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Pospichal, James J; Dehn, Jonathan; Driscoll, Neal W; van Eijden, AJM; Farrell, John W; Fourtanier, Elisabeth; Gamson, Paul; Gee, Jeff S; Janecek, Thomas R; Jenkins, D Graham; Klootwijk, Christian T; Nomura, Ritsuo; Owen, Robert M; Rea, David K; Resiwati, Purtyasti; Smit, Jan; Smith, Guy M (1991): Cretaceous-Paleogene biomagnetostratigraphy of ODP Leg 121 sites [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.759588, Supplement to: Pospichal, JJ et al. (1991): Cretaceous-Paleogene biomagnetostratigraphy of Sites 752–755, Broken Ridge: a synthesis. In: Weissel, J; Peirce, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 121, 721-741, https://doi.org/10.2973/odp.proc.sr.121.181.1991

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Abstract:
Broken Ridge, in the eastern Indian Ocean, is a shallow-water volcanic platform which formed during the Early to middle Cretaceous at which time it comprised the northern portion of the Kerguelen-Heard Plateau. Rifting during the middle Eocene and subsequent seafloor spreading has moved Broken Ridge about 20 infinity N to its present location. The sedimentary section of Broken Ridge includes Turonian-lower Eocene limestone and chalk with volcanic ash, an interval of detrital sands and gravels associated with middle Eocene rifting and uplift, and a middle-late Oligocene unconformity overlain by a thin section of Neogene-Holocene pelagic calcareous ooze. This paper summarizes the available post-cruise biostratigraphic and magnetostratigraphic data for the Cretaceous-Paleogene section on Broken Ridge. The synthesis of this information permits a more precise interpretation of the timing of events in the history of Broken Ridge, in particular the timing and duration of the middle Eocene rifting event. Paleontologic data support rapid flexural uplift of Broken Ridge in response to mechanical rather than thermal forces. Other highlights of the section include a complete Cretaceous/Tertiary boundary and an opportunity for first-order correlation of Paleogene diatom stratigraphy with that of the calcareous groups.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -30.905644 * Median Longitude: 93.574568 * South-bound Latitude: -31.030000 * West-bound Longitude: 93.546700 * North-bound Latitude: -30.839000 * East-bound Longitude: 93.589900
Date/Time Start: 1988-05-10T00:00:00 * Date/Time End: 1988-05-24T07:30:00
Event(s):
121-752 * Latitude: -30.891000 * Longitude: 93.577750 * Date/Time Start: 1988-05-10T00:00:00 * Date/Time End: 1988-05-22T00:00:00 * Elevation: -1097.0 m * Penetration: 753.2 m * Recovery: 329.7 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg121 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 51 cores; 475.6 m cored; 0 m drilled; 69.3% recovery
121-752A * Latitude: -30.891000 * Longitude: 93.578000 * Date/Time Start: 1988-05-10T03:15:00 * Date/Time End: 1988-05-12T13:55:00 * Elevation: -1097.0 m * Penetration: 317.6 m * Recovery: 217.32 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg121 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 34 cores; 317.6 m cored; 0 m drilled; 68.4 % recovery
121-752B * Latitude: -30.891000 * Longitude: 93.577500 * Date/Time Start: 1988-05-18T09:00:00 * Date/Time End: 1988-05-22T12:30:00 * Elevation: -1097.0 m * Penetration: 435.6 m * Recovery: 112.34 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg121 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 17 cores; 158 m cored; 0 m drilled; 71.1 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
6 datasets

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Datasets listed in this publication series

  1. Pospichal, JJ; Dehn, J; Driscoll, NW et al. (1991): (Table 4) Foraminifer datum levels of ODP Site 121-752. https://doi.org/10.1594/PANGAEA.759582
  2. Pospichal, JJ; Dehn, J; Driscoll, NW et al. (1991): (Table 6) Magnetic chron boundaries in ODP Site 121-752. https://doi.org/10.1594/PANGAEA.759585
  3. Pospichal, JJ; Dehn, J; Driscoll, NW et al. (1991): (Table 3) Nannofossil datum levels of ODP Site 121-752. https://doi.org/10.1594/PANGAEA.759581
  4. Pospichal, JJ; Dehn, J; Driscoll, NW et al. (1991): (Table 5) Diatom datum levels of ODP Hole 121-752A. https://doi.org/10.1594/PANGAEA.759583
  5. Pospichal, JJ; Dehn, J; Driscoll, NW et al. (1991): (Table 8) Magnetic chron boundaries in ODP Leg 121 holes. https://doi.org/10.1594/PANGAEA.759587
  6. Pospichal, JJ; Dehn, J; Driscoll, NW et al. (1991): (Table 7) Nannofossil and foraminifer datum events of ODP Leg 121 holes. https://doi.org/10.1594/PANGAEA.759586