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Krissek, Lawrence A; Kyle, Philip R (2001): (Table 1) Major and trace elements of sediment core CRP-3 [dataset]. PANGAEA,, Supplement to: Krissek, LA; Kyle, PR (2001): Geochemical indicators of weathering, Cenozoic palaeoclimates and provenance in fine-grained sediments from CRP-3, Victoria Land Basin, Antarctica. Terra Antartica, 8(4), 561-568, hdl:10013/epic.28220.d001

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The CRP-3 core, drilled in western McMurdo Sound in October and November 1999, penetrated 823 m of lower Oligocene (to possibly upper Eocene) glacially influenced sediments. The palaeoclimatic record of CRP-3 is examined using major element analyses of bulk core samples of fine grained sediments (mudstones and siltstones) and the Chemical Index of Alteration (CIA) of Nesbitt & Young (1982, doi:10.1038/299715a0). The CIA is calculated from the molar abundances of Al, K, Ca, and Na oxides, and its magnitude increases as the effects of chemical weathering increase. However, changes in sediment provenance can also affect the CIA, so provenance changes have been evaluated by examining the Al2O3/TiO2 ratios and the Sr and Nb contents of the CRP-3 mudstones.
Relatively low Nb contents (<20 ppm) and relatively high Al2O3/TiO2 ratios (generally >15) indicate that little or no McMurdo Volcanic Group detritus was incorporated in these sediments. Instead, these sediments appear to be mixtures of Beacon Supergroup, Ferrar Dolerite, and basement (Granite Harbour Intrusives) components; increased Sr contents suggest that the importance of basement-derived material is greatest above ~200 metres below seafloor (mbsf), whereas Beacon Supergroup and/or Ferrar Dolerite components dominate below that level.
Below ~400 mbsf, the CIA profile is irregular and shows no correlation to the Al2O3/TiO2 record; as a result, the effects of weathering and provenance controls have not yet been interpreted for this part of the CIA profile. Above ~400 mbsf, however, four "cycles" of CIA increase/decrease (each spanning 50-100 m of stratigraphic thickness) are superimposed on a general decrease in CIA values upcore, and Al2O3/TiO2 ratios exhibit a matching pattern of "cycles". This correlation indicates that short-term provenance changes occurred during deposition of the upper half of CRP-3, and affected its CIA record. However, the Al2O3/TiO2 profile does not show any long-term trend above ~400 mbsf, so that the general decrease in CIA values above that level does not appear to be provenance-related. Instead, the general upcore decrease in the importance of chemical weathering above ~400 mbsf may record an episode of climatic deterioration prior to -31 Ma.
Latitude: -77.006000 * Longitude: 163.719000
Date/Time Start: 1999-10-09T00:00:00 * Date/Time End: 1999-11-19T00:00:00
Minimum DEPTH, sediment/rock: 22.23 m * Maximum DEPTH, sediment/rock: 788.87 m
CRP-3 * Latitude: -77.006000 * Longitude: 163.719000 * Date/Time Start: 1999-10-09T00:00:00 * Date/Time End: 1999-11-19T00:00:00 * Elevation: -295.0 m * Penetration: 939 m * Recovery: 936 m * Location: Ross Sea * Campaign: CRP-3 * Basis: Sampling/drilling from ice * Method/Device: Core wireline system (CWS) * Comment: 11.76 km at 76° true from Cape Roberts, 2.04 km at 225° true from CRP-2. Fast ice thickness: 2.0 to 2.2 m. Sea rise embedded to 9.55 mbsf. Lateral ice movement from spudding 5.0 m to 82° true. HQ core to 345.85 mbsf. NQ core to 939.42 mbsf. Core recovery 97%. Phase 1 logging to 345 mbsf, Phase 2 logging to 773 mbsf, Phase 3 logging to 918 mbsf. Deepest Cenozoic lithology and depth: sandstone breccia from 822.87 to 823.11 mbsf. Age of oldest Cenozoic strata: earliest Oligocene or latest Eocene. Deepest core lithology and depth: light red-brown quartz-cemented quartz sandstone to 939.42 mbsf. Age of bedrock: (mid?) Devonian.
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, sediment/rockDepth sedmGeocode
2Silicon dioxideSiO2%Krissek, Lawrence AX-ray fluorescence (XRF)
3Titanium dioxideTiO2%Krissek, Lawrence AX-ray fluorescence (XRF)
4Aluminium oxideAl2O3%Krissek, Lawrence AX-ray fluorescence (XRF)
5Iron oxide, Fe2O3Fe2O3%Krissek, Lawrence AX-ray fluorescence (XRF)
6Manganese oxideMnO%Krissek, Lawrence AX-ray fluorescence (XRF)
7Magnesium oxideMgO%Krissek, Lawrence AX-ray fluorescence (XRF)
8Calcium oxideCaO%Krissek, Lawrence AX-ray fluorescence (XRF)
9Sodium oxideNa2O%Krissek, Lawrence AX-ray fluorescence (XRF)
10Potassium oxideK2O%Krissek, Lawrence AX-ray fluorescence (XRF)
11Phosphorus pentoxideP2O5%Krissek, Lawrence AX-ray fluorescence (XRF)
12Loss on ignitionLOI%Krissek, Lawrence A
13Chemical index of alterationCIAKrissek, Lawrence A
14Aluminium/Titanium ratioAl/TiKrissek, Lawrence ACalculated
15Sulfur, totalTSmg/kgKrissek, Lawrence AX-ray fluorescence (XRF)
16ChlorideCl%Krissek, Lawrence AX-ray fluorescence (XRF)Original unit in ppm, converted to % by using the factor 1/10000
17VanadiumVmg/kgKrissek, Lawrence AX-ray fluorescence (XRF)
18ChromiumCrmg/kgKrissek, Lawrence AX-ray fluorescence (XRF)
19NickelNimg/kgKrissek, Lawrence AX-ray fluorescence (XRF)
20CopperCumg/kgKrissek, Lawrence AX-ray fluorescence (XRF)
21ZincZnmg/kgKrissek, Lawrence AX-ray fluorescence (XRF)
22GalliumGamg/kgKrissek, Lawrence AX-ray fluorescence (XRF)
23ArsenicAsmg/kgKrissek, Lawrence AX-ray fluorescence (XRF)
24RubidiumRbmg/kgKrissek, Lawrence AX-ray fluorescence (XRF)
25StrontiumSrmg/kgKrissek, Lawrence AX-ray fluorescence (XRF)
26YttriumYmg/kgKrissek, Lawrence AX-ray fluorescence (XRF)
27ZirconiumZrmg/kgKrissek, Lawrence AX-ray fluorescence (XRF)
28NiobiumNbmg/kgKrissek, Lawrence AX-ray fluorescence (XRF)
29MolybdenumMomg/kgKrissek, Lawrence AX-ray fluorescence (XRF)
30BariumBamg/kgKrissek, Lawrence AX-ray fluorescence (XRF)
31LeadPbmg/kgKrissek, Lawrence AX-ray fluorescence (XRF)
32ThoriumThmg/kgKrissek, Lawrence AX-ray fluorescence (XRF)
33UraniumUmg/kgKrissek, Lawrence AX-ray fluorescence (XRF)
2368 data points

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