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Distribution of rhenium in molybdenites from Japan

Published on Jan 1, 1971in Geochemical Journal0.99
· DOI :10.2343/geochemj.4.123
Kikuo Terada15
Estimated H-index: 15
(Kanazawa University),
Susumu Osaki3
Estimated H-index: 3
(Kanazawa University)
+ 1 AuthorsToshiyasu Kiba16
Estimated H-index: 16
(Kanazawa University)
Abstract
The rhenium contents of about 200 molybdenites have been determined by the neutron-activation or the catalytic spectrophotometric analyses. The present authors developed these methodes for the determination of the rhenium content of a very wide range, taking only a small amount of each sample. The data obtained show that 1) the rhenium content of molybdenite covers the range from 10-8 to 7 × 10-3 in atomic ratio of Re/Mo, 2) the rhenium contents generally decrease with the following order of occurrence of the molybdenites: volcanic sublimate, porphyry copper deposits, contact-metasomatic deposits, disseminated deposits and quartz veins, 3) as far as plutonic type of molybdenites are concerned, rhenium increases generally with decrease in estimated temperature of molybdenite deposition, 4) the rhenium contents of the molybdenites from Daito area, Shimane Prefecture.as a whole are contrary to the above rule and are higher than those from similar deposits in other areas, 5) low rhenium contents are found in cavity molybdenites, 6) rhenium in an euhedral crystal of molybdenite shows a regular distribution which obeys the Doerner-Hoskins' law, indicating that rhenium forms a solid solution with molybdenum.
  • References (15)
  • Citations (28)
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Abstract A method for the determination of rhenium in molybdenite is described for concentrations down to 10 −7 g/g. Separation of microgram quantities of rhenium from molybdenite is effected by a pyridine solvent extraction and the rhenium concentration determined by stable isotope dilution. Rhenium determinations were made on molybdenite specimens sampled at various localities throughout the Australian continent. Their rhenium concentration cannot be correlated to geographical distribution, ge...
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#1Kikuo Terada (Kanazawa University)H-Index: 15
#2Yukio Yoshimura (Kanazawa University)H-Index: 1
Last. Toshiyasu Kiba (Kanazawa University)H-Index: 16
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Abstract A neutron-activation method is described for the determination of rhenium in molybdenite. Radiochemical separation by a carrier technique was carried out very rapidly by means of successive liquid-liquid extraction processes. The recovery of rhenium, which was determined by a spectrophotometric method, was about 93%. About 10 samples could be analysed within 6 hr in parallel runs.
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#1Luigi Paganelli (UNIBO: University of Bologna)H-Index: 6
Abstract Determinations of rhenium content in some Italian molybdenites were made by a colorimetric method. It seems possible that the rhenium content may be correlated to the deposit formation temperature.
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チオシアン酸によるモリブデンの発色は不安定で,高品位のモリブデン鉱石中のモリブデンの定量には適さない.しかし,モリブデンを含む溶液に硫酸10mlを加え,硫酸白煙が発生しはじめるまで加熱したのち約60mlにうすめ,過塩素酸2ml,鉄(III)2mg,チオシアン酸アンモニウム溶液(10%)10ml,塩化第一スズ溶液(10%)0.5mlを加えて100mlにうすめ,モリブデンを発色させると全く発色が安定した.これを利用して1.9~2.7mgのモリブデンを示差法によって光度定量し,正確な結果を得た.この方法をモリブデン鉱石中のモリブデンの定量に応用して好結果を得た.簡便かつ迅速な方法である.
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