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The PACIFIC EQUATORIAL AGE TRANSECT (“PEAT”): New insights into the  Cenozoic link between climate and calcium carbonate compensation
University of Southampton.
Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
2009 (English)In: Eos, Trans. American Geophysysical Union, 90(52)(Suppl.):PP43C-06, 2009Conference paper, Abstract (Other academic)
Abstract [en]

Integrated Ocean Drilling Program (IODP) Expeditions 320 and 321,

“Pacific Equatorial Age Transect” (Sites U1331-U1338), were designed

to recover a continuous Cenozoic record of the palaeoequatorial

Pacific by coring above the palaeoposition of the equator at

successive crustal ages on the Pacific plate. These sediments record

the evolution of the palaeoequatorial climate system throughout the

Cenozoic. As we have gained more information about the past movement

of plates, and when in Earth’s history “critical” climate events took

place, it became possible to drill an age-transect (“flow-line”) along

the position of the paleoequator in the Pacific, targeting important

time slices where the sedimentary archive allows us the reconstruction

of past climatic and tectonic conditions. The Pacific Equatorial Age

Transect (PEAT) cored eight sites from the sediment surface to

basement, with basalt aged between 53 to 18 Ma, covering the time

period following maximum Cenozoic warmth, through initial major

glaciations, to today. The PEAT program allows the reconstruction of

extreme changes of the calcium carbonate compensation depth across

major geological boundaries during the last 53 m.y. A very shallow CCD

during most of the Paleogene makes it difficult to obtain well

preserved carbonate sediments during these stratigraphic intervals,

but we recovered a unique sedimentary biogenic sediment archive for

time periods just after the Paleocene-Eocene boundary event, the

Eocene cooling, the Eocene/Oligocene transition, the “one cold pole”

Oligocene, the Oligocene-Miocene transition, and the middle Miocene

cooling. Together with older ODP and DSDP drilling in the equatorial

Pacific, we can also delineate the position of the palaeoequator and

variations in sediment thickness from approximately 150°W to 110°W

longitude. We will present a preliminary reconstruction of the Pacific

carbonate compensation depth (CCD) throughout the time interval


Place, publisher, year, edition, pages
, Eos, Trans. Am. Geophys. Union, 90(52)(Suppl.):PP43C-06, Abstract GP43C-06
URN: urn:nbn:se:su:diva-34411OAI: diva2:284673
AGU Fall Meeting 2009
Available from: 2010-01-08 Created: 2010-01-08 Last updated: 2012-12-10

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