Large chondrules and lithic clasts in Julesberg (L3) and other ordinary chondrites - Bulk-chemical characterization

Details Large chondrules and lithic clasts in Julesberg (L3) and other ordinary chondrites - Bulk-chemical characterization Large chondrules and lithic clasts in Julesberg (L3) and other ordinary chondrites - Bulk-chemical characterization

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28.1217r&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 217.

Computer Science

Chondrites, Chondrule, Chemical Properties, Igneous Rocks, Hypervelocity Impact, Aluminum Compounds, Metamorphism (Geology), Petrography, Calcium Compounds

Scientific paper

Igneous-textured objects much larger than typical chondrules have been described in many ordinary chondrites. These objects may be (1) large variants of normal-sized chondrules, known as megachondrules, (2) impact melts of chondritic material, or (3) igneous differentiates. We have performed a systematic petrographic-chemical study of large 'melt' objects, focussing on one weakly-metamorphosed chondrite, the Julesberg L3. The large melt objects we have studied can be subdivided into two groups based on shapes, textures, and phase compositions, including (1) large, Na-poor lithic clasts and megachondrules, and (2) large, Na-rich clasts. In this abstract, we describe the bulk compositions of objects in these two groups. We conclude that the objects in these two groups formed by fundamentally different processes. The same two groups appear to be present in normal-sized chondrules and clasts in ordinary chondrites.

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