Early Late Cretaceous (ca. 93 Ma) norites and hornblendites in the Milin area, eastern Gangdese: Lithosphere-asthenosphere interaction during slab roll-back and an insight into early Late Cretaceous (ca. 100-80 Ma) magmatic "flare-up" in southern Lhasa (Tibet)

doi:10.1016/j.lithos.2013.03.007

	Early Late Cretaceous (ca. 93 Ma) norites and hornblendites in the Milin area, eastern Gangdese: Lithosphere-asthenosphere interaction during slab roll-back and an insight into early Late Cretaceous (ca. 100-80 Ma) magmatic "flare-up" in southern Lhasa (Tibet)
	Ma, Lin 1,2,3,4; Wang, Qiang 1; Li, Zheng-Xiang ; Wyman, Derek A.5; Jiang, Zi-Qi 1; Yang, Jin-Hui 6; Gou, Guo-Ning 1,2,3,4; Guo, Hai-Feng 1,2,3,4
刊名	LITHOS
	2013-07-01
卷号	172 页码:17-30
关键词	Late Cretaceous Lithosphere-asthenosphere interaction Magmatic flare-up Roll-back Gangdese batholith Tibet
ISSN号	0024-4937
DOI	10.1016/j.lithos.2013.03.007
文献子类	Article
英文摘要	At more than 500 km in length, the mainly Jurassic-Early Eocene Gangdese batholith is one of the most important constituents of the southern Lhasa sub-block and provides an ideal site for study of Tibetan orogenesis. Recent studies on Gangdese intermediate-felsic intrusive rocks, mainly granites, demonstrate that remarkable crustal growth as well as an early Late Cretaceous (ca. 100-80 Ma) magmatic "flare-up" event occurred in southern Tibet. However, the mechanism that drove this magmatic event and its relationship to crustal growth event are not yet dear. Here, we report detailed petrological, geochronological, geochemical and Sr-Nd-Hf isotopic data for recently identified norites and hypersthene-bearing hornblendites in the Milin area, southern Lhasa sub-block These mafic rocks are dated at early Late Cretaceous (ca. 93 Ma), and are characterized by relatively uniform Sr-Nd-Hf isotopic compositions ((Sr-87/Sr-86)(i) = 0.7042 to 0.7047, epsilon(Nd)(t) = +2.9 to +3.6 and epsilon(Hf)(t)(zircon) = +10.9 to +17.0), suggesting that they evolved from similar parental magmas. The Milin norites and hornblendites are likely to be the products of mineral fractionation and accumulation from a common parental magma during the early and late stages of the magma evolution, respectively. Thermometric calculations indicate that pyroxenes from the Milin norites have high crystallization temperatures (1240-1349 degrees C). The parental magmatic compositions calculated from pyroxene trace element compositions in the Milin norites show slightly flat to enriched light rare earth element (LREE) patterns ([La/Yb](N) = 2.9-3.4; [La/Gd](N) = 2.1-2.9) with variable negative Nb anomalies ([Nb/La](N) = 0.18-0.81), indicating their dual or hybrid geochemical characteristics. We suggest that their parental magmas may have been generated by the interaction of upwelling asthenospheric and metasomatized lithospheric mantle. Taking into account the spatial and temporal distribution of the Mesozoic magmatic rocks and regional paleomagnetic data, we further suggest that the early-Late Cretaceous magmatic "flare-up" in the southern Lhasa sub-block was also triggered by the asthenospheric upwelling, which resulted from roll-back of subducted Tethyan oceanic slab. (C) 2013 Elsevier B.V. All rights reserved.
WOS关键词	MELT-PERIDOTITE INTERACTION ; HF ISOTOPE CONSTRAINTS ; OCEAN MANTLE DOMAIN ; TRACE-ELEMENTS ; TECTONIC EVOLUTION ; PB GEOCHRONOLOGY ; VOLCANIC-ROCKS ; SE CHINA ; CONTINENTAL COLLISION ; SOUTHEASTERN TIBET
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000321169400002
资助机构	Chinese Academy of Sciences(XDB03010600) ; Chinese Academy of Sciences(XDB03010600) ; National Natural Science Foundation of China(41025006 ; National Natural Science Foundation of China(41025006 ; 41073029 ; 41073029 ; 41121002) ; 41121002) ; Chinese Academy of Sciences(XDB03010600) ; Chinese Academy of Sciences(XDB03010600) ; National Natural Science Foundation of China(41025006 ; National Natural Science Foundation of China(41025006 ; 41073029 ; 41073029 ; 41121002) ; 41121002) ; Chinese Academy of Sciences(XDB03010600) ; Chinese Academy of Sciences(XDB03010600) ; National Natural Science Foundation of China(41025006 ; National Natural Science Foundation of China(41025006 ; 41073029 ; 41073029 ; 41121002) ; 41121002) ; Chinese Academy of Sciences(XDB03010600) ; Chinese Academy of Sciences(XDB03010600) ; National Natural Science Foundation of China(41025006 ; National Natural Science Foundation of China(41025006 ; 41073029 ; 41073029 ; 41121002) ; 41121002)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/87947]
专题	中国科学院地质与地球物理研究所
通讯作者	Wang, Qiang
作者单位	1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Curtin Univ, ARC Ctr Excellence, CCFS, Perth, WA 6845, Australia 4.Curtin Univ, Inst Geosci Res TIGeR, Dept Appl Geol, Perth, WA 6845, Australia 5.Univ Sydney, Sch Geosci, Sydney, NSW 2006, Australia 6.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Ma, Lin,Wang, Qiang,Li, Zheng-Xiang,et al. Early Late Cretaceous (ca. 93 Ma) norites and hornblendites in the Milin area, eastern Gangdese: Lithosphere-asthenosphere interaction during slab roll-back and an insight into early Late Cretaceous (ca. 100-80 Ma) magmatic "flare-up" in southern Lhasa (Tibet)[J]. LITHOS,2013,172:17-30.
APA	Ma, Lin.,Wang, Qiang.,Li, Zheng-Xiang.,Wyman, Derek A..,Jiang, Zi-Qi.,...&Guo, Hai-Feng.(2013).Early Late Cretaceous (ca. 93 Ma) norites and hornblendites in the Milin area, eastern Gangdese: Lithosphere-asthenosphere interaction during slab roll-back and an insight into early Late Cretaceous (ca. 100-80 Ma) magmatic "flare-up" in southern Lhasa (Tibet).LITHOS,172,17-30.
MLA	Ma, Lin,et al."Early Late Cretaceous (ca. 93 Ma) norites and hornblendites in the Milin area, eastern Gangdese: Lithosphere-asthenosphere interaction during slab roll-back and an insight into early Late Cretaceous (ca. 100-80 Ma) magmatic "flare-up" in southern Lhasa (Tibet)".LITHOS 172(2013):17-30.