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Neumann, M; Ehrmann, Werner (1999): Semiquantitative occurence of various minerals in sediment core CRP-2A. PANGAEA,, Supplement to: Neumann, M; Ehrmann, W (2000): Mineralogy of sediments from CRP-2/2A, Victoria Land Basin, Antarctica as revealed by x-ray diffraction. Terra Antartica, 7(4), 575-580, hdl:10013/epic.28294.d001

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The mineralogy of the lower Oligocene to Quaternary sediments of core CRP-2/2A drilled on the continental shelf of McMurdo Sound in Ross Sea, Antarctica, was examined by the X-ray diffraction method. Quartz, plagioclase feldspar and K-feldspar are the most important non-clay minerals. Pyroxene and amphibole occur in minor amounts throughout the core. The composition of the sediments points to an origin in the Transantarctic Mountains for the majority of the detrital components. There, the plutonic and metamorphic rocks of the basement, the sediments of the Beacon Supergroup and the volcanic rocks of the Ferrar Group could serve as possible source lithologies. The distribution of the detrital minerals reflects a long-term history of successive erosion and valley incision. During the deposition of the lower part of the core, the detrital minerals were probably mainly derived from the sediments of the Beacon Supergroup, as indicated by the high quartz but relatively low feldspar abundances. In the upper c. 350 m of the core, the influence of a source in the basement became stronger and results in lower quartz contents but increasing abundance of feldspar. Some diagenetic alteration of the sediments is indicated by the occurrence of zeolites below c. 320 mbsf and of opal-CT above c. 320 mbsf.
Latitude: -77.005980 * Longitude: 163.719450
Date/Time Start: 1998-10-16T07:30:00 * Date/Time End: 1998-11-25T14:20:00
Minimum DEPTH, sediment/rock: 7.11 m * Maximum DEPTH, sediment/rock: 623.81 m
CRP-2A (14.2 km at 096° true from Cape Roberts) * Latitude: -77.005980 * Longitude: 163.719450 * Date/Time Start: 1998-10-16T07:30:00 * Date/Time End: 1998-11-25T14:20:00 * Elevation: -177.9 m * Recovery: 624 m * Location: off Cape Roberts, Ross Sea, Antarctica * Campaign: CRP-2 * Basis: Sampling/drilling from ice * Device: Core wireline system (CWS) * Comment: 921 m at 284° from CRP-1. Sea-ice thickness: 2.0 m (1 Oct) to 2.2 m (23 Nov). Sea riser embedded to 13.03 mbsf. Lateral ice movement: 9.87 m to east from 17 Oct to 23 Nov. HQ core to 199.31 mbsf. NQ core to 624.15 mbsf. 13.03 to 45.97 mbsf, 11.29 m (34%) partially following CRP-2. 45.07 to 624.15 mbsf, 548.67 m (95%) new hole. Deepest core-lithology: hard sandy siltstone. Deepest core-age: earliest Oligocene (ca. 33 Ma on diatoms, nannofossils and dinoflagellates)
#NameShort NameUnitPrincipal InvestigatorMethodComment
1DEPTH, sediment/rockDepthmGeocode
2SandSand%Ehrmann, WernerGrain size, sieving/settling tube
3Quartz/standard ratioQz/stdEhrmann, WernerX-ray diffraction (XRD)intensity ratio, quartz at 4.26Å
4Feldspar/standard ratioFsp/stdEhrmann, WernerX-ray diffraction (XRD)ratio peak area/double left peak area
5Feldspar 3.24 Å (Kalifeldspar)/standard ratioKfs 3.24 Å/stdEhrmann, WernerX-ray diffraction (XRD)intensity ratio
6Feldspar 3.18 Å (Plagioclase)/standard ratioPl 3.18 Å/stdEhrmann, WernerX-ray diffraction (XRD)intensity ratio
7Kalifeldspar/Plagioclase ratioKfs/PlEhrmann, WernerX-ray diffraction (XRD)intensity ratio
8Quartz/Feldspar ratioQz/FspEhrmann, WernerX-ray diffraction (XRD)peak area ratio, quartz at 4.26Å
9Pyroxene/standard ratioPyrox/stdEhrmann, WernerX-ray diffraction (XRD)ratio peak area/double left peak area
10Amphibole/standard ratioAmp/stdEhrmann, WernerX-ray diffraction (XRD)ratio peak area/double left peak area
11Zeolite/standard ratioZeo/stdEhrmann, WernerX-ray diffraction (XRD)intensity ratio
12Opal-CT/standard ratioOpal-CT/stdEhrmann, WernerX-ray diffraction (XRD)intensity ratio
797 data points

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