干旱区生态环境知识资源中心(Arid): Mafic-ultramafic intrusion formed by multi-stage evolution of hydrous basaltic melts

Arid

DOI	10.1130/B35920.1
	Mafic-ultramafic intrusion formed by multi-stage evolution of hydrous basaltic melts
	Li, Qi-Wei; Zhao, Jun-Hong; Zhou, Mei-Fu; Gao, Jian-Feng
通讯作者	Zhao, JH (corresponding author)，China Univ Geosci, Sch Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China.
来源期刊	GEOLOGICAL SOCIETY OF AMERICA BULLETIN
ISSN	0016-7606
EISSN	1943-2674
出版年	2022
卷号	134 期号:1-2
英文摘要	The magmatic processes beneath the active continental margins are very complicated and affect structures and compositions of the arc roots. Neoproterozoic igneous rocks are widely distributed around the margins of the Tarim Block in NW China. The Xingdier mafic-ultramafic intrusion is a composite body, located at the northern margin of the Tarim Block, and consists of gabbro, pyroxenite, and peridotite units. The gabbro unit has a secondary ion mass spectrometry zircon U-Pb age of 727 +/- 5 Ma. Rocks from the Xingdier intrusion have a large range of MgO (12.9-32.8 wt%) and SiO2 (43.0-57.9 wt%), and low K2O + Na2O (0.11-2.25 wt%) contents. They have right inclined chondrite-normalized rare earth element patterns with (La/Yb)(N) ratios of 2.2-8.6. Their primitive mantle normalized trace element patterns show arc-affinity geochemical features characterized by enrichment in Rb, Ba, Th, U, and Pb and depletion in Nb, Ta, and Ti. They have variable initial Sr-87/Sr-86 ratios (0.7063-0.7093), epsilon Nd(t) values (-2.9 to -7.8), Pb-206/Pb-204 (17.08-17.80), Pb-207/Pb-204 (15.42-15.49), and Pb-208/Pb-204 ratios (37.48-38.05), forming an evolution trend from the peridotite unit to the gabbro and pyroxenite units. Clinopyroxene in the three units is chemically similar to those formed in hydrous magmas. The spinel inclusions in olivine from the peridotite unit show unmixing texture and have high Al contents and oxygen fugacity of similar to FMQ+1. Therefore, the parental magma was probably derived from a lithospheric mantle enriched by slab-derived fluids. Rocks from the gabbro and peridotite units are proposed to have been derived from olivine-normative melts, whereas rocks from the pyroxenite unit are cumulates from the quartz-normative melts. Such contrasting parental magmas resulted from variable degrees of crustal contamination and fractional crystallization in the arc root.
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000740369900002
WOS关键词	NORTHEASTERN TARIM BLOCK ; MAGMA CHAMBER PROCESSES ; ILES LAYERED INTRUSION ; ASIAN OROGENIC BELT ; BASIN NW CHINA ; U-PB AGE ; TRACE-ELEMENT ; CRUSTAL EVOLUTION ; EASTERN DESERT ; SW CHINA
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/376823
作者单位	[Li, Qi-Wei; Zhao, Jun-Hong] China Univ Geosci, Sch Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China; [Zhou, Mei-Fu] Univ Hong Kong, Dept Earth Sci, Hong Kong, Peoples R China; [Gao, Jian-Feng] Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550081, Peoples R China
推荐引用方式 GB/T 7714	Li, Qi-Wei,Zhao, Jun-Hong,Zhou, Mei-Fu,et al. Mafic-ultramafic intrusion formed by multi-stage evolution of hydrous basaltic melts[J],2022,134(1-2).
APA	Li, Qi-Wei,Zhao, Jun-Hong,Zhou, Mei-Fu,&Gao, Jian-Feng.(2022).Mafic-ultramafic intrusion formed by multi-stage evolution of hydrous basaltic melts.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,134(1-2).
MLA	Li, Qi-Wei,et al."Mafic-ultramafic intrusion formed by multi-stage evolution of hydrous basaltic melts".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 134.1-2(2022).