Journal Title
Title of Journal: Int J Earth Sci Geol Rundsch
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Abbravation: International Journal of Earth Sciences
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Publisher
Springer-Verlag
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Authors: Feng Guo Weiming Fan Chaowen Li Xiaofen Gao Laicheng Miao
Publish Date: 2008/08/30
Volume: 98, Issue: 6, Pages: 1395-1411
Abstract
An early Cretaceous 135 ± 2 Ma felsic volcanic suite of dacite and rhyolite from Huolinhe NE China is characterized by large ion lithophile element and light REE enrichment and high field strength element HFSE eg Nb and Ta and Ti–P depletion and bulk silicate earthlike Sr 87Sr/86Sri = 070409–070481 quite radiogenic Nd ε Ndt = +398 to +588 Pb eg 206Pb/204Pbi = 1846–1855 and Hf ε Hft ~+92 isotope compositions Compared with contemporaneous mafic rocks in the region these felsic rocks have even higher Nd and Hf isotopic ratios precluding an origin through differentiation of coeval mantlederived magmas Isotope calculation results suggest that these magmas were derived from a preexistent mixture composed of mainly juvenile crust 70–80 and a subordinate recycled crustal component 20–30 having highly radiogenic Sr and Pb and unradiogenic Nd and Hf About 25–30 melting of such a mixed source produced the primary dacitic magma The rhyolites which have relatively low MgO FeO Al2O3 CaO TiO2 P2O5 Na2O Ba Sr REE HFSE and Y were differentiates of the dacites after removal of a fractional assemblage of hornblende + plagioclase + Kfeldspar + apatite + zircon Considering the prolonged events from 262 to 130 Ma that produced such highly positive ε Nd felsic igneous rocks in the region we prefer a preMesozoic crustal growth model related to arc accretion associated with the PaleoAsian Ocean subductionThe authors would like to thank Profs XH Zhou FY Wu XL Xiong and HR Smithies for providing valuable suggestions on an earlier version of the manuscript Constructive reviews by Simon Wilde and an anonymous reviewer greatly improve the manuscript Thanks are also due to Mr L Qi Dr Liang and Dr JH Yang for their help in trace element ICPMS Sr–Nd and zircon Hf isotope analyses respectively Prof DY Liu is thanked for help with the SHRIMP zircon U–Pb dating
Keywords:
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