Passchier, Sandra (2000): Prominent deformation features and interpretation of sediment core CRP-2/2A (Table 1) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.144477, Supplement to: Passchier, S (2000): Soft-sediment deformation features in core from CRP-2/2A, Victoria Land Basin, Antarctica. Terra Antartica, 7(3), 401-412, hdl:10013/epic.28263.d001
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Abstract:
Sediment deformation features in CRP-2/2A were described during normal logging procedures and from core-scan images. In this paper the origin of soft-sediment folding, contorted bedding, microfaulting, clastic dykes, shear zones and intraformational breccias is discussed. The features have a stratigraphic distribution related to major unconformities and sequence boundaries. Hypotheses for the origins of sediment deformation include hydrofracturing, subglacial shearing, slumping, and gas hydrate formation. Shear zones, microfaults, clastic dykes and contorted bedding within rapidly deposited sediments, suggest that slumping in an ice-distal environment occurred in the early Oligocene. A till wedge beneath a diamictite at 364 mbsf the mid-Oligocene section represents the oldest evidence of grounded ice in CRP-2/2A. Shear zones with a subglacial origin in the early late Oligocene and early Miocene sections of the core are evidence of further grounding events. The interpretation of sediment deformation in CRP-2/2A is compared to other Antarctic stratigraphic records and global eustatic change between the late Eocenel/early Oligocene and the middle Miocene.
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 Elevation: -177.9 m * Maximum Elevation: -177.9 m
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: CRP-2 * 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)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Depth, top/min | Depth top | m | Passchier, Sandra | ||
| 2 | Depth, bottom/max | Depth bot | m | Passchier, Sandra | ||
| 3 | Deformation structure, type | Deformation | Passchier, Sandra | |||
| 4 | Facies name/code | Facies | Passchier, Sandra | Facies association | ||
| 5 | Geology, comment | Geo comm | Passchier, Sandra | Interpretation |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
218 data points
Data
| 1 Depth top [m] | 2 Depth bot [m] | 3 Deformation | 4 Facies | 5 Geo comm |
|---|---|---|---|---|
| 12.00 | 16.00 | crackle breccia ? | bottom of diamictite | ? |
| 44.91 | 47.87 | chaotic breccias, cataclastic, thrusts | above diamictite | proglacial ice-push |
| 50.00 | 71.00 | breccias, cataclastic shaer zones | below diamictite | subglacial shaer |
| 90.67 | 92.86 | soft-sediment deformarmation | below diamictite | subglacial shaer? |
| 93.85 | 98.64 | crackle breccia | between diamictites | in situ fracturing |
| 99.00 | folding | within diamictite | mass-gravity flow | |
| 131.00 | 132.00 | crackle breccia | below diamictite | in situ fracturing |
| 145.00 | 151.00 | brecciated sandstone dykes | top of clast-poor unit | hydrofracturing |
| 176.20 | 176.30 | microfaults, soft-sediment folding | within mudstone | ? |
| 183.35 | 185.95 | folds, rotated clasts | top of sandstone | mass-gravity flow |
| 245.00 | vertical fractures | below diamictite | ? | |
| 297.40 | clastic dyke through cemented patch | above diamictite | ? | |
| 297.00 | 306.00 | folds (D), faults and breccia (sst) | within diamictite | collapse? |
| 306.00 | intraclast, boudinage, clast rotation | bottom of diamictite | subglacial shaer | |
| 307.00 | fault with large displacement | below diamictite | ? | |
| 307.00 | 308.00 | rubble and crackle breccia | below diamictite | subglacial shaer |
| 311.00 | 315.00 | matrix-supported breccia | within clast-poor unit | collapse? |
| 315.00 | 326.00 | fault and clastic dykes | interbeddet lithologies | ? |
| 328.00 | clastic dyke, coarse stratified fill | below diamictite | subglacial shaer | |
| 329.00 | clastic dyke? | below diamictite | subglacial shaer | |
| 331.90 | matrix-supported breccia | within mudstone | mass-gravity flow | |
| 332.00 | clastic dyke, calcified and pyritized | within mudstone | ? | |
| 334.00 | clastic dyke, faulted | within mudstone | ? | |
| 337.00 | clastic dyke, faulted and faulted | within mudstone | ? | |
| 362.78 | 363.03 | shaer zone, folding, faulting | between diamictites | subglacial shaer |
| 363.22 | 363.63 | clastic wedge | between diamictites | subglacial shaer |
| 364.00 | clastic dyke | between diamictites | subglacial shaer | |
| 381.00 | 384.00 | microfaults, soft-sediment folding | stratified diamictite | mass-gravity flow |
| 447.00 | pyritized clastic dikes, planar margins | within mudstone | tectonic? | |
| 468.70 | fault cross-cuts calcite patch | within mudstone | tectonic? | |
| 501.00 | 503.00 | contorted bedding, folding | laminated sandstone | slumping |
| 504.00 | 506.00 | local mosaic breccias | interbedded lithologies | gas-hydratre formation? |
| 512.00 | 516.00 | contorted bedding, folding | gradet beds | slumping |
| 520.00 | 523.00 | clastic dykes, microfaulting | sandy conglomerate | debris flow |
| 524.00 | 527.00 | faults, pyritised clastic dykes | below congomerate | debris flow |
| 525.80 | mosaic breccia | above gradet beds | gas-hydratre formation? | |
| 535.00 | 540.00 | faulted clastic dykes | below congomerate | debris flow |
| 543.00 | 552.00 | faults, pyritised clastic dykes | within mudstone | tectonic? |
| 577.00 | 579.00 | contorted bedding, folding | interbedded lithologies | slumping |
| 579.02 | 580.99 | anastomosing networks | interbedded lithologies | slumping |
| 581.00 | 585.00 | contorted bedding, folding | above conglomerate | slumping |
| 587.00 | mosaic breccia | above gradet beds | gas-hydratre formation? | |
| 594.97 | 595.03 | mosaic breccia | below clast | gas-hydratre formation? |
| 608.70 | anastomosing dilated laminae | below straitfied sandst | slumping | |
| 608.00 | 608.14 | contorted bedding, folding | within sandstone | slumping |
| 612.00 | 612.07 | microfaulting cuts folding | above conglomerate | slumping |
| 614.00 | 614.20 | anastomosing dilated laminae | above conglomerate | slumping |