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Magnetobiostratigraphic synthesis of Leg 123: sites 765 and 766 (Argo Abyssal Plain and Lower Exmouth Plateau)

Kaminski, M.A.; Baumgartner, P.O.; Bown, P.R.; Haig, D.W.; McMinn, A.; Moran, M.J.; Mutterlose, J.; (1992) Magnetobiostratigraphic synthesis of Leg 123: sites 765 and 766 (Argo Abyssal Plain and Lower Exmouth Plateau). Proceedings of the Ocean Drilling Program: Scientific Results , 123 pp. 717-737. 10.2973/odp.proc.sr.123.115.1992. Green open access

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Abstract

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.

Type: Article
Title: Magnetobiostratigraphic synthesis of Leg 123: sites 765 and 766 (Argo Abyssal Plain and Lower Exmouth Plateau)
Open access status: An open access version is available from UCL Discovery
DOI: 10.2973/odp.proc.sr.123.115.1992
Publisher version: http://dx.doi.org/10.2973/odp.proc.sr.123.1992
Language: English
Additional information: Issue entitled: Argo Abyssal Plain/ Exmouth Plateau covering Leg 123 of the cruises of the Drilling Vessel JOIDES Resolution, Singapore, Republic of Singapore, to Singapore, Republic of Singapore, Sites 765-766, 28 August 1988 - 1 November 1988
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/18316
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