51 research outputs found
Clay minerals at DSDP Sites 71-511 and 71-513
The distribution of clay minerals, determined by X-ray diffraction, is given for Jurassic to Holocene sediments recovered at DSDP Sites 511 and 513 in the Southwest Atlantic. These data, plus the lithologic and paleoenvironmental information gathered by the shipboard scientists, are used to subdivide the sedimentary sequence into genetic lithologic facies labeled series, seven for Site 511 and two for Site 513. Sediments of these series reflect the main historical and paleoenvironmental events which other means of study have determined to affect this region; particularly important was the opening of the South Atlantic during the Early Cretaceous
Clay minerals in fine grain size fractions from recent bottom sediments of the Gdansk Basin, Baltic Sea
Six regional provinces have been identified in the Gdansk Basin from clay minerals complexes in recent bottom sediments. Mechanism of their formation has been considered. Their dependence on physical and geographical factors of sedimentation (source areas, hydrodynamics, sedimentation rates, etc) has been established. The role of bottom currents and flocculation of particles in processes of distribution of smectite and hydromica suspended matter within the basin has been noticed
(Table 1) Chemical composition of montmorillonites in size fraction <0.01 mm from Pliocene-Quaternary sediments of DSDP Hole 54-420
Clay minerals in Mesozoic and Cenozoic sediments at DSDP Leg 62 Holes
The main tasks of this study were (1) identification of minerals of the clay fraction, (2) identification of clay-mineral associations in relation to stratigraphic intervals, and (3) elucidation of genetic relations of clay minerals with types of sediments and factors of sedimentation. Identification of clay minerals was carried out mainly with an X-ray diffractometer (DRON-I). X-ray diffractograms were prepared by means of CuKalpha radiation, at 35 kW and a current of 20 ma. The scanning rate was 2°/min. Oriented specimens were prepared for the <1-µm fraction (and partly for the <10-µm fraction because of insufficient core material) in three states: air-dried, saturated with glycerine, and heated at 550°C
(Table 2) Carbon isotope composition in carbonates of deep sea sediments from DSDP Hole 41-366
(Table 29) Data of X-ray radiographic analyses of clay minerals from DSDP Site 48-402/Hole 402A
(Table 5) R-mode factor scores of chemical component contents (on terrigenous-free carbonate-free silica-free basis) in Mesozoic and Cenozoic deposits from DSDP Hole 62-463
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