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
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