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Datasets of project "Cape Roberts Project"

Mostrando recursos 1 - 20 de 224

  1. Age tie points and geochemistry of sediment cores from the Antarctic continental margin

    Passchier, Sandra; Bohaty, Steven M; Jiménez-Espejo, Francisco J; Pross, Jörg; Röhl, Ursula; van de Flierdt, Tina; Escutia Dotti, Carlota; Brinkhuis, Henk
    Few high-latitude terrestrial records document the timing and nature of the Cenozoic "Greenhouse" to "Icehouse" transition. Here we exploit the bulk geochemistry of marine siliciclastic sediments from drill cores on Antarctica's continental margin to extract a unique semiquantitative temperature and precipitation record for Eocene to mid-Miocene (~54-13 Ma). Alkaline elements are strongly enriched in the detrital mineral fraction in fine-grained siliciclastic marine sediments and only occur as trace metals in the biogenic fraction. Hence, terrestrial climofunctions similar to the chemical index of alteration (CIA) can be applied to the alkaline major element geochemistry of marine sediments on continental margins in...

  2. (Table S5) Geochemistry of sediment core CIROS-1

    Passchier, Sandra; Bohaty, Steven M; Jiménez-Espejo, Francisco J; Pross, Jörg; Röhl, Ursula; van de Flierdt, Tina; Escutia Dotti, Carlota; Brinkhuis, Henk

  3. (Table S1) Geochemistry of Cape Roberts Project sediment cores CRP-1, CRP-2, and CRP-3

    Passchier, Sandra; Bohaty, Steven M; Jiménez-Espejo, Francisco J; Pross, Jörg; Röhl, Ursula; van de Flierdt, Tina; Escutia Dotti, Carlota; Brinkhuis, Henk

  4. (Table A4) Age tie points for CIROS-1 drillhole

    Passchier, Sandra; Bohaty, Steven M; Jiménez-Espejo, Francisco J; Pross, Jörg; Röhl, Ursula; van de Flierdt, Tina; Escutia Dotti, Carlota; Brinkhuis, Henk

  5. (Table A3) Age tie points for Cape Roberts Project (CRP) drillholes, sediment cores CPR-1, CPR-2, and CPR-3

    Passchier, Sandra; Bohaty, Steven M; Jiménez-Espejo, Francisco J; Pross, Jörg; Röhl, Ursula; van de Flierdt, Tina; Escutia Dotti, Carlota; Brinkhuis, Henk

  6. Isotopic composition of sulphur in pyrite from sediment core CRP-2A

    Parnell, John

  7. Knochenjob auf dünnem Eis (film, 37 min.)

    Hertling, Peter K; Scheffler, Arno

  8. Clay mineralogy of Cape Roberts sediment cores

    Ehrmann, Werner; Setti, Massimo; Marinoni, L
    The clay mineral assemblages of the ca. 1600 m thick Cenozoic sedimentary succession recovered at the CRP-1, CRP-2/2A and CRP-3 drill sites off Cape Roberts on the McMurdo Sound shelf, Antarctica, were analysed in order to reconstruct the palaeoclimate and the glacial history of this part of Antarctica. The sequence can be subdivided into seven clay mineral units that reflect the transition from humid to subpolar and polar conditions. Unit I (35-33.6 Ma) is characterised by an almost monomineralic assemblage consisting of well crystalline, authigenic smectite, and therefore does not allow a palaeoclimatic reconstruction. Unit II (33.6-33.1 Ma) has also...

  9. Documentation of sediment core CRP-3 from core box images

    CRP Science Team

  10. Description of sediment core CRP-1

    CRP Science Team

  11. Documentation of sediment core CRP-1 from core box images

    CRP Science Team

  12. Chemical analysis of various geological samples from Northern Victoria Land, Antarctica

    Fioretti, A M; Lanza, R
    This paper reports the results of a preliminary palaeomagnetic investigation of the Admiralty Intrusives complex of northern Victoria Land, Antarctica. The samples were collected at Mt. Supernal and Inferno Peak, two pinions mainly formed of granodiorite and minor tonalite and emplaced at ab. 350 Ma at a high crustal level, as shown by amphibole geobarometric data and occurrence of miarolitic cavities. Microprobe and isothermal remanence analyses showed that magnetite. characterized by low coercivity and Curic point in the range 550-570 °C is the only primary ferromagnetic mineral. Stepwise thermaldemagnetization succeeded in isolatingamagnetization component. stable up to 530 °C. The virtual geomagnetic...

  13. Argon age determinations on sediment core CRP-2A

    McIntosh, WC
    40Ar/39Ar analyses of tephra and clasts of volcanic rock provide age constraints for upper parts of the CRP-2A core. Single-crystal laser-fusion analyses of anorthoclase phenocrysts from three tephra-bearing layers yielded the most precise age constraints for CRP-2A. The dated tephra layers are: 1) a 2.7-m-thick interval of pumice and ash layers between 111.5 and 114.2 meters below sea floor (mbsf) (weighted mean age = 21.44 ± 0.05 Ma, +2.2); 2) a concentration of pumice near 193.4 mbsf (23.98 ± 0.13 Ma): and 3) a concentration of pumice near 280 mbsf (24,22 ± 0.03 Ma) (all ages are calibrated relative to...

  14. Abundance of ostracoda in sediment cores CRP-1 and CRP-2

    Dingle, R V
    Sparse, poorly preserved late Oligocene (3 species) and early Miocene (4 species) ostracod faunas have been recovered from CRP-2A, while relatively more abundant Quaternary faunas occur in CRP-1 (24 species). All taxa are marine. No definitive age assignments can be made on the two older faunas, which are not considered to be in situ, although the taxa identified are not at variance with sediment ages determined on other grounds. The Oligocene ostracods (Lithostratigraphical Unit, LSU 9.4) suggest deposition in cold, relatively shallow, shelf waters with faunal connections to the Antarctic Peninsula and South America, while the Miocene fauna (LSU 5.1)...

  15. Preliminiary results and documentation of sediment core CRP-3 from the Ross Sea off Cape Roberts, Antarctica

    Barrett, Peter J; Webb, Peter-Noel; Aghib, Fulvia Sharon; Alberti, Mauro; Anderson, Jo; Askin, R A; Atkins, Cliff; Bohaty, Steven M; Bryce, S M; Bücker, Christian J; Bush, Stewart; Claps, Michele; Curren, Matthew; Fielding, Christopher R; Florindo, Fabio; Galeotti, Simone; Hannah, Mike J; Harris, Adam H; Harwood, David M; Henrys, Stuart; Jackson, Nick; Janecek, Thomas R; Jarrard, Richard D; Judge, Shelley; Kopsch, Conrad; Krissek, Lawrence A; Laird, M G; Lavelle, Mark; Majewski, Wojciech; Naish, Tim R; Neumann, M; Niessen, Frank; Paterson, Matt; Paulsen, Timothy S; Pompilio, Massimo; Powell, Ross; Pyne, Alex; Rafat, Ghodrat; Raine, J Ian; Roberts, Andrew P; Sandroni, Sonja; Sarti, Massimo; Schulze, Peter; Simes, J; Smellie, John L; Smith, Bruce; Sorice, Alfredo; Strong, C Percy; Talarico, Franco M; Taviani, Marco; Thorn, Vanessa C; Verosub, Kenneth Lee; Watkins, David K; Wilson, Gary S; Wilson, Terry; Wise, Sherwood W; Woolfe, Ken; Wrenn, John
    The site for CRP-3, 12 km east of Cape Roberts (77.006°S; 103.719°E)was selecte to overlap the lower Oligocene strata cored in nearby CRP-2/2A, and to sample the oldest strata in the Victoria Land Basin (VLB) for Paleogene climatic and tectonic history. As it transpired there was underlap of the order of 10s of metres. CRP-3 was cored from 3 to 939 mbsf (metres below the sea floor), with a core recovery of 97%. Coring took place from October 9 to November 19, 1999, on 2.0 to 2.2 m of sea ice and through 295 in of water. The Cenozoic strata...

  16. Preliminary results and documentation of sediment core CRP-1 from the Ross Sea off Cape Roberts, Antarctica

    CRP Science Team; Barrett, Peter J; Fielding, Christopher R; Wise, Sherwood W
    The first hole of the Cape Roberts Project, CRP-1, was drilled in October, 1997, to a depth of 148 metres below the sea floor (mbsf) before being terminated unexpectedly the loss of fast sea-ice seaward of the rig following a severe storm. The site lies in 150 m of water at 77.008°S and 163.755°E, 16 km off Cape Roberts. This part of the report outlines the geologic setting, a gently tilted sequence near the margin of the Victoria Land Basin, and describes the history of the growth of sea ice, which provided the drilling platform, as well as the history...

  17. Chemical composition of green hornblende crystals from samples of the Admiralty Intrusive complex from Mt. Supernal, northern Victoria Land, Antarctica (Table 3)

    Fioretti, A M; Lanza, R

  18. Chemical composition of green hornblende crystals from samples of the Admiralty Intrusive complex from Inferno Peak, northern Victoria Land, Antarctica (Table 3)

    Fioretti, A M; Lanza, R

  19. Bulk chemical composition of samples of the Admiralty Intrusive complex from Mt. Supernal, northern Victoria Land, Antarctica (Table 1)

    Fioretti, A M; Lanza, R

  20. Bulk chemical composition of samples of the Admiralty Intrusive complex from Inferno Peak, northern Victoria Land, Antarctica (Table 1)

    Fioretti, A M; Lanza, R

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