Amphiboles and biotite in relation to the stages of metamorphism in granogabbro

1974/12/01 by W. Smulikowski

paper · doi:10.1180/minmag.1974.039.308.05

crossref issued 1974/12/01 · crossref published 1974/12/01 · crossref published-print 1974/12/01 · crossref created 2006/12/18 · crossref published-online 2018/07/05 · crossref deposited 2021/02/05 · crossref indexed 2026/07/30

Abstract

Summary The Bratteggdalen granogabbro, a relict mass in the Caledonian amphibolites of Vestspitsbergen, shows a series of amphibole development reflecting its thermal history. A brown Ti-rich hornblende occurs as a late magmatic mantling of pyroxene. Low-grade metamorphism (greenschist facies) was accompanied by the development of actinolite from pyroxene; subsequent amphibolite facies metamorphism saw the development of an alkali-rich, blue-green hornblende. The chemical changes in the amphiboles are a succinct illustration of those found in progressive regional metamorphism.

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