Channell, J. E. T. et al. (2003): Eocene to Miocene magnetostratigraphy, biostratigraphy, and chemostratigraphy at ODP Site 1090 (sub-Antarctic South Atlantic)
Leg/Site/Hole:
Related Expeditions:
ODP 177
Identifier:
ID:
2003-037551
Type:
georefid
ID:
10.1130/0016-7606(2003)115<0607:ETMMBA>2.0.CO;2
Type:
doi
Creator:
Name:
Channell, J. E. T.
Affiliation:
University of Florida, Department of Geological Sciences, Gainesville, FL, United States
Role:
author
Name:
Galeotti, S.
Affiliation:
Universita di Urbino, Italy
Role:
author
Name:
Martin, E. E.
Affiliation:
University of Delaware, United States
Role:
author
Name:
Billups, K.
Affiliation:
University of Colorado, United States
Role:
author
Name:
Scher, H. D.
Affiliation:
Role:
author
Name:
Stoner, J. S.
Affiliation:
Role:
author
Identification:
Title:
Eocene to Miocene magnetostratigraphy, biostratigraphy, and chemostratigraphy at ODP Site 1090 (sub-Antarctic South Atlantic)
Year:
2003
Source:
Geological Society of America Bulletin
Publisher:
Geological Society of America (GSA), Boulder, CO, United States
Volume:
115
Issue:
5
Pages:
607-623
Abstract:
At Ocean Drilling Program (ODP) Site 1090 (lat 42 degrees 54.8'S, long 8 degrees 54.0'E) located in a water depth of 3702 m on the Agulhas Ridge in the sub-Antarctic South Atlantic, approximately 300 m of middle Eocene to middle Miocene sediments were recovered with the advanced piston corer (APC) and the extended core barrel (XCB). U-channel samples from the 70-230 meters composite depth (mcd) interval provide a magnetic polarity stratigraphy that is extended to 380 mcd by shipboard whole-core and discrete sample data. The magnetostratigraphy can be interpreted by the fit of the polarity-zone pattern to the geomagnetic polarity time scale (GPTS) augmented by isotope data and bioevents with documented correlation to the GPTS. Three normal-polarity subchrons (C5Dr.1n, C7Ar.1n, and C13r.1n), not included in the standard GPTS, are recorded at Site 1090. The base of the sampled section is correlated to C19n (middle Eocene), although the interpretation is unclear beyond C17r. The top of the sampled section is correlated to C5Cn (late early Miocene), although, in the uppermost 10 m of the sampled section, a foraminifer (Globorotalia sphericomiozea) usually associated with the Messinian and early Pliocene has been identified. (super 87) Sr/ (super 86) Sr, delta (super 13) C, and delta (super 18) O values measured on foraminifera, including the delta (super 18) O and delta (super 13) C shifts close to the Eocene/Oligocene boundary, support the correlation to the GPTS. For the interval spanning the Oligocene/Miocene boundary, benthic delta (super 13) C, delta (super 18) O, and (super 87) Sr/ (super 86) Sr records from Site 1090 can be correlated to isotope records from ODP Site 929 (Ceara Rise), providing support for the recently-published Oligocene/Miocene boundary age (22.92 Ma) of Shackleton et al.
Language:
English
Genre:
Serial
Rights:
URL:
Coverage: Geographic coordinates: North:-42.5449 West:8.5359 East:
8.5359 South:-42.5449
Keywords: Stratigraphy; Agulhas Bank; algae; alkaline earth metals; Atlantic Ocean; biochemistry; biostratigraphy; C-13/C-12; carbon; Cenozoic; chemostratigraphy; cores; correlation; Eocene; Foraminifera; geochemistry; Globigerinacea; Globorotalia; Globorotalia sphericomiozea; Globorotaliidae; Indian Ocean; Invertebrata; isotope ratios; isotopes; Leg 177; magnetization; magnetostratigraphy; marine sediments; metals; microfossils; Miocene; nannofossils; natural remanent magnetization; Neogene; O-18/O-16; Ocean Drilling Program; ODP Site 1090; Oligocene; oxygen; Paleogene; paleomagnetism; Plantae; Protista; remanent magnetization; Rotaliina; sediments; South Atlantic; Sr-87/Sr-86; stable isotopes; stratigraphic boundary; strontium; Tertiary;
.