IRIDIUM ANOMALY ASSOCIATED WITH MAPCIS?
In 2017, a new line of investigation was opened as there is an Iridium anomaly associated with the Precambrian/Cambrian boundary. For the first time, this pseudotachylite breccia from the Musgrave province was assayed for Iridium as well as other PGEs. The samples from the Musgrave province along with samples of Pt. from the Sudbury Canada and Vredefort, SA impact sites were prepared at Virginia Commonwealth University to be assayed at Bureau Veritas Commodities Canada Ltd. The results showed an Iridium anomaly in the Musgrave pseudotachylite orders of magnitude higher than what would be expected from continental crust. The Iridium enrichment in the samples is consistent with an extraterrestrial source or possibly a mantle source. Further sampling and assaying may be needed to fully differentiate the source of the Iridium enrichment.
Although pseudotachylite breccias in central Australia are the largest known deposits on Earth, they are relatively unknown and unstudied. Samples were donated to the Australian Museum, Sydney, the South Australian Museum, Adelaide, the Queensland Museum, Brisbane and Naturhistorisches Museum, Vienna. These samples were the first of their kind in each museum collection. We hope to stimulate further research in this area.