Planktonic foraminiferal oxygen isotope analysis by ion microprobe technique suggests warm tropical sea surface temperatures during the Early Paleogene

Kozdon, Reinhard; Kelly, D. Clay; Kita, N. T.; Fournelle, John; Valley, John W.

doi:10.1029/2010pa002056

Cited by 81 publications

(118 citation statements)

References 101 publications

(157 reference statements)

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“…Additionally, Paleogene equatorial surface water temperatures are thought to have been warmer than modern waters (up to ~35-40 °C; Pearson et al, 2001;Bijl et al, 2009;Kozdon et al, 2011). Thus,  47 -based temperatures below 24°C are unlikely to represent original carbonate formation temperatures and instead likely indicate the occurrence of dissolution-reprecipitation reactions.…”

Section: Site 807  47 Values and  47 -Based Temperaturesmentioning

confidence: 99%

“…18 O values yield surface-water temperatures that are ~10°C lower than the original formation temperature of the samples (Schrag et al, 1995;Pearson et al, 2001;Kozdon et al, 2011), though see Bernard et al (2017) for a recent, alternative view on the effects of diagenesis on  18 O carb values in deep-sea sediments.…”

Section: Background For Deep-sea Sedimentsmentioning

confidence: 99%

“…It is generally thought that past equatorial temperatures were equal to or warmer on average than they are today, aside from glacial/interglacial variations (Pearson et al, 2001;Wara et al, 2005;Bijl et al, 2009;Kozdon et al, 2011;Zhang et al, 2014). This provides a first-order constraint on potential past surface seawater temperatures.…”

Section: O Carb Values At Site 807: the Importance Of Sea-surface Temmentioning

confidence: 99%

“…( (Pearson et al, 2001;de Garidel-Thoron et al, 2005;Bijl et al, 2009;Kozdon et al, 2011;Zhang et al, 2014) Lines for oxygen isotopic equilibrium between calcite and water for waters ranging from -1 to +1‰ (i.e., the ~range expected over the Cenozoic; Shackleton and Kennett, 1975;Miller et al, 1987;Adkins et al, 2002) are also given along with the best-fit line through the data. We note that points with  47 values below 0.705‰ typically plot below the trend line.…”

Section: Figuresmentioning

confidence: 99%

“…For example, Eocene surface tropical temperatures are estimated to have been at least 32-33°C based on  18 O carb values of well preserved foraminifera (Pearson et al, 2001;Kozdon et al, 2011). Organic proxies based on archaeal lipid structures have indicated that equatorial surface water temperatures ranged from 35-40°C in the Eocene (Bijl et al, 2009).…”

Section: Following Previous Work On mentioning

confidence: 99%

See 4 more Smart Citations

Modeling the effects of diagenesis on carbonate clumped-isotope values in deep- and shallow-water settings

Stolper

Eiler

Higgins

2018

Geochimica et Cosmochimica Acta

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. O values provides new constraints on both the diagenetic history of deep-sea settings as well as past equatorial sea-surface temperatures. Specifically, the combination of the diagenetic model and data support previous work that indicates equatorial sea-surface temperatures were warmer in the Paleogene as compared to today. We then explore whether the model is applicable to shallow-water settings commonly preserved in the rock record. Using a previously published dataset from the Bahamas, we demonstrate that the model captures the main trends of the data as a function of burial depth and thus appears applicable to a range of depositional settings.

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Section: Site 807  47 Values and  47 -Based Temperaturesmentioning

confidence: 99%

Section: Background For Deep-sea Sedimentsmentioning

confidence: 99%

Section: O Carb Values At Site 807: the Importance Of Sea-surface Temmentioning

confidence: 99%

Section: Figuresmentioning

confidence: 99%

Section: Following Previous Work On mentioning

confidence: 99%

See 3 more Smart Citations

Modeling the effects of diagenesis on carbonate clumped-isotope values in deep- and shallow-water settings

Stolper

Eiler

Higgins

2018

Geochimica et Cosmochimica Acta

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Rapid and sustained surface ocean acidification during the Paleocene‐Eocene Thermal Maximum

et al. 2014

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The Paleocene-Eocene Thermal Maximum (PETM) has been associated with the release of several thousands of petagrams of carbon (Pg C) as methane and/or carbon dioxide into the ocean-atmosphere system within~10 kyr, on the basis of the co-occurrence of a carbon isotope excursion (CIE), widespread dissolution of deep sea carbonates, and global warming. In theory, this rapid carbon release should have severely acidified the surface ocean, though no geochemical evidence has yet been presented. Using boron-based proxies for surface ocean carbonate chemistry, we present the first observational evidence for a drop in the pH of surface and thermocline seawater during the PETM.

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The middle Eocene climatic optimum (MECO): A multiproxy record of paleoceanographic changes in the southeast Atlantic (ODP Site 1263, Walvis Ridge)

et al. 2014

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The middle Eocene climatic optimum (MECO,~40 Ma) was a transient period of global warming that interrupted the secular Cenozoic cooling trend. We investigated the paleoceanographic, paleoenvironmental, and paleoecological repercussions of the MECO in the southeast Atlantic subtropical gyre (Ocean Drilling Program Site 1263). TEX 86 and δ 18 O records support an~4°C increase in surface and deepwater temperatures during the MECO. There is no long-term negative carbon isotope excursion (CIE) associated with the early warming, consistent with other sites, and there is no short-term negative CIE (~50 kyr) during the peak of the MECO, in contrast to what has been observed at some sites. This lack of a CIE during the peak of the MECO at Site 1263 could be due to poor sediment recovery or geographic heterogeneity of the δ 13 C signal. Benthic and planktic foraminiferal mass accumulation rates markedly declined during MECO, indicating a reduction of planktic foraminiferal production and export productivity. Vertical δ 13 C gradients do not indicate major changes in water column stratification, and there is no biomarker or micropaleontological evidence that hypoxia developed. We suggest that temperature dependency of metabolic rates could explain the observed decrease in foraminiferal productivity during warming. The kinetics of biochemical reactions increase with temperature, more so for heterotrophs than for autotrophs. Steady warming during MECO may have enhanced heterotroph (i.e., foraminiferal) metabolic rates, so that they required more nutrients. These additional nutrients were not available because of the oligotrophic conditions in the region and the lesser response of primary producers to warming. The combination of warming and heterotroph starvation altered pelagic food webs, increased water column recycling of organic carbon, and decreased the amount of organic carbon available to the benthos.

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Planktonic foraminiferal oxygen isotope analysis by ion microprobe technique suggests warm tropical sea surface temperatures during the Early Paleogene

Cited by 81 publications

References 101 publications

Modeling the effects of diagenesis on carbonate clumped-isotope values in deep- and shallow-water settings

Modeling the effects of diagenesis on carbonate clumped-isotope values in deep- and shallow-water settings

Rapid and sustained surface ocean acidification during the Paleocene‐Eocene Thermal Maximum

The middle Eocene climatic optimum (MECO): A multiproxy record of paleoceanographic changes in the southeast Atlantic (ODP Site 1263, Walvis Ridge)

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