Site Survey

Mayer, L.A.; Pisias, N.G.; Mix, A.C.; Lyle, M.W.; Arason, P.; Mosher, D

doi:10.2973/odp.proc.ir.138.107.1992

Cited by 33 publications

(91 citation statements)

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“…In today's oceans, the EEP upwelling system supports more than 10 % of the global biological production (Pennington et al, 2006). The relatively high primary productivity results in exceptionally high sedimentation rates that amount to up to 3.0 cm kyr -1 during the past 5 Myr (Mayer et al, 1992;Mix et al, 1995). 10…”

Section: The Eastern Equatorial Pacificmentioning

confidence: 99%

See 1 more Smart Citation

Thermocline state change in the Eastern Equatorial Pacific during the late Pliocene/early Pleistocene intensification of Northern Hemisphere Glaciation

Jakob¹,

Pross²,

Scholz³

et al. 2017

Preprint

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Section: The Eastern Equatorial Pacificmentioning

confidence: 99%

“…To reconstruct changes in thermocline depth in the EEP we focused on sediments from ODP Leg 138 Site 849 (coordinates: 0°11′N, 110°31′W; present-day water depth: 3851 m [Mayer et al, 1992]) (Fig. 1).…”

Section: Odp Site 849mentioning

confidence: 99%

Thermocline state change in the Eastern Equatorial Pacific during the late Pliocene/early Pleistocene intensification of Northern Hemisphere Glaciation

Jakob¹,

Pross²,

Scholz³

et al. 2017

Preprint

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“…Bulk sediment concentration data for the IODP Leg 320/321 sites U1332--U1338 and ODP sites 1217--1220 were originally derived at sea with an inductively coupled plasma atomic emission spectrometer (ICP--AES) (Expedition 320/321 Scientists, 2010;Quintin et al, 2002). Those data from ODP Sites 848 and 850 were derived by X--ray fluorescence spectroscopy and loss--on--ignition (Mayer et al 1992). The data from Sites U1332--U1338 and 1217--1220 were multiplied by the bulk mass accumulation rates from Pälike et al (2012) for the same core intervals analyzed geochemically.…”

Section: )mentioning

confidence: 99%

“…Sites 849 and 851 were multiplied by the associated core dry bulk densities (Mayer et al 1992) and sedimentation rates of Shackleton et al (1995). The Gaussian function (Mitchell, 1998a) to the data 1˚ averages.…”

Section: )mentioning

confidence: 99%

Evaluating Cenozoic equatorial sediment deposition anomalies for potential paleoceanographic and Pacific plate motion applications

Mitchell

Dubois

2013

Mar Geophys Res

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If equatorial sediments form characteristic deposits around the equator, they may help to resolve the amount of northwards drift of the Pacific tectonic plate.Relevant to this issue, it has been shown that 230 Th has been accumulating on the equatorial seabed faster than its production from radioactive decay in the overlying water column during the Holocene (Marcantonio et al., 2001). Some researchers have argued that this reflects the deposition of particles with adsorbed 230 Th carried by bottom currents towards the equator ("focusing"). If correct, this effect may combine with high pelagic productivity, which is also centered on the equator, to yield a characteristic signature of high accumulation rates marking the paleoequator in older deposits.Here we evaluate potential evidence that such an equatorial feature existed in the geological past. Seismic reflection data from seven meridional transects suggest that a band of equatorially enhanced accumulation of

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“…GRAPE measurements could also reflect terrigenous influence if the terrigenous materials have different porosity or density than biogenic sediments. For example, most sites drilled on Leg 138 showed a strong positive correlation between GRAPE and percent carbonate (Mayer, Pisias, Janecek, et al, 1992). All four parameters used were measured at 5-to 15-cm intervals throughout almost all the recovered cores.…”

Section: Regression Analysismentioning

confidence: 99%

Terrigenous sedimentation at Ceara Rise

Dobson¹,

Dickens²,

Rea³

1997

Proceedings of the Ocean Drilling Program

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A series of 47 samples was taken at Ceara Rise from Sites 925 and 929 during Ocean Drilling Program Leg 154. The samples spanned the entire cored section from the late Paleocene to the present. A series of chemical extractions was performed on these samples to isolate the terrigenous component. The magnitude of the terrigenous component was calculated both as weight percent and as a mass accumulation rate, which is not affected by fluctuations in nonterrigenous deposition. The mass accumulation rate of terrigenous materials at Ceara Rise has varied widely over the period studied, culminating in a ten-fold increase since 8 Ma. This was probably caused by Andean uplift and increased Amazon river flow. Thirty of the extracted samples were then analyzed for elemental compositions by instrumental neutron activation analysis. The results divide the terrigenous materials into three chemically distinct groups. These chemical distinctions also split the samples by age, implying that the source of terrigenous materials for Ceara Rise has changed through time. Interestingly, the three chemical groupings are not on the same mixing line and must then represent at least three independent terrigenous signals. The timing of the shifts between groups is consistent with South American tectonic history. Finally, the terrigenous fraction (by weight percent) of the extracted samples was regressed against high-resolution shipboard measurements. This allows estimation of weight percent terrigenous materials at any depth or age from pre-existing natural gamma, magnetic susceptibility, and color reflectance. Only samples from the last 12 Ma produced useful estimates.

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Site Survey

Cited by 33 publications

References 0 publications

Thermocline state change in the Eastern Equatorial Pacific during the late Pliocene/early Pleistocene intensification of Northern Hemisphere Glaciation

Thermocline state change in the Eastern Equatorial Pacific during the late Pliocene/early Pleistocene intensification of Northern Hemisphere Glaciation

Evaluating Cenozoic equatorial sediment deposition anomalies for potential paleoceanographic and Pacific plate motion applications

Terrigenous sedimentation at Ceara Rise

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