Re-os dating arsenopyrit

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A stunner

(28)
A stunner
Biography
Gender:
Female
Age:
28
Ethnicity:
Indian
Nationality:
A stunner
Hair color:
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Weight:
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Degao Zhai, Anthony E. Economic Geology ; 5 : — Native gold is intergrown with molybdenite and pyrite in auriferous quartz veins hosted by a monzogranite-monzonite stock and locally by Proterozoic gneiss, thereby offering an excellent opportunity to directly date the mineralizing event. Uranium-Pb age determinations for zircon yielded ages for the monzogranite and monzonite of Numerous mafic to felsic dikes, which are crosscut by ore veins pre-ore , parallel to these veins possibly synore , or crosscut by them post-ore , were carefully examined and dated.

The Archean-Proterozoic craton of West Africa hosts numerous gold deposits, which are spatially and temporally related to the Eburnean orogeny that took place between and Ma, and included multiple deformation events. The majority of these gold deposits are located along shear zones. The structural history is relatively well established for most gold deposits, but absolute timing of the mineralization is commonly lacking. Gold mineralization was structurally characterized at each deposit, and dated by the Re-Os method on pyrite, arsenopyrite, and pyrrhotite grains that were coeval with the gold deposition. Combined structural and Re-Os geochronological constraints allow two groups of gold deposits to be distinguished. Early orogenic gold formed during the Eoeburnean orogeny, i. These Re-Os ages on the early sulfides at Wassa and Kiaka are significant because they definitively provide the first direct age constraints on gold-only Eoeburnean mineralization in the Birimian of West Africa.

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This mineral is of particular interest because it is commonly associated with Au deposits and may be directly associated with Au deposition. Early success in Re-Os dating of arsenopyrite, as a means to determine the age of Au mineralization at Bendigo-Australia Arne et al. These deposits, however, are all of Phanerozoic age, whereas much of the world's Au is found in Archean rocks. The Au-bearing veins occur within shear zones showing evidence of reworking associated with the Central Indian Tectonic Zone, traceable across the Indian peninsula.

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