The pumpellyite mineral series
Published online by Cambridge University Press: 14 March 2018
Extract
The bluish-green epidote-like mineral, pumpellyite, was first described by Palache and Vassar (1925) from the copper-bearing amygdaloidal lavas of the Lake Superior region. It has since been reported from many parts of the world in rocks which have undergone low grades of metamorphism, especially types such as amygdaloidal spilites and diabases (Burbank, 1927; Waldmann, 1934; Tsuboi, 1936; Quitzow, 1935, 1936; Klein, 1939; Laeroix, 1942; Seether, 1942; Zavaritsky, 1944:; Korzhinsky, ]944; de Roever, 1947a, b; Kvasha, 1950) and in glaueophane-schists and even eclogites in which pumpellyite is often associated with lawsonite (Irving, Vonsen, and Gonyer, 1932; Quitzow, 1935, 1936 ; Lacroix, 1942 ; Switzer, 1945 ; de Roever, 1947a, b, 1950). W. P. de Roever (1947a, 1950) has suggested a pumpellyitic facies of metamorphism as a lower-grade equivalent of his lawsoniteglaucophane subfacies, characterized by high confining pressure, but subordinate shearing stress and thermal influence, and passing into unmetamorphosed rocks.
- Type
- Research Article
- Information
- Mineralogical magazine and journal of the Mineralogical Society , Volume 30 , Issue 221 , June 1953 , pp. 113 - 135
- Copyright
- Copyright © The Mineralogical Society of Great Britain and Ireland 1953
References
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