Lherzolite Nodules in Basalts from British Columbia, Canada

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Abstract
Lherzolite nodules in basaltic rocks from three localities in British Columbia include metamorphic tectonites and crystal cumulates. Chemical analyses show that trace element concentrations and distribution coefficients differ from suite to suite. Distribution of iron and magnesium between coexisting phases is regular and characteristic of each suite. Distribution of iron and magnesium between spinel and olivine indicates temperatures of last equilibration of approximately 840 °C for the cumulate nodules from Nicola Lake, 1085 °C for the tectonite nodules from Jacques Lake, and in excess of 1600 °C for the tectonite nodules from Castle Rock. The fabric of the tectonites is ([Formula: see text] girdle) with the γ-maximum perpendicular to the plane of layering or foliation.

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