The RbSr isotope system as an index of origin and diagenetic evolution of southern Pacific red clays

Clauer, Norbert; Hoffert, Michel; Karpoff, Anne Marie

doi:10.1016/0016-7037(82)90384-2

Cited by 27 publications

(12 citation statements)

References 13 publications

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“…(3) transformation of detrital sediments, especially in deposits with low accumulation rates (Steinberg et al, 1984;Chamley et al, 1990;Thiry & Jacquin, 1993); and (4) authigenesis from seawater, especially when the accumulation rate is low (Clauer et al, 1982 ;Steinberg, 1989). In the Moroccan Atlantic margin, smectite is described as the major component of the clay fraction of the CenomanianÀTuronian sediments at the Agadir site (Daoudi et al, 1989), at the Tarfaya basin (El Albani, 1995) and at the Middle Atlas basin .…”

mentioning

confidence: 97%

Palaeoenvironmental significance of clay minerals in Upper Cenomanian–Turonian sediments of the Western High Atlas Basin (Morocco)

Daoudi¹,

Rocha

Ouajhain

et al. 2008

Clay miner.

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AB ST R ACT : Upper CenomanianÀTuronian clay mineral assemblages of sediments cropping out in the Western High Atlas basin are studied in four sections. Smectite and mixed-layer illite-smectite (I-S) have been identified as major constituents of the deposits. The composition of clay associations in black shales and associated sediments varies considerably according to age, but usually depends either on the general lithology, the abundance of organic matter, or the depth of burial. A distinct correlation is evident between clay mineral distribution and sea-level. Smectite and mixed-layer I-S with greater percentages of smectite layers increase in sediments deposited during transgressive periods, whereas they decrease progressively in the shallower facies deposited during regression in favour of illite and mixed-layer I-S with a greater percentage of illite. The vertical evolution and lateral distribution of clay assemblages and their relationships with sea-level as well as the palaeogeographic conditions prevailing during the Late CenomanianÀTuronian period (flattened topography and arid climate), indicate a detrital origin of the smectite minerals and a distribution pattern controlled by differential settling processes.

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confidence: 97%

Palaeoenvironmental significance of clay minerals in Upper Cenomanian–Turonian sediments of the Western High Atlas Basin (Morocco)

Daoudi¹,

Rocha

Ouajhain

et al. 2008

Clay miner.

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“…The results obtained on core 1 have already been published (Hoffert 1980;Clauer et al 1982); they are summarized with the new data obtained in this study (Figs 3 and 4).…”

Section: Resultsmentioning

confidence: 66%

“…The particles of 1-2 ~tm appear circular on the electron microscope photographs with sharp borders often rolled up and/or prolonged by delicate fibre-like prolongations of 0.5 ~tm length which seem to grow from the particles (Fig. 3 in Clauer et al 1982). The chemical compositions of these smectites vary with depth; they show a decrease in Mg, Ca, Ti and Na contents and an increase in Fe and K contents (Fig.…”

Section: Resultsmentioning

confidence: 93%

Sr isotopic constraints for the sedimentation rate of deep sea red clays in the southern Pacific Ocean

Clauer¹,

Hoffert²

1985

Memoirs

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SummarySedimentological, mineralogical, chemical and Rb-Sr isotopic studies were made on Fe-smectites (nontronites) from deep sea red clays taken from two cores located 100 km apart in the southern Pacific Ocean. They show that: (1) these sediments are authigenic, (2) they contain variable but few amounts of volcanic-derived chemical components, and (3) they were transported from some place in the ocean and deposited at the present-day site. The transportation, which could occur at different periods, was likely induced by the submarine topography and bottom currents.These observations necessitate a reconsideration of the traditional concept of sedimentation rate for the red clay facies. Although exhibiting considerable similarities, these sediments may correspond to different stages of a submarine sedimentary cycle. A given horizon can therefore reflect a submarine pedological event, a sudden and massive accumulation, or a very low sedimentation of material formed elsewhere. Genetic information is necessary to determine the local sedimentation rates of red clay, and the inconstancy of the sedimentation prevents any generalization on an ocean-wide scale.

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“…Consequently, Sr isotope measurement of a marine carbonate to determine the isotope composition of the immediate environment of the clays has to be checked by leaching of the clay fractions. The Rb-Sr studies of Clauer et al (1975) and Clauer et al (1982a) on smectites from deep-sea red clays have shown that these minerals might have interacted with their formation environment soon after deposition. Combination of the Rb-Sr isotopic data of the solid material and the interstitial fluids suggested that slight migration of radiogenic 87Sr into the interstitial fluids may happen (Fig.…”

Section: Concept Of Isotopic Homogenizationmentioning

confidence: 98%

Revisited Isotopic Dating Methods of Sedimentary Minerals for Stratigraphic Purpose

Clauer¹,

Chaudhuri²

1997

Soils and Sediments

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The RbSr isotope system as an index of origin and diagenetic evolution of southern Pacific red clays

Cited by 27 publications

References 13 publications

Palaeoenvironmental significance of clay minerals in Upper Cenomanian–Turonian sediments of the Western High Atlas Basin (Morocco)

Palaeoenvironmental significance of clay minerals in Upper Cenomanian–Turonian sediments of the Western High Atlas Basin (Morocco)

Sr isotopic constraints for the sedimentation rate of deep sea red clays in the southern Pacific Ocean

Revisited Isotopic Dating Methods of Sedimentary Minerals for Stratigraphic Purpose

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