Abstract
In 1975 a major five-year geochemical project was started in Sumatra north of the equator. This project, undertaken jointly by the British Geological Survey and the Directorate of Mineral Resources (Republic of Indonesia), covered an area of 190,000 km2, or about 10% of the total land surface of Indonesia, and combined systematic geological mapping with regional geochemical prospecting.
The survey and follow-up mineral exploration studies have revealed tin-bearing regions of primary exploration interest. One result has been the recognition that tin is much more widely distributed than was known previously. In particular, stream sediment geochemistry shows that some parts of the eastern Barisan are anomalous in tin. Regional geological correlations indicate that this area has a similar geological history to that of South Thailand and Peninsular Malaysia.
Preliminary follow-up work in two areas, Mabundar-Kutacane and Hatapang-Rantau Prapat, has confirmed the presence of tin mineralization as cassiterite. Both areas are underlain by sediments of Carbo-Permian age intruded by Late Cretaceous granites. The Hatapang pluton consists mainly of coarse-grained porphyritic, medium, equigranular biotite granite. According to major and trace element contents, these granites are of ‘S’ or ilmenite-type and have the character of specialized granites, which are usually associated with Sn/W deposits. They resemble granites in the Phuket tin mineralization zone of Thailand.
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© 1988 United Nations New York
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Johari, S. (1988). Geochemistry and Tin Mineralization in Northern Sumatra, Indonesia. In: Hutchison, C.S. (eds) Geology of Tin Deposits in Asia and the Pacific. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-72765-8_42
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DOI: https://doi.org/10.1007/978-3-642-72765-8_42
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