Magmatic and metamorphic development of an early to mid-Paleozoic;continental margin arc in the southernmost Central Asian Orogenic Belt,;Inner Mongolia, China

doi:10.1016/j.jseaes.2012.05.025

	Magmatic and metamorphic development of an early to mid-Paleozoic;continental margin arc in the southernmost Central Asian Orogenic Belt,;Inner Mongolia, China
	Zhang, Wei 3; Jian, Ping ; Kroener, Alfred 1; Shi, Yuruo
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2013
卷号	72;SI SI 页码:63-74
关键词	Zircon Continental margin arc Magmatism Metamorphism Central Asian Orogenic Belt Paired metamorphic belts
ISSN号	1367-9120;EI 1878-5786
DOI	10.1016/j.jseaes.2012.05.025
英文摘要	The Bainaimiao arc in Inner Mongolia, China, comprises a weakly metamorphosed volcani-sedimentary sequence and a low-P/T metamorphic complex. In this study we present SHRIMP zircon ages and geochemical data to document the temporal and genetic relationships between these two tectonic units. Zircons from a rhyolite and two dacites (high-K calc-alkaline) of the volcani-sedimentary sequence yielded Pb-206/U-238 ages of 474 +/- 7 Ma, 453 +/- 7 Ma and 436 +/- 9 Ma respectively, that we interpret as recording the timing of three volcanic arc episodes. Rocks from the low-P/T metamorphic complex yielded zircon ages of 462 +/- 11 Ma for a sillimanite gneiss and 437 +/- 5 Ma for a plagioclase-hornblende gneiss, reflecting two distinct anatectic events. Also from the low-P/T complex, the protolith age of a metadiorite is 438 +/- 2 Ma. A diorite from a weakly deformed diorite-granodiorite pluton in the low-P/T complex has a zircon age of 419 +/- 10 Ma that correlates in time with regional collisional magmatism. An undeformed pegmatite dike cutting the low-P/T metamorphic complex has an age of 411 +/- 8 Ma, which postdates collision and provides an upper limit for the termination of orogeny. Accordingly, we conclude that the volcani-sedimentary sequence and the low-P/T metamorphic complex evolved coherently in the early to mid-Paleozoic and formed an integral continental margin arc in the southernmost Central Asian Orogenic Belt. (c) 2012 Elsevier Ltd. All rights reserved.
学科主题	火成岩岩石学
WOS关键词	ARABIAN-NUBIAN SHIELD ; U-PB AGES ; CENTRAL AUSTRALIA ; SOLONKER SUTURE ; TIME-SCALE ; ZIRCON ; ZONE ; PETROGENESIS ; ACCRETION ; GROWTH
WOS研究方向	Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000321404900006
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40169]
专题	中国地质科学院地质研究所
作者单位	1.Chinese Acad Geol Sci, Inst Geol, SHRIMP Ctr, Beijing 100037, Peoples R China. 2.Johannes Gutenberg Univ Mainz, Inst Geowissensch, D-55099 Mainz, Germany. 3.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Zhang, Wei,Jian, Ping,Kroener, Alfred,et al. Magmatic and metamorphic development of an early to mid-Paleozoic;continental margin arc in the southernmost Central Asian Orogenic Belt,;Inner Mongolia, China[J]. JOURNAL OF ASIAN EARTH SCIENCES,2013,72;SI SI:63-74.
APA	Zhang, Wei,Jian, Ping,Kroener, Alfred,&Shi, Yuruo.(2013).Magmatic and metamorphic development of an early to mid-Paleozoic;continental margin arc in the southernmost Central Asian Orogenic Belt,;Inner Mongolia, China.JOURNAL OF ASIAN EARTH SCIENCES,72;SI SI,63-74.
MLA	Zhang, Wei,et al."Magmatic and metamorphic development of an early to mid-Paleozoic;continental margin arc in the southernmost Central Asian Orogenic Belt,;Inner Mongolia, China".JOURNAL OF ASIAN EARTH SCIENCES 72;SI SI(2013):63-74.