Carbon and oxygen isotopic disequilibria of recent deep-sea benthic foraminifera

Graham, David W.; Corliss, Bruce H.; Bender, Michael L.; Keigwin, Lloyd D

doi:10.1016/0377-8398(81)90018-9

Cited by 293 publications

(140 citation statements)

References 21 publications

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“…Table 2 lists the isotopic differences DISCUSSION Cibicidoides is the best sensor of bottom water conditions, with respect to both δ 18 θ and δ 13 C (Belanger et al, 1981;Graham et al, 1981). The two preliminary data points on Hanzawaia cushmani are in close agreement with Cibicidoides data, suggesting that Hanzawaia may be another good sensor of bottom water conditions.…”

Section: Resultsmentioning

confidence: 60%

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The Foraminiferal Isotope Record across the Eocene/Oligocene Boundary at Deep Sea Drilling Project Site 540

Bélanger¹,

Matthews²

1984

Initial Reports of the Deep Sea Drilling Project, 77

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We analyzed the oxygen and carbon isotopic composition of planktonic and benthic foraminifers picked from 13 late Eocene to late Oligocene samples from DSDP Site 540 (23°49.73'N, 84°22.25'W, 2926 m water depth) from the Gulf of Mexico. An enrichment occurs in 18 O of about 0.5 to 0.8‰ in both benthic foraminifers and surface-dwelling planktonic foraminifers between the latest Eocene and early Oligocene. This early Oligocene maximum is followed by lower18 O values. A 1.2‰ δ 13 C decrease in both benthic and planktonic foraminiferal data occurs from the late Eocene to the late Oligocene. There is a correspondence of the 13 C signal to deep-sea records; however, the amplitude of this change is greater than previously seen in deep-sea cores, possibly as a result of proximity to terrestrial sources of carbon.The covarying isotopic changes in both benthic and planktonic foraminifers suggest global causes, such as ice volume increases and increased terrestrial carbon input to the ocean. However, during the latter part of the record (earlylate Oligocene), the increases in the benthic 18 O without accompanying increases observed with planktonic foraminifers suggest that changes in only one part of the system occurred; one potential explanation being a decrease in bottom-water temperatures without concomitant changes in the surface waters. The 18 O differences between species of planktonic foraminifers and the difference between planktonic and benthic 18 O data indicate that diagenesis problems are minimal. These preliminary results are encouraging given that these cores are partially lithified.

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Section: Resultsmentioning

confidence: 60%

“…In Holocene core top studies, this taxon has been shown to be a good interregional sensor for both the interregional δ 18 θ variations of seawater, and the δ 13 C of ECO 2 of the modern ocean (Belanger et al, 1981;Graham et al, 1981). Three analyses on Oridorsalis spp.…”

Section: Methodsmentioning

confidence: 99%

The Foraminiferal Isotope Record across the Eocene/Oligocene Boundary at Deep Sea Drilling Project Site 540

Bélanger¹,

Matthews²

1984

Initial Reports of the Deep Sea Drilling Project, 77

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“…Both species are known to live on the sediment/ water interface, F. wuellerstorfi, mainly attached to hard substrates protruding from the sediment [Linke and Lutze, 1993] while, E. exigua, prefers phytodetritus layers deposited on the seafloor as its primary habitat [Gooday, 1988[Gooday, , 1993Cornelius and Gooday, 2004]. Carbon isotope ratios of F. wuellerstorfi is known to be close to bottom water d 13 C DIC [Woodruff et al, 1980;Belanger et al, 1981;Graham et al, 1981;Zahn et al, 1986;Curry et al, 1988 [Mackensen et al, 1993a]. However, the relationship between the accumulation of organic material and the deviation from d 13 C DIC is not straightforward.…”

Section: Stable Carbon Isotopesmentioning

confidence: 99%

“…For this reason, d 13 C of these taxa does not directly reflect the ambient deep water chemistry and its use in deepwater paleoceanography is limited. Epifaunal species such as Fontbotia wuellerstorfi (also named Planulina, Cibicides or Cibicidoides) which live on elevated substrates [Linke and Lutze, 1993], are widely used as carriers of deep water circulation signals since they are in direct contact with ambient bottom waters and variations of d 13 C in their shells is believed to more closely follow changes in d 13 C of dissolved inorganic carbon (d 13 C DIC ) of ambient bottom waters [Woodruff et al, 1980;Belanger et al, 1981;Graham et al, 1981;Curry et al, 1988;McCorkle and Keigwin, 1994]. Carbon isotopes of epifaunal species may still become offset from ambient bottom water d 13 C DIC if the supply of the organic matter to the seafloor is high and/ or highly seasonal and leads to the deposition of a phytodetritus layer on the seafloor [Mackensen et al, 1993aBickert and Wefer, 1999;Corliss et al, 2002].…”

Section: Introductionmentioning

confidence: 99%

Paleoceanography of the southern Agulhas Plateau during the last 150 ka: Inferences from benthic foraminiferal assemblages and multispecies epifaunal carbon isotopes

et al. 2007

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[1] Benthic foraminiferal assemblages and the carbon isotope composition of the epifaunal benthic foraminifera Epistominella exigua and Fontbotia wuellerstorfi have been investigated along core MD02-2589 located at the southern Agulhas Plateau (41°26.03 0 S, 25°15.30 0 E, 2660 m water depth). This study aims to evaluate changes in the benthic paleoenvironment and its influence on benthic d 13 C with a notable focus on E. exigua, a species associated with phytodetritus deposits and poorly studied in isotope paleoceanographic reconstructions. The benthic foraminiferal assemblages (>63 mm) show large fluctuations in species composition suggesting significant changes in the pattern of ocean surface productivity conceivably related to migrations of the Subtropical Convergence (STC) and Subantarctic Front (SAF). Low to moderate seasonality and relatively higher food supply to the seafloor are indicated during glacial marine isotope stages (MIS) 6, 4, and 2 and during MIS 3, probably associated with the northward migration of the SAF and confluence with the more stationary STC above the southern flank of the Agulhas Plateau. The lowest organic carbon supply to the seafloor is indicated from late MIS 5b to MIS 4 as a consequence of increased influence of the Agulhas Front (AF) and/or weakening of the influence of the STC over the region. Episodic delivery of fresh organic matter, similar to modern conditions at the core location, is indicated during MIS 5c-MIS 5e and at Termination I. Comparison of this paleoenvironmental information with the paired d 13 C records of E. exigua and F. wuellerstorfi suggests that organic carbon offsets d 13 C of E. exigua from ambient bottom water d 13 C DIC , while its d 13 C amplitude, on glacial-interglacial timescales, does not seem affected by changes of organic carbon supply to the seafloor. This suggests that this species calcifies preferentially during the short time span of the year when productivity peaks and phytodetritus is delivered to the seafloor. Therefore E. exigua, while offset from d 13 C DIC , potentially more faithfully records the amplitude of ambient bottom water d 13 C DIC changes than F. wuellerstorfi, notably in settings such as the Southern Ocean that experienced substantial changes through time in the organic carbon supply to the seafloor.Citation: Diz, P., I. R. Hall, R. Zahn, and E. G. Molyneux (2007), Paleoceanography of the southern Agulhas Plateau during the last 150 ka: Inferences from benthic foraminiferal assemblages and multispecies epifaunal carbon isotopes, Paleoceanography, 22, PA4218,

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“…It is based on the calibration from plankton/core top foraminiferal oxygen isotopic ratio and seawater temperature, gathered from different parts of the world oceans including the Indian Ocean (Duplessy et al, 1981;Mulitza et al, 2003) Graham et al (1981) studied the relationship between stable isotopic composition of benthic foraminifera and seawater temperature using core top sediments from deep sea throughout the world oceans including southwestern Indian Ocean. But limited attempt has been made to understand such relationship from the southwestern Indian Ocean.…”

Section: Introductionmentioning

confidence: 99%

Oxygen isotope records of Globigerina bulloides across a north-south transect in the south-western Indian Ocean

2009

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Oxygen isotopic analysis of planktic foraminifera (Globigerina bulloides) from a total of 23 surface sediment samples collected along a north-south transect (9.69°N to 55.01°S) in the southwestern Indian Ocean during the Indian Pilot Expedition to Southern Ocean (PESO), was carried out to assess the relationship between oxygen isotopic composition and ambient seawater temperature and salinity. An increasing trend in the δ 18 O value is noticed towards higher latitude.Apparently such an increase in δ 18 O values is inversely related to the seawater temperature changes along the transect. However, slight mismatch is observed at a few stations, which is attributed to significant seawater salinity changes. The preliminary results of the present study, if extended to the subsurface sediments coupled with other parameters, may contribute to the reconstruction of the paleohydrography of the region, especially the position of various seawater fronts during the geologic past, albeit with areal limitation.

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Carbon and oxygen isotopic disequilibria of recent deep-sea benthic foraminifera

Cited by 293 publications

References 21 publications

The Foraminiferal Isotope Record across the Eocene/Oligocene Boundary at Deep Sea Drilling Project Site 540

The Foraminiferal Isotope Record across the Eocene/Oligocene Boundary at Deep Sea Drilling Project Site 540

Paleoceanography of the southern Agulhas Plateau during the last 150 ka: Inferences from benthic foraminiferal assemblages and multispecies epifaunal carbon isotopes

Oxygen isotope records of Globigerina bulloides across a north-south transect in the south-western Indian Ocean

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