Devin L . Schrader

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Carbonaceous chondrites are meteoritic fragments of asteroids that avoided the geological reprocessing of larger planets and allow laboratory probing of early solar-nebula materials. Among these, Renazzo-type (CR) chondrites found in Antarctica appear remarkably pristine and are distinguished by abundant organic materials and water-soluble molecules such as(More)
Introduction: The study of primitive carbonaceous chon-drites is an important means of understanding the conditions of the early Solar System. We report new data on the Antarctic find RBT 04133, originally classified as a CR2 carbonaceous chon-drite [1]. However, we show that RBT 04133 is not a CR and has affinities to the CV and CO carbonaceous chondrite(More)
Sacramento Wash 005 (SaW) 005, Meteorite Hills 00428 (MET) 00428, and Mount Howe 88403 (HOW) 88403 are S-rich Fe,Ni-rich metal meteorites with fine metal structures and homogeneous troilite. We compare them with the H-metal meteorite, Lewis Cliff 88432. Phase diagram analyses suggest that SaW 005, MET 00428, and HOW 88403 were liquids at temperatures above(More)
Introduction: The N2 molecule is isoelectronic to CO, and exhibits a similar band system to CO in the VUV. The resolved rovibronic structure and very strong bands make N2 a plausible candidate for self-shielding, even though it is an order of magnitude less abundant than CO in a gas of solar composition. The discovery of very large N enrichment in lithic(More)
CRACKED EGG. S. A. Sweeney Smith; H. C. Connolly, Jr.; C. Ma; G. R. Rossman; J. R. Beckett; Denton S. Ebel; Devin L. Schrader; Dept. of Geology, Carleton College, Northfield, MN 55057, (sweeneys@carleton.edu); Dept. of Physical Sciences, Kingsborough Community College of CUNY Brooklyn, NY 11235 and Earth and Environmental Sciences, The Graduate Center of(More)
Here, we report the mineralogy, petrography, C-N-O-stable isotope compositions, degree of disorder of organic matter, and abundances of presolar components of the chondrite Roberts Massif (RBT) 04133 using a coordinated, multitechnique approach. The results of this study are inconsistent with its initial classification as a Renazzo-like carbonaceous(More)
REVEALED BY TRANSMISSION ELECTRON MICROSCOPY. D. L. Schrader, T. J. Zega, D. S. Lauretta, and H. C. Connolly Jr. Univ. of Arizona, Lunar and Planetary Laboratory (LPL), Tucson, AZ 85721, USA, (schrader@lpl.arizona.edu), Materials Science and Technology Division, Naval Research Laboratory, Code 6366, 4555 Overlook Ave. SW., Washington DC, 20375, Dept.(More)
Introduction: A primary goal of meteoritics is to determine the physical and chemical environments in the early solar system that led to the properties of planets and other solid bodies. Since metal is highly reac-tive in oxidizing and sulfidizing atmospheres, it and its corrosion scales can record the composition and conditions of any alteration fluid that(More)
IMAGING OF INSOLUBLE ORGANIC MATTER. J. Davidson, H. Busemann, C. M. O’D. Alexander, L. R. Nittler, D. L. Schrader, F. R. Orthous-Daunay, E. Quirico, I. A. Franchi, and M. M. Grady, PSSRI, The Open University, Milton Keynes MK7 6AA, UK, j.davidson@open.ac.uk, Department of Terrestrial Magnetism, Carnegie Institution of Washington, DC, USA, University of(More)
ALTERATION IN TYPE-II CHONDRULES IN THE CR CARBONACEOUS CHONDRITES. D. L. Schrader, D. S. Lauretta, and H. C. Connolly Jr. Univ. of Arizona, Lunar and Planetary Laboratory (LPL), Tucson, AZ 85721, USA, Dept. Physical Sciences, Kingsborough Community College of CUNY, USA and Dept. Earth and Environmental Sci., The Graduate Center of CUNY, Dept. Earth and(More)