Biogeography of benthic foraminifera of the northern Nazca plate and adjacent continental margin

Resig, Johanna M.

doi:10.1130/mem154-p619

Cited by 75 publications

(58 citation statements)

References 12 publications

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“…Numerous quantitative core-top studies of benthic foraminiferal distributions have now been conducted in all oceans (Streeter, 1973;Schnitker, 1974;Culp, 1977;Gofas, 1978;Lohmann, 1978;Ingle et al, 1980;Resig, 1981). These studies form a basis for the extrapolation Core-section (interval in cm) 9-3, 20-22 10-2, 20-22 10-2, 120-122 10-3, 70-72 11-2, 20-22 11-2, 70-72 11-2, 120-122 11-3,20-22 11-3, 70-72 12-1, 120-122 12-2, 20-22 12-2, 70-72 12-2, 120-122 12-3, 20-22 12-3, 120- of modern assemblage-water mass relationships into the geologic past.…”

Section: Benthic Foraminifersmentioning

confidence: 99%

Climatically Induced Changes in Vertical Water Mass Structure of the Vema Channel during the Pliocene: Evidence from Deep Sea Drilling Project Holes 516A, 517, and 518

Hodell¹,

Kennett²,

Leonard³

1983

Initial Reports of the Deep Sea Drilling Project

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Pliocene changes in the vertical water mass structure of the western South Atlantic are inferred from changes in benthic foraminiferal assemblages and stable isotopes from DSDP Holes 516A, 517, and 518. Factor analysis of 34 samples from Site 518 reveals three distinct benthic foraminiferal assemblages that have been associated with specific subsurface water masses in the modern ocean. These include a Nuttalides umbonifera assemblage (Factor 1) associated with Antarctic Bottom Water (AABW), a Globocassidulina subglobosa-Uvigerina peregrina assemblage (Factor 2) associated with Circumpolar Deep Water (CPDW), and an Oridorsalis umbonatus-Epistominella exigua assemblage associated with North Atlantic Deep Water (NADW). Bathymetric gradients in Δ 13 C between Holes 516A (1313 m), 517 (2963 m), and 518 (3944 m) are calculated whenever possible to monitor the degree of similarity and/or difference in the apparent oxygen utilization (AOU) of water masses located at these depths during the Pliocene. Changes in bathymetric Δ 13 C gradients coupled with benthic foraminiferal assemblages record fundamental changes in the vertical water mass structure of the Vema Channel during the Pliocene from 4.1 to 2.7 Ma.At Site 518, the interval from 4.1 to 3.6 Ma is dominated by the N. umbonifera (Factor 1) and O. umbonatus-E. exigua (Factor 3) assemblages. The Δ 13 C gradient between Holes 518 (3944 m) and 516A (1313 m) undergoes rapid oscillations during this interval though no permanent increase in the gradient is observed. However, δ13 C values at Site 518 are clearly lighter during this interval. These conditions may be related to increased bottom water activity associated with the re-establishment of the West Antarctic Ice Sheet in the late Gilbert Chron (-4.2 to 3.6 Ma) (Osborn et al., 1982).The interval from 3.6 to 3.2 Ma is marked by a dominance of the G. subglobosa-U. peregrina (Factor 2) assemblage and lack of a strong Δ 13 C gradient between Holes 518 (3944 m) and 516A (1313 m). We suggest that shallow circumpolar waters expanded to depths of a least 3944 m (Site 518) during this time.The most profound faunal and isotopic change occurs at 3.2 Ma, and is marked by dominance of the N. umbonifera (Factor 1) and O. umbonatus-E. exigua (Factor 3) assemblages, a l.l‰ enrichment in δ 18 θ, and a large negative increase in the Δ 13 C gradient between Holes 518 and 516A. These changes at Site 518 record the vertical displacement of circumpolar waters by AABW and NADW. This change in vertical water mass structure at 3.2 Ma was probably related to a global cooling event and/or final closure of the Central American seaway. A comparison of the present-day δ 13 C structure of the Vema Channel with a reconstruction between 3.2 and 2.7 Ma indicates that circulation patterns during this late Pliocene interval were similar to those of the modern western South Atlantic.

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Section: Benthic Foraminifersmentioning

confidence: 99%

Climatically Induced Changes in Vertical Water Mass Structure of the Vema Channel during the Pliocene: Evidence from Deep Sea Drilling Project Holes 516A, 517, and 518

Hodell¹,

Kennett²,

Leonard³

1983

Initial Reports of the Deep Sea Drilling Project

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“…Not much is known about the ecology of B. costata, as well as its distribution in the global oceans. Previous observations off Peru reported its tolerance to oxygen minimum conditions (Khusid, 1974;Resig, 1981;Mallon et al, 2012) and even to sulfidic pore waters (Cardich et al, 2015). Another downcore application from the Peruvian margin used this species as high upwelling and low oxygen indicator (Heinze and Wefer, 1992).…”

Section: Discussionmentioning

confidence: 99%

“…Cassidulina delicata is one of the common species of upper-middle bathyal assemblages (500-1 000 m) offshore Peru and Chile (Ingle et al, 1980;Resig, 1981) and offshore California (Bandy, 1953;Zalesny, 1959;Uchio, 1960). It occurred dominantly together with Epistominella pacifica, E. smithi, and Bolivinita minuta.…”

Section: Discussionmentioning

confidence: 99%

“…Recent benthic foraminifera from the Peruvian and Chilean shelf and margin were previously documented by Bandy and Rodolfo (1964), Phleger and Soutar (1973), Khusid (1974), Ingle et al (1980), Resig (1981), , Schönfeld and Spiegler (1995), Figueroa et al (2005), Morales et al (2006), Tapia et al (2008), Cardich et al (2012), Mallon (2012), Mallon et al (2012), and Cardich et al (2015). Some studies focused on living (rose Bengal stained) foraminiferal faunas (Tapia et al, 2008;Cardich et al, 2012;Mallon, 2012;Mallon et al, 2012;Cardich et al, 2015), but most of them considered dead or subfossil assemblages in nearsurface sediments.…”

Section: Introductionmentioning

confidence: 99%

“…Large miliolids were also reported being restricted to higher bottom water oxygen concentrations (in Arabian Sea >16 μmol/kg; Caulle et al, 2014) and suggested as a proxy for rapid ventilation of oxygen-depleted environments (den Dulk et al, 2000). In particular, species of the family Bolivinitidae are tolerant to the suboxic conditions, and they occur in large numbers in the Peruvian OMZ (Phleger and Soutar, 1973;Khusid, 1974;Manheim et al, 1975;Ingle et al, 1980;Resig, 1981;Heinze and Wefer, 1992). Bolivina species, for instance, have shown an oxygen related distribution pattern .…”

Section: Introductionmentioning

confidence: 99%

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