Chemical composition of the Tertiary black shales of West Sabah, East Malaysia

Amer M. Burgan and Che Aziz Ali and Sanudin Tahir (2008) Chemical composition of the Tertiary black shales of West Sabah, East Malaysia. Chinese Journal of Geochemistry, 27 (1). pp. 28-35. ISSN 1000-9426

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Abstract

The X-ray fluorescence and ICP methods were used to analyze 60 outcrop samples of black shale, of which 15 were collected from Belait, 15 from the Setap Shale, 15 from Temburong, and 15 from the Trusmadi formations. The average compositions of the shales from the study area are 64.62%, 63.95%, 62.32%, 63.84% SiO2, 1.84%, 2.14%, 2.04%, 1.99% MgO, 2.55%, 3.12%, 2.89%, 2.72% K2O, 0.32%, 0.30%, 0.32%, 0.53% CaO, 5.86%, 6.06%, 7.14%, 6.60% Fe2O3, 207 × 10-6, 180 × 10-6, 213 × 10-6, 200 × 10-6 Rb, and 56 × 10-6, 49 × 10-6, 50 × 10-6, 32 × 10-6 Sr for the Setap Shale, Temburong, Belait and Trusmadi samples, respectively. The high Rb/Sr ratios of 3.8, 3.7, 4.2, and 6.1 are attributed to the lowest contents of Sr due to reducing conditions prevailing. The high Rb/K ratio suggests either brackish marine or rapid deposition that prevented equilibrium between Rb and K in the shales and marine waters. © Science Press 2008.

Item Type:	Article
Keyword:	Brackish water, Chemical composition, Tertiary black shale, West Sabah, XRF
Subjects:	Q Science > QE Geology > QE1-996.5 Geology > QE1-350.62 General Including geographical divisions
Department:	SCHOOL > School of Science and Technology
Depositing User:	ADMIN ADMIN
Date Deposited:	18 Apr 2011 14:36
Last Modified:	30 Jul 2021 15:45
URI:	https://eprints.ums.edu.my/id/eprint/2730

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