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|Title:||Palaeogeography of Late Triassic red-beds in Singapore and the Indosinian Orogeny||Authors:||GRAHAME JOHN HENDERSON OLIVER
|Issue Date:||25-Oct-2013||Citation:||GRAHAME JOHN HENDERSON OLIVER, Prave, A. (2013-10-25). Palaeogeography of Late Triassic red-beds in Singapore and the Indosinian Orogeny. Journal of Asian Earth Sciences 76 : 214-224. ScholarBank@NUS Repository. https://doi.org/10.1016/j.jseaes.2013.01.022||Abstract:||A red-bed facies of the Upper Triassic Jurong Formation has been logged on Sentosa Island, Singapore. An overall coarsening and thickening-upward pattern is well developed. The lower part of the section is dominated by purple-red, massive to finely laminated illite-smectite-kaolin-rich mudstones containing thin, discontinuous lenses of fine sandstone marked by low-angle lamination and small ripples. One dinosaur-like foot print has been discovered in a loose block of red mudstone. It is concluded that this is a lacustrine sequence and it is proposed to name the lake, Lake Sentosa. The upper part of the sequence consists of flat-laminated to trough cross-bedded medium-grained sandstone and granule to cobble conglomerates alternating with purple-red mudstone. The mudstone-sandstone packages are arranged in decametre-scale coarsening-upward cycles. The channelling and decimetre-scale cross-bedding characterising the sandstone and conglomeratic beds is evidence for deposition by flashy fluvial flood processes, possibly feeding into the lake as a fresh water delta. One possible dinosaur trackway in granule size conglomerate has been located. Detrital zircon U-Pb ages vary from 2.7. Ba to 209. Ma with significant populations at ~245. Ma and 220. Ma. These ages throw light on the timing of the Indosinian Orogeny. The molasse red-beds of the Jurong Formation were deposited in a half graben formed in the hangingwall of the Bukit Timah Fault when central Peninsular Malaysia went into extension following the climax of the Indosinian Orogeny in the Late Triassic. © 2013 Elsevier Ltd.||Source Title:||Journal of Asian Earth Sciences||URI:||http://scholarbank.nus.edu.sg/handle/10635/114170||ISSN:||13679120||DOI:||10.1016/j.jseaes.2013.01.022|
|Appears in Collections:||Staff Publications|
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