Glass-rich chondrules in ordinary chondrites

Details Glass-rich chondrules in ordinary chondrites Glass-rich chondrules in ordinary chondrites

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29..697k&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 29, no. 5, p. 697-707

Computer Science

5

Chondrites, Crystals, Glass, Meteoritic Composition, Petrography, Aluminum, Calcium, Chemical Analysis, Electron Microscopy, Forsterite, Mineralogy, Tables (Data), Titanium

Scientific paper

There are two types of glass-rich chondrules in unequilibrated ordinary chondrites (OC): (1) porphyritic chondrules containing 55-85 vol% glass or microcrystalline mesostasis and (2) nonporphyritic chondrules, containing 90-99 vol% glass. These two types are similar in mineralogy and bulk composition to previously described Al-rich chondrules in OC. In addition to Si-, Al- and Na-rich glass or Ca-Al-rich microcrystalline mesostasis, glass-rich chondrules contain dendritic and skeletal crystals of olivine, Al2O3-rich low-Ca pyroxene and fassaite. Some chondrules contain relict grains of forsterite +/- Mg-Al spinel. We suggest that glass-rich chondrules were formed early in nebular history by melting fine-grained precursor materials rich in refractory (Ca, Al, Ti) and moderately volatile (Na, K) components (possibly related to Ca-Al-rich inclusions) admixed with coarse relict forsterite and spinel grains derived from previously disrupted type-I chondrules.

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