Littke, Ralf; Fourtanier, Elisabeth; Thurow, Juergen W; Taylor, Elliott (1991): Composition and distribution of silica in sediments of the Broken Ridge [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.759053, Supplement to: Littke, R et al. (1991): Silica diagenesis and its effects on lithification of Broken Ridge deposits, Central Indian Ocean. 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, 261-272, https://doi.org/10.2973/odp.proc.sr.121.179.1991
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Abstract:
Within a dipping sequence of middle Cretaceous to Eocene sediments on Broken Ridge, opal-A, opal-CT, and quartz occur as minor constituents in carbonate and ash-rich sediments. Biogenic opal-A is mainly derived from diatoms and radiolarians. Opal-A and almost all siliceous microfossils disappear within a narrow (<20-m-thick) transition zone below which authigenic opal-CT and quartz are present. These latter silica polymorphs occur together within a 750-m-thick interval, but the ratio of quartz/opal-CT increases with increasing age and depth within the pre-rift sediment sequence. The boundary between opal-A- and opal-CT-bearing sediments is also a physical boundary at which density, P-wave velocity, and acoustic impedance change. This physical transition is probably caused by infilling of pore space by opal-CT lepispheres.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -30.939788 * Median Longitude: 93.566911 * South-bound Latitude: -31.030000 * West-bound Longitude: 93.546700 * North-bound Latitude: -30.891000 * East-bound Longitude: 93.578000
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
121-754 * Latitude: -30.941000 * Longitude: 93.566500 * Date/Time Start: 1988-05-13T00:00:00 * Date/Time End: 1988-05-18T00:00:00 * Elevation: -1075.5 m * Penetration: 526.8 m * Recovery: 220.1 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg121 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 47 cores; 402 m cored; 0 m drilled; 54.8% 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
- Littke, R; Fourtanier, E; Thurow, JW et al. (1991): (Table 4) Diatom preservation in ODP Hole 121-752A. https://doi.org/10.1594/PANGAEA.759052
- Littke, R; Fourtanier, E; Thurow, JW et al. (1991): (Table 2) Elemental composition of sediment samples of Broken Ridge. https://doi.org/10.1594/PANGAEA.759020
- Littke, R; Fourtanier, E; Thurow, JW et al. (1991): (Table 1) Silica phases in sediment samples of Broken Ridge. https://doi.org/10.1594/PANGAEA.759019
- Littke, R; Fourtanier, E; Thurow, JW et al. (1991): (Table 3) Estimates of biogenic and nonbiogenic silica in sediment samples of Broken Ridge. https://doi.org/10.1594/PANGAEA.759034