Sillimanite-garnet-biotite-quartz-plagioclase gneiss

Title

Sillimanite-garnet-biotite-quartz-plagioclase gneiss

Identifier

AD-4

Description

The predominant lithology of the Peck Lake Formation is a sillimanite-garnet-biotite-quartz-oligoclase gneiss with pods and lenses consisting of two feldspars and quartz (anatectic?). The lithology is widespread throughout the Adirondacks and may represent a metapelite or metagraywacke. European geologists have referred to similiar lithologies as "kinzigites" (deWaard, 1962).
Thin section shows sillimanite, quartz, biotite and plagioclase.

Date

1980

Contributor

Western Minerals Inc.

Spatial Coverage

Adirondack Highlands--collected form a road cut on Route 29A approximately 5 miles north of Canada Lake Store, directly across from the Canada Lake Rod and Gun Club entrance.

Temporal Coverage

Precambrian

Accrual Method

Purchased from Western Minerals Inc.

Unit

Peck Lake Formation

Number of Thin Sections

1

Geolocation