Powell, Ross; Hambrey, Mike J; Krissek, Lawrence A (1998): Description of lithofacies associations and their interpreted settings from sequences of sediment core CRP-1 (Table 2) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.433089, Supplement to: Powell, R et al. (1998): Quaternary and Miocene glacial and climatic history of the Cape Roberts drillsite region, Antarctica. Terra Antartica, 5(3), 341-351, hdl:10013/epic.28313.d001
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Abstract:
Cape Roberts Project drillcore 1 was obtained from Roberts Ridge, a sea-floor high located at 77°S, 16 km offshore from Cape Roberts in western McMurdo Sound, Antarctica. The recovered core is about 147 m long with the upper 43.15 metres below the sea floor (revised figure) being dated as Quarternary and the older part of the sequence being Miocene. The core includes nine facies: sandy diamict, muddy diamict, gravel/conglomerate, mud(stone), clay(stone) and carbonate. These facies occure in associations that are repeated in particulare sequences throughout the core, and are interpreted as representing different depositional environments through time. Seven lithofacies associations are interpreted as representing offshore shelf, ice protected/below wave-base; prodeltaic/offshore shelf; delta front/sandy shelf; ice system; subglacial till/rainout diamict/debris flow diamicts singly or in combination; and a carbonate-rich shelf bank. The facies associations are used to infer that the Quaternary section represents deposition on a polar shelf with perhaps two or three glacial fluctuations. The Quaternary carbonate unit indicates a period of ice sheet retreat, but local glacial activity may have increased with an increase in costal precipitation. The Miocene section represents polythermal glacial systems. The older Miocene section is glacially dominated whereas the younger section is much less so. The glacially dominated section may provide evidence for a major glacial advance thar resulted un a low stand of global eustatic sea level at that time. After the low stand, eustatic sea level was gradually rising during deposition of the younger section dominated more by non-glacial processes.
Project(s):
Cape Roberts Project (CRP)
Coverage:
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: 20.565 m * Maximum DEPTH, sediment/rock: 148.595 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 * 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.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | Depth, top/min | Depth top | m | Powell, Ross | ||
| 3 | Depth, bottom/max | Depth bot | m | Powell, Ross | ||
| 4 | Facies name/code | Facies | Powell, Ross | |||
| 5 | Lithology/composition/facies | Lithology | Powell, Ross | |||
| 6 | Environment | Environment | Powell, Ross |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
157 data points
Data
| 1 Depth sed [m] | 2 Depth top [m] | 3 Depth bot [m] | 4 Facies | 5 Lithology | 6 Environment |
|---|---|---|---|---|---|
| 20.565 | 19.13 | 22.00 | Sandy diamicts (Structureless diamict) | Rainout (?and subglacial), ice contact and ice proximal | Glacial shelf deposition, rainout/(?) subglacial |
| 23.275 | 22.00 | 24.55 | No core | ||
| 24.815 | 24.55 | 25.08 | Sandy diamicts (Rainout diamict graded up from sandy mud below) | Rainout , ice contact and ice proximal | Glacial shelf deposition |
| 25.755 | 25.08 | 26.43 | Muds (Suspension deposited mud, ?drilling disturbed?) | Offshore shelf, ice protected/below wave-base, paraglacial | |
| 27.960 | 26.43 | 29.49 | Graded sands (Marine current-deposited sands and sandy turbidites) | Delta front/sandy shelf, below wave-base, non-glacial(?) | Glacial shelf deposition during glacial retreat |
| 30.690 | 29.49 | 31.89 | Sandy diamicts+graded sands (Sharp and graded contacts, diamict-diamict, diamict-sand | Ice-contact, ice proximal mass flow, and rainout systems | Glacial shelf deposition at and near grounding-line |
| 32.855 | 31.89 | 33.82 | Fossiliferous siliciclastics+calcareous sandy mud+muds+sandy diamicts+graded sands (Coquina, calcareous mud, diamict, diamict-sand) | Carbonate shelf | Deposition on shelf bank with some influence of iceberg rafting |
| 38.685 | 33.82 | 43.55 | Sandy diamicts+muds+gravels (Diamicts with graded contacts within and with muds, Ionestone horizons) | Rainout with local subglacial (?), ice contact and ice proximal | Glacial shelf deposition, (?) minor glacial fluctuation, (?) more distal upward |
| 46.890 | 43.55 | 50.23 | Stratified sands+graded sands (Marine current-deposited sands and sandy turbidites) | Delta front/sandy shelf, below wave-base/(?) ice protected, non-glacial/(?)paraglacial | |
| 51.965 | 50.23 | 53.70 | Muds (Suspension settling deposits) | Poorly constrained. Offshore shelf, below wave-base, non-glacial(?) | Offshore sedimentation in general coarsening-up progradation during glacial retreat phase |
| 54.775 | 53.70 | 55.85 | Graded sands+sandy diamicts+muds (Sandy turbidites, debris flow diamicts, traction sands, cyclo-pels, Ionestone layers) | Ice contact and ice proximal mass flow and submarine fluvial efflux system | Ice contact grounding-line fan system |
| 57.825 | 55.85 | 59.80 | Muds+breccias+graded sands (Suspension settling deposits and very low density gravity flow deposits) | Prodeltaic/offshore shelf, below wave-base, non-glacial | Offshore sedimentation in glacial retreat phase |
| 60.685 | 59.80 | 61.57 | Graded sands+muds+gravels (Stacked sandy turbidites, rare debris flow diamicts, Ionestones) | Ice-contact and ice proximal mass flow and submarine fluvial efflux system | |
| 62.385 | 61.57 | 63.20 | Sandy diamicts+graded sands+gravels (Debris flow diamicts, subglacial till, rare sandy turbidites) | Ice-contact and ice proximal mass flow system, some sub-glacial deposition(?) | Ice contact morainal bank and probank and grounding-line fan system |
| 66.355 | 63.20 | 69.51 | Graded sands+stratified sands+muds (Sandy turbidites and marine current-deposited (+aeolian mix?) sands) | Delta front/sandy shelf, non-glacial | |
| 69.895 | 69.51 | 70.28 | Muds+clays+breccias (Suspension settling deposits and very low density gravity flow deposits) | Offshore shelf (?prodelta), ice protected/below wave-base, paraglacial/(?)non-glacial | |
| 72.965 | 70.28 | 75.65 | Graded sands+stratified sands+muds (Gravity flow and traction (+aeolian mix?) deposits with rare Ionestones) | Delta front/sandy shelf, ice-protected/below wave-base, paraglacial | Shelf progradation with glacial influence in last stages, then glacial retreat with continued shelf |
| 77.175 | 75.65 | 78.70 | Clays+muds (Suspension setting deposits with rare lonestones) | Offshore shelf, ice protected/below wave-base, paraglacial | |
| 79.930 | 78.70 | 81.16 | Sandy diamicts+graded sands+gravels+breccias (Debris flow diamicts and (?)subglacial till) | Ice contact and ice proximal mass flow and submarine fluvial efflux system, (?)sub-glacial, reworked lags and redeposited flows | Ice contact grounding-line fan and morainal bank and then glacial over-riding; final stage - shallow water reworking |
| 81.765 | 81.16 | 82.37 | Muds (Suspension settling deposits with rare Ionestones) | Offshore shelf, ice protected/below wave-base, paraglacial | |
| 83.215 | 82.37 | 84.06 | Graded sands+muds+stratified sands(+B) (Gravity flow and traction deposits with rare Ionestones) | Delta front/sandy shelf, paraglacial | |
| 84.955 | 84.06 | 85.85 | Muds (Suspension settling deposits with rare Ionestones) | Offshore shelf, ice protected/below wave-base, paraglacial | Nearshore to off-shore paraglacial delta/shelf - two cycles |
| 89.020 | 85.85 | 92.19 | Graded sands+stratified sands (Gravity flow and traction deposits with rare Ionestones) | Delta front/sandy shelf, paraglacial | |
| 97.305 | 92.19 | 102.42 | Muds+graded sands (Suspension settling deposits with clasts as Ionestones and in horizons, low density gravity flow deposits) | Prodeltaic/offshore shelf, medial glacimarine to paraglacial | Medial glacimarine with glacial retreat and then shoreline progradation at start of sequence above |
| 102.915 | 102.42 | 103.41 | Graded sands+muds (Stacked low density gravity flow deposits, Ionestones) | Delta front/sandy shelf, glacial | |
| 106.085 | 103.41 | 108.76 | Sandy diamicts+graded sands (Debris flow diamicts and (?)subglacial till) | Ice contact and ice proximal mass flow system | Grounding-line fan, then morainal bank and pro-bank and then delta |
| 109.380 | 108.38 | 110.38 | Graded sands+muds (Stacked sandy turbidites, Ionestones and dropstones, cyclopels and cyclopsams) | Ice contact and ice proximal mass flow and submarine fluvial efflux system | |
| 112.240 | 110.38 | 114.10 | Graded sands+stratified sands+muds (Sandy turbidites and marine current-depo-sited sands, suspension settling deposits) | Delta front/prodelta/shelf, below wave base, non-glacial | Nearshore to offshore non-glacial delta/shelf - two cycles |
| 116.690 | 114.10 | 119.28 | Graded sands+sandy diamicts+muds (Stacked debris flow diamicts, sandy turbidites, ice-rafted debris as lonestones and pavements, soft sediment deformation and fluid escape) | Ice contact and ice proximal mass flow and submarine fluvial efflux system | |
| 126.965 | 119.28 | 134.65 | muddy diamicts+sandy diamicts+graded sands+muds (Debris flow diamicts with thin low density gravity flow deposits, graded/amalgamated contacts, soft sediment deformation) | Ice-contact and ice proximal mass flow system | Ice contact morainal bank and probank then grounding-line fan or delta |
| 137.875 | 134.65 | 141.10 | muddy diamicts (Structureless diamict - till or rainout) | Subglacial or rainout, ice contact and ice proximal | |
| 141.725 | 141.10 | 142.35 | Graded sands+muds (Sandy turbidites, suspension settling deposits) | Prodeltaic/offshore shelf, medial glacimarine | |
| 144.445 | 142.35 | 146.54 | Clays+muds (Suspension setting deposits with rare clasts as lonestones, low density gravity flow deposits) | Offshore shelf, ice protected/below wave-base, paraglacial | |
| 146.865 | 146.54 | 147.19 | Muds+clays+graded sands (Suspension setting deposits, low density gravity flow deposits) | Prodeltaic/offshore shelf, distal glacimarine | Deltaic/shelf below wave base, from medial to distal glacimarine to paraglacial/(?) nonglacial to medial glacimarine upward, showing glacial retreat then advance |
| 148.595 | 147.19 | 150.00 | Graded sands (Sandy turbidites) down to end of core | Delta front/sandy, medial glacimarine |