Sr and Ar isotope studies of detrital smectites from the Atlantic Ocean (D.S.D.P., Legs 43, 48 and 50)期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Sr and Ar isotope studies of detrital smectites from the Atlantic Ocean (D.S.D.P., Legs 43, 48 and 50)

Authors:	Norbert Clauer Patrick Giblin Jacques Lucas

Institution:	1. Centre de Sédimentologie et Géochimie de la Surface (C.N.R.S.) and Institut de Géologie de l''Université Louis Pasteur, 67084 Strasbourg Cedex, France;2. Société Nationale Elf Aquitaine (Production), 64001 Pau Cedex, France

Abstract:	Mineralogical, morphological and isotopic (RbSr and KAr) determinations were made on some detrital smectites of Palaeocene and Cenomanian ages from D.S.D.P. drillings in the Atlantic Ocean. These minerals are not inert in their depositional environment; authigenic laths grow on detrital sheets with sharp borders. This authigenesis could occur slightly after deposition in a closed system, for some of these smectites. It has been tentatively quantified by the RbSr and KAr isotopic methods, which seem also well suited to evaluate the chemical extent of this authigenesis. At least, no preferential loss of ⁴⁰Ar vs. ⁸⁷Sr could be detected in the minerals, even in those which are smaller than 0.2 μm.

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