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Article by He Y
Article by Dong Y
Article by He Z
Article by Zhang Y
Article by Yang H
Article by Wang Q
Article by Chen H
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Petrogenesis of Early Cretaceous Ailinyuan granites from northern-central Da Hinggan mountains: constraints from zircon U-Pb age, geochemistry and Hf isotopes
HE Yue1, DONG Yu1, HE Zhong-hua1, ZHANG Yan-long1, YANG Hao1, WANG Qing-hai2, CHEN Hui-jun3
1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. International Center for Geoscience Research and Education in Northeast Asia, Jilin University, Changchun 130026, China;
3. Shenyang Center of Geological Survey, CGS, Shenyang 110034, China
Abstract: Zircon U-Pb geochronology, whole-rock geochemistry, and Lu-Hf isotope compositions were analyzed for the Ailinyuan granites in Chuoer area of Da Hinggan mountains. Ailinyuan pluton is composed mainly of monzogranite. Zircon U-Pb ages from two samples of 132 Ma and 137 Ma indicate that the Ailinyuan pluton formed in the Early Cretaceous. The geochemical data indicate that monzogranites are characterized by high SiO2 and K2O, but low total Fe2O3 and MgO, and moderate-weak negative europium anomalies with(Eu/Eu*)=0.46~1.07, ��REE=54.11×10-6~191.42×10-6,LREE/HREE=11.38~18.03, with significant fractionation of HREE and LREE[(La/Yb)N=12.12~23.52]. The monzogranites show enrichment in large ion lithophile elements (e.g., Rb, Ba, K) and depletion in high field-strength elements (e.g., Nb, Ta, Ti) and P. Zircon Lu-Hf isotope characteristics show that the two zircon samples from these granites have positive ��Hf(t) values of 3.9~7.9 and 2.9~8.0, respectively, and young Hf two-stage model ages of 709~942 Ma and 677~1 001 Ma, respectively. Combined with regional geology investigation, the authors suggested that the granitic magma was derived from partial melting of juvenile crustal material, possibly related to the subduction of the Paleo-Asian oceanic plate to the Xing'an Block.
Keywords: Da Hinggan mountains   Chuoer area   Ailinyuan   Early Cretaceous   granite   Hf isotope   subduction  
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DOI: 10.3969/j.issn.1004-5589.2017.03.006
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