Formation of the Jurassic Changboshan-Xieniqishan highly fractionated I-type granites, northeastern China: implication for the partial melting of juvenile crust induced by asthenospheric mantle upwelling
作者： Daohan Zhang , Junhao Wei , Lebing Fu , Huayong Chen , Jun Tan
DOI: 10.1002/GJ.2531
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摘要: Zircon U–Pb ages, major and trace elements, Sr, Nd Hf isotope compositions of the Changboshan-Xieniqishan (CX) intrusion from Great Xing'an Range (GXAR), northeastern China, were studied to investigate its derivation, evolution geodynamic significance. Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) zircon dating yields an emplacement age 161 ± 2 Ma for CX intrusion. Bulk-rock analyses show that this is characterized by high SiO2, Na2O K2O, but low MgO, CaO P2O5. They are enriched in large-ion lithophile elements light rare earth with marked Eu anomalies (mostly 0.36 0.65), depleted heavy field strength elements. Most samples have relatively (87Sr/86Sr)i values (0.70423–0.70457), eNd(t) fluctuating between −0.4 2.3. The eHf(t) zircons varies 5.4 8.7. Sr–Nd modelling results, combination young model ages (760–986 549–728 Ma, respectively) presence relict zircons, indicate may originate partial melting juvenile crust, minor contamination recycled crustal components, then underwent extensive fractional crystallization K-feldspar, plagioclase, biotite, sphene, apatite, allanite. Considering widespread granitoids coeval volcanic rocks, we contend formed extensional environment related upwelling asthenospheric mantle induced subduction Palaeo-Pacific plate, rather than a lithospheric delamination model. Copyright © 2013 John Wiley & Sons, Ltd.
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