|
|
|
|
|
| Pujos, M; Latouche, C; Maillet, N. |
| Marine muds deposited on the French Guiana coast mostly originate in the Amazon. Recent sediments are composed of (a) illite (33 %) and chlorite (13 %) of Andean mountain origin; and (b) kaolinite (28 %) and smectite (26 %), principally from the Amazonian lowlands but also from the Guiana Shield. In the coastal mud prism, high-resolution seismic profiles, together with sedimentological, micropaleontological and soil engineering studies, supplemented by C-14 dates, permitted a stratigraphic interpretation of eight cores. Three episodes have been determined on the basis of clay-mineral variations related to Amazonian lowland, Andean and Guiana shield sources. The older episodes 3 (3000-1700 y BP) and 2 (1700-1000 y BP) are predominantly characterized by... |
| Tipo: Text |
Palavras-chave: Late quaternary; French Guiana; Shelf; Clay minerals; ENSO. |
| Ano: 1996 |
URL: http://archimer.ifremer.fr/doc/00094/20506/18175.pdf |
| |
|
|
| Latouche, C; Jouanneau, J M; Lapaquellerie, Y; Maillet, N; Weber, O. |
| The southern Biscay shelf is a typical example of a continental margin submitted to a macrotidal regime and the heavy sedimentary fluxes of continental provenance. The aim of this study was to determine the manner in which clay sedimentation is organized on the margin and to evaluate the impact of both river-borne inputs and marine hydrodynamic activity. It was established that the distribution of clay minerals (in the order of frequence: micas, chlorites, illites and smectites) is upset by the interconnection of several sedimentary processes: discontinuous river-borne discharges (richer in smectites); the mixture of newly-arrived material with fine fractions (rich in micas and chlorites) resulting from the reworking of remnant material that represents the... |
| Tipo: Text |
|
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00268/37889/35970.pdf |
| |
|
|
| Faugeres, J-c; Gayet, J; Gonthier, E; Latouche, C; Maillet, N. |
| Mineralogical analyses of sediments from the Makassar Strait, collected during the Corindon and Misedor cruises (dredges, piston and box cores) show the existing differences between sediments supplied from Kalimantan in the West and sediments supplied from Sulawesi in the East. The Kalimantan source is characterized by quartzitic sand, with rare feldspars, heavy minerals consisting mainly of pyroxene (hypersthene) and amphibole and predominant illite-kaolinite in the clay mineral assemblage. In contrast, the Sulawesi source differs by a great abundance of feldspars, lithoclasts and micas with predominant amphibole and pyroxene (augite) and major illite-chlorite clay minerals. |
| Tipo: Text |
|
| Ano: 1990 |
URL: http://archimer.ifremer.fr/doc/00268/37924/36005.pdf |
| |
|
|
| Pujos, M; Monente, J; Latouche, C; Maillet, N. |
| The suspended matter transported by the Orinoco to the Orinoco delta originates mainly in the Colombian Andes. The four clayey minerals (kaolinite, chlorite, illite and smectite) are always present in the deltaic suspensions, the delta deposits and the gulf of Paria. Illite contents are always dominant except in those regions of the gulf of Paria situated far from the mouths of the Orinoco tributaries characterized by smectites. In the delta, illite contents which are minimal during the dry season increase noticeably during the wet season which is marked by a high Liquid and particulate matter discharge. In the delta, the clay mineralogy of the substrate is comparable to that of dry season suspensions (February), thus showing a sedimentation composed of... |
| Tipo: Text |
|
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00093/20435/18102.pdf |
| |
|
|
|
