The Pemali tin deposit,Bangka, Indonesia |
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| Authors: | M O Schwartz Surjono |
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| Institution: | (1) Bundesanstalt für Geowissenschaften und Rohstoffe, P.O. Box 51 01 53, 51 Hannover, Germany;(2) Directorate of Mineral Resources, Bandung, Indonesia |
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| Abstract: | The Pemali tin deposit is located in a Triassic granite pluton the magmatic evolution of which is characterized by a decrease of compatible Ca, Mg, Ti, P and Zr in the sequence: medium- to coarse-grained biotite granite, megacrystic medium-grained biotite granite, two-mica granite/muscovite granite. The tin mineralization is confined to the two-mica granite and consists of disseminated cassiterite as well as greisen-bordered veins. The highly evolved muscovite granite is tin-barren and is distinguished from the two-mica granite by its low mica content and low loss-on-ignition values. The fluid inclusions in quartz and fluorite of the two-mica granite and of the greisen homogenize in the 115–410 °C temperature range; the salinities are in the range of 0.4–23 equiv wt% NaCl and the CO2 concentrations are < 2 mole%. |
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