Devonian to Permian plate tectonic cycle of the Paleo-Tethys Orogen in southwest China (II): Insights from zircon ages of ophiolites, arc/back-arc assemblages and within-plate igneous rocks and generation of the Emeishan CFB province

doi:10.1016/j.lithos.2009.04.006

	Devonian to Permian plate tectonic cycle of the Paleo-Tethys Orogen in southwest China (II): Insights from zircon ages of ophiolites, arc/back-arc assemblages and within-plate igneous rocks and generation of the Emeishan CFB province
	Jian, Ping 1; Liu, Dunyi 1; Kroener, Alfred 1,2; Zhang, Qi 3; Wang, Yizhao 4; Sun, Xiaomeng 5; Zhang, Wei 1
刊名	LITHOS
	2009-12-01
卷号	113 期号:3-4 页码:767-784
关键词	Zircon age Ophiolite Arc/back-arc Within-plate igneous rocks Paleo-Tethys Emeishan CFB province
ISSN号	0024-4937
DOI	10.1016/j.lithos.2009.04.006
文献子类	Article
英文摘要	New SHRIMP zircon ages for ophiolites, arc/back-arc assemblages and within-plate igneous rocks constrain the evolution of the Paleo-Tethys Orogen of southwest China. Ophiolites represent remnants of the Paleo-Tethys ocean, which was divided by the Simao terrane into two tracts, the main ocean in the west (current position) and a branch in the east. The main ocean has been inferred to originate from Gondwana break-up in the Early Devonian, and the heritage is preserved as the Changning-Menglian ophiolite (SSZ-type). The oceanic branch is represented by the Ailaoshan (NMORB-type)-Jinshajinag (EMORB-type) ophiolites. Zircons from a diabase and a plagiogranite of the Ailaoshan ophiolite yielded (206)Pb/(238)U ages of 382.9 +/- 3.9 Ma and 375.9 +/- 4.2 Ma. The age of a cumulate gabbro from the Jinshajiang ophiolite is 343.5 +/- 2.7 Ma. A metagabbro of the Changning-Menglian ophiolite yielded a crystallization age of 267.1 +/-.1 Ma. We interpret the ages of the Ailaoshan and Jinshajiang ophiolites to represent sea-floor spreading in the branch ocean, whereas the age of the Changning-Menglian ophiolite reflects closure of the main ocean. Arc/back-arc assemblages (zoned mafic-ultramafic complexes and arc volcanic rocks) are records of convergent plate boundary magmatic activity. Rocks of the Gicha complex (back-arc rift) yielded zircon ages of 306.2 +/- 4.6 Ma for a tonalite, 301.0 +/- 2.9 Ma for a microgabbro, 297.1 +/- 2.0 Ma for a plagioclase hornblendite, and 281.3 +/- 1.7 Ma for a diabase. A gabbro and a tonalite of the Banpo complex (plutonic arc) yielded identical ages of 285.6 +/- 1.7 Ma and 285.8 +/- 2.0 Ma. A basalt of the Yaxianqiao volcanic arc was dated at 266.2 +/- 2.2 Ma. Within-plate igneous rocks were also dated. Two amphbolite xenoliths in the Jinshajiang ophiolite melange, derived from low-Ti continental flood basalts, have zircon ages of 439.3 +/- 3.5 Ma and 403.7 +/- 3.1 Ma, which we interpret to represent the inception of continental rifting prior to the opening of the branch ocean. The small Dalongkai differentiated mafic-ultramafic intrusion reflects post-orogenic extension and is characterized by superimposed arc and within-plate geochemical signatures. Zircons from a plagioclase pyroxenite of this intrusion yielded an age of 245.6 +/- 1.4 Ma.
WOS关键词	CONTINENTAL BREAK-UP ; PLUME-LITHOSPHERE INTERACTION ; VOLCANIC RIFTED MARGIN ; COAST RANGE OPHIOLITE ; SW CHINA ; MANTLE PLUME ; FLOOD BASALTS ; GEOCHEMICAL EVIDENCE ; SPREADING RIDGES ; NORTH-ATLANTIC
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000272787200027
资助机构	National Natural Science Foundation of China(40272043 ; National Natural Science Foundation of China(40272043 ; 40672048) ; 40672048) ; National Natural Science Foundation of China(40272043 ; National Natural Science Foundation of China(40272043 ; 40672048) ; 40672048) ; National Natural Science Foundation of China(40272043 ; National Natural Science Foundation of China(40272043 ; 40672048) ; 40672048) ; National Natural Science Foundation of China(40272043 ; National Natural Science Foundation of China(40272043 ; 40672048) ; 40672048)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/71734]
专题	中国科学院地质与地球物理研究所
通讯作者	Jian, Ping
作者单位	1.Chinese Acad Geol Sci, SHRIMP Ctr, Inst Geol, Beijing 100037, Peoples R China 2.Johannes Gutenberg Univ Mainz, Inst Geowissensch, D-55099 Mainz, Germany 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 4.Reg Geol Survey Yunnan Prov, Yuxi 653100, Peoples R China 5.Jilin Univ, Fac Appl Technol, Changchun 130022, Peoples R China
推荐引用方式 GB/T 7714	Jian, Ping,Liu, Dunyi,Kroener, Alfred,et al. Devonian to Permian plate tectonic cycle of the Paleo-Tethys Orogen in southwest China (II): Insights from zircon ages of ophiolites, arc/back-arc assemblages and within-plate igneous rocks and generation of the Emeishan CFB province[J]. LITHOS,2009,113(3-4):767-784.
APA	Jian, Ping.,Liu, Dunyi.,Kroener, Alfred.,Zhang, Qi.,Wang, Yizhao.,...&Zhang, Wei.(2009).Devonian to Permian plate tectonic cycle of the Paleo-Tethys Orogen in southwest China (II): Insights from zircon ages of ophiolites, arc/back-arc assemblages and within-plate igneous rocks and generation of the Emeishan CFB province.LITHOS,113(3-4),767-784.
MLA	Jian, Ping,et al."Devonian to Permian plate tectonic cycle of the Paleo-Tethys Orogen in southwest China (II): Insights from zircon ages of ophiolites, arc/back-arc assemblages and within-plate igneous rocks and generation of the Emeishan CFB province".LITHOS 113.3-4(2009):767-784.