Shane Reeves

TL;DR: In this article, the sulfide melt-silicate melt partition coefficients for Ir and Pd have been determined from experiments run in a piston-cylinder apparatus at 1450°C, 8 kbar and under ƒ O 2 ǫ S 2 conditions appropriate for mafic magmas.

TL;DR: In this paper, an X-ray fluorescence pressed powder pellet technique (PPP) was extended to include additional elements and complemented by a full major and trace element calibration by fused glass disc (FGD) X-Ray fluorescence.

Abstract: Samples from a ca 254 Ga layer rich in microkrystites (sand-size spherules of former silicate melt) in the Hamersley Group (Western Australia) are enriched in Ir up to 50 fold over associated carbonates and shales, but few of the other siderophile elements display significant anomalies or chondritic interelement ratios However, similar concentrations and interelement ratios are observed in ejecta from the ca 590 Ma Acraman impact structure and have been attributed to diagenetic redistribution The microkrystite layer also contains sand-size quartz grains with internal textures typical of regionally metamorphosed rocks rather than evidence of shock metamorphism We suggest that the microkrystites were created by an impact that took place in a deep ocean basin rather than on a continent, and that the associated quartz is epiclastic detritus brought in by unusually high energy waves and/or currents, not as ballistic ejecta

TL;DR: In this article, an X-ray fluorescence pressed powder pellet technique (PPP) was extended to include additional elements and complemented by a full major and trace element calibration by fused glass disc (FGD) X-Ray fluorescence.

TL;DR: In this paper, an integrated petrological and geochemical examination of metasedimentary assemblages associated with mesothermal lode gold mineralization in five major centers of past and present production (Ballarat, Percydale, Tarnagulla, Maldon, Fosterville) in central Victoria, Australia, reveal that hydrothermal alteration in the hosting Cambro-Ordovician turbidites is much more pronounced and extensive than has previously been recognized.