Bulletin of the Geological Society of Malaysia, Volume 20, August 1986, pp. 401 – 414

Distribution of major and some trace elements of some granites from Bangka, Indonesia

J.M. SITANGGANG

P.T. Timah (Persero), Pangkal Pinang, Indonesia

Abstract: Concentration ranges and arithmetic means of major and four trace elements of the Menumbing, Pelangas and Tempilang granites in Bangka are discussed. The whole rock chemistry of these three granites do not show any great differences, except for Ca²⁺ which, in the Pelangas granite will correspond to the high-Ca ²⁺ granite.

Trace elements of Ba and Sr are greater in the Pelangas granite than in the Menumbing and Tempilang granites.

The Na⁺/K⁺ and Al³⁺/Na⁺ + K⁺ + 1/2Ca2⁺ ratios indicate that the granites have similarities to the S-type granites of White et al. (1977) which may have a sedimentary origin. The Ca-Sr, K-Rb, Ba-Sr, Rb-Sr and Fe-Mg ratios compared with previous average granite data show that the granites in the study area are highly differentiated rocks. The relationship of Sn content with the concentration of Rb and Rb/Sr ratio are positive but is inverse to the K/Rb ratio.

https://doi.org/10.7186/bgsm20198619