Neogene sediment provenance and paleogeography of SE Sulawesi, Indonesia
Neogene syn-and post-orogenic sedimentary rocks in Sulawesi are important to understand the history of collision of Australian continental crust with SE Asia. However, they have received relatively little attention, and have generally been considered to be molasse-type deposits of similar characteri...
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sg-ntu-dr.10356-1625082022-10-29T23:31:08Z Neogene sediment provenance and paleogeography of SE Sulawesi, Indonesia Nugraha, Abang Mansyursyah Surya Hall, Robert Earth Observatory of Singapore Science::Geology Light and Heavy Minerals Palaeogeography Neogene syn-and post-orogenic sedimentary rocks in Sulawesi are important to understand the history of collision of Australian continental crust with SE Asia. However, they have received relatively little attention, and have generally been considered to be molasse-type deposits of similar characteristics across Sulawesi—the Celebes Molasse. New field sedimentological observations, results from heavy mineral studies and detrital zircon U–Pb geochronology, together with conventional sandstone petrography identify three important provenance shifts, that can be correlated with significant tectonic events and enable the reconstruction of the Neogene palaeogeography of SE Sulawesi. The first provenance shift was related to the Early Miocene collision of Australian crust and the North Sulawesi volcanic arc, accompanied by ophiolite emplacement in East Sulawesi, marked by a change from pre-collision carbonates to ultramafic-rich clastics of the Bungku Formation. A second change in the Late Miocene was marked by input of abundant metamorphic detritus including blueschists into the Pandua Formation indicating exhumation of Oligo-Miocene subduction zone material. The third provenance change, of Mio-Pliocene age, was from the ophiolite- and blueschist-rich Pandua Formation to the quartz-rich Langkowala Formation, and records blocking of the ophiolite debris pathways by the rise and progressive unroofing of low- to high-grade metamorphic rocks. The Neogene sedimentary rocks of SE Sulawesi record Early Miocene collision and ophiolite emplacement, followed by extension which led to exhumation of Mesozoic and metamorphic rocks, driven by Banda subduction rollback. Nanyang Technological University Published version This project was funded by the SE Asia Research Group of Royal Holloway University of London, Earth Observatory of Singapore, Nanyang Technological University, which is supported by a consortium of oil companies. 2022-10-26T02:09:55Z 2022-10-26T02:09:55Z 2022 Journal Article Nugraha, A. M. S. & Hall, R. (2022). Neogene sediment provenance and paleogeography of SE Sulawesi, Indonesia. Basin Research, 34(5), 1714-1730. https://dx.doi.org/10.1111/bre.12682 0950-091X https://hdl.handle.net/10356/162508 10.1111/bre.12682 2-s2.0-85131016610 5 34 1714 1730 en Basin Research © 2022 The Authors. Basin Research published by International Association of Sedimentologists and European Association of Geoscientists and Engineers and John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. application/pdf |
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Science::Geology Light and Heavy Minerals Palaeogeography Nugraha, Abang Mansyursyah Surya Hall, Robert Neogene sediment provenance and paleogeography of SE Sulawesi, Indonesia |
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Neogene syn-and post-orogenic sedimentary rocks in Sulawesi are important to understand the history of collision of Australian continental crust with SE Asia. However, they have received relatively little attention, and have generally been considered to be molasse-type deposits of similar characteristics across Sulawesi—the Celebes Molasse. New field sedimentological observations, results from heavy mineral studies and detrital zircon U–Pb geochronology, together with conventional sandstone petrography identify three important provenance shifts, that can be correlated with significant tectonic events and enable the reconstruction of the Neogene palaeogeography of SE Sulawesi. The first provenance shift was related to the Early Miocene collision of Australian crust and the North Sulawesi volcanic arc, accompanied by ophiolite emplacement in East Sulawesi, marked by a change from pre-collision carbonates to ultramafic-rich clastics of the Bungku Formation. A second change in the Late Miocene was marked by input of abundant metamorphic detritus including blueschists into the Pandua Formation indicating exhumation of Oligo-Miocene subduction zone material. The third provenance change, of Mio-Pliocene age, was from the ophiolite- and blueschist-rich Pandua Formation to the quartz-rich Langkowala Formation, and records blocking of the ophiolite debris pathways by the rise and progressive unroofing of low- to high-grade metamorphic rocks. The Neogene sedimentary rocks of SE Sulawesi record Early Miocene collision and ophiolite emplacement, followed by extension which led to exhumation of Mesozoic and metamorphic rocks, driven by Banda subduction rollback. |
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Earth Observatory of Singapore |
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Earth Observatory of Singapore Nugraha, Abang Mansyursyah Surya Hall, Robert |
format |
Article |
author |
Nugraha, Abang Mansyursyah Surya Hall, Robert |
author_sort |
Nugraha, Abang Mansyursyah Surya |
title |
Neogene sediment provenance and paleogeography of SE Sulawesi, Indonesia |
title_short |
Neogene sediment provenance and paleogeography of SE Sulawesi, Indonesia |
title_full |
Neogene sediment provenance and paleogeography of SE Sulawesi, Indonesia |
title_fullStr |
Neogene sediment provenance and paleogeography of SE Sulawesi, Indonesia |
title_full_unstemmed |
Neogene sediment provenance and paleogeography of SE Sulawesi, Indonesia |
title_sort |
neogene sediment provenance and paleogeography of se sulawesi, indonesia |
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2022 |
url |
https://hdl.handle.net/10356/162508 |
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1749179192424005632 |