These data suggest the presence of a mantle-derived component in the ore system that was probably introduced during the generation of the granitoid magmas.
These new timing and source constraints provide important new insight into the generation of this giant gold deposit, and they necessitate reexamination of genetic models for Muruntau and potentially other giant “orogenic gold” deposits worldwide.
Arsenic trioxide can be generated via routine processing of arsenic compounds including the oxidation (combustion) of arsenic and arsenic-containing minerals in air.
Illustrative is the roasting of orpiment, a typical arsenic sulfide ore.
Most arsenic oxide is, however, obtained as a volatile by-product of the processing of other ores.
For example, arsenopyrite, a common impurity in gold- and copper-containing ores, liberates arsenic trioxide upon heating in air.
Arsenopyrite crystallizes in the monoclinic crystal system and often shows prismatic crystal or columnar forms with striations and twinning common.
Ore minerals investigated in detail include molybdenite, pyrite and arsenopyrite which have been applied to understand the origin of porphyry, Sed Ex, VMS, IOCG and Orogenic Au deposits globally.
Some key papers include: Using Re-Os isotopes to determine the deposition age of petroleum source-rock formation (organic-rich shales) is a major research theme, both in terms of technical development and application.
Development of Re-Os geochronology for crustal matrices has been ongoing since 1998 in the laboratory.
This work has resulted in major advancements in the direct isotopic dating of crustal sulfide minerals, petroleum source-rocks, and natural hydrocarbons, using Re-Os isotopes.