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Hiscott, Richard N (2007): Ripple migration directions and grain fabric measurements on ODP Hole 210-1276A sediments. PANGAEA, https://doi.org/10.1594/PANGAEA.776586, Supplement to: Hiscott, RN (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, https://doi.org/10.2973/odp.proc.sr.210.103.2007

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Abstract:
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 point southeast. Nevertheless, the overall pattern of paleoflow suggests a source for the turbidity currents on the southeastern Grand Banks, likely from the long-emergent Avalon Uplift in that area. On average, turbidity currents apparently flowed axially in the young Albian rift, toward the north. This is opposite to what might be expected for a northward-propagating rift and a young ocean opening in a zipperlike fashion from south to north.
Project(s):
Coverage:
Latitude: 45.405330 * Longitude: -44.785830
Date/Time Start: 2003-02-09T16:20:00 * Date/Time End: 2003-07-16T08:44:00
Event(s):
210-1276A * Latitude: 45.405330 * Longitude: -44.785830 * Date/Time Start: 2003-07-16T08:44:00 * Date/Time End: 2003-02-09T16:20:00 * Elevation: -4549.1 m * Penetration: 1736.9 m * Recovery: 790.35 m * Location: South Atlantic Ocean * Campaign: Leg210 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 103 cores; 936.9 m cored; 753 m drilled; 84.4 % recovery
Size:
3 datasets

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