Chemical weathering and formation of AL concretion from the igneous rock in Telupid Sabah

Muhammad Umar Sarimal and Baba Musta and Hardianshah Saleh (2024) Chemical weathering and formation of AL concretion from the igneous rock in Telupid Sabah.

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Abstract

Chemical weathering plays an important role in the transformation of igneous rocks into secondary mineral deposits. This study investigates physical characteristics of aluminium-rich concretions (Al-concretions) from extrusive basic igneous rocks in Telupid, Sabah and to identify the mineralogy and microstructure properties of the Al-concretions. The geology of Telupid mainly consists of peridotite, serpentinite, gabbro and basalt of the ophiolite sequence. To achieve this, we investigated the weathering profiles from different type of igneous rocks, collect adequate samples, and conducted laboratory analysis. Field observation shows the formation of concretion in the depth of 0.3 – 4.4 metres. About 51 concretion samples were collected from different profiles. The laboratory work consists of an X-ray diffraction and petrographic study. The results of analyses revealed that the Al-concretions deposits originated through a transformation process. Initially, the parent rock underwent significant alteration, and converting into laterite. Following this transformation, the laterite was subjected to further chemical weathering processes, which played a crucial role in its conversion into Al-concretion. The result of analyses also confirms the presence of gibbsite, diaspore and boehmite as dominant Alphases within these concretions. This early result enhances our understanding of concretion genesis in the study area dominated by igneous rock formations and offers broader implications for the potential of bauxite in the Telupid, Sandakan.

Item Type:	Proceedings
Keyword:	Chemical weathering, Aluminium, Concretion genesis, Ophiolite sequence, Laterite
Subjects:	Q Science > QE Geology > QE1-996.5 Geology > QE1-350.62 General Including geographical divisions T Technology > TA Engineering (General). Civil engineering (General) > TA1-2040 Engineering (General). Civil engineering (General) > TA703-712 Engineering geology. Rock mechanics. Soil mechanics. Underground construction
Department:	FACULTY > Faculty of Science and Natural Resources
Depositing User:	SITI AZIZAH BINTI IDRIS -
Date Deposited:	17 Mar 2025 11:08
Last Modified:	17 Mar 2025 11:08
URI:	https://eprints.ums.edu.my/id/eprint/43220

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