Structure and rock alteration at the Elizabeth mine, Vermont

Peter F. Howard*

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The Elizabeth copper mine in east-central Vermont is a concordant orebody lying within medium to high-grade metamorphic rocks of the Gile Mountain formation, believed to be Ordovician in age. The major structural features of the district are the east-dipping eastern limb of the Green Mountain anticlinorium, and the Strafford dome, which is marked by the development of an abnormal "Christmas-tree" pattern of minor folds. Due to a flat northerly plunge, the easterly part of this structure crops out as a series of recumbent dextral folds in which the older rocks appear on the inside of the northerly-plunging V structures. Minor sinistral folds and flexures are common in the area, and both pre- and post-date the dextral folds associated with the Strafford dome. The Elizabeth orebodies are bedded within the rock sequence at the contact of amphibolite and mica schists and are structurally related to the "Christmas-tree" pattern of folds. The ore is localized in fold positions and on straight limbs between fold positions. Schist breccia within the ore, ore infilling the space between parted bedding planes in drag fold positions, and veins filled with ore suggest that the ore was introduced into permeable zones formed during deformation and dated as middle and/or late Devonian (Acadian). It is believed that the major ore control in the district was the crushed and folded contact of thick competent amphibolite beds with incompetent schists interbedded with quartzites.

Original languageEnglish
Pages (from-to)1214-1249
Number of pages36
JournalEconomic Geology
Volume54
Issue number7
DOIs
Publication statusPublished - 1 Nov 1959
Externally publishedYes

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