Miocene benthic foraminiferal isotope records; a synthesis

Author(s): Savin, Samuel M.; Douglas, Robert G.; Keller, Gerta; Killingley, John S.; Shaughnessy, Linda; Sommer, Michael A.; Vincent, Edith; Woodruff, Fay
Author Affiliation(s): Primary:
Case Western Reserve University, Department of Geological Sciences, Cleveland, OH, United States
University of Southern California, United States
U. S. Geological Survey, United States
Scripps Institution of Oceanography, United States
Florida State University, United States
Volume Title: Cenozoic paleoceanography
Volume Author(s): Kennett, J. P., prefacer
Source: Cenozoic paleoceanography, prefaced by J. P. Kennett. Marine Micropaleontology, 6(5-6), p.423-450. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0377-8398 CODEN: MAMIDH
Note: In English. Includes appendix; NSF grants OCE 79-17017, OCE 79-19090, OCE 76-82656, OCE 79-19093, and OCE 79-18285. 31 refs.; illus., incl. 3 tables, sketch map
Summary: O13/O16 and C13/C12 ratios of Miocene benthic foraminifera from a number of Atlantic, Pacific and Indian Ocean DSDP sites (71, 77B, 206, 208, 238, 279, 289, 296, 329, 357 and 366A) have been compiled. These provide a rather detailed history of Miocene deep water especially in the Pacific Ocean. Bottom-water temperatures rose during the early Miocene and then declined rapidly during the middle Miocene. This decline was accompanied by an increase in Antarctic glaciation. Late Miocene bottom temperatures and Antarctic ice volumes are inferred to be similar to today's, but exhibited some fluctuation. The early Miocene ocean was less thermally stratified at intermediate and abyssal depths while the late Miocene deep ocean had a thermal structure generally similar to the modern ocean. Foraminiferal carbon isotope ratios at most of the sites varied quasi-sympathetically throughout the Miocene. These variations must reflect comparable variations in the mean C13/C12 of marine HCO3. However, the causes of such variations are not yet clear. (Auth.)
Year of Publication: 1981
Research Program: DSDP Deep Sea Drilling Project
Key Words: 02 Geochemistry; 12 Stratigraphy, Historical Geology and Paleoecology; Antarctica; Atlantic Ocean; Benthic taxa; C-13/C-12; Carbon; Cenozoic; Chemostratigraphy; DSDP Site 206; DSDP Site 208; DSDP Site 238; DSDP Site 279; DSDP Site 289; DSDP Site 296; DSDP Site 329; DSDP Site 357; DSDP Site 366; DSDP Site 71; DSDP Site 77; Deep Sea Drilling Project; East Pacific; Equatorial Atlantic; Equatorial Pacific; Falkland Plateau; Foraminifera; Glacial environment; Ice; Indian Ocean; Invertebrata; Isotope ratios; Isotopes; Kyushu-Palau Ridge; Leg 21; Leg 24; Leg 29; Leg 30; Leg 31; Leg 36; Leg 39; Leg 41; Leg 8; Leg 9; Lord Howe Rise; Macquarie Ridge; Microfossils; Miocene; Neogene; New Caledonia Basin; North Atlantic; North Pacific; Northeast Pacific; Northwest Pacific; O-18/O-16; Ontong Java Plateau; Oxygen; Pacific Ocean; Paleoclimatology; Paleotemperature; Philippine Sea; Protista; Rio Grande Rise; Sea ice; Sierra Leone Rise; South Atlantic; South Pacific; Southwest Pacific; Stable isotopes; Tertiary; Volume; West Pacific
Coordinates: S300000 S260600 E1652700 E1611300
N002800 N042800 W1331300 W1401800
S300015 S300015 W0353335 W0353335
S110913 S110912 E0703134 E0703133
Record ID: 2009022795
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from the Antarctic Bibliography, United States