ORCID Profile
0000-0003-3725-6213
Current Organisations
Kumamoto University
,
King Fahd University of Petroleum and Minerals
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Publisher: Elsevier BV
Date: 10-2021
Publisher: Copernicus GmbH
Date: 04-03-2021
DOI: 10.5194/EGUSPHERE-EGU21-7844
Abstract: & & Site U1512 was drilled during Expedition 369 of the International Ocean Discovery Program (IODP), which is located in the Great Australian Bight, southern Indian Ocean. It provides exceptional insights into the benthic foraminiferal biostratigraphy and paleoecology of a high southern latitude restricted marginal marine basin during the Late Cretaceous hot greenhouse climate and the rifting between Australia and Antarctica. The sedimentary sequence recovered at Site U1512 presents a rare record of a deep water agglutinated foraminifera (DWAF) community from the Southern High Latitudes. The Cretaceous record at Site U1512 covers the lower Turonian through Santonian (nannofossil zones UC8b to UC12/CC10b to CC16, & em& H. helvetica& /em& to & em& Marginotruncana& /em& spp. - & em& Planoheterohelix papula& /em& - & em& Globotruncana linneana& /em& planktonic foraminifera zones). Diverse benthic foraminiferal assemblages yield many new taxa that are yet to be described.& & & & Agglutinated forms dominate the assemblage in most intervals. In lower to mid Turonian and Santonian strata, calcareous benthic as well as planktonic foraminifera are frequent. Abundant radiolaria are recovered from the mid Turonian, and they increase up-section and exceed 50% of the microfossil assemblage. We documented a erse benthic foraminiferal assemblage consisting of 162 taxa (110 agglutinated and 52 calcareous). The most common taxa of the DWAF assemblage are tubular (i.e., & em& Kalamopsis grzybowskii,& /em& & em& Bathysiphon& /em& spp.) and planispiral forms (i.e., & em& Ammodiscus& /em& spp., & em& Haplophragmoides& /em& spp., & em& Buzasina& /em& sp., & em& Labrospira& /em& spp.).& & & & The Turonian strata yield highly abundant & em& Bulbobaculites problematicus& /em& and & em& Spiroplectammina navarroana& /em& . The presence of the agglutinated foraminiferal marker taxa & em& Uvigerinammina jankoi& /em& and & em& Bulbobaculites problematicus& /em& provides a tie-point to the Tethyan DWAF biozonation of Geroch and Nowak (1984). The composition of foraminiferal assemblages and the increase in radiolaria abundance suggest unstable environmental conditions at Site U1512 during the early Turonian through Santonian. These characteristics refer to changes in bathymetry associated with changing ocean chemistry. Results of quantitative analyses of the benthic foraminiferal assemblages indicate a restricted paleoenvironmental regime, dictated by changes in paleobathymetry, unstable patterns in ocean circulation, and the discharge of a nearby river delta system.& & & & References: Geroch, S., Nowak, K., 1984. Proposal of zonation for the Late Tithonian & #8211 late Eocene. based upon arenaceous Foraminifera from the Outer Carpathians, Poland, 225-239, In: Oertli, H.J. (Ed.), Benthos & #180 2nd international 915 Symposium on Benthic Foraminifera, Pau (France) April 11-15, 1983, Elf Aquitaine, ESO REP and TOTAL CFP, Pau and Bordeaux.& & & & & & &
Publisher: Elsevier BV
Date: 08-2018
Location: United Kingdom of Great Britain and Northern Ireland
Location: Saudi Arabia
Location: United States of America
No related grants have been discovered for Hisashi Kanemaru.