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| Mabesoone, J.M.. |
| In this second paper the red beds outcropping in the northern part of the Duero basin have been treated regarding their mineral and pebble composition, chemical parameters, and surface textures of quartz sand grains, taking as basis the results reported in the first paper. These deposits originate from soils in the source area, and have been rapidly supplied into the basin by braiding rivers. Heavy mineral associations and pebble composition prove the source area to be lying north and west of the area of deposition. Ferric iron oxides, clay mineral associations, and hydrogen ion concentrations point to a red soil formation in the source area which had not yet attained the laterite stage, but which had already suffered alkaline leaching. The presence of... |
| Tipo: Article / Letter to the editor |
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| Ano: 1961 |
URL: http://www.repository.naturalis.nl/record/505929 |
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| Mabesoone, J.M.. |
| Red sediments of Tertiary age crop out alongside the southern border of the Cantabrian Mountains in the northern part of the Duero basin. They consist mainly of conglomerates with quartzite pebbles, sandstones, and sandy, loamy, and marly deposits, all with a deep red colour. Detailed analyses were made on grain size composition, on pebble roundness, and on sand grain roundness and sphericity. The results are presented in triangle-diagrams for nomenclature, cumulative curves of size frequency distributions, graphs showing changes of sediment properties with transport distance, and in a facies map. The following conclusions can be drawn: (1) the source area of the sediments was a mountain chain with outcropping Paleozoic and Mesozoic deposits and their... |
| Tipo: Article / Letter to the editor |
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| Ano: 1961 |
URL: http://www.repository.naturalis.nl/record/505782 |
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| Oele, E.; Mabesoone, J.M.. |
| In the valley of Ocejo (prov. León) a series of alternating conglomerates, sandstones, siltstones, and shales with a red colour are found. This series is 180 m thick, of Stephanian B + C age, and at present dips ± 30°W. Sedimentological analysis gives the following data: (1) quartz is the dominant detrital mineral, hematite and clay form the cement; (2) the components of the conglomerates are chiefly limestones of cobble size, the fine-grained sediments and matrices being chiefly siltstones with varying admixtures of clay size material; (3) the limestone pebbles have low roundness- and flatness-index values. The sediment was deposited by torrents at the foot of a rising mountain area. The source region had a thick cover of red soil on top of limestones.... |
| Tipo: Article / Letter to the editor |
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| Ano: 1963 |
URL: http://www.repository.naturalis.nl/record/505914 |
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| Mabesoone, J.M.. |
| Sediments in the foreland of a mountain chain are sometimes suited to reconstitute the conditions in these mountains at the time of deposition of the sediments. The present study gives the results of a sedimentological investigation of the Tertiary and Quaternary deposits in a part of the Duero basin, situated south of the Cordillera Cantabrica, which supplied the sediments. The aim was to determine both the conditions in the source area, and the environments in the area of deposition. The investigated area is situated in the province of Palencia, between the rivers Pisuerga and Carrión. The area being a part of the so-called Meseta, has a simple relief. Two levels at different heights can be distinguished. The higher level, páramo, is strikingly flat, the... |
| Tipo: Article / Letter to the editor |
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| Ano: 1959 |
URL: http://www.repository.naturalis.nl/record/505906 |
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