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Article by Wang W
Article by Yang H
Article by Liu T
Article by Ma Z
Article by Zheng J
Article by Hu J
Article by Wei X
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2. �й�������װ���첿���侯�ƽ��һ�ܶ�, ������ 150086
ժҪ�� ���˰��뱱������ս��������㷺��������������ɽ�Ҽ��������塣LA-ICP-MS�ʯU-Pb���ս���廨��������λ����Ϊ121.0±0.8 Ma������Χ��¶�İ����������������緢����Ϊ136.9±1.3 Ma�����߾��γ����������������ѧ�����ϣ����߾����ڹ����ʸ߼ظƼ���-������ϵ�У���SiO2����K2O��Na2O����Mg��Ti��΢��Ԫ�ظ�����������ʯԪ��Rb��K��Ba��LREE������߳�ǿԪ��Nb��Ta��Ti��HREE������ϡ�����Է��죨��La/Yb��N=11~23.2�������е�-����Eu���쳣����Eu=0.35~0.82�������߾�ͬԴ�ҽ��ݻ������������ǰ���о����������ս��������������������γ��ں���ɽ����ײ��Ĺ��컷������������չ�Ĵ�ع��챳������Щ����Ҳ����������ɹ�-�����Ŀ�����٪��������������պ���ɽ�����չ�����йء�
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Chronology, geochemistry and tectonic implications of Early Cretaceous igneous rocks in Xinlin Zhanbeicun area, northern Great Hinggan Mountain
WANG Wen-dong1, YANG Hua-ben1, LIU Tao2, MA Zhi-zhong2, ZHENG Ji-lin1, HU Jun-hai1, WEI Xiao-yong1
1. No.3 Gold Geological Party of CAPF, Harbin 150086, China;
2. No.1 Gold Geological General Party of CAPF, Harbin 150086, China
Abstract: Late Mesozoic volcanic rocks and intrusive rocks widely occurred in Xinlin Zhanbeicun area of northern Greater Hinggan Mountain. Zircon U-Pb dating using the LA-ICP-MS method gives the emplacement age of 121.0±0.8 Ma for Zhanbeicun intrusive rocks and 136.9±1.3 Ma for Baiyingaolao Formation rhyolites distributed around the Zhanbeicun intrusive rocks. The results suggested that the intrusive rocks and rhyolites were formed in Early Cretaceous. Moreover the rocks belong to high K calc-alkaline-shoshonite series in geochemistry, and exhibit high SiO2, K2O, Na2O and low Mg, Ti. The trace elements generally have a similar variation trend, e.g. enrichment of LILE(Rb, K, Ba)and LREE, and depletion of HFSE (Nb, Ta, Ti)and HREE, with significant fractionation of LREE and HREE ((La/Yb)N=11~23.26) and weak-medium Eu anomalies (��Eu=0.35~0.82). This indicates that the intrusive rocks and rhyolites have the same sources. Combined with previous studies, it is suggested that the Early Cretaceous igneous rocks in Zhanbeicun area are originated from partial melting of the lower crust and formed in a post-orogenic extensional tectonic setting related to the closure of Mongolia-Okhotsk ocean during Middle Jurassic-Early Cretaceous.
Keywords: Xinlin Zhanbeicun   Early Cretaceous   igneous rocks   geochemistry   northern Great Hinggan Mountain  
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DOI: 10.3969/j.issn.1004-5589.2018.01.003
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