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Mid-Pleistocene extinction of bathyal benthic foraminifera in the Caribbean Sea

2006; Micropaleontology Press; Volume: 52; Issue: 3 Linguagem: Inglês

10.2113/gsmicropal.52.3.245

1937-2795

Bruce W. Hayward, Shungo Kawagata, Hugh R Grenfell, André W. Droxler, Michelle Shearer,

Isotope Analysis in Ecology

Research Article| January 01, 2006 Mid-Pleistocene extinction of bathyal benthic foraminifera in the Caribbean Sea Bruce W. Hayward; Bruce W. Hayward 1Geomarine Research, 49 Swainston Rd, St Johns, Auckland, New Zealand email: b.hayward@geomarine.org.nz, s.kawagata@geomarine.org.nz, h.grenfell@geomarine.org.nz Search for other works by this author on: GSW Google Scholar Shungo Kawagata; Shungo Kawagata 1Geomarine Research, 49 Swainston Rd, St Johns, Auckland, New Zealand email: b.hayward@geomarine.org.nz, s.kawagata@geomarine.org.nz, h.grenfell@geomarine.org.nz Search for other works by this author on: GSW Google Scholar Hugh R. Grenfell; Hugh R. Grenfell 1Geomarine Research, 49 Swainston Rd, St Johns, Auckland, New Zealand email: b.hayward@geomarine.org.nz, s.kawagata@geomarine.org.nz, h.grenfell@geomarine.org.nz Search for other works by this author on: GSW Google Scholar Andre W. Droxler; Andre W. Droxler 2Department of Earth Science, Rice University, P.O. Box 1892, Houston, TX 77251, USA email: andre@rice.edu Search for other works by this author on: GSW Google Scholar Michelle Shearer Michelle Shearer 2Department of Earth Science, Rice University, P.O. Box 1892, Houston, TX 77251, USA email: andre@rice.edu Search for other works by this author on: GSW Google Scholar Author and Article Information Bruce W. Hayward 1Geomarine Research, 49 Swainston Rd, St Johns, Auckland, New Zealand email: b.hayward@geomarine.org.nz, s.kawagata@geomarine.org.nz, h.grenfell@geomarine.org.nz Shungo Kawagata 1Geomarine Research, 49 Swainston Rd, St Johns, Auckland, New Zealand email: b.hayward@geomarine.org.nz, s.kawagata@geomarine.org.nz, h.grenfell@geomarine.org.nz Hugh R. Grenfell 1Geomarine Research, 49 Swainston Rd, St Johns, Auckland, New Zealand email: b.hayward@geomarine.org.nz, s.kawagata@geomarine.org.nz, h.grenfell@geomarine.org.nz Andre W. Droxler 2Department of Earth Science, Rice University, P.O. Box 1892, Houston, TX 77251, USA email: andre@rice.edu Michelle Shearer 2Department of Earth Science, Rice University, P.O. Box 1892, Houston, TX 77251, USA email: andre@rice.edu Publisher: Micropaleontology Press Received: 09 Oct 2005 Accepted: 17 Apr 2006 First Online: 09 Mar 2017 Online ISSN: 0026-2803 Print ISSN: 1937-2795 © 2006 The Micropaleontology Project, Inc. Micropaleontology (2006) 52 (3): 245–266. https://doi.org/10.2113/gsmicropal.52.3.245 Article history Received: 09 Oct 2005 Accepted: 17 Apr 2006 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Bruce W. Hayward, Shungo Kawagata, Hugh R. Grenfell, Andre W. Droxler, Michelle Shearer; Mid-Pleistocene extinction of bathyal benthic foraminifera in the Caribbean Sea. Micropaleontology 2006;; 52 (3): 245–266. doi: https://doi.org/10.2113/gsmicropal.52.3.245 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyMicropaleontology Search Advanced Search Abstract During the mid-Pleistocene Transition (MPT), 2 families, 14 genera and 41 species of benthic foraminifera (Extinction Group) declined in abundance (8–12 % of early Pleistocene benthic foraminiferal fauna) and finally disappeared at mid-bathyal depths in the Caribbean Sea (ODP Site 1000A, 916m depth), as part of the global extinction of at least 73 deep-water species at this time. At this site, the final phase of pulsed glacial decline, partial interglacial recoveries (0.8–0.67 Ma), and final extinction (0.58 Ma) was essentially the same as the youngest level so far documented elsewhere (0.57 Ma). Extinction Group specimens had smaller average sizes during periods of decline than during favorable periods with higher abundances. Census counts on different size fractions indicate that this extinction event is best recorded by studies of shells in the 150–300μm size range. Pteropod dissolution proxies indicate that intermediate waters in the Caribbean became less corrosive around the onset of the MPT (after c. 1.2 Ma). This is interpreted to be a result of increased input of northern hemisphere-sourced intermediate water at the expense of southern-sourced Antarctic Intermediate Water. Intervals of enhanced Extinction Group decline in intermediate waters in the Caribbean occurred during glacials around the start (1.15–1.05 Ma) and end (0.83–0.65 Ma) of the MPT. During these glacial periods preservation of carbonate was optimal and ä13C values high (in source waters at mid-depths in the North Atlantic), suggesting a causal link with enhanced inflow of a less-corrosive, colder, nutrient-depleted, well-ventilated water mass, such as Glacial North Atlantic Intermediate Water. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.