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Both galena and sphalerite have low and high variable Re concentrations and thus Re-Os dating of these minerals have been less promising.
In addition, the recovery of Re is extremely low for galena when conventional method was applied, lending additional difficulty in precisely dating galena.
Ores as old as 3,000,000,000 years and as young as 38,000,000 years have been dated this way.
The technique described in this paper represents the modification and combination of two previously existing methods, alkaline fusion and negative thermal ion mass spectrometry (NTIMS).
Rhenium–osmium dating, method of determining the age of the important ore mineral molybdenite; the method is based upon the radioactive decay of rhenium-187 to osmium-187.
The rhenium–osmium ratio in most minerals is too low to be of general use as a dating technique, but molybdenite (molybdenum disulfide, Mo S) has a very high ratio of rhenium to osmium; and workers have found that the osmium in molybdenite is practically pure radiogenic osmium-187.
In the Yangchuling mine area the small monzogranitic porphyry stock has stronger fractionation, volatile content and ore-forming components than the older granodiorite, resulting in the development of the porphyry W-Mo ore system.
The Dachang tin-polymetallic district, Guangxi, China, is one of the largest tin ore fields in the world.
Six molybdenite samples yielded a Re-Os weighted mean age of 146.4 ± 1.0 Ma.
Geochemical data show that both granodiorite and monzogranitic porphyry are characterized by enrichment of large ion lithophile elements (LILE) relative to high field strength elements (HFSE), indicating a peraluminous nature (A/CNK = 1.01-1.08).
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