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Journal of Petrology Advance Access originally published online on September 3, 2007
Journal of Petrology 2007 48(10):1973-1997; doi:10.1093/petrology/egm046
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

Sources and Petrogenesis of Late Triassic Dolerite Dikes in the Liaodong Peninsula: Implications for Post-collisional Lithosphere Thinning of the Eastern North China Craton

Jin-Hui Yang1,*, Jin-Feng Sun1, Fukun Chen1, Simon A. Wilde2 and Fu-Yuan Wu1

1State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy Of Sciences, PO Box 9825, Beijing 100029, China
2Department of Applied Geology, Curtin University of Technology, PO Box U1987, Perth, WA 6845, Australia

RECEIVED NOVEMBER 15, 2006; ACCEPTED JULY 18, 2007


  Abstract

A combination of major and trace element, whole-rock Sr, Nd and Hf isotope, and zircon U–Pb isotopic data are reported for a suite of dolerite dikes from the Liaodong Peninsula in the northeastern North China Craton. The study aimed to investigate the source, petrogenesis and tectonic setting of the dikes. Sensitive high-resolution ion microprobe U–Pb zircon analyses yield a Late Triassic emplacement age of ~213 Ma for these dikes, post-dating the collision between the North China and Yangtze cratons and consequent ultrahigh-pressure metamorphism. Three geochemical groups of dikes have been identified in the Liaodong Peninsula based on their geochemical and Sr–Nd–Hf isotope characteristics. Group 1 dikes are tholeiitic, with high TiO2 and total Fe2O3 and low MgO contents, absent to weak negative Nb and Ta anomalies, variable (87Sr/86Sr)i (0·7060–0·7153), {varepsilon}Nd(t) (– 0·8 to –6·5) and {varepsilon}Hf(t) (–2·7 to –7·8) values, and negative {Delta}{varepsilon}Hf(t) (–1·1 to –7·8). They are inferred to be derived from partial melting of a relatively fertile asthenospheric mantle in the spinel stability field, with some upper crustal assimilation and fractional crystallization. Group 2 dikes have geochemical features of high-Mg andesites with (87Sr/86Sr)i values of 0·7063–0·7072, and negative {varepsilon}Nd(t) (–3·0 to –9·5) and {varepsilon}Hf(t) (–3·2 to –10·1) values, and may have originated as melts of foundered lower crust, with subsequent interaction with mantle peridotite. Group 3 dikes are shoshonitic in composition with relatively low (87Sr/86Sr)i values (0·7061–0·7063), and negative {varepsilon}Nd(t) (–13·2 to –13·4) and {varepsilon}Hf(t) (–11·0 to –11·5) values, and were derived by partial melting of an ancient, re-enriched, refractory lithospheric mantle in the garnet stability field. The geochemical and geochronological data presented here indicate that Late Triassic magmatism occurred in an extensional setting, most probably related to post-orogenic lithospheric delamination.

KEY WORDS: mafic dike; asthenospheric mantle; lithospheric mantle; delamination; North China Craton

*Corresponding author. Telephone: +86-10-6200-7900 (O). Fax: +86- 10-6201-0846. E-mail: jinhui{at}mail.igcas.ac.cn


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This article has been cited by other articles:


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J.-H. Yang, F.-Y. Wu, S. A. Wilde, F. Chen, X.-M. Liu, and L.-W. Xie
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