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Rea, David K; Dehn, Jonathan; Driscoll, Neal W; Farrell, John W; Janecek, Thomas R; Owen, Robert M; Pospichal, James J; Resiwati, Purtyasti (1990): Accumulation rates of sediments and main sedimentary components in ODP Leg 121 holes on Broken Ridge [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.720962, Supplement to: Rea, DK et al. (1990): Paleoceanography of the eastern Indian Ocean from ODP Leg 121 drilling on Broken Ridge. Geological Society of America Bulletin, 102(5), 679-690, https://doi.org/10.1130/0016-7606(1990)102%3C0679:POTEIO%3E2.3.CO;2

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Abstract:
Broken Ridge, in the eastern Indian Ocean,is overlain by about 1600 m of middle Cretaceous to Pleistocene tuffaceous and carbonate sediments that record the oceanographic history of southern hemisphere mid-to high-latitude regions. Prior to about 42 Ma, Broken Ridge formed the northern part of the broad Kerguelen-Broken Ridge Plateau. During the middle Eocene, this feature was split by the newly forming Southeast Indian Ocean Ridge; since then, Broken Ridge has drifted north from about 55° to 31°S.
The lower part of the sedimentary section is characterized by Turonian to Santonian tuffs that contain abundant glauconite and some carbonate. The tuffs record a large but apparently local volcanic input that characterized the central part of Broken Ridge into the early Tertiary. Maestrichtian shallow-water(several hundred to 1000 m depth) limestones and cherts accumulated at some of the highest rates ever documented from the open ocean, 4 to 5 g/cm**2/kyr. A complete (with all biostratigraphic zones) Cretaceous-Tertiary boundary section was recovered from site 752. The first 1.5 m.y. of the Tertiary is characterized by an order-of-magnitude reduction in the flux of biogenic sediments, indicating a period of sharply reduced biological productivity at 55°S, following which the carbonate and silica sedimentation rates almost reach the previous high values of the latest Cretaceous. We recovered a complete section through the Paleocene that contains all major fossil groups and is more than 300 m thick, perhaps the best pelagic Paleocene section encountered in ocean drilling. About 42 Ma, Broken Ridge was uplifted 2500 m in response to the intra-plateau rifting event; subsequent erosion and deposition has resulted in a prominent Eocene angular unconformity atop the ridge. An Oligocene disconformity characterized by a widespread pebble layer probably represents the 30 Ma sea-level fall. The Neogene pelagic ooze on Broken Ridge has been winnowed, and thus its grain size provides a direct physical record of the energy of the southern hemisphere drift current in the Indian Ocean for the past 30 m.y.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -30.923469 * Median Longitude: 93.570583 * South-bound Latitude: -31.030000 * West-bound Longitude: 93.546700 * North-bound Latitude: -30.839000 * East-bound Longitude: 93.589900
Date/Time Start: 1988-05-10T03:15:00 * Date/Time End: 1988-05-24T07:30:00
Event(s):
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
121-753A * Latitude: -30.839000 * Longitude: 93.589900 * Date/Time Start: 1988-05-12T16:30:00 * Date/Time End: 1988-05-13T06:15:00 * Elevation: -1187.0 m * Penetration: 62.8 m * Recovery: 61.06 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg121 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 7 cores; 62.8 m cored; 0 m drilled; 97.2 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
7 datasets

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Datasets listed in this publication series

  1. Rea, DK; Dehn, J; Driscoll, NW et al. (1990): (Table 3) Accumulation rates of major sedimentary components in ODP Leg 121 holes. https://doi.org/10.1594/PANGAEA.720951
  2. Rea, DK; Dehn, J; Driscoll, NW et al. (1990): (Table 2) Mass accumulation rates of sediment in ODP Hole 121-752A. https://doi.org/10.1594/PANGAEA.720944
  3. Rea, DK; Dehn, J; Driscoll, NW et al. (1990): (Table 2) Mass accumulation rates of sediment in ODP Hole 121-752B. https://doi.org/10.1594/PANGAEA.720945
  4. Rea, DK; Dehn, J; Driscoll, NW et al. (1990): (Table 2) Mass accumulation rates of sediment in ODP Hole 121-753A. https://doi.org/10.1594/PANGAEA.720946
  5. Rea, DK; Dehn, J; Driscoll, NW et al. (1990): (Table 2) Mass accumulation rates of sediment in ODP Hole 121-754A. https://doi.org/10.1594/PANGAEA.720947
  6. Rea, DK; Dehn, J; Driscoll, NW et al. (1990): (Table 2) Mass accumulation rates of sediment in ODP Hole 121-754B. https://doi.org/10.1594/PANGAEA.720948
  7. Rea, DK; Dehn, J; Driscoll, NW et al. (1990): (Table 2) Mass accumulation rates of sediment in ODP Hole 121-755A. https://doi.org/10.1594/PANGAEA.720949