A relict-grain-bearing porphyritic olivine compound chondrule from LL3.0 Semarkona that experienced limited remelting

Identification of Feo-rich Relict Olivines in Type Iia Chondrules Using Fe-mn

Introduction: Relict grains (i.e., grains that did not crystallize in situ from the host chondrule melt) provide a real physical record of chondrule precursor grains. Most relicts appear to be derived from previous generations of chondrules and hence represent evidence for recycling of material in the chondrule forming region(s). [1] estimated that at least 15% of chon-drules contain material t...

Shock Features in Acapulcoites and Lodranites: Implications for the Origin of Primitive Achondrites

Introduction. Acapulcoites and lodranites constitute two related groups of " primitive achon-drites " [1-3] that possess recrystallized textures, chondritic mineralogy, planetary-type rare gases, and approximately chondritic bulk compositions. They are widely considered to have formed by partial melting of chondritic material [4-10]. Although Kallemeyn and Wasson [11] suggested that acapulcoite...

Identification of Relict Forsterite Grains in Forsterite-rich Chondrules

Introduction: Many chondrules clearly contain relict grains that result from incomplete melting of precursor material. Most discussions of relict grains have focused on grains that are easy to identify because they have compositions significantly different from their host chondrules, including forsterite in type II chondrules and dusty olivine in type I chondrules [1]. However, in order to full...

Constraints on the Oxidation State of Chondrule Precursors from Titanium Xanes Analysis of Semarkona Chondrules

Oxygen Isotopic Composition of Renazzo Chondrule Olivine and Comparison with Extent of Chondrule Melting

WITH EXTENT OF CHONDRULE MELTING. L.R. Varley, L.A. Leshin, Y. Guan, B. Zanda, and M. Bourot-Denise, Dept. of Geological Sciences, Arizona State University, PO Box 871404, Tempe, AZ , 85287-1404 ([email protected]), Center for Meteorite Studies, ASU,. Geological Sciences, Rutgers University, Piscataway, NJ, 08855-1179, Laboratoire de Minéralogie, Muséum d’Histoire Naturelle, 75005 Paris, France.