Relative abundances of chondrule primary textural types in ordinary chondrites and their bearing on conditions of chondrule formation

Details Relative abundances of chondrule primary textural types in ordinary chondrites and their bearing on conditions of chondrule formation Relative abundances of chondrule primary textural types in ordinary chondrites and their bearing on conditions of chondrule formation

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981metic..16...17g&link_type=abstract

Meteoritics, vol. 16, Mar. 31, 1981, p. 17-43.

Mathematics

Logic

126

Abundance, Chondrites, Chondrule, Meteoritic Composition, Petrography, Evolution, Olivine, Photomicrography, Pyroxenes, Surface Properties, Tieschitz Meteorite, Dhajala Meteorite, Ochansk Meteorite, Ll Chondrites, Weston Meteorite, Bishunpur Meteorite, Hallingeberg Meteorite, Features, Saratov Meteorite, Tennaslim Meteorite, Chainpur Meteorite, Comparisons, Semarkona Meteorite, Hamlet Meteorite, Soko-Banja Meteorite, H Chondrites, Ngawi Meteorite, Meteorites, Abundance, Chondrules, L Chondrites, Data, Ordin

Scientific paper

A petrographic survey of > 1600 chondrules in thin-sections of 12 different mildly to highly unequilibrated H-, L-, and Li-chondrites, as well as morphological and textural study of 141 whole chondrules separated from 11 of the same chondrites, was used to determine the relative abundances of definable chondrule primary textural types. Percentage abundances of various chondrule types are remarkably similar in all chondrites studied and are ˜47-52 porphyritic olivine-pyroxene (POP), 15-27 porphyritic olivine (P 0), 9-11 porphyritic pyroxene (PP), 34 barred olivine (BO), 7-9 radial pyroxene (RP), 2-5 granular olivine-pyroxene (GOP), 3-5 cryptocrystalline (C), and ≥ 1 metallic (M). Neither chondrule size nor shape is strongly correlated with textural type. Compound and cratered chondrules, which are interpreted as products of collisions between plastic chondrules, comprise ˜2-28% of non-porphyritic (RP, GOP, C) but only ˜2-9% of porphyritic (POP, PO, PP, BO) chondrules, leading to a model-dependent implication that non-porphyritic chondrules evolved at number densities (chondrules per unit volume of space) which were 102 to 104 times greater than those which prevailed during porphyritic chondrule formation (total range of ˜1 to ˜106 m-3. Distinctive "rims" of fine-grained sulfides and/or silicates occur on both porphyritic and non-porphyritic types and appear to post-date chondrule formation. Apparently, either the same process(es) contributed chondrules to all unequilibrated ordinary chondrites or, if genetically different, the various chondrule types were well mixed before incorporation into chondrites. Melting of pre-existing materials is the mechanism favored for chondrule formation.

Affiliated with

Also associated with

No associations

Rating

Relative abundances of chondrule primary textural types in ordinary chondrites and their bearing on conditions of chondrule formation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Relative abundances of chondrule primary textural types in ordinary chondrites and their bearing on conditions of chondrule formation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Relative abundances of chondrule primary textural types in ordinary chondrites and their bearing on conditions of chondrule formation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1038512