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• W2183615609 abstract "Chemical analyses for calcium carbonate, organic carbon, and major constituents (Al, Ti, Ca, Mg, K, Fe) of bulk sediments collected in Hole 67IB have been carried out. Organic carbon contents in Pleistocene through middle Mio­ cene sediments above the zone of decollement are very low (<0.1%); below the decollement considerably higher con­ centrations of organic carbon occur (up to 1 %). Changes in Ti/Al and Fe/Al ratios are minor, but K/Al and Mg/Al ratios show clear trends with the age of the sediments. Preliminary comparisons of these ratios with mineralogic infor­ mation on clays indicate good correspondence with clay abundances. Calculations of the mass flux of magnesium from the overlying ocean into the pore fluids suggest that addition of magnesium to the sediments is difficult to detect, espe­ cially in the absence of a background reference concentration. ra­ tio of dissolved strontium are strongly affected by reactions in­ volving the alteration of volcanic matter dispersed in the upper Pleistocene and Pliocene sediments. Observed decreases in the oxygen isotopic composition of the interstitial waters (Vrolijk et al., this volume) also imply alteration of volcanic matter. Simi­ lar observations have been made elsewhere in areas where vol­ canic matter contributions to the sediments have been shown to be of importance (Gieskes and Lawrence, 1981; Gieskes et al., 1987). Although decreases in magnesium and potassium in the interstitial waters have been observed, it remains to be deter­ mined if the flux of these constituents from the overlying ocean can contribute a measurable signal in the solid phases of the sediments. In this study we present information on the bulk chemical composition of the sediments of Hole 67IB, which will serve as background information for this purpose. Site 671 was drilled at a water depth of 4915 m about 4 km arcward from the toe of the Barbados accretionary prism (Moore, Mascle, Taylor et al., 1987). As a result of the tectonic activity associated with the accretionary process, the lithostratigraphy of the sediment column is complex, which is particularly evi­ dent from the repeat of the early Pleistocene-late Miocene sedi­ ment section below about 120 m as a result of major thrusting (Fig. 1). As a consequence, the well-defined, relatively radiolar- ian-rich decollement zone, which is located at Site 672 at about 200 m (Fig. 1), now occurs at a depth of about 500 m, thus indi­ cating a considerable tectonic thickening at only a short dis­ tance from the toe of the prism. The sediments below the de­ collement zone are tectonically relatively undisturbed, but we were not able to penetrate through the sand layers at the bottom of the site (Moore, Mascle, Taylor, et al., 1987)." @default.
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• W2183615609 date "1990-05-01" @default.
• W2183615609 modified "2023-09-23" @default.
• W2183615609 title "Bulk Chemical Analysis of Sediments—Hole 671B" @default.
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• W2183615609 doi "https://doi.org/10.2973/odp.proc.sr.110.140.1990" @default.
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