Pacific Equatorial Age Transect

Pälike, Heiko; Lyle, Mitchell W; Nishi, Hiroshi; Raffi, Isabella; Gamage, K.; Klaus, A.; Anderson, L.; Malinverno, A.; Backman, Jan; Beltran, Catherine; Busch, W.H.; Channell, J. E. T.; Dewangan, P.; Hasegawa, Hitoshi; Hathorne, Ed C; Hayashi, Hiroki; Holbourn, Ann; Hovan, Steven A; Iijima, Koichi; Ito, Takashi; Kimoto, Katsunori; Murphy, Daniel P.; Ogane, Kaoru; Romero, Oscar E; Schneider, Leah; Sluijs, Appy; Tian, Jie; Tsujimoto, Akira; Wade, Bridget S.; Wilkens, Roy H; Yamamoto, Shinya; Yamazaki, T.

doi:10.2204/iodp.proc.320321.101.2010

Cited by 61 publications

(54 citation statements)

References 91 publications

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“…A primary objective of the Integrated Ocean Drilling Program (IODP) Pacific Equatorial Age Transect (PEAT) project is to study the evolution of Earth systems in the equatorial Pacific from 50 to 0 Ma (see the "Expedition 320/321 summary" chapter [Pälike et al, 2010]). This objective requires the production of continuous sediment records sampled frequently enough to resolve the effects of orbital forcing.…”

Section: Introductionmentioning

confidence: 99%

Data report: calibration of XRF-estimated CaCO3 along the Site U1338 splice

Lyle¹,

Backman²

2013

Proceedings of the IODP

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We combined X-ray fluorescence (XRF) scan data from Integrated Ocean Drilling Program Expedition 321 Site U1338 and a set of 1060 discrete CaCO 3 measurements to calibrate a high-resolution XRF-estimated CaCO 3 profile for Site U1338. In this data report, we describe the method of calibration, using normalized medianscaled XRF data and discrete CaCO 3 measurements. A subset of ¾ of the discrete measurements was used to calibrate the XRF scan, and the quality of the calibration was checked with the remainder of the discrete data. Based upon the check data, the calibrated XRF CaCO 3 estimate is within ±5% of the independent discrete measurements (1 standard deviation). The calibrated XRF CaCO 3 estimate provides, for the first time, a carbonate profile for the middle Miocene-Holocene with a resolution of ~2 k.y. for the uppermost 60 compressed meters composite depth below seafloor and ≤1 k.y. resolution in the rest of the sediment section.

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Section: Introductionmentioning

confidence: 99%

Data report: calibration of XRF-estimated CaCO3 along the Site U1338 splice

Lyle¹,

Backman²

2013

Proceedings of the IODP

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“…Less good core conditions began to affect the splice and composite section toward the deep end of the sequence (see "Site U1338" in the "Expedition 320/321 summary" chapter [Pälike et al, 2010]), which presumably affected the positions of some of the deepest geomagnetic chron boundaries. For example, in Holes U1338B and U1338C ( (Table T3).…”

Section: Sedimentation Rate Lines Between 10 and 18 Mamentioning

confidence: 99%

“…F5 in the "Expedition 320/321 summary" chapter [Pälike et al, 2010]). Sedimentation rates thereafter increased to 34 m/My by ~13.2 Ma, when the site began to approach the Equator from the south.…”

Section: Sedimentation Rates Versus Agementioning

confidence: 99%

“…A key goal of Integrated Ocean Drilling Program (IODP) Expedition 320/321 (Pacific Equatorial Age Transect [PEAT]) was to recover a series of sediment sections from the Pacific paleoequator region preserving critical intervals of Cenozoic paleoceanographic and paleoclimatic conditions and development (see the "Expedition 320/321 summary" chapter [Pälike et al, 2010]). The age transect, or flow-line concept, of Pälike et al (2010) made use of Pacific plate motion and placed sites close to the Pacific paleoequator for carefully selected time intervals that would ensure near-continuous recovery of optimally preserved early Eocene through recent sediment sections.…”

Section: Introductionmentioning

confidence: 99%

“…The age transect, or flow-line concept, of Pälike et al (2010) made use of Pacific plate motion and placed sites close to the Pacific paleoequator for carefully selected time intervals that would ensure near-continuous recovery of optimally preserved early Eocene through recent sediment sections. Eight sites were drilled (Sites U1331-U1338) with present locations along an oblique northsouth transect from 12°4′N, 142°10′W (old end-member Site U1331; 5116 m water depth), to 2°30′N, 117°58′W (young end-member Site U1338; 4200 m water depth).…”

Section: Introductionmentioning

confidence: 99%

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Data report: a revised biomagnetostratigraphic age model for Site U1338, IODP Expedition 320/321

Backman¹,

Baldauf²,

Ciummelli³

et al. 2016

Proceedings of the IODP

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The development of late middle Miocene through recent sedimentation rates was determined for Integrated Ocean Drilling Program Site U1338 in the eastern equatorial Pacific using available geomagnetic chron boundaries and biostratigraphic biohorizons provided by calcareous nannofossils and diatoms. These data were set in a revised depth splice of the three holes at Site U1338 and provide a lower resolution image of the sedimentation rate history in the region of Site U1338 through relatively long linear interpolations between 11 chosen age-depth control points encompassing 18 My. The resulting sedimentation rates depict the movement of Site U1338 from just south of the Equator with modest sedimentation rates starting at 11 m/My to tripling of these rates near 13 Ma, when the site moved onto the Equator and into the equatorial high-productivity belt. High sedimentation rates continued into the earliest Pliocene (5 Ma) except for a 50% decrease during the so-called "carbonate crash" centered around 9.6 Ma ± 0.4 My. The site's movement north, away from the equatorial high-productivity belt, began between 5.0 and 4.2 Ma, when the site was located ~75-90 nmi north of the Equator, and resulted in a series of successively decreasing sedimentation rates to the present rate of 11 m/My, identical to the rate when sedimentation began at Site U1338 at nearly 18 Ma, when the site was located ~100 nmi south of the Equator.

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Equatorial Pacific productivity changes near the Eocene‐Oligocene boundary

et al. 2014

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There is general agreement that productivity in high latitudes increased in the late Eocene and remained high in the early Oligocene. Evidence for both increased and decreased productivity across the Eocene-Oligocene transition (EOT) in the tropics has been presented, usually based on only one paleoproductivity proxy and often in sites with incomplete recovery of the EOT itself. A complete record of the Eocene-Oligocene transition was obtained at three drill sites in the eastern equatorial Pacific Ocean (ODP Site 1218 and IODP Sites U1333 and U1334). Four paleoproductivity proxies that have been examined at these sites, together with carbon and oxygen isotope measurements on early Oligocene planktonic foraminifera, give evidence of ecologic and oceanographic change across this climatically important boundary. Export productivity dropped sharply in the basal Oligocene (~33.7 Ma) and only recovered several hundred thousand years later; however, overall paleoproductivity in the early Oligocene never reached the average levels found in the late Eocene and in more modern times. Changes in the isotopic gradients between deep-and shallow-living planktonic foraminifera suggest a gradual shoaling of the thermocline through the early Oligocene that, on average, affected accumulation rates of barite, benthic foraminifera, and opal, as well as diatom abundance near 33.5 Ma. An interval with abundant large diatoms beginning at 33.3 Ma suggests an intermediate thermocline depth, which was followed by further shoaling, a dominance of smaller diatoms, and an increase in average primary productivity as estimated from accumulation rates of benthic foraminifera.

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Pacific Equatorial Age Transect

Cited by 61 publications

References 91 publications

Data report: calibration of XRF-estimated CaCO3 along the Site U1338 splice

Data report: calibration of XRF-estimated CaCO3 along the Site U1338 splice

Data report: a revised biomagnetostratigraphic age model for Site U1338, IODP Expedition 320/321

Equatorial Pacific productivity changes near the Eocene‐Oligocene boundary

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