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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 PublicationInternational Geology Review
Volume53Issue:1Pages: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 1Nd(t) values from 114.6 to 219.2, 206Pb/204Pb ¼ 16.65–17.18, 207Pb/204Pb ¼ 15.33–15.54, and 208Pb/204Pb ¼ 36.83–38.29. Results suggest that these intermediate plutons were derived from different sources. The primary magmaderived 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.

KeywordIntrusive Complexes Foundering Underplating Sulu Belt Eastern China
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8252
Collection矿床地球化学国家重点实验室
Affiliation1.International Geology Review, Volume 53, 2011 - Issue 1
2.State Key Laboratory of Geological Processes and Mineral Resources , China University of Geosciences , Wuhan, 430074, China
3.State Key Laboratory of Geological Processes and Mineral Resources , China University of Geosciences , Wuhan, 430074, China
Recommended Citation
GB/T 7714
Shen Liu;Ruizhong Hu;Shan Gao;Caixia Feng;Hong Zhong;Youqiang Qi;Tao Wang;Guangying Feng;Yuhong Yang. 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]. International Geology Review,2011,53(1):61-83.
APA Shen Liu;Ruizhong Hu;Shan Gao;Caixia Feng;Hong Zhong;Youqiang Qi;Tao Wang;Guangying Feng;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.International Geology Review,53(1),61-83.
MLA Shen Liu;Ruizhong Hu;Shan Gao;Caixia Feng;Hong Zhong;Youqiang Qi;Tao Wang;Guangying Feng;Yuhong Yang."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".International Geology Review 53.1(2011):61-83.
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