Timescale dependent sedimentary record during the past 130 kyr from a tropical mixed siliciclastic–carbonate shelf edge and slope: Ashmore Trough (southern Gulf of Papua)

Gianni Mallarino; Jason M. Francis; Stephan J. Jorry; James J. Daniell; AndrÉ W. Droxler; Gerald R. Dickens; Luc Beaufort; Samuel J. Bentley; Bradley N. Opdyke; Larry C. Peterson

doi:10.1111/sed.12867

journal article Open Access May 09, 2021

Timescale dependent sedimentary record during the past 130 kyr from a tropical mixed siliciclastic–carbonate shelf edge and slope: Ashmore Trough (southern Gulf of Papua)

Gianni Mallarino

Jason M. Francis Stephan J. Jorry James J. Daniell AndrÉ W. Droxler Gerald R. Dickens Luc Beaufort Samuel J. Bentley

Bradley N. Opdyke Larry C. Peterson

Sedimentology Vol. 68 No. 6 pp. 2606-2648 · Wiley

View at Publisher Save 10.1111/sed.12867

Abstract

AbstractIn tropical and sub‐tropical mixed siliciclastic–carbonate depositional systems, fluvial input and in situ neritic carbonate interact over space and time. Despite being the subject of many studies, controls on partitioning of mixed sediments remains controversial. Mixed sedimentary records, from Ashmore Trough shelf edge and slopes (southern Gulf of Papua), are coupled with global sea‐level curves and anchored to Marine Isotope Stage stratigraphy to constrain models of sediment accumulation at two different timescales for the past 130 kyr: (i) 100 kyr scale for last glacial cycle; and (ii) millennial scale for last deglaciation. During the last glacial cycle, carbonate production and accumulation were primarily controlled by sea‐level fluctuations. Export of neritic carbonate to the slopes was initiated during re‐flooding of previously exposed reefs and continued during Marine Isotope Stage 5e and 1 interglacial sea‐level highs. Siliciclastic fluxes to the slope were controlled by interplay of sea level, shelf physiography and oceanic currents. Heterogeneous accumulation of siliciclastic mud on the slope, took place during Marine Isotope Stage 5d to Marine Isotope Stage 3 sea‐level fall. Siliciclastics reached adjacent depocentres during Marine Isotope Stage 2. Coralgal reef and oolitic–skeletal sand resumed at the shelf edge during the subsequent stepwise sea‐level rise of the last deglaciation. Contemporaneous, abrupt siliciclastic input from increased precipitation and fluvial discharge illustrates that climate controlled deglacial sedimentation. Siliciclastic input persisted until ca 8.5 ka. Carbonate accumulation waned at the shelf edge after ca 14 ka, whereas it increased on the slopes since ca 11.5 ka, when previously exposed reef and bank tops were re‐flooded. When comparing the last sea‐level cycle sedimentation patterns of the southern Gulf of Papua with other coeval mixed systems, sea level and shelf physiography emerge as primary controls on deposition at the 100 kyr scale. At the millennial scale, siliciclastic input was also controlled by climate change during the unstable atmospheric and oceanic conditions of the last deglaciation.

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Details

Published: May 09, 2021
Vol/Issue: 68(6)
Pages: 2606-2648
License: View

Authors

G

Gianni Mallarino

Department of Physical and Applied Geology Eötvös Loránd University (ELTE) Pázmány Péter sétány 1/c Budapest 1117 Hungary

J

Jason M. Francis

Chevron 1500 Louisiana Street Houston TX 77002 USA

S

Stephan J. Jorry

Centre de Brest IFREMER Géosciences Marines BP70 Plouzané 29280 France

J

James J. Daniell

Earth and Environmental Sciences James Cook University Townsville QLD 4811 Australia

A

AndrÉ W. Droxler

Department of Earth, Environmental and Planetary Sciences Rice University 6100 Main St Houston Texas 77005 USA

G

Gerald R. Dickens

Department of Geology Trinity College Dublin Dublin 02 Ireland

L

Luc Beaufort

Aix Marseille Univ, CNRS, IRD, INRAE, Coll. France CEREGE Aix‐en‐Provence France

S

Samuel J. Bentley

Department of Geology and Geophysics Louisiana State University E235 Howe Russell Geoscience Complex Baton Rouge Louisiana 70803 USA

B

Bradley N. Opdyke

Research School of Earth Sciences The Australian National University Building 142 Mills Road Acton ACT 2601 Australia

L

Larry C. Peterson

Rosenstiel School of Marine and Atmospheric Science University of Miami 4600 Rickenbacker Causeway Miami FL 33149 USA

Funding

National Science Foundation Award: OCE 0305688

Cite This Article

Gianni Mallarino, Jason M. Francis, Stephan J. Jorry, et al. (2021). Timescale dependent sedimentary record during the past 130 kyr from a tropical mixed siliciclastic–carbonate shelf edge and slope: Ashmore Trough (southern Gulf of Papua). Sedimentology, 68(6), 2606-2648. https://doi.org/10.1111/sed.12867

Timescale dependent sedimentary record during the past 130 kyr from a tropical mixed siliciclastic–carbonate shelf edge and slope: Ashmore Trough (southern Gulf of Papua)

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