Sediment Cores from the East Pacific

Arrhenius, Gustaf

doi:10.1080/11035895309454862

Cited by 199 publications

(179 citation statements)

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“…Because aboard the ship we had observed close similarities among the GRAPE density records of sites even when widely separated, we have assumed throughout this exercise that changes in percentage carbonate (as reflected in the GRAPE density records) in reality did occur synchronously over wide areas of the Pacific Basin. Many previous studies have been based successfully on this hypothesis (Arrhenius, 1952;Hays et al, 1969;Vincent, 1981;Farrell and Prell, 1991). Mayer (1991) showed how one may calculate a record of percentage carbonate from a GRAPE density record, and Hagelberg et al (this volume) show carbonate records derived by this method for the Leg 138 sites.…”

Section: Tuning Methodsmentioning

confidence: 99%

A New Late Neogene Time Scale: Application to Leg 138 Sites

Shackleton¹,

Crowhurst²,

Hagelberg³

et al. 1995

Proceedings of the Ocean Drilling Program

225

240

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The sediments recovered during Leg 138 provide a remarkable opportunity to improve the geological time scale of the late Neogene. We have developed new time scales in the following steps. First, we constructed age models on the basis of shipboard magnetostratigraphy and biostratigraphy, using the time scale of Berggren, Kent, and Flynn (1985). Second, we refined these age models using shipboard GRAPE density measurements to provide more accurate correlation points. Third, we calibrated a time scale for the past 6 m.y. by matching the high-frequency GRAPE density variations to the orbital insolation record of Berger and Loutre (1991); we also took into account δ 18 θ records, where they were available. Fourth, we generated a new seafloor anomaly time scale using our astronomical calibration of C3A.n (t) at 5.875 Ma and an age of 9.639 Ma for C5n.ln (t) that is based on a new radiometric calibration (Baksi, 1992). Fifth, we recalibrated the records older than 6 Ma to this new scale. Finally, we reconsidered the 6-to 10-Ma interval and found that this could also be partially tuned astronomically.

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Section: Tuning Methodsmentioning

confidence: 99%

A New Late Neogene Time Scale: Application to Leg 138 Sites

Shackleton¹,

Crowhurst²,

Hagelberg³

et al. 1995

Proceedings of the Ocean Drilling Program

225

240

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show abstract

“…Indeed, even before the introduction of stable isotope stratigraphy, changes in sediment composition were used to imply glacial to interglacial changes in productivity [see, e.g., Arrhenius, 1952Arrhenius, , 1954Wiseman, 1954]. However, the conclusions of these early studies were often subsequently challenged because the interpretations of such measurements required the assumption that some component of the sediment accumulates at a constant rate.…”

Section: Introductionmentioning

confidence: 98%

CaCO₃ size distribution: A paleocarbonate ion proxy?

Broecker¹,

Clark²

1999

Paleoceanography

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Abstract. Lysocline reconstructions play an important role in scenarios purporting to explain the lowered atmospheric CO2 content of glacial time. These reconstructions are based on indicators such as the CaCO3 content, the percent of coarse fraction, the ratio of fragments to whole foraminifera shells, the ratio of solution-susceptible to solution-resistant species, and the ratio of coarse to fine CaCO3. All assume that changes with time in the composition of the input material do not bias the result. However, as the composition of the input material does depend on climate, none of these indicators provides an absolute measure of the extent of dissolution. In this paper we evaluate the reliability of the ratio of >63 gm CaCO3 to total CaCO3 as a dissolution indicator. We present here results that suggest that in today's tropics this ratio appears to be determined solely by CO• ion concentration and water depth (i.e., the saturation state of bottom waters). This f'mding offers the possibility that the size fraction index can be used to reconstruct CO• ion concentrations for the late Quaternary ocean to an accuracy of +5 gmol kg -•.

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“…Thus, a general increase in production also increases the overall dissolution rate. On a regional scale, high production results in increased carbonate deposition and a deepening of the CCD, as observed along the equator (Arrhenius, 1952;Berger and Winterer, 1974;van Andel et al, 1975). Therefore, increased production along the equator results in the increased accumulation of carbonate.…”

Section: Paleoceanographic Backgroundmentioning

confidence: 99%

Introduction

1991

Proceedings of the Ocean Drilling Program

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Sediment Cores from the East Pacific

Cited by 199 publications

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A New Late Neogene Time Scale: Application to Leg 138 Sites

A New Late Neogene Time Scale: Application to Leg 138 Sites

CaCO₃ size distribution: A paleocarbonate ion proxy?

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Sediment Cores from the East Pacific

Cited by 199 publications

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A New Late Neogene Time Scale: Application to Leg 138 Sites

A New Late Neogene Time Scale: Application to Leg 138 Sites

CaCO3 size distribution: A paleocarbonate ion proxy?

Introduction

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CaCO₃ size distribution: A paleocarbonate ion proxy?