The Geology of the Fox Islands Maine a Contribution to the Study of Old Volcan
The Geology of the Fox Islands Maine a Contribution to the Study of Old Volcan
George Otis Smith
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In the lighter band and lenses, the crystal- lization is coarser and less definite in structure, although spheru- Jitic in part. Some areas of quartz and epidote occur, and are doubtless of secondary origin. The spherulites and the web-structure seem to represent inter- growths of mineral fibers which crystallized within the lava, later than the trichites and other crystallites, but before consolidation. Their parallel arrangement may have been determined by chemi- cal or physical differences a...long definite planes, while the more intricate flow-lines traced by the crystallites are the result of movement in the lava. In certain areas in these rocks, the crystallization is of a more granular character and these rather in- 48 GEOLOGY OF THE FOX ISLANDS. definite mosaics of quartz and feldspar may have originated through devitrification of original glassy portions of the rock. The spherulitic aporhyolites are closely related to the taxitic, and gradations are found between the two types. The spherulites vary in abundance and in size, a few small ones, the size of a pin- head or of a pea, occurring- disseminated through the variegated purple or dark gray rock, or, on the other hand, the spherulites being- in great abundance, often completely covering- the exposed surfaces, and attaining- a size of several inches in diameter.
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