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Polozek, Kerstin; Ehrmann, Werner (1998): Mineral assemblage of basement clasts of sediment core CRP-1. PANGAEA,, Supplement to: Polozek, K; Ehrmann, W (1998): Distribution of heavy minerals in CRP-1. Terra Antartica, 5(3), 633-638, hdl:10013/epic.28347.d001

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Heavy minerals from the lower Miocene and Quaternary sediments of the CRP-1 drillcore have been investigated in order to characterise the mineralogical composition of the sediments and to reconstruct their source areas. The sediments are dominated by very high concentrations of pyroxenes. Hornblende, stable heavy minerals (zircon, garnet, epidote. titanite and apatite), opaque and altered minerals are quantitatively minor. The downcore distribution of the pyroxenes indicates 5 cycles. Each cycle starts with diamictites and proximal glacimarine sediments containing maximum concentrations of pyroxenes of up to 80% in the heavy mineral fraction, and grades into distal glacimarine sediments, with a lower pyroxene content. The heavy minerals indicate a mixed source for all CRP-1 sediments. The proximal sediments consist mainly of minerals derived from a crystalline basement and clastic sedimentary rocks, such as are widespread in the Transantarctic Mountains. However, they also contain a minor component derived from volcanic rocks. The distal sediments, in contrast, are dominated by a volcanic source, which was probably situated to the south of the drillsite, in the region of the present-day Ross Ice Shelf.
Related to:
Polozek, Kerstin (2001): Die Schwermineralverteilung känozoischer Sedimente des McMurdo-Sunds, Ross-Meer, Antarktis: Rekonstruktion von Liefergebieten und Eisschildfluktuationen. PhD Thesis, Leipzig University, Leipzig, 120 pp, hdl:10013/epic.32120.d001
Latitude: -77.007580 * Longitude: 163.755080
Date/Time Start: 1997-10-17T01:30:00 * Date/Time End: 1997-10-24T02:00:00
Minimum DEPTH, sediment/rock: 24.85 m * Maximum DEPTH, sediment/rock: 146.52 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 * Method/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.
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, sediment/rockDepth sedmGeocode
2PyroxenePyrox%Ehrmann, WernerHeavy mineral analysis
3PyroxenePyrox%Ehrmann, WernerHeavy mineral analysisTrans Antarctic Mountain pyroxene with cleavage
4PyroxenePyrox%Ehrmann, WernerHeavy mineral analysisMcMurdo vulcanic group, pyroxene without cleavage
5AmphiboleAmp%Ehrmann, WernerHeavy mineral analysis
6Hornblende, brownHbl brown%Ehrmann, WernerHeavy mineral analysis
7Minerals, stableMinerals stable%Ehrmann, WernerHeavy mineral analysis
8Opaque mineralsOpaque%Ehrmann, WernerHeavy mineral analysis
9Volcanic glassVolc glass%Ehrmann, WernerHeavy mineral analysis
10TitanaugiteTi-Aug%Ehrmann, WernerHeavy mineral analysis
241 data points

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