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Passchier, Sandra; Wilson, Terry; Paulsen, Timothy S (1998): Characterisation of breccias in sediment core CRP-1 (Table 1). PANGAEA,, Supplement to: Passchier, S et al. (1998): Origin of breccias in the CRP-1 core. Terra Antartica, 5(3), 401-409, hdl:10013/epic.28315.d001

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CoreScan images were examined to determine the origin of breccias in the CRP-1 core. Breccias occur throughout the core. but are dominant deformation features in the upper 85 m. Breccia textures, boundaries and texture arrangements suggest that in situ fracturing and horizontal planar shearing are important deformation mechanisms in the upper part of the Miocene section. Forceful injections of silt and clay into fractures point to dewatering of overpressurised sediment. Breccias located below 55 metres below the sea floor (mbsf) occur associated with soft-sediment deformation, which is absent in younger intervals of the core. Deformation styles interpreted from the breccia textures, their downcore distribution, and the relations of breccias with sequence boundaries and lithologies, such as diamictites and graded beds, suggest brecciation occurred as a result of subglacial shearing and mass-movement processes. These mechanisms were also proposed for breccias and soft sediment deformation features observed in other McMurdo Sound cores. Subglacial shearing was a possible cause for the development of two thick brecciated intervals at ~44 and at ~79 mbsf, whereas slope failure and redeposition was probably the cause of brecciation below ~85 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: 41.070 m * Maximum DEPTH, sediment/rock: 147.395 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
2Depth, top/minDepth topmPasschier, Sandra
3Depth, bottom/maxDepth botmPasschier, Sandra
4Lithology/composition/faciesLithologyPasschier, SandraVisual description
5TextureTexturePasschier, SandraVisual description
6Boundary descriptionBound descrPasschier, SandraVisual description
7Deformation structure, typeDeformationPasschier, SandraVisual description
8DescriptionDescriptionPasschier, SandraVisual descriptionsediment-filled cracks
9DescriptionDescriptionPasschier, SandraVisual descriptionassociated with breccia
10InterpretationInterpretationPasschier, SandraVisual description
81 data points

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