Triassic Nb-enriched basalts, magnesian andesites, and adakites of the Qiangtang terrane (Central Tibet): evidence for metasomatism by slab-derived melts in the mantle wedge

doi:10.1007/s00410-007-0253-1

	Triassic Nb-enriched basalts, magnesian andesites, and adakites of the Qiangtang terrane (Central Tibet): evidence for metasomatism by slab-derived melts in the mantle wedge
	Wang, Qiang 2; Wyman, Derek A.1; Xu, Jifeng 2; Wan, Yusheng 3; Li, Chaofeng 4; Zi, Feng 2; Jiang, Ziqi ; Qiu, Huaning 2; Chu, Zhuyin 4; Zhao, Zhenhua 2
刊名	CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
	2008-04-01
卷号	155 期号:4 页码:473-490
关键词	Adakite Nb-enriched Basalt Magnesian Andesite Triassic Subduction Zone Tibet
ISSN号	0010-7999
DOI	10.1007/s00410-007-0253-1
文献子类	Article
英文摘要	New chronological, geochemical, and isotopic data are reported for Triassic (219-236 Ma) adakite-magnesian andesite-Nb-enriched basaltic rock associations from the Tuotuohe area, central Qiangtang terrane. The adakites and magnesian andesites are characterized by high Sr/Y (25-45), La/Yb (14-42) and Na(2)O/K(2)O (12-49) ratios, high Al(2)O(3) (15.34-18.28 wt%) and moderate to high Sr concentrations (220-498 ppm) and epsilon(ND) (t) (+0.86 to +1.21) values. Low enrichments of Th, Rb relative to Nb, and subequal normalized Nb and La contents, and enrichments of light rare earth elements combine to distinguish a group of Nb-enriched basaltic rocks (NEBs). They have positive epsilon(ND) (t) (+2.57 to +5.16) values. Positive correlations between Th, La and Nb and an absence of negative Nb anomalies on mantle normalized plots indicate the NEBs are products of a mantle source metasomatized by a slab melt rather than by hydrous fluids. A continuous compositional variation between adakites and magnesian andesites confirms slab melt interaction with mantle peridotite. The spatial association of the NEBs with adakites and magnesian andesites define an "adakitic metasomatic volcanic series" recognized in many demonstrably subduction-related environments (e.g., Mindanao arc, Philippines; Kamchatka arc, Russia; and southern Baja California arc, Mexico). The age of the Touhuohe suite, and its correlation with Triassic NEB to the north indicates that volcanism derived from subduction-modified mantle was abundant prior to 220 Ma in the central Qiangtang terrane.
WOS关键词	STRENGTH ELEMENT ENRICHMENT ; METAMORPHIC CORE COMPLEXES ; LOWER CONTINENTAL-CRUST ; NORTH CHINA CRATON ; SOUTH CHINA ; TECTONIC EVOLUTION ; VOLCANIC-ROCKS ; TRACE-ELEMENT ; ARC BASALTS ; SUPERIOR PROVINCE
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000253212500005
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/81076]
专题	中国科学院地质与地球物理研究所
通讯作者	Wyman, Derek A.
作者单位	1.Univ Sydney, Sch Geosci, Div Geol & Geophys, Sydney, NSW 2006, Australia 2.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Isotope Geochronol & Geochem, Guangzhou 510640, Peoples R China 3.Chinese Acad Med Sci, Inst Geol, Beijing 100037, Peoples R China 4.Chinese Acad Med Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Wang, Qiang,Wyman, Derek A.,Xu, Jifeng,et al. Triassic Nb-enriched basalts, magnesian andesites, and adakites of the Qiangtang terrane (Central Tibet): evidence for metasomatism by slab-derived melts in the mantle wedge[J]. CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,2008,155(4):473-490.
APA	Wang, Qiang.,Wyman, Derek A..,Xu, Jifeng.,Wan, Yusheng.,Li, Chaofeng.,...&Dong, Yanhui.(2008).Triassic Nb-enriched basalts, magnesian andesites, and adakites of the Qiangtang terrane (Central Tibet): evidence for metasomatism by slab-derived melts in the mantle wedge.CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,155(4),473-490.
MLA	Wang, Qiang,et al."Triassic Nb-enriched basalts, magnesian andesites, and adakites of the Qiangtang terrane (Central Tibet): evidence for metasomatism by slab-derived melts in the mantle wedge".CONTRIBUTIONS TO MINERALOGY AND PETROLOGY 155.4(2008):473-490.