The enigma of rare Quaternary oolites in the Indian and Pacific Oceans: A result of global oceanographic physicochemical conditions or a sampling bias?
- Autor(en)
- Stephen J. Gallagher, Lars Reuning, Tobias Himmler, Jorijntje Henderiks, David De Vleeschouwer, Jeroen Groeneveld, Alireza Rastegar Lari, Craig S. Fulthorpe, Kara A. Bogus, Willem Renema, Helen V. McGregor, Michelle Kominz, Gerald Auer, Soma Baranwal, Isla S. Castañeda, Beth A. Christensen, Daniel Franco, Michael Gurnis, Christian Haller, Yuxin He, Takeshige Ishiwa, Hokuto Iwatani, Resti Samyati Jatiningrum, Chelsea A. Korpanty, Eun Young Lee, Emily Levin, Briony L. Mamo, Cecilia McHugh, Benjamin F. Petrick, Donald C. Potts, Hideko Takayanagi, Wenfang Zhang
- Abstrakt
Marine ooids are iconic indicators of shallow seawater carbonate saturation state, and their formation has traditionally been ascribed to physicochemical processes. The Indo-Pacific stands out as a region devoid of oolites, particularly during the Quaternary: the “ooid enigma”. Here we present results from recent coring by the International Ocean Discovery Program (IODP Expedition 356) off west Australia that shows that ooid horizons are common in Pleistocene strata up to 730,000 years old. Extensive “ooid factories” were created due to the presence of long-lived tidally influenced flat–topped tropical platforms suitable for intermittent ooid accretion over hundreds to thousands of years during highstands and times of lower sea level. This work suggests marine ooids may actually be more common in Indo-Pacific than previously reported. Past global ocean alkalinity was elevated during Pleistocene glacial periods and continental climate was generally more arid in the Indo-Pacific region compared to interglacials and the Holocene. Therefore, increased aridity associated with higher alkalinity conditions during the glacials facilitated ooid precipitation on adjacent tropical carbonate platforms particularly offshore from arid Australia. This confluence of factors suggests that more “ooid factories” may be encountered by further coring Indo-Pacific regions with Pleistocene flat long-lived carbonate shelves. However, Indo-Pacific Quaternary ooid occurrences outside Australia are rare, suggesting that the Northwest Shelf may be a unique archive of this non-skeletal precipitate. Further investigations into the petrography and geochemistry of pre-Holocene ooid occurrences will provide insights into their origin and the relative role of biotic, physicochemical and other factors in their formation.
- Organisation(en)
- Institut für Geologie
- Externe Organisation(en)
- Western Michigan University, University of Melbourne, Christian-Albrechts-Universität zu Kiel, Universität Bremen, Geological Survey of Norway, Uppsala University, Curtin University of Technology, University of Texas, Austin, International Ocean Discovery Program, Texas A&M University, Naturalis Biodiversity Center, University of Wollongong, Karl-Franzens-Universität Graz, University of Massachusetts, Amherst, Adelphi University, California Institute of Technology (Caltech), University of South Florida, Zhejiang University (ZJU), National Institute of Polar Research, University of Hong Kong, Akita University, University of Queensland, University of California, Davis, City University of New York, Lamont-Doherty Earth Observatory, University of Newcastle, University of California, Santa Cruz, Tohoku University, Nanjing University
- Journal
- Quaternary Science Reviews
- Band
- 200
- Seiten
- 114-122
- Anzahl der Seiten
- 9
- ISSN
- 0277-3791
- DOI
- https://doi.org/10.1016/j.quascirev.2018.09.028
- Publikationsdatum
- 11-2018
- Peer-reviewed
- Ja
- ÖFOS 2012
- 105121 Sedimentologie
- Schlagwörter
- ASJC Scopus Sachgebiete
- Geology, Ecology, Evolution, Behavior and Systematics, Archaeology, Archaeology, Global and Planetary Change
- Sustainable Development Goals
- SDG 14 – Leben unter Wasser, SDG 13 – Maßnahmen zum Klimaschutz
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/20d70c22-1d91-46f3-b67f-72294be64965