Alteration mineralogy of Cretaceous basalt from ODP Site 1001, Leg 165 (Caribbean Sea)
Alteration mineralogy of Cretaceous basalt from ODP Site 1001, Leg 165 (Caribbean Sea)
Secondary clay minerals observed in the two uppermost basalt lava flows at ODP Site 1001, in the Caribbean Sea, drilled from the large igneous province of Cretaceous age, result from low-temperature alteration processes. Alteration mainly proceeds by circulation and diffusion of sea water. Six different types of clay mineral assemblage were recognized. Initial alteration with oxygenated sea water involves Fe and K fixation, creating visible oxidation halos parallel to the sides of cracks and fissures. A saponite/beidellite mixture, interstratified smectite-glauconite, interstratified glauconite-nontronite and Fe oxyhydroxides are obtained depending on the distance from fluid conduits. The presence of beidellite may be due to enhanced Al mobilization resulting from high fluid flux. These early minerals are cross-cut by thin veins of pure celadonite or glauconite with further vesicle infill. Late-stage alteration is typified by the formation of saponite and takes place
ODP LEG 165, ODP SITE 1001, BASALT SEAWATER ALTERATION, LAVA
719-733
Clayton, T.
d942929b-d30e-4679-8b95-3c17cc83cd20
Pearce, R.B.
7d772b25-3ad0-4909-9a96-3a1a8111bc2f
2000
Clayton, T.
d942929b-d30e-4679-8b95-3c17cc83cd20
Pearce, R.B.
7d772b25-3ad0-4909-9a96-3a1a8111bc2f
Clayton, T. and Pearce, R.B.
(2000)
Alteration mineralogy of Cretaceous basalt from ODP Site 1001, Leg 165 (Caribbean Sea).
Clay Minerals, 35 (4), .
(doi:10.1180/000985500547043).
Abstract
Secondary clay minerals observed in the two uppermost basalt lava flows at ODP Site 1001, in the Caribbean Sea, drilled from the large igneous province of Cretaceous age, result from low-temperature alteration processes. Alteration mainly proceeds by circulation and diffusion of sea water. Six different types of clay mineral assemblage were recognized. Initial alteration with oxygenated sea water involves Fe and K fixation, creating visible oxidation halos parallel to the sides of cracks and fissures. A saponite/beidellite mixture, interstratified smectite-glauconite, interstratified glauconite-nontronite and Fe oxyhydroxides are obtained depending on the distance from fluid conduits. The presence of beidellite may be due to enhanced Al mobilization resulting from high fluid flux. These early minerals are cross-cut by thin veins of pure celadonite or glauconite with further vesicle infill. Late-stage alteration is typified by the formation of saponite and takes place
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Published date: 2000
Keywords:
ODP LEG 165, ODP SITE 1001, BASALT SEAWATER ALTERATION, LAVA
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Local EPrints ID: 8724
URI: http://eprints.soton.ac.uk/id/eprint/8724
ISSN: 0009-8558
PURE UUID: f1dcf9d6-7ee9-44c1-a65b-b8f85ce9ed35
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Date deposited: 24 Aug 2004
Last modified: 15 Mar 2024 04:52
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Author:
T. Clayton
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