EPSC 445 Lecture Notes - Lecture 1: Gabbro, Partition Coefficient, Dissociation Constant
13 Feb 2015
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Magmatic ni cu pge cr deposits: difficult to transport significant amount of nickels in hydrothermal fluids, pge: you can move them in hydrothermal fluids but difficult to do so then for ex. Gold moves in low concentration of hydrothermal fluids. Distribution of magmatic sulphide deposits: sudbury: refers to basins that accounts for 35% of world nickel production, norilsk: big nickel producer, these 2 represent 50% of world nickel, bushveld: largest lead and zinc. 80% of platinum group of elm in one syst. Magmatic sulphide ore: few fragments of solid sulphides dominantly pyrrhotite with pentlandite, sulphide magma: related to other magmas ; it turns out gabbroic and peridotitic magmas under certain circum. Can dissolve a lot of sulphur and under some circum. Exsolve separate sulphide liquid: gabbroic melt can dissolve high conc of sulphur; forming sulphid globules (dominated in iron). Bulk composition of sulphide liquid is close to bulk comp of.
