Taviani, Marco; Zahn, Rainer (1998): (Table 1) Stable oxygen and carbon isotope composition of bivalve shells of sediment core CRP-1, and of Wright Valley and McMurdo Sound. PANGAEA, https://doi.org/10.1594/PANGAEA.545108, Supplement to: Taviani, M; Zahn, R (1998): The stable oxygen isotope record of Pleistocene and Miocene bivalves in the CRP-1 drillhole, Victoria Land Basin, Antarctica. Terra Antartica, 5(3), 419-423, hdl:10013/epic.28302.d001
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Bivalve shells from the CRP-l drillhole, Cape Roberts (Victoria Land Basin), have been analysed for their stable isotope composition to obtain information on Antarctic coastal palaeoceanography during the middle Pleistocene and early Miocene. Shells from a middle Pleistocene carbonate-rich unit (lithostratigraphic Unit 3.1; 33.82-3 1.89 metres below sea floor) have d180 values between +3.64 and +4.56 per mil PDB and d13C between +0.85 and + 1.09 per mil PDB. Oxygen isotopic compositions are close to or at equilibrium conditions with scawater at a temperature in the range of c. -2 to 0°C in the absence of melt water influx. Thus, the CRP-1 carbonate-unit was deposited under 'interglacial' polar conditions, comparable to those of the present-day and isotope stage 3 in the Ross Sea. 'Chlamys' sp. 1, retrieved from a lower Miocene diamictite at 62.19 mbsf, is the only unaltered shell of this age in CRP-1 and yielded a d18O value of -4.64 per mil PDB and d13C of -3.35 per mil PDB. These values show that palaeoceanographic conditions during early Miocene time were significantly different from those of today. The depleted stable oxygen isotope composition of the Miocene shell reflects both an appreciable input of melt or fresh water and warmer-than-present seawater temperatures.
Median Latitude: -77.058082 * Median Longitude: 163.112804 * South-bound Latitude: -77.166667 * West-bound Longitude: 161.833333 * North-bound Latitude: -77.000000 * East-bound Longitude: 163.755080
Date/Time Start: 1997-10-17T01:30:00 * Date/Time End: 1997-10-24T02:00:00
Minimum DEPTH, sediment/rock: 0.00 m * Maximum DEPTH, sediment/rock: 62.19 m
CRP-1 (16 km ENE Cape Roberts) * Latitude: -77.007580 * Longitude: 163.755080 * Date/Time Start: 1997-10-17T01:30:00 * Date/Time End: 1997-10-24T02:00:00 * Elevation: -153.5 m * Penetration: 132.06 m * Recovery: 113.32 m * Location: off Cape Roberts, Ross Sea, Antarctica * Campaign: CRP-1 * Basis: Sampling/drilling ice * Device: Core wireline system (CWS) * Comment: sea ice thickness: 1.60 m, recovery 86 %. Age and lithology of oldest strata: 22-24 Ma; mudstone with scattered pebbles.
McMurdo_Sound * Latitude: -77.000000 * Longitude: 163.750000 * Campaign: CRP-1 * Basis: Sampling/drilling ice * Device: Outcrop sample (OUTCROP)
Wright_Valley * Latitude: -77.166667 * Longitude: 161.833333 * Location: McMurdo Sound * Campaign: CRP-1 * Basis: Sampling/drilling ice * Device: Outcrop sample (OUTCROP)
|#||Name||Short Name||Unit||Principal Investigator||Method||Comment|
|2||Latitude of event||Latitude|
|3||Longitude of event||Longitude|
|6||Sample comment||Sample comment||Taviani, Marco|
|7||δ18O, skeletal carbonate||δ18O skel carb||‰ PDB||Taviani, Marco||Mass spectrometer Finnigan MAT 252|
|8||δ18O, standard deviation||δ18O std dev||±||Taviani, Marco||Mass spectrometer Finnigan MAT 252|
|9||δ13C, skeletal carbonate||δ13C skel carb||‰ PDB||Taviani, Marco||Mass spectrometer Finnigan MAT 252|
|10||δ13C, standard deviation||δ13C std dev||±||Taviani, Marco||Mass spectrometer Finnigan MAT 252|
48 data points