File:Annual report (1902) (14760842311).jpg

Identifier: annualreport190200onta (find matches)
Title: Annual report
Year: 1891 (1890s)
Authors: Ontario. Dept. of Mines
Subjects: Mines and mineral resources
Publisher: Toronto
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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has been noted asoccurring in nepheline sjsenite from different localities in eastern Ontario and Quebec. Thishas been thought by some to indicate that the nepheline syenite possessed some close geneticrelationship to the crystalline limestones with which it is usually found associated in the field.It seems to the writer, however, that the occurence of calcite or dolomite in both the nephelinesyenite and granite can be accounted for on the assumption that it was taken up by the latterrocks in the form of inclusions when the granite or syenite broke through the crystalline lime-stones. Conditions of pressure and temperature appear to be such as to have prevented thesolution or breaking up of the included calcite in the molten magmas. Calcite is found undersimilar conditions in trap dikes which cut the crystalline limestone of Barrie township. Hereit occurs not only in small or microscopic fragments in the igneous rock, but also in large frag-ments, several inches or a foot in diameter.
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blejenrtziremeind meae-:edtheme in St. tz,te. enanle-upcz.sis ce10-iatve»le

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