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首页> 外文会议>International Workshop on Tethyan Orogenesis and Metallogeny in Asia and Cooperation among Institutions of Higher Education: Extended Abstract Volume >Application of geochemical fingerprinting to mineral deposit classification and exploration
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Application of geochemical fingerprinting to mineral deposit classification and exploration

机译：地球化学指纹图谱在矿床分类与勘探中的应用

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Geochemical fingerprinting of igneous rocks in the Geological Record is now a well-established procedure.For lavas, methodologies are based on the so-called immobile elements, elements which are relatively unaffected by weathering and metamorphism Fingerprinting normally involves three stages: 1) classification of rock type using an immobile element proxy;2) identification of tectonically defined magma type;and 3) petrogenetic diagrams which provide more detail on the precise tectonic setting.Of the plutonic rocks, there are usually sufficient numbers of fresh granite samples that the complete bulk-rock compositions can be used, but gabbros and peridotites are normally best-studied using resistant minerals such as clinopyroxene and spinel.Alteration is even more important around most mineral deposits, especially (but not exclusively) in the case of hydrothermal deposits.Using immobile elements to classify the rock type of highly metasomatised rocks is then particularly important.These immobile elements then provide an opportunity to classify ore deposits in terms of tectonic setting.Thus VMS deposits may be assigned a tectonic setting of formation based on geochemical fingerprinting.The same is possible for ore deposits associated with granites, gabbros and peridotites.This may be useful in the construction of accurate Ore Deposit Models.In terms of assigning probabilities of economic significance to particular compositions, this goal can presently only be achieved to a limited extent.However, there are well-defined links between host rock composition and type of mineralization.
机译：地质记录中火成岩的地球化学指纹图谱现已成为公认的程序。对于熔岩而言，方法基于所谓的固定元素，这些元素相对不受风化和变质的影响指纹通常包括三个阶段：1）分类使用固定元素代理的岩石类型; 2）构造定义的岩浆类型的识别;以及3）岩石成因图，提供了有关精确构造背景的更多详细信息。在古生代岩石中，通常有足够数量的新鲜花岗岩样品可以完全散装可以使用岩石成分，但是辉长岩和橄榄岩通常使用抗斜辉石和尖晶石等抗性矿物来研究最好。大多数矿物沉积物的改变甚至更为重要，特别是（但不仅限于）热液沉积物。因此，对高度交代岩石的岩石类型进行分类的元素就显得尤为重要。固定元素然后提供了根据构造背景对矿床进行分类的机会。因此，可以根据地球化学指纹图谱为VMS矿床指定构造构造背景，与花岗岩，辉长岩和橄榄岩相关的矿床也可能如此。在为特定成分分配具有经济意义的概率方面，目前只能在有限的范围内实现该目标。然而，在宿主岩石成分与成矿类型之间存在明确的联系。

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