Fayalite-ferrohedenbergite-mesoperthite granite

Title

Identifier

AD-21

Description

This granite post-dates deformation and metamorphism. Silver got a U/Pb zircon age of 1125 Ma. This is a most unusual rock type. This rock has small quantities of fayalitic olivine and ferrohedenbergite that occur with mesoperthite and quartz. It also contains iron-rich orthopyroxene (Fe~90%).
Thin section shows feldspar with perthitic texture, quartz and olivine.

Date

1980

Contributor

Western Minerals Inc.

Is Part Of

Anorthosite-Charnockite and Metamorphic Suite-Adirondack Mountains, New York

Spatial Coverage

Adirondack Highlands-collected from road cuts 4.1 miles west of Cranberry Lake.

Temporal Coverage

Precambrian

Accrual Method

Purchased from Western Minerals Inc.