Citation:

epic.28273.d001

Name: (Table 1) Facies characteristics and their interpretations of sediment cores CRP-2/2A
Published: 2000
License: https://creativecommons.org/licenses/by/3.0/

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Project(s):

Cape Roberts Project (CRP)

Coverage:

Latitude: -77.005980 * Longitude: 163.719450

Date/Time Start: 1998-10-16T07:30:00 * Date/Time End: 1998-11-25T14:20:00

Minimum ORDINAL NUMBER: 1 * Maximum ORDINAL NUMBER: 12

Event(s):

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: * Basis: Sampling/drilling from ice * Method/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)

Comment:

Ordinal number = facies number

Parameter(s):

#	Name	Short Name	Principal Investigator	Comment
1	ORDINAL NUMBER	Ord No		Geocode
2	Facies name/code	Facies	Powell, Ross
3	Lithology/composition/facies	Lithology	Powell, Ross
4	Lithology/composition/facies	Lithology	Powell, Ross	continued
5	Environment	Environment	Powell, Ross
6	Comment	Comment	Powell, Ross

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

51 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Ord No	2 Facies	3 Lithology	4 Lithology (continued)	5 Environment	6 Comment
1	Mudstone	massive, often sandy; local laminae; common lonestones; locally brecciated; marine marco- and microfossils		hemipelagic suspension settling, rainout from ice rafting, may be modified by other processes, brecciated by tectonism or glacial tectonism	fine-grained character, isolated clasts, marine fossils
2	Interstratified sandstone and mudstone	sandstones on sharp contacts, sandstones grade up , often to mudstones, massive and amalgamated beds, planar stratified, local ripple cross-lamination, some normal, local reverse grading, dispersed to abundant clasts, marine macro- and microfossils		range of marine processes: low- to moderate-density sediment gravity flow deposition; combined wave and current action, rapid deposition and resedimentation	sandstone/mudstone association, style of internal stratificaton and grading, marine fossils
3	Poorly sorted (muddy) very fine to coarse sandstone	various poorly sorted sandstones, locally massive and amalgamated, locally planar laminated and bedded, normal grading, local reverse, local ripple cross-lamination, local soft-sediment deformation, boudinage	local dispersed clasts grading to matrixsupported conglomerate, marine marco- and microfossils	medium- to high-density sediment gravity flow deposition very fine to fine sandstones may be from settling from turbid plumes with high sediment concentrations, may be massive due to depositional processes or mixing by bioturbation, freeze/thaw. Loading	style of internal stratification and grading, degree of sorting, marine fossils
4	oderately to well sorted, stratified fine sandstone	local low angle cross-bedding and crosslamination, locally planar, thin bedded t laminated, possible HCS, quartz rich, local coal laminae, locally with dark mudstone, bituminous	penecontemporaneous soft-sediment deformation, marine marco- and microfossils	dilute trational currents (with or about wave base to shoreface)	style of internal stratification , particle size and sorting, marine fossils
5	Moderately to well sorted, stratified or massive, fine to coarse sandstone	mostly medium-grained, locally fine or coarse, planar to cross-stratified, locally massive and amalgamated, dispersed to abundant clasts, local gravelly layers at base, weak to moderate bioturbation, marine fossils		marine currents/wave influence (perhaps shoreface), local erosion with hiatuses, rainout from iceberg rafting	particle size and sorting, style of internal stratification, bioturbation, marine fossils
6	Stratified diamictite	clast-rich to clast-poor, sandy or muddy, a-axes locally aligned with stratification outsized clasts, stratification by: mudstone, siltstone, very fine to very coarse sandstone laminae; change in mean size in matrix sand	varying proportions of mud, commonly grade with massive diamictite, commonly interbedded with conglomerates, diamictites, sandstones and mudstones, locally strong soft-sediment deformation, locally include marine macrofossils	amalgamated or single debris-flow deposition, rainout with currents, subglacial deposition	particle size and sorting, style of internal stratification and grading, style of contacts, associated facies, marine fossils
7	Massive diamictite	clast-rich to clast-poor, sandy or muddy, graded contacts with conglomerate, sandstone and mudstone, or lower contact sharp (loaded and deformed), rarely a axes apparent preferred subhorizontal orientation, locally include marine marcofossils and lapilli		subglacial deposition amalgamated or single debris flow deposition, rainout with currents	particle size and sorting, style of contacts, associated facies, marine fossils
8	Rhythmically interstratified sandstone and siltstone	very fine sandstone sharply interstratified with discrete siltstone laminae, Ionestones, dropstones and outsized clasts, often with Facies 2, 6 and 7		suspension settling from turbid plumes, may include low density turbidity current deposition	one-grain-thick lamina style of cyclopels and cyclopsams, graded style of turbidites
9	Clast-supported conglomerate	massive, poorly sorted, locally graded, no clast orientation, some clasts angular, sharp lower contacts, gradational up into matrix supported conglomerate to sandstone		settling from submarine jet from subglacial streams, fluvial/shallow marine deposition, may include rainout from ice-rafted debris	clast-support style, clast features, style of contacts
10	Matrix-supported conglomerate	massive, very poorly sorted, angular clasts quite common, gradational into clast-supported conglomerate or sandstone		high-density mass flow deposit, hyperconcentrated flows from submarine jet of subglacial stream, very local mass flow redeposition of fluvial sediment, suspension settling and rainout	clast-support style, clast features, particale sorting, style of contacts
11	Mudstone breccia	massive, intraclasts of mudstone , angular to subrounded, clast-supported, within soft-sediment deformed sequences		mass flow deposition	clast features, clast-support style, facies sequence
12	Non-welded lapillistone	pumiceous lapillistone, massive and laminated fine and medium sandstone with dispersed ash and lapilli, dark volcanic ash laminae		air-fall through water, reworked by marine currents and sediment gravity flows	particle size and composition, internal stratification