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Compton, John S; Locker, Stanley D (1992): Clay and silica minerals of ODP Site 123-765 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.760802, Supplement to: Compton, JS; Locker, SD (1992): Diagenesis of clay and silica minerals in sediments from the Argo Basin, Northeastern Indian Ocean (Site 765). In: Gradstein, FM; Ludden, JN; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 123, 57-75, https://doi.org/10.2973/odp.proc.sr.123.164.1992

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Abstract:
Sediments recovered from Site 765 can be divided into seven mineral associations, based on differences in clay mineralogy. These clay mineral associations correlate with the lithologic units and reflect the rift-to-drift history of the passive Australian margin. In general, the Lower to mid-Cretaceous sediments represent altered volcanic material and detrital aluminosilicates that were deposited during the early formation of the Argo Basin. The predominant clay mineral is randomly interstratified illite/smectite (I/S) that contains less than 10% illite layers. The transformation of smectite to illite is suggested by an increase in the percentage of illite layers in the basal sediments (from <10% to 40%) that corresponds to the silica transformation of opal-CT to quartz. This mixed-layered illite/smectite has an average composition of (K0.14 Na0.29 C0.07)(Al0.88 Mg0.43 Fe0.61 Ti0.06)(Si3.88 Al0.12)(O)10(OH)2. The highly smectitic composition of the I/S and its association with bentonite layers and zeolite minerals suggest that much of the I/S was derived from the alteration of volcanic material.
The condensed middle to Upper Cretaceous sediments consist of palygorskite and detrital I/S that contains 30% to 60% illite layers. The condensed Paleogene sediments contain no palygorskite and are dominated by detrital clay minerals or by highly smectitic I/S associated with bentonite layers and zeolite minerals. The overlying, rapidly deposited Neogene clayey calcareous turbidites consist of three distinct clay mineral associations. Middle Miocene sediments contain palygorskite, kaolinite, and a tentatively identified mixed-layered illite/smectite/chlorite (I/S/C) or saponite. Upper Miocene sediments contain abundant sepiolite and kaolinite and lesser amounts of detrital I/S. Detrital I/S and kaolinite dominate the clay mineralogy of Pliocene and Pleistocene sediments. The fibrous, magnesium-rich clay minerals sepiolite and palygorskite appear to be authigenic and occur intimately associated with authigenic dolomite. The magnesium required to form these Mg-rich minerals was supplied by diffusion from the overlying seawater, and silica was supplied by the dissolution of associated biogenic silica.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: -15.976000 * Longitude: 117.575200
Date/Time Start: 1988-09-08T02:30:00 * Date/Time End: 1988-09-22T10:30:00
Event(s):
123-765B * Latitude: -15.976000 * Longitude: 117.575200 * Date/Time Start: 1988-09-08T02:30:00 * Date/Time End: 1988-09-11T04:25:00 * Elevation: -5728.0 m * Penetration: 395.6 m * Recovery: 270.92 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg123 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 41 core; 395.6 m cored; 0 m drilled; 68.5 % recovery
123-765C * Latitude: -15.976000 * Longitude: 117.575200 * Date/Time Start: 1988-09-11T04:25:00 * Date/Time End: 1988-09-22T10:30:00 * Elevation: -5728.0 m * Penetration: 963.9 m * Recovery: 373.35 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg123 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 65 cores; 613.7 m cored; 0 m drilled; 60.8 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets

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Datasets listed in this publication series

  1. Compton, JS; Locker, SD (1992): (Table 1) Mineralogy of ODP Site 123-765. https://doi.org/10.1594/PANGAEA.760793
  2. Compton, JS; Locker, SD (1992): (Table 2) Approximate chemical and mineral composition of clay-size separates from ODP Hole 123-765C. https://doi.org/10.1594/PANGAEA.760794
  3. Compton, JS; Locker, SD (1992): (Table 3) Structural formulas of mixed-layer illite/smectite from ODP Hole 123-765C. https://doi.org/10.1594/PANGAEA.760800