Ripple migration directions and grain fabric measurements on ODP Hole 210-1276A sediments ...

• Main Author: Hiscott, Richard N
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2007
• Subjects: Drilling/drill rig; Leg210; Joides Resolution; Ocean Drilling Program ODP; Klaus; Newfoundland
• Online Access: https://dx.doi.org/10.1594/pangaea.776586; https://doi.pangaea.de/10.1594/PANGAEA.776586

Albian turbidites and intercalated shales were cored from ~1145 to 1700 meters below seafloor at Site 1276 in the Newfoundland Basin. Strata at this level dip ~2.5° seaward (toward an azimuth of ~130°) based on seismic profiles. In contrast, beds dip an average of ~10° in the cores. This higher apparent dip is the sum of the ~2.5° seaward dip and a measured hole deviation of 7.43°, which must be essentially in the same seaward direction. Using the maximum dip direction in the cores as a reference direction, paleocurrents were measured from 11 current-ripple foresets and 11 vector means of grain fabric in planar-laminated sandstones. Five of the planar-laminated sandstone samples have a grain imbrication 8°, permitting specification of a unique flow direction rather than just the line-of-motion of the current. Both ripples and grain fabric point to unconfined flow toward the north-northeast. There is considerable spread in the data so that some paleoflow indicators point toward the northwest, whereas others ... : Supplement to: Hiscott, Richard N (2007): Paleoflow directions of Albian basin-floor turbidity currents in the Newfoundland Basin. In: Tucholke, B.E., Sibuet, J.-C., and Klaus, A. (Eds.), Proc. ODP, Sci. Results, 210 : College Station, TX (Ocean Drilling Program), 210, 1-27 ...