eprintid: 13442
rev_number: 2
eprint_status: archive
userid: 1
dir: disk0/00/01/34/42
datestamp: 2023-11-10 03:28:00
lastmod: 2023-11-10 03:28:00
status_changed: 2023-11-10 01:51:11
type: article
metadata_visibility: show
creators_name: Baioumy, H.
creators_name: Lehmann, B.
creators_name: Ahmed Salim, A.M.
creators_name: Al-Kahtany, K.
creators_name: El-Sorogy, A.
title: Geochemical characteristics of black shales from Triassic turbidites, Peninsular Malaysia: Implications for their origin and tectonic setting
ispublished: pub
keywords: Alumina; Aluminum oxide; Biogeochemistry; Deposition; Kaolinite; Ocean currents; Oil shale; Organic compounds; Sandstone; Sediment transport; Tectonics; Trace elements; Weathering, Black shales; Malaysia; Origin; Tectonic settings; Triassic; Turbidites, Shale, black shale; geochemistry; paleoenvironment; source rock; tectonic evolution; tectonic setting; trace element; Triassic; turbidite; turbidity, Malaysia; West Malaysia
note: cited By 4
abstract: Field observations indicate that shale intervals of Triassic turbidites from the Semanggol and Semantan formations in the Peninsular Malaysia occur as thick-bedded dark grey to black shales overlying conglomerate, pebbly sandstone, thick-bedded sandstone, and sandstone-shale interbeds. This sequence characterises a submarine fan depositional setting where the conglomerate, sand and sand/shale intercalations represent an inner and middle fan setting in a shallow marine environment, whereas the black shales were deposited in a deeper marine environment of the outer fan. The redox-sensitive trace-metal inventory (V, Ni, Cr) of the black shales is dominated by clastic input and the depositional environment is likely oxic/suboxic. TOC values are highly variable (3.2 ± 3.3 wt) and derive from washed-in allochthonous organic material. The Semantan Formation black shales have features of a felsic source rock, while black shales from the Semanggol Formation were inherited from more intermediate rocks as constrained by their Al2O3/TiO2 ratios. Similar Al2O3/SiO2 ratios as well as CIA values suggest wet paleoclimatic conditions and intensive weathering of source rocks during the Late Triassic deposition of both shales. The tectonic setting deduced from immobile-trace-metal ratios is a passive margin for the Semanggol black shales and a fore-arc-basin setting for the Semantan black shales. The inconsistency between the interpreted geological and geochemical tectonic settings, particularly for the Semanggol black shales, is due to the recycled nature of the sediment sources that were deposited in a different tectonic setting. The clay fractions of both formations comprise of abundant illite and kaolinite, with some smectite in few samples from the Semantan Formation. Based on illite contents (38�68) and IC values (0.45�0.62° �2θ), the studied black shales are in the late diagenesis stage. The organic matter in the Semanggol and Semantan black shales is characterized by kerogen Type III proposing a terrestrial origin of the organic matter, which was transported along with the clastic sediments by turbidity currents. © 2019 Elsevier Ltd
date: 2020
publisher: Elsevier Ltd
official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85075387615&doi=10.1016%2fj.marpetgeo.2019.104137&partnerID=40&md5=b1bbe8291707dbafd7feaaa6f2c89ea7
id_number: 10.1016/j.marpetgeo.2019.104137
full_text_status: none
publication: Marine and Petroleum Geology
volume: 113
refereed: TRUE
issn: 02648172
citation:   Baioumy, H. and Lehmann, B. and Ahmed Salim, A.M. and Al-Kahtany, K. and El-Sorogy, A.  (2020) Geochemical characteristics of black shales from Triassic turbidites, Peninsular Malaysia: Implications for their origin and tectonic setting.  Marine and Petroleum Geology, 113.   ISSN 02648172