Size‐Fraction‐Specific Stable Isotope Variations as a Framework for Interpreting Early Eocene Bulk Sediment Carbon Isotope Records

Bhattacharya, Joyeeta; Yeung, Laurence Y.; Cong, Lin; Dickens, Gerald R.; Sun, Tao

doi:10.1029/2020pa004132

Cited by 3 publications

(2 citation statements)

References 92 publications

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“…Typically, for calcareous marine sediment deposited well away from the coast, bulk carbonate isotopes principally derive from calcareous nannofossils which inhabit the surface mixed layer (Stoll 2005, Reghellin et al 2015, Bhattacharya et al 2021. Remarkably, however, the bulk δ 13 C record of Hole RH-323 is in very close agreement with the benthic records, not only in trends (see Discussion 5.2) but also in absolute values.…”

Section: Absolute Values Of Bulk Carbonate Carbon Isotopesmentioning

confidence: 71%

“…For instance, in marginal settings, the bulk δ 13 C signal can contain large amounts of material transported from adjacent neritic environments (Swart 2008. Another case arises with high contents of planktonic or benthic foraminifera, both that can have significantly different δ 13 C compositions than calcareous nannoplankton (Reghellin et al 2015, Bhattacharya et al 2021). In addition, high primary production might regionally lead to a rise in surface ocean δ 13 C of DIC as 12 C is preferentially fixed, but that does not explain our low values.…”

Section: Absolute Values Of Bulk Carbonate Carbon Isotopesmentioning

confidence: 99%

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Late Paleocene to middle Eocene carbon isotope stratigraphy of the Northern Negev, Southern Israel: potential for paleoclimate reconstructions

Fokkema¹,

Buijs²,

Bialik³

et al. 2022

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Sedimentary records depicting significant variability in climate and carbon cycling across the early Paleogene have emerged over the last two decades. Continuous, long-term, high-resolution records mostly derive from deep-sea drill cores, and only few derive from continental margin locations. Here we examine lower Paleogene marls and chalks collected from a core (RH-323) in the Northern Negev Desert (Southern Israel). The studied sediments accumulated on a continental slope of the southern Tethys at ~500-700 m paleodepth and did not undergo deep burial. We analyzed bulk carbonate stable carbon and oxygen isotopes and bulk magnetic susceptibility. The resulting records can be aligned with those from elsewhere and include the Paleocene Carbon Isotope Maximum (PCIM), Paleocene Eocene Thermal Maximum (PETM) and Early Eocene Climatic Optimum (EECO). An obvious realization is a concurrence between local lithological variations and major climate and carbon cycle changes. This has been highlighted for sedimentary sequences elsewhere, but the relations differ in the Negev, such that carbonate rich intervals mark the PCIM and PETM, and a transition from marl to chalk initiates the EECO. Overall, the relatively pristine and immature sediment records in southern Israel likely provide potential for high-resolution paleoclimate and carbon cycle reconstructions during a crucial time interval and in a crucial part of the world.

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Section: Absolute Values Of Bulk Carbonate Carbon Isotopesmentioning

confidence: 71%