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Norris, Richard D; Corfield, Richard M; Cartlidge, Julie E (1994): Stable carbon and oxygen isotope ratios of Miocene to Recent foraminifera from the Rio Grande Rise, South Atlantic [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.682994, Supplement to: Norris, RD et al. (1994): Evolutionary ecology of Globorotalia (Globoconella) (planktic foraminifera). Marine Micropaleontology, 23(2), 121-145, https://doi.org/10.1016/0377-8398(94)90004-3

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Abstract:
Miocene to Recent species of planktic foraminifera in the Globorotalia (Globoconella) lineage evolved entirely within the thermocline. All species are most abundant within subtropical-temperate watermasses throughout their history. The near stasis in distribution within the thermocline and the subtropical convergence suggests the major morphological changes in Globorotalia (Globoconella) may have occurred through habitat subdivision rather than by vicariant shifts into new watermasses.
At the Rio Grande Rise, in the South Atlantic, modern G. inflata is 0.66-0.84‰ more positive for delta18O than the most enriched coexisting Globigerinoides sacculifer and probably grows in the mid thermocline deeper than 325 m. All extinct globoconellid species have mean delta18O ratios 0.5-0.8‰ more positive than Globigerinoides trilobus and G. sacculifer and probably lived within the thermocline as well.
Major events in skeletal evolution are poorly correlated with changes in delta18O in this group. These include evolutionary transitions to compressed, smooth-walled tests and acquisition of keels. In addition, morphological reversals from the umbilically-inflated G. conomiozea to biconvex G. pliozea and to unkeeled G. puncticulata occur in the absence of changes in delta18O signature. Instead, the ranges of delta18O between different species almost completely overlap once corrected for temporal changes in delta18O of sea water. Foraminifera morphologies have been widely considered to evolve in response to changes in watermasses or depth habitats. However, the variety of skeletal shapes in the globoconellid lineage apparently are not adaptations to a progressive radiation from the surface mixed layer into deeper waters.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: -30.180933 * Median Longitude: -35.378500 * South-bound Latitude: -30.276500 * West-bound Longitude: -35.565000 * North-bound Latitude: -29.990000 * East-bound Longitude: -35.285200
Date/Time Start: 1974-05-03T00:00:00 * Date/Time End: 1980-03-11T00:00:00
Event(s):
72-516 * Latitude: -30.276300 * Longitude: -35.285200 * Date/Time: 1980-03-11T00:00:00 * Elevation: -1313.0 m * Penetration: 183.3 m * Recovery: 148.1 m * Location: South Atlantic/CONT RISE * Campaign: Leg72 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 40 cores; 166.1 m cored; 17.2 m drilled; 89.2 % recovery
72-516A * Latitude: -30.276500 * Longitude: -35.285300 * Date/Time: 1980-03-11T00:00:00 * Elevation: -1313.0 m * Penetration: 69.5 m * Recovery: 60.9 m * Location: South Atlantic/CONT RISE * Campaign: Leg72 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 15 cores; 65.1 m cored; 4.4 m drilled; 93.6 % recovery
CH115-73PC * Latitude: -29.990000 * Longitude: -35.565000 * Date/Time: 1974-05-03T00:00:00 * Elevation: -2150.0 m * Location: Rio Grande Rise * Campaign: Chain115 (CH115) * Basis: Chain * Method/Device: Core (CORE)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets

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Datasets listed in this publication series

  1. Norris, RD; Corfield, RM; Cartlidge, JE (1994): (Table 1) Stable carbon and oxygen isotope ratios of Miocene to Recent foraminifera from DSDP Hole 72-516 on the Rio Grande Rise, South Atlantic. https://doi.org/10.1594/PANGAEA.682989
  2. Norris, RD; Corfield, RM; Cartlidge, JE (1994): (Table 2) Stable carbon and oxygen isotope ratios of Miocene to Recent foraminifera from DSDP Hole 72-516A on the Rio Grande Rise, South Atlantic. https://doi.org/10.1594/PANGAEA.682991
  3. Norris, RD; Corfield, RM; Cartlidge, JE (1994): (Table 3) Stable carbon and oxygen isotope ratios of foraminifera from surface sediments of the Rio Grande Rise, South Atlantic. https://doi.org/10.1594/PANGAEA.682993