排序方式： 共有48条查询结果，搜索用时 203 毫秒
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甘肃金窝子金矿地质地球化学特征 总被引：3，自引：0，他引：3
金窝子金矿构造上地处星星峡古生代岛弧南缘,红柳河断裂以南,包括南、北两矿区。根据金矿化与岩体的空间关系,分产在花岗岩体中的金矿 围岩中的金矿两种类型。按矿化又可分为含金石英脉型和蚀变破碎带型。矿床在窨上和成因上与金窝子岗岩关系密切。矿床地球化学研究表明,硫为深源硫,来自深部岩浆。包体以液相包体为主,其次有少量气态包体,ＣＯ２多相包体。包体成分类型属于ＣＯ２－Ｈ２Ｏ－ＮａＣｌ型。热液水以岩浆水为主, 相似文献
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Trends in chemical concentrations in mussels and oysters collected along the US coast: update to 2003 总被引：2，自引：0，他引：2
With data from the annual analyses of mussels and oysters collected in 1986-1993 from sites located throughout the coastal United States [O'Connor, T.P., 1996. Trends in chemical concentrations in mussels and oysters collected along the US coast from 1986 to 1993. Mar. Environ. Res. 41, 183-200] showed decreasing trends, on a national scale, for chemicals whose use has been banned or has greatly decreased and that concentrations of most other chemicals were neither increasing nor decreasing. With data through 2003 those conclusions still apply. National median concentrations of synthetic organic chemicals and cadmium continue to decrease. The added data show that concentrations of lindane and high molecular weight PAHs are also decreasing on a national scale. For metals other than cadmium and zinc (in mussels), the added data reveal trends at more sites than in 1993 but no additional national trends. However, the longer time series has revealed several local and regional trends. 相似文献
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通过内蒙黄岗梁—孟恩陶勒盖多金属矿床稳定同位素地质特征的研究,对成矿物质来源进行了探讨。硫有两个硫源,其一为上地幔岩浆硫,其二为多种成因的地壳硫。铅为正常铅,为来自于地槽区深部岩浆的造山带型铅。根据稳定同位素特征和成矿地质背景,将区内矿床分为Sn、Ag、Cu、Pb、Zn与W、Sn、Be、Fe两个成矿系列。成矿流体主要来源于岩浆水和大气降水。成矿物质主要来源于重熔、同熔两大系列岩浆,岩浆-大气降水对流循环攫取了二叠纪地层中部分矿质参与成矿。 相似文献
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论中国火山次火山岩—斑岩金银矿成矿系列 总被引：12，自引：4，他引：8
研究了中国火山次火山岩－斑岩金银矿成矿系列的划分、成矿构造环境、矿床类型、成矿形式。该系列金银矿划分为６个亚系列：大陆边缘与高钾钙生英安－流纹岩有关的Ａｇ－Ａｕ成矿亚系列;古生代岛弧区与富钠高碱玄武岩拉斑玄武岩有关的Ａｕ（Ｃｕ、Ｎｉ、Ｃｒ）成矿亚系列;陆内裂谷、裂陷区富碱高钠中基－中酸性夺有关的Ａｕ－Ｃｕ－Ｆｅ成矿亚系列;地槽褶皱带钙碱性安山－流纹质火山岩有关的Ａｇ－Ｓｎ－Ｃｕ－Ｐｂ－Ｚｎ－（Ａｕ 相似文献