Late Triassic granites from Bangka, Indonesia: A continuation of the Main Range granite province of the South-East Asian Tin Belt
| Autor: | Martin J. Whitehouse, Sayed Murtadha, Grahame J.H. Oliver, Su-Chin Chang, Claudia Teschner, Samuel Wai Pan Ng, Muhammad Hatta Roselee, Azman A. Ghani |
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| Rok vydání: | 2017 |
| Předmět: |
010504 meteorology & atmospheric sciences
Muscovite Geochemistry chemistry.chemical_element Mineralogy Geology engineering.material 010502 geochemistry & geophysics 01 natural sciences chemistry Magmatism engineering Suture (geology) Tin South east asian Biotite 0105 earth and related environmental sciences Earth-Surface Processes Zircon Hornblende |
| Zdroj: | Journal of Asian Earth Sciences. 138:548-561 |
| ISSN: | 1367-9120 |
| Popis: | The South-East Asian Tin. Belt is one of the most tin-productive regions in the world. It comprises three north-south oriented granite provinces, of which the arc-related Eastern granite province and the collision-related Main Range granite province run across Thailand, Singapore, and Indonesia. These tin-producing granite provinces with different mineral assemblages are separated by Paleo-Tethyan sutures exposed in Thailand and Malaysia. The Eastern Province is usually characterised by granites with biotite hornblende. Main Range granites are sometimes characterised by the presence of biotite muscovite. However, the physical boundary between the two types of granite is not well-defined on the Indonesian Tin Islands, because the Paleo-Tethyan suture is not exposed on land there. Both hornblende-bearing (previously interpreted as I-type) and hornblende-barren (previously interpreted as S-type) granites are apparently randomly distributed on the Indonesian Tin Islands. Granites exposed on Bangka, the largest and southernmost Tin Island, no matter whether they are hornblende-bearing or hornblende-barren, are geochemically similar to Malaysian Main Range granites. The average epsilon(Nd)(t) value obtained from the granites from Bangka (average epsilon(Nd)(t) = -8.2) falls within the range of the Main Range Province (-9.6 to -5.4). These granites have SIMS zircon U-Pb ages of ca. 225 Ma and ca. 220 Ma, respectively that are both within the period of Main Range magmatism (similar to 226-201 Ma) in the Peninsular Malaysia. We suggest that the granites exposed on Bangka represent the continuation of the Main Range Province, and that the Paleo-Tethyan suture lies to the east of the island. |
| Databáze: | OpenAIRE |
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