Mineralogy and geochemistry of weathered serpentinites in DSDP Leg 84 sediments
| Cobertura |
MEDIAN LATITUDE: 12.909800 * MEDIAN LONGITUDE: -91.033724 * SOUTH-BOUND LATITUDE: 12.716000 * WEST-BOUND LONGITUDE: -91.392800 * NORTH-BOUND LATITUDE: 13.285300 * EAST-BOUND LONGITUDE: -90.692200 * DATE/TIME START: 1982-01-24T00:00:00 * DATE/TIME END: 1982-02-17T00:00:00 |
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| Data(s) |
11/12/1985
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| Resumo |
At Sites 566, 567, and 570 of Leg 84, ophiolitic serpentinite basement was covered by a sequence of serpentinitic mud that was formed by weathering of the serpentinites under sea- or pore-water conditions. Several mineralogical processes were observed: (1) The serpentinitic mud that consists mainly of chrysotile was formed from the lizardite component of the serpentinites by alteration. (2) Slightly trioctahedral smectites containing nonexpandable mica layers, trioctahedral smectites containing nonexpandable chlorite layers, and swelling chlorites were presumably formed from detrital chlorite and/or serpentine. (3) The occurrence of tremolite, chlorite, analcime, and talc can be attributed to reworking of gabbroic ophiolite rocks. (4) Dolomite, aragonite, and Mg-calcite, all authigenic, occur in the serpentinitic mud. |
| Formato |
application/zip, 3 datasets |
| Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.803889 doi:10.1594/PANGAEA.803889 |
| Idioma(s) |
en |
| Publicador |
PANGAEA |
| Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
| Fonte |
Supplement to: Helm, Roger (1985): Mineralogy and geochemistry of weathered serpentinites, Deep Sea Drilling Project Leg 84. In: von Heune, R; Aubouin, J; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 84, 595-607, doi:10.2973/dsdp.proc.84.116.1985 |
| Palavras-Chave | #(001), 350 deg C, #1.1; (001), 350 deg C, #1.2; (001), 500 deg C, #1-1; (001), 500 deg C, #1-2; (001), 500 deg C, #2; (001), glycolated; (001), untreated; (002), glycolated; (003), glycolated; (060), nonorientated, #1; (060), nonorientated, #2; Al2O3; Aluminium oxide; Ba; Barium; Calcium oxide; CaO; Chlorine; Chromium; Cl; Co; Cobalt; Copper; Cr; Cu; d; Deep Sea Drilling Project; Description; DSDP; d-spacing; Electron microscopy; Empty cells indicate that the first four samples are hard rock, so they have no grain size; Event; Fe2O3; Fraction; Grain size, sieving; Grain size descr; Grain size description; Iron oxide, Fe2O3; K2O; Magnesium oxide; Manganese oxide; MgO; Minerals; MnO; Na2O; Nb; Ni; Nickel; Niobium; ODP sample designation; P2O5; Phosphorus oxide; Potassium oxide; Rb; Rock; Rock type; Rubidium; Sample code/label; Serpentine; Silicon dioxide; SiO2; Size fraction; Sodium oxide; Sr; Srp; Strontium; Sulphur, total; TiO2; Titanium oxide; TS; V; Vanadium; X-ray diffraction; X-ray fluorescence (XRF); Y; Yttrium; Zinc; Zirconium; Zn; Zr |
| Tipo |
Dataset |
