Mo isotope composition in Mo-rich high- and low-T hydrothermal systems from the Swiss Alps

Isotope Fractionation Processes of Selected Elements

“…According to Mathur et al (2010a, b) Mo isotope variations depend on the type of ore deposit; molybdenites from porphyry coppers have lighter Mo isotope composition relative to other ore deposits. Greber et al (2011) observed isotope variations of 1.35 ‰ in a single molybdenite deposit which is larger than the overall Mo isotope variation in igneous rocks. By analysing molybdenites from the well-known porphyry copper deposit of Questa, New Mexico, Greber et al (2014) subdivided three stages during which Mo isotope fractionations may occur, all lead to molybdenites being heavier than the magmatic source.…”

Fractionation of Cu and Mo isotopes caused by vapor-liquid partitioning, evidence from the Dahutang W-Cu-Mo ore field

“…Multiple studies have shown the Cu isotope composition of chalcopyrites and Mo isotope composition of molybdenites vary significantly throughout a mineral deposit that formed at high temperatures [ Asael et al ., ; Hannah et al ., ; Maher and Larson , ; Li et al ., ; Mirnejad et al ., ; Mathur et al ., , 2010b; Greber et al ., ; Mathur et al ., ; Greber et al ., ]. The trend seen between the Cu and Mo isotope compositions of the paired coexisting minerals (Figure ) further demonstrates that the both isotopes fractionate at high temperature.…”

Evidence for free oxygen in the Neoarchean ocean based on coupled iron–molybdenum isotope fractionation

“…Published d 98 Mo values of MoS 2 vary widely over a few per mil, but the average d 98 Mo value is 0.4& (Greber et al, 2011). Further evidence for the Mo composition of the Archean ocean is provided by the Mo isotope compositions of shale samples from the 3.2 Ga Fig Tree Group. These shales, which were likely deposited under anoxic conditions and therefore involved little to no oxide-related isotopic fractionation, have an average d 98 Mo value of 0.2& (Wille et al, 2007).…”