Heymann, Dieter2016-04-222016-04-221968Taylor, G. Jeffrey, 1944-. "On the thermal history of chondrites." (1968) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/90081">https://hdl.handle.net/1911/90081</a>.https://hdl.handle.net/1911/90081In order to investigate shock and reheating effects in ordinary chondrites, 71 bronzite, 26 hypersthene, and 6 amphoterite chondrites were examined by X-ray diffraction and 39 bronzite and 19 hypersthene chondrites were studied metallographically. In addition, the inert gas contents of 12 bronzite and 4 hypersthene chondrites were measured mass spectrometrically. It was found that virtually all chondrite with short gas- retention ages (< 2 by.) are shocked and reheated, whereas chondrites with ages > 3 by. are not reheated to any appreciable extent, although some are heavily shocked. It is concluded that few, if any, severe collisions took place on the chondrite parent bodies between 3 and 4.5 by. ago. Moreover, the bronzite and amphoterite parent objects apparently escaped fragmentation, such as was suggested by Anders and Heymann for the hypersthene object.73 ppengCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.ThesisRICE1117reformatted digitalThesis Geol. 1968 Taylor