Neogene Mass Accumulation Rate of Carbonate Sediment Across Northern Zealandia, Tasman Sea, Southwest Pacific
Sutherland, R.; Dos Santos, Z.; Agnini, C.; Alegret, L.; Lam, A. R.; Westerhold, T.; Drake, M. K.; Harper, D. T.; Dallanave, E.; Newsam, C.; Cramwinckel, M. J.; Dickens, G. R.; Collot, J.; Etienne, S. J.G.; Bordenave, A.; Stratford, W. R.; Zhou, X.; Li, H.; Asatryan, G.
(2022) Paleoceanography and Paleoclimatology, volume 37, issue 2, pp. 1 - 22
(Article)
Abstract
Sediment mass accumulation rate (MAR) is a proxy for paleoceanographic conditions, especially if biological productivity generated most of the sediment. We determine MAR records from pelagic calcareous sediments in Tasman Sea based on analysis of 11 boreholes and >3 million seismic reflection horizon picks. Seismic data from regions of 10,000–30,000 km2
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around each borehole were analyzed using data from International Ocean Discovery Program Expedition 371 and other boreholes. Local MAR was affected by deepwater currents that winnowed, eroded, or deposited seafloor sediment. Therefore, it is necessary to average MARs across regions to test paleoceanographic and productivity models. MARs during the Miocene Climate optimum (18–14 Ma) were slightly lower than Quaternary values but increased on southern Lord Howe Rise at 14–13 Ma, when global climate became colder. Intensification of the Indian and East Asian monsoons at ∼8 Ma and ∼3.6 Ma approximately corresponds to the start and end, respectively, of the Biogenic Bloom, which had MARs at least double Quaternary values. On northern Lord Howe Rise, we recognize peak MARs at∼7 Ma and ∼5 Ma. There is no correlation between Neogene MAR and ocean pH or atmospheric CO2 concentration. Neogene MARs are on average higher than Quaternary values. We posit that future long-term productivity in the southwest Pacific could be higher than Quaternary values, but new computer models that can fit our observations are required to test this hypothesis.
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Keywords: biogenic, bloom, Miocene, Neogene, paleoceanography, Pliocene, Oceanography, Atmospheric Science, Palaeontology
ISSN: 2572-4517
Publisher: Wiley Online Library
Note: Funding Information: We thank International Ocean Discovery Program (IODP), especially crew and technical staff involved in Expedition 371; scientists involved in proposal writing or work onboard; the Associate Editor, Yige Zhang; reviewer Mitch Lyle; and two anonymous reviewers. Funding: NSF and many other national funding organizations that support IODP; ED is supported by DFG Project number 408178503; TW by DFG Project number 446583469; and LA by project PID2019-105537RB-I00 (Spanish Ministry of Science and Innovation and FEDER funds). Seisware software was used for seismic interpretation. GNS Science helped build the seismic reflection data set. Open access publishing facilitated by Victoria University of Wellington, as part of the Wiley - Victoria University of Wellington agreement via the Council of Australian University Librarians. Funding Information: We thank International Ocean Discovery Program (IODP), especially crew and technical staff involved in Expedition 371; scientists involved in proposal writing or work onboard; the Associate Editor, Yige Zhang; reviewer Mitch Lyle; and two anonymous reviewers. : NSF and many other national funding organizations that support IODP; ED is supported by DFG Project number 408178503; TW by DFG Project number 446583469; and LA by project PID2019‐105537RB‐I00 (Spanish Ministry of Science and Innovation and FEDER funds). Seisware software was used for seismic interpretation. GNS Science helped build the seismic reflection data set. Open access publishing facilitated by Victoria University of Wellington, as part of the Wiley ‐ Victoria University of Wellington agreement via the Council of Australian University Librarians. Funding Publisher Copyright: © 2022. The Authors.
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