Discuss the different processes of formation of late magmatic deposits.
Late magmatic deposits are a key category of ore deposits formed during the later stages of magmatic activity. These deposits are typically associated with the cooling and crystallization of magmatic bodies and are distinguished by their composition and mineralogy. The processes leading to the formation of late magmatic deposits are complex, involving a range of geological mechanisms that can take place at varying temperatures, pressures, and depths within the Earth's crust. Here are the primary processes involved in the formation of these deposits:
1. Fractional Crystallization
Fractional crystallization is a fundamental process in the formation of late magmatic deposits. As magma cools, minerals crystallize at different temperatures. The first minerals to crystallize are typically mafic minerals like olivine and pyroxene, and as the magma continues to cool, more felsic minerals like feldspar and quartz begin to form. As these minerals crystallize, they remove certain elements from the melt, causing the remaining liquid to become enriched in those elements that were not incorporated into the early-forming minerals. This selective enrichment can lead to the concentration of valuable metals, such as copper, nickel, and platinum group elements, in the residual melt. These concentrated minerals may eventually _____ _____ ______ __________ _____ _____ ______ ________ _________ __________ ______ _________.
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