Citation:

epic.28328.d001

Name: Sample information and classification of lower Miocene gravity-flow types of sediment core CRP-1 (Table 1)
Published: 1998
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Nineteen samples of the Cape Roberts-1 drillcore were taken from Miocene- age deposits, from 90.25 – 146.50 metres below seafloor (mbsf) for thin section and laser grain-size analysis. Using the grain-size distribution, detailed core logging, X-radiography and thin-section analysis of microstructures, coupled with a statistical grouping of the grain-size data, three main styles of gravity-flow sedimentation were revealed. Thin (centimetre-scale) muddy debris-flow deposits are the most common and are possibly tirggered by debris rain-out from sea-ice These deposits are characterised by very poorly sorted, faintly laminated muddy sandstones with coarse granules toward their base. Contacts are gradational to sharp. Variations on this style of mass-wasting deposit are rhythmically stacked sequences of pebbly-coarse sandstones representing successive thin debris-flow events. These suggest very high sedimentation rates on an unstable slope in a shallow-water proximal glacimarine environment. Sandy-silty turbidites appear more common in the lower sections of the core, below approximately 141.00 mbsf, although they occur occasionally with the debris flow deposits The turbidites are characterised by inversely to normally graded, well-laminated siltstones with occasional lonestones, and represent a more distal shallow-water glacimarine environment.

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: 90.260 m * Maximum DEPTH, sediment/rock: 146.495 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: * 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	Comment
1	DEPTH, sediment/rock	Depth sed	m		Geocode
2	Depth, top/min	Depth top	m	Howe, John
3	Depth, bottom/max	Depth bot	m	Howe, John
4	Lithologic unit/sequence	Unit		Howe, John
5	Lithology/composition/facies	Lithology		Howe, John
6	Comment	Comment		Howe, John
7	Interpretation	Interpretation		Howe, John

License:

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

Size:

114 data points

Data

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

1 Depth sed [m]	2 Depth top [m]	3 Depth bot [m]	4 Unit	5 Lithology	6 Comment	7 Interpretation
90.260	90.25	90.27	Unit 5.7	Fining upwards sandtsone	loose	background
91.995	91.99	92.00	Unit 5.7	Fine sandtsone	loose	background
102.895	102.89	102.90	Unit 5.8	Weakly bedded well laminated sandtsone	loose	debrite
108.865	108.86	108.87	Unit 6.2	Stratified sandtsone	loose	turbidite
108.945	108.94	108.95	Unit 6.2	Stratified sandtsone	Oriented	turbidite
109.255	109.25	109.26	Unit 6.2	Fining upwards sandtsone	loose	debrite
109.315	109.31	109.32	Unit 6.2	Fining upwards sandtsone	loose	debrite
109.455	109.45	109.46	Unit 6.2	Fining upwards sandtsone	Oriented	debrite
109.655	109.65	109.66	Unit 6.2	Fining upwards sandtsone	Oriented	background
114.105	114.10	114.11	Unit 6.2	Massive silty-coarse sandtsone	loose	background
114.385	114.38	114.39	Unit 6.2	Massive silty-coarse sandtsone	loose	debrite
114.865	114.86	114.87	Unit 6.2	Fining upwards sandtsone	loose	debrite
115.035	115.03	115.04	Unit 6.2	Fining upwards sandtsone	loose	debrite
141.445	141.43	141.46	Unit 6.3	Clayey siltstone	Oriented	turbidite
141.455	141.45	141.46	Unit 6.3	Clayey siltstone	Oriented	turbidite
141.505	141.50	141.51	Unit 6.3	Clayey siltstone	Oriented	turbidite
144.825	144.82	144.83	Unit 7.1	Laminated siltstone	Oriented	turbidite
145.825	145.82	145.83	Unit 7.1	Massive claystone	Oriented	turbidite
146.495	146.49	146.50	Unit 7.1	Massive claystone	Oriented	turbidite