10.1594/PANGAEA.761094
Kaminski, Michael Anthony
Michael Anthony
Kaminski
0000-0002-7344-5874
Baumgartner, Peter O
Peter O
Baumgartner
0000-0003-0632-659X
Bown, Paul R
Paul R
Bown
0000-0001-6777-4463
Haig, David W
David W
Haig
McMinn, Andrew
Andrew
McMinn
0000-0002-2133-3854
Moran, Michael J
Michael J
Moran
Mutterlose, Jörg
Jörg
Mutterlose
Ogg, James G
James G
Ogg
0000-0001-5716-3511
Magnetostratigraphic synthesis of ODP Leg 123 sites
PANGAEA
1992
Drilling/drill rig
Leg123
Joides Resolution
Ocean Drilling Program (ODP)
1988-09-08T02:30:00/1988-10-26T00:00:00
en
Supplementary Publication Series of Datasets
10.2973/odp.proc.sr.123.115.1992
3 datasets
application/zip
Creative Commons Attribution 3.0 Unported
During ODP Leg 123, Sites 765 and 766 were drilled to examine the tectonic evolution, sedimentary history, and paleoceanography of the Argo Abyssal Plain and lower Exmouth Plateau. At each site, the quality of magnetostratigraphic and biostratigraphic records varies because of complicating factors, such as the predominance of turbidites, the presence of condensed horizons, or deposition beneath the CCD.
Based primarily on the presence of nannofossils, the base of the sedimentary section at Site 765 was dated as Tithonian. A complete Cretaceous sequence was recovered at this site, although the sedimentation rate varies markedly through the section. The Cretaceous/Tertiary boundary is represented by a condensed horizon. The condensed Cenozoic sequence at Site 765 extends from the upper Paleocene to the lower Miocene. A dramatic increase in sedimentation rate was observed in the lower Miocene, and a 480-m-thick Neogene section is present. The Neogene section is continuous, except for a minor hiatus in the lower Pliocene.
The base of the sedimentary section at Site 766 is Valanginian, in agreement with the site's position on marine magnetic anomaly Mil. Valanginian to Barremian sediments are terrigenous, with variable preservation of microfossils, and younger sediments are pelagic, with abundant well-preserved microfossils. Sedimentation rate is highest in the Lower Cretaceous and decreases continually upsection. Upper Cenozoic sediments are condensed, with several hiatuses.
Supplement to: Kaminski, Michael Anthony; Baumgartner, Peter O; Bown, Paul R; Haig, David W; McMinn, Andrew; Moran, Michael J; Mutterlose, Jörg; Ogg, James G (1992): Magnetobiostratigraphic synthesis of Leg 123: Sites 765 and 766 (Argo Abyssal Plain and Lower Exmouth Plateau). In: Gradstein, FM; Ludden, JN; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 123, 717-737
110.4541
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South Indian Ridge, South Indian Ocean