Behrmann, Jan-Hinrich; Kopf, Achim J (1993): Texture analyses of ODP Site 131-808 sediments [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.785096, Supplement to: Behrmann, J-H; Kopf, AJ (1993): Textures and microfabrics in fine-grained muds and mudstones from Site 808, Nankai accretionary prism. In: Hill, IA; Taira, A; Firth, JV; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 131, 45-56, https://doi.org/10.2973/odp.proc.sr.131.106.1993
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Abstract:
The microfabric of 11 mudrock specimens from ODP Site 808 (Nankai accretionary prism) was quantitatively analyzed using X-ray texture goniometry and optical petrography. The objectives of the study were to learn about rock strain and to detect a component of bulk lateral shortening in the deformation of the mudstones. Strain evaluation is based on the predictions of March theory, and on distortions of initially homogeneous marker particle distributions (the Fry technique). The main results are as follows. The specimens underwent a strain path of progressive flattening, which is closely related to loss of pore space by vertical loading. A component of bulk lateral shortening is detectable in the top 550 mbsf at Site 808, but compared with the amount of uniaxial vertical shortening, its relative magnitude is probably small. Moreover, it cannot be said with confidence whether this is caused by toe contraction of the accretionary wedge or by gravitationally induced downslope movement of the sediment pile. The mudstones examined were deposited in a marine environment with an oxic bottom water column.
Micropore collapse is an important fabric building mechanism, but below 400 mbsf its effects are at least partly overridden by recrystallization of smectite. We conclude that mud microfabrics are not very precise deformation gauges, but can be used for rough estimations of strain.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 32.351933 * Median Longitude: 134.944000 * South-bound Latitude: 32.351400 * West-bound Longitude: 134.943600 * North-bound Latitude: 32.352800 * East-bound Longitude: 134.944400
Date/Time Start: 1990-04-04T22:30:00 * Date/Time End: 1990-05-02T14:40:00
Event(s):
131-808A * Latitude: 32.352000 * Longitude: 134.944400 * Date/Time Start: 1990-04-04T22:30:00 * Date/Time End: 1990-04-06T15:45:00 * Elevation: -4687.0 m * Penetration: 111.4 m * Recovery: 88.68 m * Location: Philippine Sea * Campaign: Leg131 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 13 cores; 111.4 m cored; 0 m drilled; 79.6 % recovery
131-808B * Latitude: 32.351400 * Longitude: 134.943600 * Date/Time Start: 1990-04-06T15:45:00 * Date/Time End: 1990-04-16T04:00:00 * Elevation: -4685.0 m * Penetration: 358.8 m * Recovery: 59.71 m * Location: Philippine Sea * Campaign: Leg131 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 28 cores; 247.8 m cored; 0 m drilled; 24.1 % recovery
131-808C * Latitude: 32.352800 * Longitude: 134.944300 * Date/Time Start: 1990-04-16T04:00:00 * Date/Time End: 1990-05-02T14:40:00 * Elevation: -4686.0 m * Penetration: 1327 m * Recovery: 572.43 m * Location: Philippine Sea * Campaign: Leg131 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 108 cores; 1028.5 m cored; 0 m drilled; 55.7 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets
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Datasets listed in this publication series
- Behrmann, J-H; Kopf, AJ (1993): (Table 3) Results of strain analyses of ODP Site 131-808 sediments. https://doi.org/10.1594/PANGAEA.785094
- Behrmann, J-H; Kopf, AJ (1993): (Table 4) Results of strain analyses of ODP Site 131-808 sediments. https://doi.org/10.1594/PANGAEA.785095
- Behrmann, J-H; Kopf, AJ (1993): (Table 2) Texture analyses of ODP Site 131-808 sediments. https://doi.org/10.1594/PANGAEA.785093