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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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Abstract:
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.
Project(s):
Coverage:
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
Event(s):
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)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEvent
2Latitude of eventLatitude
3Longitude of eventLongitude
4DEPTH, sediment/rockDepthmGeocode
5EpochEpochTaviani, Marco
6Sample commentSample commentTaviani, Marco
7δ18O, skeletal carbonateδ18O skel carb‰ PDBTaviani, MarcoMass spectrometer Finnigan MAT 252
8δ18O, standard deviationδ18O std dev±Taviani, MarcoMass spectrometer Finnigan MAT 252
9δ13C, skeletal carbonateδ13C skel carb‰ PDBTaviani, MarcoMass spectrometer Finnigan MAT 252
10δ13C, standard deviationδ13C std dev±Taviani, MarcoMass spectrometer Finnigan MAT 252
Size:
48 data points

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