Geochemistry and Petrogenesis of the Tongshankou and Yinzu Adakitic Intrusive Rocks and the Associated Porphyry Copper‐Molybdenum Mineralization in Southeast Hubei, East China
Geochemistry and Petrogenesis of the Tongshankou and Yinzu Adakitic Intrusive Rocks and the Associated Porphyry Copper‐Molybdenum Mineralization in Southeast Hubei, East China
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DOI：
10.1111/j.1751-3928.2004.tb00195.x
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发表时间：
2004-06
期刊：
影响因子：
1.4
通讯作者：
Qiang Wang;Zhenhua Zhao;Z. Bao;Ji‐Feng Xu;Wei Liu;Chaofeng Li;Z. Bai;Xiaolin Xiong
中科院分区：
文献类型：
--
作者：
Qiang Wang;Zhenhua Zhao;Z. Bao;Ji‐Feng Xu;Wei Liu;Chaofeng Li;Z. Bai;Xiaolin Xiong
抽象。对鄂东南晚侏罗世铜山口岩体和殷祖岩体进行了对比研究。前者与斑岩铜钼矿化密切相关，而后者几乎没有金属矿化，尽管两者的位置非常接近。铜山口花岗闪长斑岩和殷祖花岗闪长岩的地球化学特征与埃达克岩相似，高Al_2O_3、Sr含量和La/Yb、Sr/Y比值，富Na_2 O，贫Y、Yb，Eu异常很弱，Sr正异常。铜山口埃达克质岩相对富集SiO2、K2 O、MgO、Cr、Ni、Sr，亏损Y、Yb，稀土分异程度高，Eu正异常，而银祖岩Eu负异常很弱或不明显;和（4）同位素上具有相对较高的ePNd（t）值（-5.19至-5.38）和较低的初始87 Sr/86 Sr比值（0.7060至0.7062），印支埃达克质岩石ePNd（t）值较低（-7.22 ~-8.67），初始87 Sr/86 Sr比值较高（0.7065 ~ 0.7074）。
Abstract. The late Jurassic Tongshankou and Yinzu plutons in southeast Hubei have been investigated for their contrasting metal mineralization features. The former is closely associated with porphyry Cu‐Mo mineralization, while the latter is barren of metal mineralization, althouth both are located very close to each other. The Tongshankou granodiorite porphyries and the Yinzu granodiorites are geochemically similar to adakites, e.g., high Al2O3 and Sr contents and La/Yb and Sr/Y ratios, enriched in Na2O, depleted in Y and Yb, very weak Eu anomalies and positive Sr anomalies. However, different geochemi‐cal characteristics exist between the two plutons: the Tongshankou adakitic rocks (1) are relatively enriched in SiO2, K2O, MgO, Cr, Ni, and Sr and depleted in Y and Yb; (2) have higher degree REE differentiation; (3) have positive Eu anomalies in contrast with very weak negative or unclear Eu anomalies in the Yinzu rocks; and (4) isotopically have relatively higher ePNd(t) values (‐5.19 to ‐5.38) and lower initial 87Sr/86Sr ratios (0.7060 to 0.7062), while the Yinzu adakitic rocks have relatively lower ePNd(t) values (‐7.22 to ‐8.67) and higher initial 87Sr/86Sr ratios (0.7065 to 0.7074).