Identifier: newyorkstatemu1921917newy (find matches)
Title: New York State Museum bulletin
Year: 1916 (1910s)
Authors: New York State Museum
Subjects: Science
Publisher: Albany, N.Y. : University of the State of New York
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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ccur in the rock along the lake shore south of theanorthosite-gabbro. The Triplet Hill mass is probably only a westward extension,under the lake, of the area last described, the rock being very simi-lar though at the summit of the hill some of the rock is rather dis-tinctly porphyritic. A very small body of basic syenite shown on the map northeastof Long Lake village is only a wide band parallel to the foliationof the syenite and not sharply separated from it. The rock is ofdecided igneous aspect, rather hornblendic and with occasionalgarnets up to more than an inch across. Apparently this rock hasbeen produced by the assimilation of some Grenville hornblende-garnet gneiss by the syenite magma. The rock bears a very closeresemblance to a definitely proved assimilation product of this sortat the garnet mine on Gore mountain near North Creek in Warrencounty. Granitic syenite. The granitic syenite is really only an acidicphase of the syenite in which the quartz content lies approximately
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GEOLOGY OF THE BLUE MOUNTAIN QUADRANGLE 2/ between 20 and 25 per cent. So far as could be determined in thefield, this granitic syenite is intermediate between the normal syeniteand the granite, always grading into one or the other or both.Nothing like definite evidence was obtained to show that any oneof these rock types cuts another. Though any attempt separatelyto delimit the granitic syenite on the geologic map must be ratherarbitrary, it is believed that, as a result of careful attention tothe matter in the field and the study of thin sections, the arealrelation of the granitic syenite to the normal syenite and thegranite are fairly well brought out. • This granitic syenite occupies nearly one-third of the area of thequadrangle and, like the normal syenite, is widely distributed inver)^ irregular shaped bodies. Much of the rock shows the usual color of the normal syenite, butpinkish to reddish granitic syenite is not uncommon, thus suggest-ing the typical granite into which it

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