The verdine facies off French Guiana

Odin, G.S., Mackinnon, Ian D.R., & Pujos, M. (1988) The verdine facies off French Guiana. In Odin, G.S. (Ed.) Developments in Sedimentology. Elsevier Science BV, pp. 105-130.

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This chapter reviews green grains from the shelf of French Guiana as a regional example of sedimentologic process occurring on the whole stable continental margin from the Amazon to the Orinoco River. Green grains have been observed and analyzed off the Orinoco delta and on the continental shelf of Surinam. These green grains were identified as “chamosite” and “glauconite.” The muddy coast of French Guiana is generally very flat and occupied by wet swamps and mangrove as a result of the equatorial climate. Most green grains on the continental shelf represent the verdine facies. Green grains are ubiquitous on the shelf and top of the slope off French Guiana. Two sedimentological facies exist: glaucony deeper than 150 m and verdine at shallower depths. The verdine facies has mainly developed from mineral debris and especially chloritized biotite. Carbonate bioclasts and faecal pellets are also utilized. The mica flakes were never wholly replaced by authigenic clay and the phenomenon leads to mixed grains where authigenic and substrate remains are recognizable. Carbonate substrates lead to mainly clay pure green grains becasue the initial carbonate has been dissolved. The formation of verdine can be located in a general marine environment at a comparatively warm sea-water temperature and at a depth probably shallower than 60 m.

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ID Code: 55679
Item Type: Book Chapter
Additional Information: GeoRef, Copyright 2009, American Geological Institute. 1989-020985 verdine
Keywords: areal studies, authigenic minerals, chemical composition, clay mineralogy, continental shelf, French Guiana, glauconite, marine environment, mica group, oceanography, sheet silicates, silicates, South America, TEM data, X-ray data
ISBN: 9780444871206
ISSN: 0070-4571
Subjects: Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > GEOLOGY (040300) > Mineralogy and Crystallography (040306)
Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > GEOLOGY (040300) > Sedimentology (040310)
Divisions: Current > Institutes > Institute for Future Environments
Deposited On: 20 Jan 2013 22:15
Last Modified: 21 Oct 2015 16:02

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