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| Collée, A.L.G.. |
| The solution of the problem whether the ultrabasic inclusions in lavas are accumulation products of early crystallized minerals of the lavas in which they occur, or fragments of the earth’s peridotite shell carried to the surface by the eruptive force of the lavas, largely depends on the answer to the question whether these inclusions are tectonites or not. The structure of the specimens from Auvergne (France), which formed the main subject of this study, has been proved conclusively to be of a tectonic nature, from the macroscopically visible intersecting slip planes which are definitely younger than the banding of the specimen, as well as from microscopic evidence that suggests that both the olivine and enstatite crystals are concentrated in the... |
| Tipo: Article / Letter to the editor |
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| Ano: 1963 |
URL: http://www.repository.naturalis.nl/record/505921 |
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| Collée, A.L.G.. |
| During the field season of 1956 and 1957, an area in the NW part of the province la La Coruña was investigated. On the north the area is bounded by the Atlantic ocean, its southern boundary is formed by the roads: Beo-Malpica and Malpica-Buño. The Monte Neme forms the eastern limit of the mapped area. Formerly this area has been studied by Professor I. Parga-Pondal and L.T. Schoon. The results of these investigations served as a basis for this study. Along the coast a well exposed complete cross section through the Central complex can be studied. A part of the Lage formation is exposed at the ends of the cross section, viz. the augengneisses of the Cabo de San Adrian in the west and the migmatites of the Monte Neme in the east. Special attention has been... |
| Tipo: Article / Letter to the editor |
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| Ano: 1964 |
URL: http://www.repository.naturalis.nl/record/505827 |
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