Journal article

Increased fluvial runoff terminated inorganic aragonite precipitation on the Northwest Shelf of Australia during the early Holocene

Maximilian Hallenberger, Lars Reuning, Stephen J Gallagher, Stefan Back, Takeshige Ishiwa, Beth A Christensen, Kara Bogus

SCIENTIFIC REPORTS | NATURE PUBLISHING GROUP | Published : 2019

Abstract

Inorganic precipitation of aragonite is a common process within tropical carbonate environments. Across the Northwest Shelf of Australia (NWS) such precipitates were abundant in the late Pleistocene, whereas present-day sedimentation is dominated by calcitic bioclasts. This study presents sedimentological and geochemical analyses of core data retrieved from the upper 13 meters of IODP Site U1461 that provide a high-resolution sedimentary record of the last ~15 thousand years. Sediments that formed from 15 to 10.1 ka BP are aragonitic and characterised by small needles (<5 µm) and ooids. XRF elemental proxy data indicate that these sediments developed under arid conditions in which high marin..

View full abstract

Grants

Awarded by German Science foundation (DFG)


Awarded by ARC Basin Genesis Hub


Funding Acknowledgements

This study was performed on samples collected during IODP Expedition 356 (Indonesian Throughflow) and was supported by a grant of the German Science foundation (DFG, RE 2697/4-1). Funding was provided by the Australian IODP office and the ARC Basin Genesis Hub (IH130200012) to S.G. Janet Rethemeyer (University of Cologne) is thanked for generating <SUP>14</SUP>C age data and Uwe Wollenberg and Philipp Binger (RWTH Aachen University) for the support in creating XRD and thin-section data. EasyCompany is gratefully acknowledged for providing the EasyCore software under an Academic User License Agreement.