Unknown
PANGAEA
In:
Supplement to: Dadey, Kathleen A (1989): Investigation of sediment microstructure at Sites 646 and 647, Ocean Drilling Program Leg 105. In: Srivastava, SP; Arthur, M; Clement, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 105, 797-809, https://doi.org/10.2973/odp.proc.sr.105.144.1989
Publication Date:
2024-01-09
Description:
Possible genetic relationships between syn- and post-depositional processes and sediment microstructure were investigated. Samples from cores at Sites 646 and 647 of Ocean Drilling Program (ODP) Leg 105 included examples of bottom current deposition (contourites), turbidity current deposition, consolidation, and diagenesis.
Examination of nearly 200 micrographs of 14 samples from Site 646 and 13 samples from Site 647 leads to the conclusion that sedimentation processes do not appear to have an obvious influence on fabric. The effects of post-depositional processes, such as bioturbation, coring disturbance, and even remolding, appear to be less significant than one might expect as a result of the relatively coarse grain size of the sediments studied.
Consolidation resulting from increased overburden stress results in increased particle alignment and compression of fabric elements with depth. The transition from open, random fabric in shallow samples to preferred orientation at depth represents the only change in these sediments that can be ascribed directly to a specific depositional or post-depositional process. Mineralogical variations, owing to changes in weathering processes and growth of authigenic/diagenetic minerals, also have a pronounced effect on sediment fabric.
Keywords:
105-646A; 105-646B; 105-647A; 105-647B; DRILL; Drilling/drill rig; Joides Resolution; Labrador Sea; Leg105; Ocean Drilling Program; ODP; South Atlantic Ocean
Type:
Dataset
Format:
application/zip, 2 datasets
Permalink
|
Location |
Call Number |
Expected |
Availability |
