Origin of Fayalitic Olivine Rims and Plate-like Matrix Olivines in the CV3 Chondrite Allende

Details Origin of Fayalitic Olivine Rims and Plate-like Matrix Olivines in the CV3 Chondrite Allende Origin of Fayalitic Olivine Rims and Plate-like Matrix Olivines in the CV3 Chondrite Allende

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..711k&link_type=abstract

Lunar and Planetary Science, volume 27, page 711

Mathematics

Logic

3

Alteration: Aqueous, Dehydration, Fayalitic Olivine, Nepheline

Scientific paper

We suggested earlier that nearly all of the matrix and the margins of chondrules in Allende were converted to phyllosilicates which were subsequently dehydrated. To test this model, we have studied two moderately altered (Type B,) Allende dark inclusions and Allende host by optical microscopy, scanning electron microscopy and electron microprobe analysis. We infer from our new data that hydrothermal alteration of dark inclusions after accretion caused various degrees of replacement of the original matrix material, chondrule rims, chondrules and isolated forsterite grains by phyllosilicates, formation of secondary sulfide rims around replaced chondrules and isolated forsterite grains, and redistribution of Ca, Fe, Mg, Si, Na, and Mn. Subsequent dehydration of phyllosilicates (saponite and serpentine) produced fayalitic olivine rims around forsterite grains, plate-like olivines and anhedral nephline grains which typically enclose plate-like fayalitic olivines in matrix, chondrule rims and replaced portions of chondrules and forsterite grains. Veins consisting of fayalitic olivine, hedenbergite and andradite were formed at the same time. The compositional, textural and mineralogical similarities between fayalitic olivine rims and matrix olivine in dark inclusions and Allende host and the presence of fayalitic veins in Allende confirm our earlier suggestion that Allende experienced hydrothermal alteration and subsequent dehydration.

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