Conventional dating of molybdenite (187 Re-187 Os) provides one of few options for direct
dating of sulfide mineralization. Unfortunately, in situ dating of molybdenite is considered
unreliable due to intra-granular decoupling of 187 Re-187 Os. In this study, we developed a
new analytical protocol for studies of micron-to grain scale 187 Re-187 Os systematics in
molybdenite. Online chemical separation using ICP-MS/MS technology enables in situ
dating by β-decay systems (eg, Rb-Sr and K-Ca in micas) using laser ablation. Here, the …

Dating with the Re-Os isotopic system provides several advantages compared to
conventional chronometers such as Rb-Sr. Because of the sidero-and chalcophilic nature of
Re and Os, those can be found as trace elements in sulfides, meaning that ages can be
obtained for sulfide deposit, giving valuable information of ore genesis. To ensure the quality
of the analytical measurements needed in isotopic dating, a reference material with known
concentrations of Re and Os is necessary. The aim of this study is to develop a method to …