石英晶格中微量元素组成对成岩成矿作用的示踪意义  

Trace Elements in Quartz Lattice and Their Implications for Petrogenesis and Mineralization

作　　者：陈剑锋[1,2] 张辉[1] 

机构地区：[1]中国科学院地球化学研究所,贵阳550002 [2]中国科学院研究生院,北京100049

出　　处：《高校地质学报》2011年第1期125-135,共11页Geological Journal of China Universities

基　　金：国家重点基础研究发展计划"973"项目(2007CB411303;2006CB403508);国家科技部支撑计划"305"项目(2007BAB25B01);国家自然科学基金项目(40673052)联合资助

摘　　要：相对其它造岩矿物,石英因其成分和结构具有特殊的稳定性,在地质演化过程中"携带"有更多的成岩成矿信息。由于不同地质环境下石英晶格中微量元素的地球化学行为具有明显差异,造成岩浆-热液演化不同阶段以及不同地质背景下形成的石英结构及其晶格中微量元素种类、含量显著不同。因此,利用阴极发光和微区原位测试技术对石英的结构以及晶格中微量元素分布特征的研究,总结影响微量元素通过类质同象形式进入石英晶格的因素,找出特定环境下灵敏度高的元素或元素组合,可以对不同来源的石英进行源区示踪,并可获取成岩成矿中有用的地质-地球化学信息。此外,石英晶格中的Al,Ti含量与石英形成温度之间的线性关系可作为地质温度计而广泛应用。Quartz is widely distributed in the igneous, sedimental and metamorphic rocks, and hydrothermal ore deposits. As its specific stability in composition and texture, quartz does carry much more petrogenetic and metallogenic information than other rock-forming minerals. Quartz, originated from different stages of magmatic-hydrothermal system and/or different geological settings, shows great differences in its lattice texture and distribution of trace elements, because of its different behavior in the history of geological processes. To interprate the factors affecting trace elements entering quartz lattice and find out high-sensitive elements in particular geological environments, the trace element distribution and textural characteristics of quartz lattice are investigated by use of micro-area in situ technique and cathodeluminescence. Therefore, the provenance of quartz formation can be traced, and then useful geological-geochemical information about the petrogenesis and metallization can be deduced. Moreover, as shown in this paper that there is a linear relationship between Al, Ti contents and the formation temperature of quartz. It might be extensively used as a tentative geothermometer.

关 键 词：微量元素 成岩成矿 阴极发光 地质温度计 石英晶格 

分 类 号：P578.494[天文地球—矿物学] P595[天文地球—地质学]