| Title | A view of Antarctic ice-sheet evolution from sea-level and deep-sea isotope changes during the Late Cretaceous-Cenozoic |
| Author | Miller, K.G.; Wright, J.D.; Katz, M.E.; Browning, J.V.; Cramer, B.S.; Wade, B.S.; Mizintseva, S.F. |
| Author Affil | Miller, K.G., Rutgers University, Department of Earth and Planetary Sciences, Piscataway, NJ. Other: Jet Propulsion Laboratory; University of Oregon; Texas A&M University |
| Source | Antarctica; a keystone in a changing world; online proceedings for the 10th international symposium on Antarctic earth sciences. Open-File Report - U. S. Geological Survey, No.OF2007-1047, p.55-70; [10th international symposium on Antarctic earth sciences; Antarctica; a keystone in a changing world, Santa Barbara, CA, Aug. 26- Sept. 1, 2007]; edited by A. Cooper and C. Raymond. Publisher: U. S. Geological Survey, Reston, VA, United States. ISSN: 0196- 1497 |
| Publication Date | 2007 |
| Notes | In English. Accessed on May 27, 2010. 109 refs. GeoRef Acc. No: 299609. CRREL Acc. No: 64004511 |
| Index Terms | climatic change; correlation; glacial geology; ice sheets; isotopes; ocean environments; oxygen; paleoclimatology; Antarctica--Antarctic ice sheet; Pacific Ocean--Equatorial Pacific; Indian Ocean-- Kerguelen Plateau; Ocean Drilling Program-- Leg 119; Ocean Drilling Program--Leg 120; Pacific Ocean--Northeast Pacific; Ocean Drilling Program--ODP Site 1218; Southern Ocean; Antarctic ice sheet; Antarctica; Cenozoic; climate change; Cretaceous; deep- sea environment; East Pacific; Eocene; Equatorial Pacific; Foraminifera; Indian Ocean; Invertebrata; isotope ratios; Kerguelen Plateau; Leg 119; Leg 120; Leg 199; marine environment; Mesozoic; microfossils; Miocene; Neogene; North Pacific; Northeast Pacific; O-18/O-16; Ocean Drilling Program; ODP Site 1218; Oligocene; Pacific Ocean; paleo-oceanography; Paleogene; Protista; reconstruction; sea-level changes; stable isotopes; Tertiary; USGS |
| Abstract | The imperfect direct record of Antarctic glaciation has led to the delayed recognition of the initiation of a continent- sized ice sheet. Early studies interpreted initiation in the middle Miocene (ca 15 Ma). Most current studies place the first ice sheet in the earliest Oligocene (33.55 Ma), but there is physical evidence for glaciation in the Eocene. Though there are inherent limitations in sea-level and deep-sea isotope records, both place constraints on the size and extent of Late Cretaceous to Cenozoic Antarctic ice sheets. Sea-level records argue that small- to medium-size (typically 10- 12×106 km3) ephemeral ice sheets occurred during the greenhouse world of the Late Cretaceous to middle Eocene. Deep-sea delta 18O records show increases associated with many of these greenhouse sea-level falls, consistent with their attribution to ice- sheet growth. Global cooling began in the middle Eocene and culminated with the major earliest Oligocene (33.55 Ma) growth of a large (25×106 km3) Antarctic ice sheet that caused a 55-70 m eustatic fall and a 1% delta 18O increase. This large ice sheet became a driver of climate change, not just a response to it, causing increased latitudinal thermal gradients and a spinning up of the oceans that, in turn, caused a dramatic reorganization of ocean circulation and chemistry. |
| URL | http://pubs.usgs.gov/of/2007/1047/ |
| Publication Type | conference paper or compendium article |
| Record ID | 88364 |