Compositional evolution of high-temperature sheared Iherzolite PHN 1611

Details Compositional evolution of high-temperature sheared Iherzolite PHN 1611 Compositional evolution of high-temperature sheared Iherzolite PHN 1611

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57..605s&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 57, no. 3, p. 605-613.

Computer Science

3

Earth Mantle, Geochemistry, Mineralogy, Peridotite, Garnets, Olivine, Pyroxenes, Trace Elements

Scientific paper

The evolution of fertile mantle was studied by proton microprobe (PIXE) analysis of minerals of a high-temperature sheared xenolith form the Thaba Putsoa kimberlite in Lesotho. Minerals analyzed included Ni, Cu, Zn, Ga, Sr, Y, and Zr. Compositional gradients in peridotite xenoliths provide insight into the compositional evolution of the mantle and constrain the processes of peridotite enrichment and thermal history. Compositional zonation, intercrystalline gradients, and bulk chemistry of PHN 1611 are discussed. Infiltration of a silica-unsaturated melt is documented by enrichment of Zr, Y, and Fe in garnet rims. High Fe compositions indicate that the metasomatic melt did not infiltrate through typical mantle and steep concentration gradients of Zn and Fe show that the xenolith was sampled from near a melt conduit. Concentration gradients found in olivine and clinopyroxene composition show that mechanical mixing may have occurred concurrently with melt infiltration. Mantle temperature changes occurred before or over a longer period than melt infiltration. Enrichment processes may have produced xenolith compositions similar to those proposed for primitive mantle but have different implications for mantle evolution.

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