U-Pb zircon ages, geochemical and Sr-Nd-Pb isotopic constraints on the dating and origin of intrusive complexes in the Sulu orogen, eastern China

	U-Pb zircon ages, geochemical and Sr-Nd-Pb isotopic constraints on the dating and origin of intrusive complexes in the Sulu orogen, eastern China
	Shen Liu; Ruizhong Hu; Shan Gao; Caixia Feng; Hong Zhong; Youqiang Qi; Tao Wang; Guangying Feng; Yuhong Yang
	2011
Source Publication	intrusive complexes;foundering;underplating;Sulu belt;eastern China
Volume	53 Issue:1 Pages:61-83
Abstract	TPost-orogenic intrusive complexes from the Sulu belt of eastern China consist of pyroxene monzonites and dioritic porphyrites. We report new U–Pb zircon ages, geochemical data, and Sr–Nd–Pb isotopic data for these rocks. Laser ablation-inductively coupled plasma-mass spectrometry U–Pb zircon analyses yielded a weighted mean ²⁰⁶Pb/²³⁸U age of 127.4 ± 1.2 Ma for dioritic porphyrites, consistent with crystallization ages (126 Ma) of the associated pyroxene monzonites. The intrusive complexes are characterized by enrichment in light rare earth elements and large ion lithophile elements (i.e. Rb, Ba, Pb, and Th) and depletion in heavy rare earth elements and high field strength elements (i.e. Nb, Ta, P, and Ti), high (⁸⁷Sr/⁸⁶Sr)_i ranging from 0.7083 to 0.7093, low ϵ_Nd(t) values from ϵ14.6 to − 19.2, ²⁰⁶Pb/²⁰⁴Pb = 16.65–17.18, ²⁰⁷Pb/²⁰⁴Pb = 15.33–15.54, and ²⁰⁸Pb/²⁰⁴Pb = 36.83–38.29. Results suggest that these intermediate plutons were derived from different sources. The primary magma-derived pyroxene monzonites resulted from partial melting of enriched mantle hybridized by melts of foundered lower crustal eclogitic materials before magma generation. In contrast, the parental magma of the dioritic porphyrites was derived from partial melting of mafic lower crust beneath the Wulian region induced by the underplating of basaltic magmas. The intrusive complexes may have been generated by subsequent fractionation of clinopyroxene, potassium feldspar, plagioclase, biotite, hornblende, ilmenite, and rutile. Neither was affected by crustal contamination. Combined with previous studies, these findings provide evidence that a Neoproterozoic batholith lies beneath the Wulian region.
Subject Area	矿床地球化学
Indexed By	SCI
Language	英语
Document Type	期刊论文
Identifier	http://ir.gyig.ac.cn/handle/352002/7081
Collection	矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文矿床地球化学国家重点实验室
Recommended Citation GB/T 7714	Shen Liu,Ruizhong Hu,Shan Gao,et al. U-Pb zircon ages, geochemical and Sr-Nd-Pb isotopic constraints on the dating and origin of intrusive complexes in the Sulu orogen, eastern China[J]. intrusive complexes;foundering;underplating;Sulu belt;eastern China,2011,53(1):61-83.
APA	Shen Liu.,Ruizhong Hu.,Shan Gao.,Caixia Feng.,Hong Zhong.,...&Yuhong Yang.(2011).U-Pb zircon ages, geochemical and Sr-Nd-Pb isotopic constraints on the dating and origin of intrusive complexes in the Sulu orogen, eastern China.intrusive complexes;foundering;underplating;Sulu belt;eastern China,53(1),61-83.
MLA	Shen Liu,et al."U-Pb zircon ages, geochemical and Sr-Nd-Pb isotopic constraints on the dating and origin of intrusive complexes in the Sulu orogen, eastern China".intrusive complexes;foundering;underplating;Sulu belt;eastern China 53.1(2011):61-83.

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