	Liao, Shi-Yong,et al."Early Middle Triassic mafic dikes from the Baoshan subterrane, western;Yunnan: implications for the tectonic evolution of the Palaeo-Tethys in;Southeast Asia".INTERNATIONAL GEOLOGY REVIEW 55.8(2013):976-993.