Abstract

Ophicarbonates of the Feragen Ultramafic Body, central Norway

Highlights

  • There is a multitude of geological settings, fluids and temperatures at which ultramafic rocks are carbonated

  • The carbonation of ultramafic rocks is a significant part of the hydrothermal circulation in the oceanic crust (Beard & Hopkinson, 2000; Ludwig et al, 2006)

  • Major element compositions were measured by wavelength-dispersive spectrometry (WDS) with a Cameca SX 100 electron microprobe (Department of Geo­sciences, University of Oslo, Norway), using an acceleration voltage of 15 kV and beam currents between 10 and 20 nA

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Summary

Introduction

There is a multitude of geological settings, fluids and temperatures at which ultramafic rocks are carbonated. The carbonation of ultramafic rocks is a significant part of the hydrothermal circulation in the oceanic crust (Beard & Hopkinson, 2000; Ludwig et al, 2006). Bernoulli & Weissert (1985) distinguished two main types of carbonate in ultramafic rocks: sedimentary carbonates, and carbonate cement crystallised directly from pore fluid. According to these authors, the analysis of present-day formation of ophicarbonates has shown

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