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Debris-slides, olistoliths and turbidites; keys to understanding the tectonostratigraphic affinities of a terrane block in a young orogenic belt, Timor-Leste

Jose Nano, David W. Haig, Edwin Ornai Fraga, Moises Soares, Isaias Santos Barros, Eujay McCartain and Peter Baillie
Debris-slides, olistoliths and turbidites; keys to understanding the tectonostratigraphic affinities of a terrane block in a young orogenic belt, Timor-Leste
Journal of the Geological Society of London (September 2023) 181 (1)

Abstract

Timor lies at the centre of a rapidly evolving orogenic belt. Matebian Range, one of its largest mountains, was previously mapped as Lower Miocene neritic Cablac Limestone and regarded as allochthonous (viz. Banda Terrane). New analyses have demonstrated a disjunct stratigraphy, extending from the Lower Jurassic to lowest Miocene and encompassing neritic to abyssal strata. Positioning each stratigraphic unit (six new) on a time vs. bathymetry plot and identifying clast types in conglomerates and turbidites allows reconstruction of changes in provenance to depocentres through time. Terrane progression from the northern margin of Gondwana to the southern Sundaland margin (Asia) and then back to the northwest margin of the Australian continent is indicated involving progressive amalgamation and rifting and substantial episodes of uplift, particularly during the Middle Eocene and the Late Oligocene. The youngest unit (Late Oligocene-earliest Miocene) was deposited adjacent a rapidly rising hinterland (southern Sundaland) very different from that on the coeval Australian margin. The study provides a model for the tectonostratigraphic reconstruction of limestone-dominated mountains in young orogenic belts and demonstrates the importance of using sedimentary clasts in mass-flow deposits to interpret ages and depositional environments of reworked material and to stitch together tectonostratigraphic pathways through time. Supplementary material: https://doi.org/10.6084/m9.figshare.c.6852387


ISSN: 0016-7649
EISSN: 2041-479X
Coden: JGSLAS
Serial Title: Journal of the Geological Society of London
Serial Volume: 181
Serial Issue: 1
Title: Debris-slides, olistoliths and turbidites; keys to understanding the tectonostratigraphic affinities of a terrane block in a young orogenic belt, Timor-Leste
Affiliation: Instituto do Petroleo e Geologia-Instituto Publico, Dili, East Timor
Pages: Article jgs2023-079
Published: 20230928
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 94
Accession Number: 2023-077298
Categories: Sedimentary petrologyStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
S09°26'60" - S08°19'60", E125°00'00" - E127°19'60"
Secondary Affiliation: University of Western Australia, AUS, Australia
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2023, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 202346
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