Accelerated mafic weathering in Southeast Asia linked to late Neogene cooling

Type Article
Date 2023-03
Language English
Author(s) Bayon Germain1, Patriat MartinORCID1, Godderis Yves2, Trinquier AnneORCID1, de Deckker Patrick3, Kulhanek Denise K.4, Holbourn Ann4, Rosenthal Yair5
Affiliation(s) 1 : Univ Brest, CNRS, Ifremer, Geo-Ocean, F-29280 Plouzané, France
2 : Géosciences- Environnement Toulouse, CNRS-Université Paul Sabatier, F-31400 Toulouse, France
3 : The Australian National University, Research School of Earth Sciences, Canberra, ACT 2601, Australia
4 : Institute of Geosciences, Christian-Albrechts-University of Kiel, 24118 Kiel, Germany
5 : Department of Marine and Coastal Sciences and Department of Earth and Planetary Sciences, Rutgers, State University of New Jersey, New Brunswick, NJ 08901, USA
Source Science Advances (2375-2548) (American Association for the Advancement of Science), 2023-03 , Vol. 9 , N. 13 , P. eadf3141 (10p.)
DOI 10.1126/sciadv.adf3141
WOS© Times Cited 1

Arc-continent collision in Southeast Asia during the Neogene may have driven global cooling through chemical weathering of freshly exposed ophiolites resulting in atmospheric CO2 removal. Yet, little is known about the cause-and-effect relationships between erosion and the long-term evolution of tectonics and climate in this region. Here, we present an 8-million-year record of seawater chemistry and sediment provenance from the eastern Indian Ocean, near the outflow of Indonesian Throughflow waters. Using geochemical analyses of foraminiferal shells and grain size–specific detrital fractions, we show that erosion and chemical weathering of ophiolitic rocks markedly increased after 4 million years (Ma), coincident with widespread island emergence and gradual strengthening of Pacific zonal sea-surface temperature gradients. Together with supportive evidence for enhanced mafic weathering at that time from re-analysis of the seawater 87Sr/86Sr curve, this finding suggests that island uplift and hydroclimate change in the western Pacific contributed to maintaining high atmospheric CO2 consumption throughout the late Neogene.

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Bayon Germain, Patriat Martin, Godderis Yves, Trinquier Anne, de Deckker Patrick, Kulhanek Denise K., Holbourn Ann, Rosenthal Yair (2023). Accelerated mafic weathering in Southeast Asia linked to late Neogene cooling. Science Advances, 9(13), eadf3141 (10p.). Publisher's official version : , Open Access version :