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Calc-silicate xenoliths occur as part of a xenolith and autolith swarm in the Lower Zone of the Kiglapait Intrusion, Labrador. All xenoliths are lighter-colored than the local troctolite host rock, and are surrounded by a 1-2 cm thick reaction zone of clinopyroxenite. The typical mineral assemblage in calc-silicate xenoliths is diopside + forsterite + monticellite + spinel, and one also contains åkermanite. Reaction zones are dominated by diopside and spinel. All clinopyroxene compositions are “fassaitic,” with high concentrations of Al 2 O 3  (4-12 wt%), TiO 2  (1-4 wt%), and calculated Fe 2 O 3  (Fe 3+  &gt; Fe 2+ ). In addition, clinopyroxene grains locally display extreme zoning in Si, Al, Ti, and X Mg . Åkermanite contains up to 1.5 wt% Na 2 O.

High-temperature contact metamorphism of calc-silicate xenoliths in the Kiglapait Intrusion, Labrador