| 云南墨江金矿床硅质岩的地质地球化学特征及其意义 |
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| 引用本文： | 谢桂青,胡瑞忠,方维萱,漆亮.云南墨江金矿床硅质岩的地质地球化学特征及其意义[J].矿物学报,2001,21(1):95-101. |
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| 作者姓名： | 谢桂青 胡瑞忠 方维萱 漆亮 |
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| 作者单位： | 中国科学院地球化学研究所矿床地球化学开放研究实验室, |
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| 基金项目： | 云南省院校科技合作项目!(YK980 0 8 3 )，国家重点研
究发展规划项目!(G19990 43 2 0 0 ) |
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| 摘 要： | 墨江金矿床厂组中下段硅质岩具有典型的沉积构造，岩石富集∑Fe和As 、Sb、Bi、Ga等微量元素（相对于地壳克拉克值），而相对贫AI2O3；稀土元素以总量（∑REE）低，负铈异常为特征，与热水沉积的硅质岩特征相似。在判别硅质岩形成与作用的一系列主量和微量元素图解上，本区的硅质岩位于热水沉积作用范围，但四十八两山段硅质岩有趋近于正常化学沉积作用。利用硅质岩的氧同位素计算出它的形成温度为128－146℃。地质、地球化学特征表明本区硅质岩的形成与热水沉积作用有关，但四十八两山段硅质岩受到正常化学沉积作用的影响。、
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| 关 键 词： | 硅质岩 热水沉积 地球化学 金矿床 矿床地质 氧同位素 硅质岩 |
| 文章编号： | 1000-4734(2001)01-0095-07 |
GEOCHEMICAL CHARACTERISTICS OF CHERTS IN MOJIANG GOLD DEPOSIT |
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| Xie Guiqing,Hu Ruizhong,Fang Weixuan,Qi Liang.GEOCHEMICAL CHARACTERISTICS OF CHERTS IN MOJIANG GOLD DEPOSIT[J].Acta Mineralogica Sinica,2001,21(1):95-101. |
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| Authors: | Xie Guiqing Hu Ruizhong Fang Weixuan Qi Liang |
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| Abstract: | Cherts in the lower and middle members of the Jichang Formation have the characteristics of typical sediment structure. The cherts are characterized by high contents of HREE, similar to those of hydrothermal sedimentation origin. As viewed from a series of diagrams including the ∑Fe/Ti versus Al/(Al+∑Fe+Mn) diagram of modern marine sediments and the SiO2 versus Al2O3 diagram of cherts and ∑Fe-Mn-(Co+Ni+Cu)×10 diagram of different sediments, the cherts referred to here are located in a hydrothermal sediment area, but the Sishibaliang cherts show a tendency towards normal chemical sedimentation. The δ18O values of the cherts show that the precipitation temperatures of the cherts vary from 128～146 ℃.Therefore, geological and geochemical characteristics of the cherts indicate that the rocks were derived from hydrothermal sedimentation in the Mojiang gold deposit, but the middle member of the Jinchang Formation had been influenced by normal chemical sedimentation. |
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| Keywords: | chert hydrothermal sediment geochemistry Mojiang gold deposit |
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