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The geochemical characteristics of Mesozoic intermediate-acid intrusives of the Tongling area and its metallogenesis-geodynamic implications.
其他题名铜陵地区中生代中酸性侵入岩的地球化学特征及其成矿-地球动力学意义
Wang, YL; Wang, Y; Zhang, Q; Jia, XQ; Han, S; Jia XQ(贾秀琴); Han S(韩松)
2004
发表期刊ACTA PETROLOGICA SINICA
卷号20期号:2页码:325-338
通讯作者Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China ; Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China ; Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China
文章类型Article
摘要Mesozoic intermediate-acid intrusive rocks from Tongling area have the characteristics of adakites in geochemistry, they show SiO2 greater than or equal to 56%, high Al2O3 content (> 15%) Na2O/K2O > 1, HREE depletion, (La/Yb)(N) > 12, slightly negative Eu anomaly (Eu-./Eu = 0.71 (0.96), high Sr concentration (> 750mug/g) and high Sr/Y ratios (> 38). The rocks are divided arbitrarily into three types according to their HREE patterns: (1) flat HREE pattern, with high Yb content (> 1.8mug/g); (2) flat HREE pattern, with Yb < 1.8mug/g and (Ho/Yb)(N) approximate to 1; (3) depleted HREE pattern, with Yb < 1.8mug/g and (Ho/Yb)(N) approximate to 1.2. The high K2O content and the similarity to the composition of the lower crust of Yangtze basement in isotopic composition of the rocks exclude the possibility of direct derivation from slab partial melting, but suggest that the rocks are the products of partial melting of underplating basaltic rocks in the lower crust. The differences among the three types are not resulted from fractional crystallization or continental contamination. Differences in the source composition due to variable percentage of the mantle and the lower crust components are probably the main reasons for the differences of the three types. It is assumed that the adakitic rocks in Tongling and other areas in east China are related to crust accretion and thickening of east China in Mesozoic. The further discussion for the assumption will be helpful to understand the geodynamic process and evolution of east China in Mesozoic.
关键词intermediate-acid intrusive rocks geochemistry adakite tongling mesozoic metallogenesis
学科领域Geology
研究领域[WOS]Geology ; Geology
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语种英语
研究领域[WOS]Geology ; Geology
WOS类目Geology
WOS记录号WOS:000221036700013
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被引频次:41[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/236985
专题多学科研究中心
作者单位中国科学院高能物理研究所
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Wang, YL,Wang, Y,Zhang, Q,et al. The geochemical characteristics of Mesozoic intermediate-acid intrusives of the Tongling area and its metallogenesis-geodynamic implications.[J]. ACTA PETROLOGICA SINICA,2004,20(2):325-338.
APA Wang, YL.,Wang, Y.,Zhang, Q.,Jia, XQ.,Han, S.,...&韩松.(2004).The geochemical characteristics of Mesozoic intermediate-acid intrusives of the Tongling area and its metallogenesis-geodynamic implications..ACTA PETROLOGICA SINICA,20(2),325-338.
MLA Wang, YL,et al."The geochemical characteristics of Mesozoic intermediate-acid intrusives of the Tongling area and its metallogenesis-geodynamic implications.".ACTA PETROLOGICA SINICA 20.2(2004):325-338.
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