Zircon U-Pb geochronological and Hf isotopic constraints on petrogenesis of Late Mesozoic intrusions in the southeast Hubei Province, Middle-Lower Yangtze River belt (MLYRB), East China

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	Zircon U-Pb geochronological and Hf isotopic constraints on petrogenesis of Late Mesozoic intrusions in the southeast Hubei Province, Middle-Lower Yangtze River belt (MLYRB), East China
	Xie, GQ (Xie, Guiqing); Mao, JW (Mao, Jingwen); Zhao, HJ (Zhao, Haijie)
刊名	LITHOS
	2011
卷号	125 期号:1-2 页码:693-710
关键词	Zircon U-Pb dating Hf isotopes Petrogenesis Middle-Lower Yangtze River belt (MLYRB)
ISSN号	0024-4937
英文摘要	During the Late Mesozoic. extensive magmatism and associated ore deposits were developed in the southeast Hubei Province, Middle-Lower Yangtze River metallogenic belt (MLYRB), East China. To understand the petrogenesis of the intrusions in the area, we performed in situ zircon U-Pb and Hf isotopic analyses on 14 samples from the Fengshangdong stock, and from the Echeng, Tieshan, Wangbaoshan-Jinshandian and Yangxin batholiths. Three major suites of intrusive rocks are recognized in the southeast Hubei Province (1) 141-146 Ma granodiorite and granite porphyries (associated with 143-144 Ma porphyry-skarn Cu-Mo deposits) have enriched radiogenic Hf isotopic compositions (epsilon Hf (t) = -9.5 to -1.6), comparable to those of Cretaceous pyroxene diorites. trachyandesites, and basalts (epsilon Hf (t) = -8.9 to -1.3) in the MLYRB, which were derived from an enriched lithospheric mantle. (2) Voluminous 136-143 Ma gabbros, diorites, and quartz diorites (associated with 137-144 Ma skarn Cu-Fe. Fe-Cu. and Au-Cu deposits) have variable Hf isotopic compositions (epsilon Hf (t) = -19.1 to -5.4). indicating an origin via the hybridization of enriched mantle-derived mafic magma and variable amounts of ancient lower-crustal components. (3) 127-133 Ma diorites, quartz diorites, and granites (associated with 132-133 Ma skarn Fe deposits) characterized by a wide range of epsilon Hf (t) values (-28.2 to -6.4), suggest the assimilation of various ancient lower-crustal materials by enriched mantle-derived basaltic magma. The intrusions of Suites 1 and 2 are characterized by high Sr contents (329-2087 ppm), and high Sr/Yb (36-1710) and (La/Yb)(N) ratios(17.6-172). but low Yb contents (0.45-1.82 ppm) and do not show negative Eu anomalies (delta Eu = 0.74-1.4). The intrusions have radiogenic Sr-Nd isotopic compositions (epsilon Nd(t) = -10.0 to -3.4 and (Sr-87/Sr-86)(i) = 0.7054-0.7084). Compared with the intrusions of Suites 1 and 2, rocks of Suite 3 have relatively low Sr contents (60.5-327 ppm), and low Sr/Yb (33.0-315) and (La/Yb)(N) ratios (2.28-30.0), but relatively high Yb contents (1.04-5.17 ppm) and significant negative Eu anomalies (delta Eu = 0.22-0.73). The rocks of Suite 3 are characterized by a wide range of radiogenic Sr-Nd isotopes with epsilon Nd (t) values of -12.5 to -4.9 and (Sr-87/Sr-86)(i) = 0.7057-0.7085. The proposed magma sources, combined with the geochemical and Sr-Nd isotopic differences between these three suites of intrusive rocks, indicate that Late Mesozoic magmatic activity in the southeast Hubei Province, MLYRB was associated with lithospheric thinning induced by asthenospheric upwelling at that time. (C) 2011 Elsevier B.V. All rights reserved.
学科主题	火成岩岩石学
WOS关键词	PLASMA-MASS SPECTROMETRY ; CU-FE-AU ; VOLCANIC-ROCKS ; ANHUI PROVINCE ; LOWER REACHES ; GEODYNAMIC IMPLICATIONS ; GEOLOGICAL IMPLICATIONS ; IGNEOUS COMPLEXES ; CONTINENTAL-CRUST ; METALLOGENIC BELT
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000292663600043
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39292]
专题	中国地质调查局
作者单位	Chinese Acad Geol Sci, Key Lab Metallogeny & Mineral Assessment, Inst Mineral Resources, Beijing 100037, Peoples R China
推荐引用方式 GB/T 7714	Xie, GQ ,Mao, JW ,Zhao, HJ . Zircon U-Pb geochronological and Hf isotopic constraints on petrogenesis of Late Mesozoic intrusions in the southeast Hubei Province, Middle-Lower Yangtze River belt (MLYRB), East China[J]. LITHOS,2011,125(1-2):693-710.
APA	Xie, GQ ,Mao, JW ,&Zhao, HJ .(2011).Zircon U-Pb geochronological and Hf isotopic constraints on petrogenesis of Late Mesozoic intrusions in the southeast Hubei Province, Middle-Lower Yangtze River belt (MLYRB), East China.LITHOS,125(1-2),693-710.
MLA	Xie, GQ ,et al."Zircon U-Pb geochronological and Hf isotopic constraints on petrogenesis of Late Mesozoic intrusions in the southeast Hubei Province, Middle-Lower Yangtze River belt (MLYRB), East China".LITHOS 125.1-2(2011):693-710.