Wollastonite from Hydrothermally Altered Basaltic Rocks in Iceland

H. Kristmannsdóttir
National Energy Authority, Hydrothermal Div., Grensásvegur 9, Reykjavik, Iceland

Abstract: Wollastonite is reported, for the first time in Iceland, in hydrothermally altered basaltic rocks in the Krafla high-temperature geothermal area, northern Iceland. Two possible modes of origin are suggested: (1) A contact metamorphic origin at the expense of hydrothermal quartz and calcite near the margins of dykes. (2) A hydrothermal origin at depths below 1000 m where fluid temperatures exceed 300 °C.

Mineralogical Magazine; March 1981 v. 44; no. 333; p. 95-99; DOI: 10.1180/minmag.1981.44.333.15
© 1981, The Mineralogical Society
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