Geochemistry and Genesis of the Late Jurassic Granitoids at Northern Great Hinggan Range: Implications for Exploration
查看参考文献90篇
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文摘
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The Longgouhe and Ershiyizhan intrusions of the Late Jurassic,located in the Upper Heilongjiang Basin of the northern Great Hinggan Range,are closely related to porphyry Cu-Au mineralizations.In lithology the intrusions are quartz diorite,quartz monzodiorite and granodiorite of high-K caic-alkaline series,with minor aspects of shoshonite series.Their SiO_2 and Al_2O_3 contents range from 61.37% to 66.59% and 15.35% to 17.06%,respectively.The MgO content ranges from 2.02% to 3.47%,with Mg~# indices of 44-59.The (La/Yb)_N and Eu/Eu~* values range from 16.85 to 81.73 and 0.68 to 0.93,respectively,showing strong differentiation rare earth element (REE) patterns similar to those of adakites.The rocks are enriched in Ba,Sr and light REE (LREE),obviously depleted in Nb and Ta,slightly depleted in Rb and Ti,and poor in Yb and Y,with Yb and Y contents of 0.31-1.32 ppm and 4.32-12.07 ppm,respectively.As indicated by Sr/Y ratios of 67.74-220.60,the rocks are characterized by Iow-Y and high-Sr contents,which characterize the adakites in the world.Holistically,geochemical tracers suggest that the interested intrusions are adakitic rocks.Given that the Paleo-Asian Ocean and Mongol-Okhotsk Ocean were closed in the Late Paleozoic and Permian-Middle Jurassic,respectively,the interested intrusions should be formed by partial melting of delaminated crust,which had been thickened during coilisional orogeny between the Siberian and Mongolian-Sinokorean continents. |
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来源
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Acta Geologica Sinica
,2010,84(2):321-332 【核心库】
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关键词
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adakite
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geochemistry
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Late Jurassic
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continental collision
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thickened crust
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Great Hinggan Range
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地址
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1.
Guangzhou Institute of Geochemistry, the Chinese Academy of Sciences, Key Laboratory of Metallogenic Dynamics, Guangdong, Guangzhou, 510640
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Peking University, Key Laboratory of Orogen and Crust Evolution, Beijing, 100871
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College of Earth Sciences, Jilin University, Jilin, Changchun, 130061
4.
Shenyang Institute of Geology and Mineral Resources, China Geological Survey, Liaoning, Shenyang, 110032
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语种
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英文 |
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文献类型
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研究性论文 |
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ISSN
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1000-9515 |
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学科
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地质学 |
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文献收藏号
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CSCD:3824842
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2
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Late Jurassic Cu-Mo Mineralization at the Zhashui-Shanyang District,South Qinling,China:Constraints from Re-Os Molybdenite and Laser Ablation-Inductively Coupled Plasma Mass Spectrometry U-Pb Zircon Dating
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