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Smellie, John L (1998): (Table 1) Detrital modes for sand grains in sediment core CRP-1. PANGAEA,, Supplement to: Smellie, JL (1998): Sand grain detrital modes in CRP-1: provenance variations and influence of Miocene eruptions on the marine record in the McMurdo Sound region. Terra Antartica, 5(3), 579-587, hdl:10013/epic.28306.d001

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Detrital modes for the sand-size fraction in 24 samples from the CRP-1 drillcore are described. Most samples are largely composed of quartzo-feldspathic detritus sourced dominantly from Palaeozoic granitoids and quartzose sedimentary sequences. Minor contributions from basic lamprophyre dykes, felsic dykes and possibly Kirkpatrick basalts are also identified as detrital components for the first time. The provenance also included a minor outcrop area of high-grade metamorphic rocks. Detritus derived from a Ferrar dolerite source is common throughout. It was possibly derived mainly from thick sills of the lower coastal ranges (intruding Palaeozoic and older "basement") rather than those sills intruding the stratigraphically higher Beacon sedimentary sequence, although this suggestion is not strongly constrained. Tephra particles from both magmatic and hydrovolcanic eruptions are well represented and persistent at all levels in the core, although no primary tephra layers are present. The volcanic influence is minor in most of the Quaternary samples analysed (although these are few) and most Miocene samples. Conversely, the topmost part of the Miocene sequence (above 62 metres below sea floor (mbsf)) is strongly affected by volcanism, with two major basic-intermediate eruptions represented in the detrital record (at c. 61 and 45 mbsf) and provisionally correlated with a volcano formerly situated near Mount Morning. A third eruption of evolved pumice is also recorded in the Miocene sequence at c. 116 mbsf.
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: 24.53 m * Maximum DEPTH, sediment/rock: 138.52 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 * 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 InvestigatorMethodComment
1DEPTH, sediment/rockDepthmGeocode
2Lithology/composition/faciesLithologySmellie, John LCoarse fraction/modal analysismean grain size
3Quartz, angularQz ang%Smellie, John LCoarse fraction/modal analysis
4Quartz, roundedQz round%Smellie, John LCoarse fraction/modal analysis
5QuartzQz%Smellie, John LCoarse fraction/modal analysis
6PlagioclasePl%Smellie, John LCoarse fraction/modal analysis
7KalifeldsparKfs%Smellie, John LCoarse fraction/modal analysis
8FeldsparFsp%Smellie, John LCoarse fraction/modal analysis
9PyroxenePyrox%Smellie, John LCoarse fraction/modal analysisIncludes Ti-augite, deep green cpx, opx, pigeonite
10AmphiboleAmp%Smellie, John LCoarse fraction/modal analysisIncludes rare sodic amphibole
11BiotiteBt%Smellie, John LCoarse fraction/modal analysisMainly brown, rare green
12MuscoviteMs%Smellie, John LCoarse fraction/modal analysis
13MicaMica%Smellie, John LCoarse fraction/modal analysis
14Quartz, polycrystallinePolyQz%Smellie, John LCoarse fraction/modal analysis
15Sedimentary rockSedim rock%Smellie, John LCoarse fraction/modal analysis
16VolcaniteVolcanite%Smellie, John LCoarse fraction/modal analysisLvMVGbasic, McMurdo vulcanic group, basic
17VolcaniteVolcanite%Smellie, John LCoarse fraction/modal analysisLvMVGevol, McMurdo vulcanic group
18VolcaniteVolcanite%Smellie, John LCoarse fraction/modal analysis
19MetamorphiteMetam%Smellie, John LCoarse fraction/modal analysis
20Rock fragmentsRock fragm%Smellie, John LCoarse fraction/modal analysis
21Volcanic glass, brownVolc glass brown%Smellie, John LCoarse fraction/modal analysis
22Volcanic glass, clearVolc glass clear%Smellie, John LCoarse fraction/modal analysis
23Volcanic glassVolc glass%Smellie, John LCoarse fraction/modal analysis
24Components indeterminataComp indet%Smellie, John LCoarse fraction/modal analysisIncludes garnet, epidote, opaque oxide, ?aenigmatite, ?glauconite, olivine, zircon, sphene, bioclastic debris (siliceous and carbonate)
25MatrixMatrix%Smellie, John LCoarse fraction/modal analysisCalculated as % of the total count, excluded from other values in the table
574 data points

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