JMDMT #1977 Microfossils of Cyanobacteria in Carbonaceous Meteorites

The James M. DuPont Meteorite Collection – mobilization leading to the formation of sulfide rims around the metal grains, as shown in Fig. 1 (field of view = 125 micrometers). For comparison, Fig. 2 (field of view = 500 micrometers) shows a metal-sulfide assemblage from ALH-764. The experimental assemblage closely resembles the natural one. The metal in the experimental sample is completely surrounded by a sulfide rim and any initial voids in the metal are filled with sulfide. The original sulfide grains also underwent extensive changes. Sulfide crystal boundaries show evidence of S loss and large pores are present within the sulfide crystals. These experiments show that S is easily mobilized during metamorphic events as shown by [5] and that sulfide-rimmed metal grains in ordinary chondrites can result

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