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  • 1990-1994  (29)
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  • 1
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    Calcareous nannofossils across the Cretaceous/Paleocene boundary in the southern Indian Ocean (1992)
    PANGAEA
    In:  Supplement to: Ehrendorfer, Thomas; Aubry, Marie-Pierre (1992): Calcareous nannoplankton changes across the Cretaceous/Paleocene boundary in the southern Indian Ocean. In: Wise, SW; Schlich, R; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 120, 451-470, https://doi.org/10.2973/odp.proc.sr.120.148.1992
    Details
    Publication Date: 2024-01-09
    Description: Changes in the composition of calcareous nannoplankton across the Cretaceous/Paleocene boundary at southern high-latitude Ocean Drilling Program Hole 750A are documented in this semiquantitative study. These changes are compared with changes described from other localities at high- and low-latitudes. This study provides additional data toward a detailed documentation of the paleontologic changes that occurred in the late Maestrichtian and the early Paleocene, despite limitations to the interpretation caused by coring gaps, drilling disturbance, and the presence of an unconformity at the boundary at this site.
    Keywords: 120-750A; DRILL; Drilling/drill rig; Joides Resolution; Leg120; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean
    Type: Dataset
    Format: application/zip, 3 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    Occurrence and stratigraphy of Coccolithus pelagicus in ODP Hole 120-747A (1992)
    PANGAEA
    In:  Supplement to: Beaufort, Luc; Aubry, Marie-Pierre (1992): Paleoceanographic implications of a 17-m.y.-long record of high-latitude Miocene calcareous nannoplankton fluctuations. In: Wise, SW; Schlich, R; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 120, 539-549, https://doi.org/10.2973/odp.proc.sr.120.147.1992
    Details
    Publication Date: 2024-01-09
    Description: A record based on counts of the relative abundance of the dominant calcareous nannofossil taxa Coccolithus pelagicus and Reticulofenestra spp. in sediments recovered from Ocean Drilling Program Hole 747A (Kerguelen Plateau, Southern Indian Ocean) is established in this paper. This record (17 m.y. long) virtually spans the entire Miocene. Broad, steplike variations in the abundance of C. pelagicus range between 0% and 96%. Based on these variations, five stratigraphic units characterized by high abundance in C. pelagicus are delineated. We suggest that these variations are caused by water-mass movements (such as the north/south shifting of a front). This pronounced signal is compared with paleoceanographic events revealed by isotopic (d18O and d13C) studies. The five defined units are tentatively correlated to well-known global isotopic events. In particular, Units A and D correlate respectively with the Oligocene/Miocene boundary glaciation and the middle Miocene cooling event. Time-series analysis indicates the presence of the three main periodic components of the eccentricity of the Earth's orbit. A 200-k.y. cycle is also present. The stratigraphic and paleoceanographic significance of this record is discussed.
    Keywords: 120-747A; DRILL; Drilling/drill rig; Joides Resolution; Leg120; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    Chemobiostratigraphy of the Cretaceous/Paleocene boundary at ODP Hole 120-750A (1992)
    PANGAEA
    In:  Supplement to: Zachos, James C; Aubry, Marie-Pierre; Berggren, William A; Ehrendorfer, Thomas; Heider, Franz; Lohmann, Kyger C (1992): Chemobiostratigraphy of the Cretaceous/Paleocene boundary at Site 750, Southern Kerguelen Plateau. In: Wise, SW; Schlich, R; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 120, 961-977, https://doi.org/10.2973/odp.proc.sr.120.188.1992
    Details
    Publication Date: 2024-01-09
    Description: An integrated biostratigraphic and stable isotope investigation was conducted on a high-latitude sequence across the Cretaceous/Paleogene (K/P) boundary recovered in Hole 750A in the southern Indian Ocean. The sequence consists of nannofossil chalk and is discontinuous across the boundary; missing is an estimated 0.3-m.y. late Maestrichtian and early Danian interval. Nonetheless, because calcareous nannofossil Zones NP1 and NP2 are well-developed, micropaleontological studies of the sequence have yielded a detailed record of Danian high-latitude microplankton evolution. In addition, stable carbon isotope analyses of planktonic and benthic foraminifer and bulk samples provide a record of late Maestrichtian and early Danian surface- and deep-water carbon isotope variations. Together, the carbon isotope and carbonate accumulation records serve as an index of regional marine net productivity across the boundary. Earliest Danian nannoplankton assemblages consisted mainly of persistent genera that were generally rare or absent in the Upper Cretaceous at Hole 750A. However, by 0.5-0.6 m.y. after the boundary, newly evolving Danian taxa became dominant. The turnover in nannofossil assemblages was accompanied by significant changes in rates of net productivity as gauged by carbon isotope distributions and carbonate accumulation rates. During the period dominated by persistent taxa, net productivity was extremely low, as reflected by the absence of vertical delta13C gradients and reduced carbonate accumulation rates. Later in the Danian, as new species evolved and flourished, vertical delta13C gradients reappeared and carbonate accumulation rates increased, signaling partial recovery of net productivity in this region. The absolute timing and magnitude of late Maestrichtian and early Danian biotic and geochemical changes in the southern Indian Ocean were similar to those recorded in other pelagic K/P boundary sequences from low- and mid-latitude Atlantic and Pacific sites, indicating that these events were ubiquitous.
    Keywords: 120-750A; DRILL; Drilling/drill rig; Joides Resolution; Leg120; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean
    Type: Dataset
    Format: application/zip, 4 datasets
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    DATA PANGAEA
  • 4
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    Paleogene calcareous nannofossil stratigraphy of ODP Leg 120 sites (1992)
    PANGAEA
    In:  Supplement to: Aubry, Marie-Pierre (1992): Paleogene calcareous nannofossils from the Kerguelen Plateau, Leg 120. In: Wise, SW; Schlich, R; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 120, 471-491, https://doi.org/10.2973/odp.proc.sr.120.149.1992
    Details
    Publication Date: 2024-01-09
    Description: Calcareous nannofossils are abundant in the Paleogene sediments recovered during Ocean Drilling Program Leg 120. Although no continuous Paleogene section was obtained, Sites 747 through 751 complemented each other so as to provide a virtually complete composite stratigraphic section. The calcareous nannofossil biostratigraphy at Sites 747, 748, and 749 is discussed. Correlation of calcareous nannofossil biozones and magnetozones at these sites suggests some diachrony with low-latitude areas, as well as on a regional basis. Changes in calcareous nannofossil diversity throughout the Paleogene are analyzed and interpreted as reflecting major paleoclimatic events.
    Keywords: 120-747A; 120-747C; 120-748B; 120-748C; 120-749B; 120-749C; DRILL; Drilling/drill rig; Joides Resolution; Leg120; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean
    Type: Dataset
    Format: application/zip, 5 datasets
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    DATA PANGAEA
  • 5
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    Stable isotope record and trace element ratios of Eocene and Oligocene foraminifers from ODP Site 120-748 (1992)
    PANGAEA
    In:  Supplement to: Zachos, James C; Berggren, William A; Aubry, Marie-Pierre; Mackensen, Andreas (1992): Isotope and trace element geochemistry of Eocene and Oligocene foraminifers from Site 748, Kerguelen Plateau. In: Wise, SW; Schlich, R; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 120, 839-854, https://doi.org/10.2973/odp.proc.sr.120.183.1992
    Details
    Publication Date: 2024-01-09
    Description: Stable carbon and oxygen isotope analyses were conducted on well-preserved planktonic and benthic foraminifers from a continuous middle Eocene to Oligocene sequence at Ocean Drilling Program (ODP) Site 748 on the Kerguelen Plateau. Benthic foraminifer d18O values show a 1.0 per mil increase through the middle and upper Eocene, followed by a rapid 1.2 per mil increase in the lowermost Oligocene (35.5 Ma). Surface-dwelling planktonic foraminifer d18O values increase in the lowermost Oligocene, but only by 0.6 per mil whereas intermediate-depth planktonic foraminifers show an increase of about l.0 per mil. Benthic foraminifer d13C values increase by 0.9 per mil in the lowermost Oligocene at precisely the same time as the large d18O increase, whereas planktonic foraminifer d13C values show little or no change. Site 748 oxygen isotope and paleontological records suggest that southern Indian Ocean surface and intermediate waters underwent significant cooling from the early to late Eocene. The rapid 1.2 per mil oxygen isotope increase recorded by benthic foraminifers just above the Eocene/Oligocene boundary represents the ubiquitous early Oligocene d18O event. The shift here is unique, however, as it coincided with the sudden appearance of ice-rafted debris (IRD), providing the first direct link between Antarctic glacial activity and the earliest Oligocene d18O increase. The d18O increase caused by the ice-volume change in the early Oligocene is constrained by (1) related changes in the planktonic to benthic foraminifer d18O gradient at Site 748 and (2) comparisons of late Eocene and early Oligocene planktonic foraminifer d18Ovalues from various latitudes. Both of these records indicate that 0.3 per mil to 0.4 per mil of the early Oligocene d18O increase was ice-volume related.
    Keywords: 120-748; 120-748B; 120-748C; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Joides Resolution; Leg120; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean
    Type: Dataset
    Format: application/zip, 6 datasets
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  • 6
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    (Table 2) Abundances of nannofossils in the lower Danian of ODP Hole 120-750A (1992)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 120-750A; Cruciplacolithus spp.; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Hornibrookina spp.; Joides Resolution; Leg120; Nannofossils indeterminata; Ocean Drilling Program; ODP; Prinsius spp.; Sample code/label; South Indian Ridge, South Indian Ocean; Thoracosphaera spp.
    Type: Dataset
    Format: text/tab-separated-values, 112 data points
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  • 7
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    (Figure 6) Range chart of planktonic foraminifers across the K/T boundary at ODP Hole 120-750A (1992)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 120-750A; Abathomphalus mayaroensis; Chiloguembelina morsei; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Eoglobigerina edita; Eoglobigerina eobulloides; Epoch; Globanomalina archeocompressa; Globanomalina planocompressa; Globigerinelloides messinae; Globigerinelloides subcarinatus; Globoconusa daubjergensis; Guembelitria cretacea; Guembelitria sp.; Guembelitria trifolia; Hedbergella monmouthensis; Heterohelix sp.; Joides Resolution; Leg120; Ocean Drilling Program; ODP; Paragloborotalia pseudobulloides; Paragloborotalia taurica; Planktic foraminifera zone; Praeglobotruncana havanensis; Rugoglobigerina macrocephala; Rugoglobigerina pustula; Rugoglobigerina rugosa; Sample code/label; South Indian Ridge, South Indian Ocean; Subbotina trivialis; Woodringina claytonensis; Woodringina hornerstownensis
    Type: Dataset
    Format: text/tab-separated-values, 401 data points
    Location Call Number Limitation Availability
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  • 8
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    (Table 1) Paleogene calcareous nannofossil stratigraphy of ODP Hole 120-747A (1992)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 120-747A; Biantholithus sparsus; Biscutum constans; Chiasmolithus altus; Chiasmolithus bidens; Chiasmolithus consuetus; Chiasmolithus danicus; Chiasmolithus eograndis; Chiasmolithus expansus; Chiasmolithus grandis; Chiasmolithus solitus; Chiphragmalithus sp.; Coccolithus crassus; Coccolithus luminis; Coccolithus pelagicus; Cruciplacolithus edwardsii; Cruciplacolithus primus; Cruciplacolithus tenuis; DEPTH, sediment/rock; Discoaster barbadiensis; Discoaster binodosus; Discoaster cruciformis; Discoaster diastypus; Discoaster distinctus; Discoaster elegans; Discoaster falcatus; Discoaster kuepperi; Discoaster lodoensis; Discoaster mohleri; Discoaster multiradiatus; Discoaster robustus; Discoaster saipanensis; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Ellipsolithus cf. lajollaensis; Ellipsolithus distichus; Ellipsolithus macellus; Epoch; Ericsonia formosa; Ericsonia subpertusa; Fasciculithus tympaniformis; Helicosphaera sp. H. cf. paleocarteri; Heliolithus spp.; Hornibrookina australis; Hornibrookina teuriensis; Joides Resolution; Leg120; Lophodolithus nascens; Markalius inversus; Nannofossil abundance; Nannofossils, reworked cretaceous; Nannofossils preservation; Nannofossil zone; Neochiastozygus cearae; Neochiastozygus distentus; Neochiastozygus junctus; Neococcolithes dubius; Neococcolithes seapes cf.; Ocean Drilling Program; ODP; Placozygus sigmoides; Pontosphaera fimbriata; Pontosphaera sp.; Prinsius bisulcus; Prinsius martinii; Reticulofenestra bisecta; Reticulofenestra dictyoda; Reticulofenestra floridana; Reticulofenestra hampdenensis; Reticulofenestra hesslandii; Reticulofenestra hillae; Reticulofenestra samodurovii; Reticulofenestra umbilicus; Sample code/label; Scampanella sp.; Smear slide analysis; South Indian Ridge, South Indian Ocean; Sphenolithus moriformis; Sphenolithus primus; Sphenolithus radians; Thoracosphaera spp.; Toweius callosus; Toweius eminens; Toweius magnicrassus; Toweius pertusus; Toweius tovae; Tribrachiatus orthostylus; Zygrhablithus bijugatus
    Type: Dataset
    Format: text/tab-separated-values, 7113 data points
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  • 9
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    (Table 4) Paleogene calcareous nannofossil stratigraphy of ODP Hole 120-748C (1992)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 120-748C; Biantholithus sparsus; Blackites tenuis; Braarudosphaera bigelowii; Chiasmolithus bidens; Chiasmolithus consuetus; Chiasmolithus danicus; Chiasmolithus eograndis; Chiasmolithus expansus; Chiasmolithus grandis; Chiasmolithus solitus; Coccolithus eopelagicus; Coccolithus pelagicus; Cruciplacolithus tenuis; DEPTH, sediment/rock; Discoaster barbadiensis; Discoaster binodosus; Discoaster cruciformis; Discoaster delicatus; Discoaster diastypus; Discoaster distinctus; Discoaster falcatus; Discoaster gemmeus; Discoaster kuepperi; Discoaster lenticularis; Discoaster lodoensis; Discoaster mohleri; Discoaster multiradiatus; Discoaster nobilis; Discoaster saipanensis; Discoaster tanii nodifer; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Ellipsolithus bollii; Ellipsolithus distichus; Ellipsolithus macellus; Epoch; Ericsonia formosa; Ericsonia subpertusa; Fasciculithus tympaniformis; Heliolithus cantabriae; Heliolithus conicus; Heliolithus elegans; Heliolithus kleinpellii; Heliolithus megastypus; Heliolithus universus; Joides Resolution; Leg120; Lophodolithus nascens; Markalius inversus; Micrantholithus vesper; Nannofossil abundance; Nannofossils preservation; Nannofossil zone; Neochiastozygus cearae; Neochiastozygus chiastus; Neochiastozygus concinnus; Neochiastozygus distentus; Neochiastozygus junctus; Neococcolithes dubius; Neococcolithes protenus; Neocrepidolithus bukryi; Ocean Drilling Program; ODP; Placozygus sigmoides; Pontosphaera fimbriata; Pontosphaera multipora; Pontosphaera versa; Prinsius bisulcus; Prinsius martinii; Pseudotriquetrorhabdulus inversus; Reticulofenestra dictyoda; Reticulofenestra floridana; Reticulofenestra hampdenensis; Reticulofenestra hillae; Reticulofenestra prebisecta; Reticulofenestra pseudogammation; Reticulofenestra samodurovii; Reticulofenestra umbilicus; Sample code/label; Scampanella sp.; Semihololithus kerabyi; Smear slide analysis; South Indian Ridge, South Indian Ocean; Sphenolithus moriformis; Sphenolithus primus; Sphenolithus radians; Toweius callosus; Toweius eminens; Toweius magnicrassus; Toweius pertusus; Toweius tovae; Tribrachiatus orthostylus; Zygodiscus adamas; Zygodiscus plectopons; Zygrhablithus bijugatus
    Type: Dataset
    Format: text/tab-separated-values, 2580 data points
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  • 10
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    (Table 3) Stable isotope ratios of foraminifera and bulk carbonate from ODP Hole 120-750A (1992)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 120-750A; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Eoglobigerina eobulloides, δ13C; Eoglobigerina eobulloides, δ18O; Globigerinelloides spp., δ13C; Globigerinelloides spp., δ18O; Heterohelix globulosa, δ13C; Heterohelix globulosa, δ18O; Joides Resolution; Leg120; Mass spectrometer Finnigan MAT 251; Nuttallides truempyi, δ13C; Nuttallides truempyi, δ18O; Ocean Drilling Program; ODP; Sample code/label; South Indian Ridge, South Indian Ocean; Stensioeina beccariiformis, δ13C; Stensioeina beccariiformis, δ18O; δ13C, bulk carbonate; δ13C, carbonate; δ18O, bulk carbonate; δ18O, carbonate
    Type: Dataset
    Format: text/tab-separated-values, 238 data points
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