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O'Regan, Matthew (2007): Tie points and log-adjusted depth scales for ODP Leg 207 Sites [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.776096, Supplement to: O'Regan, M (2007): Data report: Log-adjusted depth scales for Cretaceous black shale deposits from Demerara Rise. In: Mosher, DC; Erbacher, J; Malone, MJ (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 207, 1-29, https://doi.org/10.2973/odp.proc.sr.207.113.2007

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Abstract:
Multiple copies of Cretaceous black shales extending from the early Cenomanian to the end of the Santonian were recovered at five sites on Demerara Rise during Leg 207 of the Ocean Drilling Program. These sediments are primarily composed of laminated organic-rich claystones interbedded with coarser, lightly laminated foraminferal-bearing packstones and wackestones. The black shales represent the local expression of widespread organic-rich sedimentation in the Atlantic during the mid-Cretaceous. However, incomplete recovery prevented construction of continuous composite sections, resulting in uncertainties concerning the correct stratigraphic placement of individual cores. By combining high-resolution measurements of bulk density collected shipboard on the multisensor track with continuous downhole measurements of formation resistivity using the Formation MicroScanner, an equivalent logging depth scale was constructed for black shales recovered from Sites 1258, 1260, and 1261. The integrated depths approach centimeter-scale resolution and are supported by comparisons of coarser resolution natural gamma ray emissions collected on cores and through downhole logging operations. The new depths highlight the extent of both intra- and intercore gaps and provide an opportunity to further constrain temporal and spatial paleoceanographic changes captured in proxy records from these sediments.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 9.248873 * Median Longitude: -54.531696 * South-bound Latitude: 9.048610 * West-bound Longitude: -54.733310 * North-bound Latitude: 9.433333 * East-bound Longitude: -54.317300
Date/Time Start: 2003-01-22T00:00:00 * Date/Time End: 2003-10-28T10:10:00
Event(s):
207-1258 * Latitude: 9.433333 * Longitude: -54.733050 * Date/Time Start: 2003-01-22T00:00:00 * Date/Time End: 2003-02-01T00:00:00 * Elevation: -3192.2 m * Penetration: 1393.4 m * Recovery: 882.7 m * Location: South Atlantic Ocean * Campaign: Leg207 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 141 cores; 1116.6 m cored; 276.8 m drilled; 79 % recovery
207-1258A * Latitude: 9.433330 * Longitude: -54.733310 * Date/Time Start: 2003-01-22T18:15:00 * Date/Time End: 2003-01-25T10:10:00 * Elevation: -3192.2 m * Penetration: 447.5 m * Recovery: 375.46 m * Location: South Atlantic Ocean * Campaign: Leg207 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 50 cores; 447.5 m cored; 0 m drilled; 83.9 % recovery
207-1258B * Latitude: 9.433330 * Longitude: -54.733030 * Date/Time Start: 2003-01-25T10:10:00 * Date/Time End: 2003-10-28T10:10:00 * Elevation: -3192.2 m * Penetration: 460.9 m * Recovery: 346.13 m * Location: South Atlantic Ocean * Campaign: Leg207 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 57 cores; 453.9 m cored; 7 m drilled; 76.3 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets

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Datasets listed in this publication series

  1. O'Regan, M (2007): (Table T3) Composite section tie points for ODP Site 207-1258 log-adjusted coring data. https://doi.org/10.1594/PANGAEA.776091
  2. O'Regan, M (2007): (Table T4) Composite section tie points for ODP Site 207-1260 log-adjusted coring data. https://doi.org/10.1594/PANGAEA.776092
  3. O'Regan, M (2007): (Table T5) Composite section tie points for ODP Site 207-1261 log-adjusted coring data. https://doi.org/10.1594/PANGAEA.776094
  4. O'Regan, M (2007): (Table T1) Tie points used to correlate core (mbsf) with logging (equivalent logging depth) scale at ODP Leg 207 sites. https://doi.org/10.1594/PANGAEA.776090