Guides d'excursions au Canada1-10 . ereby le calcaire est converti en amphibolite, isobrièvement comme suit:— La série sédimentaire, consistingprincipalement de calcaires interstratifiés avec des amphibolites, thésème composant environ la moitié du volume de thélabre, est envahie par les batholithes de granit, déchirée à pieceset dispersée sous forme de fragments à travers la roche envahissante.Ces fragments sont tous composés d'amphibolite, et aucun composé de calcaire ne peut être trouvé. La persistance de ce phénomène dans toute la zone suggère l'analgésie du calcaire à l'amphibolite. 30 à certains endroits,

• Contributeur: The Reading Room / Alamy Banque D'Images
• ID de l’image: 2AXJN4R
• Taille du fichier: 7,1 MB (594,1 KB Téléchargement compressé)
• Autorisations: Modèle - non | Propriété - non
• Dimensions: 1781 x 1402 px | 30,2 x 23,7 cm | 11,9 x 9,3 inches | 150dpi

Informations supplémentaires

Cette image appartient au domaine public, ce qui signifie que le droit d’auteur a expiré ou que le titulaire du droit d’auteur a renoncé à ses droits. Les frais facturés par Alamy couvrent l’accès à la copie haute résolution de l’image.

Cette image peut avoir des imperfections car il s’agit d’une image historique ou de reportage.

Guide books of excursions in Canada1-10 . ereby the limestone is converted into amphibolite, isbriefly as follows:—The sedimentary series, consistingchiefly of limestones interstratified with amphibolites, theformer making up about one-half of the volume of thewhole, is invaded by the granite batholiths, torn to piecesand scattered as fragments through the invading rock.These fragments are all composed of amphibolite, andnone consisting of limestone can be found. The persistenceof this phenomenon throughout the whole area suggests analteration of limestone to amphibolite. 30 In certain places, especially about the border of theGlamorgan batholith, where the line of contact is especiallywell exposed for study, a gradual passage of the limestoneinto amphibolite can actually be observed, the former rockhaving gradually developed in it feldspars, hornblende andpyroxene in progressively greater amount, until it event-ually becomes an amphibolite. A detailed description ofthis form of alteration, with a chemical and mineralogical. Limestone passing into pyroxene gneiss and amphibolite cut by granite. Southernborder of Glamorgan batholith, Maxwells Crossing. study of the transitional rocks, will be found in the reporton the geology of the Haliburton and Bancroft areas towhich reference has already been made. (See also pp.63-73 of this Guide Book.) Evidences of alteration of the third class are lessfrequent and less striking. Nevertheless, in certain casesit appears to be practically certain that there has been adistinct solution of the invaded rocks by the granite. This, 3i however, probably took place on a comparatively smallscale. An occurrence of this kind is found on the southernextension of Kasshabog lake, in the township of Methuen.Here the banded amphibolite is invaded by the granite-gneiss, which has broken it into fragments and partlydissolved some of them, giving rise to a greyish, streaky-looking mass of irregular composition, much lighter incolour than the am

Recherche dans la banque de photos par tags

• bookcentury1900
• bookdecade1910
• booksubjectgeology
• bookyear1913