Lithology description, textural and structural observations, and indications for ground ice of sediment core CRP-2 (Table 1-4)

• Main Author: van der Meer, Jaap
• Format: Dataset
• Language: English
• Published: PANGAEA 2000
• Subjects: 14.2 km at 096° true from Cape Roberts; Cape Roberts Project; Clast shape; Core wireline system; CRP; CRP-2; CRP-2A; CWS; Depth; bottom/max; sediment/rock; top/min; Diagenesis; Distribution; Event label; Fabric; Interpretation; Lithologic unit/sequence; Lithology/composition/facies; off Cape Roberts; Ross Sea; Antarctica; Sample code/label; Sampling/drilling from ice; Sequence identifier; Size; Structure; Cape Roberts; Roberts Cape; Antarc*
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.451856; https://doi.org/10.1594/PANGAEA.451856

From the upper 300 m of CRP-2/2A, twenty-six samples of diamicts and deformation structures have been thin sectioned. These have been analysed for texture, structure, diagenesis and plasmic fabric. The combination of certain microstructures (e.g. turbate and linear) and plasmic fabric development is indicative of grounded ice. Clear evidence for two grounded ice events (three samples) was found in the upper Oligocene part of the core. The interpretation of ten more samples is less certain, but as for CRP-1, is taken to point to grounded ice as well. There is a strong correlation between these indications for grounded ice and the basal part of cycles in the sequence stratigraphy.