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GEOREF RECORD

West Timor; a key for the eastern Indonesian geodynamic evolution

Michel Villeneuve, Herve Bellon, Rossana Martini, Agus Harsolumakso and Jean-Jacques Cornee
West Timor; a key for the eastern Indonesian geodynamic evolution
Bulletin de la Societe Geologique de France (June 2013) 184 (6): 569-582

Abstract

Timor Island was at time considered as an example of "accretionary prism" linked to the collision between the Australian block and the Banda arc. However, its geological evolution is more complex. Five main superimposed structural units are distinguished in West Timor. The today structure is the result of three main tectonic events that occurred during the Late Oligocene, Late Early Pliocene and Late Pliocene-Early Pleistocene times, respectively. Our field investigations in the 1990 to 2000 decade completed with geochemical analyses and K-Ar datings (Jurassic and Miocene ages) of magmatism allow to precise the geodynamic evolution of Timor that can be summarized as follows: a first block was detached from Gondwana (unit 2) and drifted to the Asiatic margin until the Late Oligocene when it collided with the Asiatic active margin (unit 3). Then, the new block formed by both 2 and 3 units drifted to the south during the Miocene and the Early Pliocene until it collided with the Australian margin (ASM), by the Late Early Pliocene. Then, the Australian and Timor blocks moved together towards the North-North East during the Late Pliocene until they collided with the Banda fore-arc (unit 4). Later on (Pleistocene), Timor island was capped by the "autochthon" (unit 5) and then on (Quaternary?) by the Banda volcanic arc northward thrusted over the South Banda basin. Taking in consideration its close relationships with both the Australian plate and the Eurasian one. Timor may be considered as a key area for building this geodynamical scenario of Indonesia.


ISSN: 0037-9409
EISSN: 1777-5817
Coden: BSGFAE
Serial Title: Bulletin de la Societe Geologique de France
Serial Volume: 184
Serial Issue: 6
Title: West Timor; a key for the eastern Indonesian geodynamic evolution
Affiliation: Universite de Provence, Centre de Sedimentologie et Paleontologie, Marseille, France
Pages: 569-582
Published: 201306
Text Language: English
Summary Language: French
Publisher: Societe Geologique de France, Paris, France
References: 72
Accession Number: 2014-004157
Categories: Solid-earth geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., 3 tables, geol. sketch maps
S10°30'00" - S08°19'60", E123°34'60" - E127°30'00"
Secondary Affiliation: Universite Europeenne de Bretagne, FRA, FranceUniversite de Geneve, CHE, SwitzerlandInstitute Technology Bandung, IDN, IndonesiaUniversite Montpellier, FRA, France
Country of Publication: France
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Societe Geologique de France. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201404
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