Mid-Pliocene sea level and continental ice volume based on coupled benthic Mg/Ca palaeotemperatures and oxygen isotopes

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doi: 10.1098/rsta.2008.0222
Author(s): Dwyer, Gary S.; Chandler, Mark A.
Author Affiliation(s): Primary:
Duke University, Nicholas School of the Environment, Division of Earth and Ocean Sciences, Durham, NC, United States
Other:
U. S. Geological Survey, United States
University of Bristol, United Kingdom
Columbia University, United States
Volume Title: Pliocene; a vision of Earth in the late twenty-first century?
Volume Author(s): Haywood, Alan M., editor; Dowsett, Harry J.; Valdes, Paul J.
Source: The Pliocene; a vision of Earth in the late twenty-first century?, edited by Alan M. Haywood, Harry J. Dowsett and Paul J. Valdes. Philosophical Transactions - Royal Society. Mathematical, Physical and Engineering Sciences, 367(1886), p.157-168. Publisher: Royal Society of London, London, United Kingdom. ISSN: 1364-503X CODEN: PTRMAD
Note: In English. 35 refs.; illus.
Summary: Ostracode magnesium/calcium (Mg/Ca)-based bottom-water temperatures were combined with benthic foraminiferal oxygen isotopes in order to quantify the oxygen isotopic composition of seawater, and estimate continental ice volume and sea-level variability during the Mid-Pliocene warm period, ca 3.3-3.0 Ma. Results indicate that, following a low stand of approximately 65 m below present at marine isotope stage (MIS) M2 (ca 3.3 Ma), sea level generally fluctuated by 20-30m above and below a mean value similar to present-day sea level. In addition to the low-stand event at MIS M2, significant low stands occurred at MIS KM2 (-40 m), G22 (-40 m) and G16 (-60 m). Six high stands of +10 m or more above present day were also observed; four events (+10, +25,+15 and +30 m) from MIS M1 to KM3, a high stand of +15 m at MIS K1, and a high stand of +25 m at MIS G17. These results indicate that continental ice volume varied significantly during the Mid-Pliocene warm period and that at times there were considerable reductions of Antarctic ice.
Year of Publication: 2009
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Alkaline earth metals; Arthropoda; Atlantic Ocean; Calcium; Cenozoic; Chemostratigraphy; Climate change; Cores; Crustacea; DSDP Site 295; DSDP Site 296; DSDP Site 607; Deep Sea Drilling Project; Deglaciation; Foraminifera; Glacial geology; Global; IPOD; Ice sheets; Invertebrata; Isotope ratios; Isotopes; Kyushu-Palau Ridge; Leg 31; Leg 94; Magnesium; Mandibulata; Marine sediments; Metals; Mg/Ca; Microfossils; Mid-Atlantic Ridge; Middle Pliocene; Neogene; North Atlantic; North Pacific; Northeast Atlantic; Northwest Pacific; O-18/O-16; Ostracoda; Oxygen; Pacific Ocean; Paleo-oceanography; Paleoclimatology; Paleotemperature; Philippine Sea; Pliocene; Protista; Sea-level changes; Sediments; Stable isotopes; Tertiary; West Pacific; West Philippine Basin
Coordinates: N410004 N410005 W0325726 W0325727
N223346 N223346 E1312202 E1312202
N292025 N292025 E1333131 E1333131
Record ID: 2009072076
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by the Royal Society, London, United Kingdom