992 resultados para 128-798A


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The capability of determining elemental concentrations through geochemical logging has recently been established. However, the quality of these data obtained in some environments has yet to be quantified. We assess the quality of geochemical logs compared with XRF results from a suite of core samples from Hole 798B. The resulting core/log correlations are only fair, because the tool has been adversely affected by the very high porosity of the formation. The results, however, do fall within the statistical uncertainties predicted by the processing. The recent application of a modified boron sleeve to the Ocean Drilling Program's geochemical logging tool is shown to reduce interference of borehole chlorine on the resultant chemistry.

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Notable compositional changes of organic matter are observed below the silica transition zone in thermally immature sediments. The increase of bitumen ratio, and hopane and sterane isomerization parameters indicate an acceleration of the kinetics of the chemical reactions which transform the organic matter. This phenomenon is probably due to the numerous mineral and textural changes induced by the transformation of amorphous biogenic silica into crystalline authigenic silica.

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v. 1. Festival march in D -- v. 2. Communion in E minor -- v. 3. Fantasia in B minor -- v. 4. Toccatina in G minor -- v. 5. Canzona in F -- v. 6. Finale in E flat.

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Reissued from plates of Ed. Bote & G. Bock. Pl. no.: B. & B. 18136.