Geochemistry of Tertiary alterite clay phases on the Iceland-Faeroe Ridge (northeast Atlantic), leg 38, site 336

Mineralogy and origin of Tertiary interbasaltic clays from the Faeroe Islands, Northeastern Atlantic

“…These assemblages dominate soil profiles formed from weathered volcanic rocks under hot climatic conditions with alternating moist and dry seasons (Tardy, 1969;Paquet, 1970;Singer, 1966Singer, , 1970Singer, , 1978Duchaufour, 1977;Xu Ji Quan, 1983). Such Tertiary formations having the same mineralogical assemblages have been observed on the Faeroe-Iceland Ridge (DSDP site 336, leg 38) (Nilsen & Kerr, 1978;Parra et al, 1986), on the Scottish islands of Mull and Skye (Godart et al, 1961 ;Bain & Russell, 1980), in the Massif Central of France (Grangeon, 1959;Moinereau, 1966;Camus & Kieffer, 1980;Chesworth et al, 1983)and in Israel (Singer, 1970). Spheroidal alteration at the base of each profile, together with the heterogeneity of the mineralogical and chemical compositions of the clays, is further support for the existence of paleosols on the Faeroe Islands.…”

Deep‐water mass source and dynamic associated with rapid climatic variations during the last glacial stage in the North Atlantic: A multiproxy investigation of the detrital fraction of deep‐sea sediments

“…Smectite is largely of detrital origin in the North Atlantic [ Behairy et al , 1975], where it is derived from different sources and processes [ Biscaye , 1965; Griffin et al , 1968; Chamley , 1989; Fagel et al , 2001]. In the subpolar North Atlantic, highest smectite concentrations occur in the region of Iceland and Faeroe‐Shetland islands [ Latouche and Parra , 1976, 1979; Grousset et al , 1982; Parra , 1980; Parra et al , 1986]. Therefore the mineralogical assemblage composed of magnetites, smectites and Ti‐rich fraction, as identified in the three studied cores, clearly corresponds to the fraction of the sediment originating from the weathering of these basaltic rocks.…”

Smectite composition as a tracer of deep circulation: the case of the Northern North Atlantic

“…Montmorillonite and beidellite (Al end-member) mostly result from the chemical weathering of diverse substrates under a wide spectrum of environmental conditions. Fe-beidellites and nontronites (Fe end-member) commonly derive from meteoric weathering or hydro-thermal alteration of basalts; they are particularly abundant in active areas of mid-oceanic ridges (Haggerty and Baker, 1967;McMurthy et al, 1983;Parra et al, 1985Parra et al, , 1986.…”