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1. �й����ʴ�ѧ(����) �����ѧ����ԴѧԺ, ���� 100083;
2. �й����ʵ���� ������Դ��������, ���� 100083;
3. �й����ʵ����, ���� 100037;
4. �侯�ƽ𲿶ӵڶ�֧��, ���ͺ��� 010010
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Zircon LA-ICP-MS geochronology and trace element features of rocks deep in northern margin of Qaidam tectonic belt: implications to evolution of Quanji massif basement
LIU Yi-min1,2, REN Shou-mai3, GUO Tian-xu2, WANG Hao1,2, ZHOU Zhi2, WANG Sheng-jian2, DING Hai-sheng4
1. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;
2. Oil & Gas Survey, China Geological Survey, Beijing 100083, China;
3. China Geological Survey, Beijing 100037, China;
4. No.2 Gold Geological Party of CAPF, Huhhot 010010, China
Abstract: LA-ICP-MS zircon U-Pb geochronology and trace elements of amphibolite and granodiorite from the Quanji massif basement in the northern margin of Qaidam tectonic belt were studied. The upper and lower intersection point ages of magmatic zircons from amphibolite are 2 396±26 Ma and 905±140 Ma respectively, of which the former represents the crystalline age of zircon and the latter represents the age of the partial Pb-loss in the zircons. Magmatic zircons from amphibolite are characterized by high U/Yb (0.1~1), low Hf (<1 000×10-6) and U (<150×10-6), indicating the magma is related to the enrichment of mantle. On discrimination plots of zircon trace element, all samples fall into continental arc and ocean-island, showing that they are formed in back-arc basin. Magmatic zircons from granodiorite yield weighted average age of 484±21 Ma. Magmatic zircons from granodiorite are characterized by high U/Yb (>1) and high U (average value=640×10-6), indicating that the magma is from typical crust source. Discrimination plots of zircon trace elements indicate that these zircons are formed in continental arc. The results of the study show that the basement of the Quanji massif consist of Precambrian and Early Paleozoic rocks. The complexity of the basement of the Quanji massif is related to the subductions of ocean crust and continental collisions in Quanji massif.
Keywords: Quanji massif   evolution of basement   zircon U-Pb dating   zircon trace element  
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DOI: 10.3969/j.issn.1004-5589.2018.02.002
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