Cassiterite U–Pb ages from the Tin Islands, Indonesia, the southern end of the Southeast Asian tin province

Abstract

The Tin Islands of Indonesia (Riau Archipelago, Bangka and Belitung) constitute the southernmost part of the SE Asian tin province. U–Pb ages of cassiterite from three granite-related tin deposits (Pemali, Selumar and Tikus) and four placer tin deposits (Penyusuk, Sadab Perlang, Gunung Mudal Sincong and Riding Panjang) on Bangka and Belitung Islands were determined by in situ LA-ICPMS U–Pb dating. Cassiterite from the Pemali, Selumar and Tikus deposits has ²³⁸U/²⁰⁶Pb lower intercept U–Pb ages (2 s) of 217.2 ± 2.9 Ma, 223.7 ± 1.6 Ma and 212.5 ± 3.3 Ma, respectively. Alluvial cassiterite from the placer tin deposits of Penyusuk, Sadab Perlang, Gunung Mudal Sincong and Riding Panjang gave U–Pb ages (2 s) of 225.4 ± 3.6 Ma, 216.9 ± 4.2 Ma, 230.1 ± 2.5 Ma and 222.7 ± 1.4 Ma, respectively. These dates define the age of 230—210 Ma for tin mineralization in the Tin Islands, in alignment with the metallogenic ages of tin deposits in the Main Range belt of Malaysia and Thailand.