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i List of Tablesiv List of Figuresv Introduction1 Shock processing of chondrites and the potential utility of metallic minerals6 Methods15 Samples15 Optical Microscopy17 Electron Microprobe Analyses17 Scanning Electron Microscopy18 Cooling Rate Measurements: Dendrites19 Closure Temperature Estimates: Zoned Kamacite-Taenite Structures19 Results and Discussion21 General Petrography21 Metal Textures and Compositions26 Dendritic Cooling Rates38 Central Ni in Taenite Cooling Rates40 Phosphorus Enrichment in Metals42 Nickel Enrichment in Troilite 49 Metal Textures and Their Significance 55 Overall variation in Metal Grain Compositions66 iii Presence of Carbide Grains74 Conclusions80 NWA 486080 NWA 657981 NWA 645482 NWA 658083 NWA 596485 Summary88 References91

Complex Thermal Histories of L Melt Breccias NWA 5964 and NWA 6580