The University of Southampton
University of Southampton Institutional Repository

IODP Proposal 626: "Cenozoic Equatorial Age Transect – Following the Palaeo-equator"

Pälike, H., Lyle, M.W., Moore, T.C., Mitchell, N.C., Backman, J., Rea, D.K. and Tauxe, L. (2004) IODP Proposal 626: "Cenozoic Equatorial Age Transect – Following the Palaeo-equator" , Southampton, UK University of Southampton 48pp.

Record type: Monograph (Project Report)


As the largest ocean, the Pacific is intricately linked to major changes in the global climate system that took place during the Cenozoic. Throughout the Cenozoic the Pacific plate has had a northward component. Thus, the Pacific is unique, in that the thick sediment bulge of biogenic rich deposits from the currently narrowly focused zone of equatorial upwelling is slowly moving away from the equator. Hence, older sections are not deeply buried and can be recovered by drilling. Previous ODP Legs 138 and 199 were designed as transects across the paleo-equator in order to study the changing patterns of sediment deposition across equatorial regions, while this proposal aims to recover an orthogonal “age-transect” along the paleo-equator. Both previous legs were remarkably successful in giving us new insights into the workings of the climate and carbon system, productivity changes across the zone of divergence, time dependent calcium carbonate dissolution, bio- and magnetostratigraphy, the location of the ITCZ, and evolutionary patterns for times of climatic change and upheaval. Together with older DSDP drilling in the eastern equatorial Pacific, both Legs also helped to delineate the position of the paleo-equator and variations in sediment thickness from approximately 150°W to 110°W. As we have gained more information about the past movement of plates, and where in time “critical” climate events are located, we now propose to drill an age-transect (“flow-line”) along the position of the paleo-equator in the Pacific, targeting selected time-slices of interest where calcareous sediments have been preserved best. Leg 199 enhanced our understanding of extreme changes of the calcium carbonate compensation depth across major geological boundaries during the last 55 million years. A very shallow CCD during most of the Paleogene makes it difficult to obtain well preserved sediments, but we believe our siting strategy will allow us to drill the most promising sites and to obtain a unique sedimentary biogenic carbonate 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 Miocene, contributing to the objectives of the IODP Extreme Climates Initiative, and providing material that the previous legs were not able to recover.

PDF IODP626Full_revised_small_nocvs.pdf - Other
Download (7MB)

More information

Submitted date: 2004
Additional Information: This document contains the original IODP Drilling Proposal 626Full2, and was submitted to the IODP in revised form in 2004.


Local EPrints ID: 46418
PURE UUID: eded9e12-9957-4a1e-b384-3647b2e3d84b

Catalogue record

Date deposited: 27 Jun 2007
Last modified: 17 Jul 2017 15:07

Export record


Author: H. Pälike
Author: M.W. Lyle
Author: T.C. Moore
Author: N.C. Mitchell
Author: J. Backman
Author: D.K. Rea
Author: L. Tauxe

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton:

ePrints Soton supports OAI 2.0 with a base URL of

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.