The paragenesis of zoned chromite from central Manitoba

Details The paragenesis of zoned chromite from central Manitoba The paragenesis of zoned chromite from central Manitoba

Jun 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975gecoa..39..973b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 39, Issue 6-7, pp.973-974

Computer Science

20

Scientific paper

Antigorite-bearing serpentinite bodies containing zoned grains of accessory chromite occur beneath Paleozoic sediments southwest of the Manitoba Nickel Belt. The chromite grains have dark, homogeneous cores surrounded by a lighter Al- and Mg-poor zone of ferritchromit that changes gradually in composition towards magnetite at the margin. It is shown that serpentinization of the peridotitic protolith of the serpentinite initially produced a lizardite septentinite in which some of the secondary magnetite formed rims on the primary chromite grains. Subsequent metamorphism to at least the epidote amphibolite facies produced antigorite from the lizardite, while the magnetite rims reacted with the chromite cores to produce the Aland Mg-poor ferritchromit zones. The Al and Mg released from the chromite were fixed in antigorite.

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