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Highly precise Re-Os dating for molybdenite using alkaline fusion and NTIMS
Yang Wang 1 and Nianqiao Fang 1. Create citation alert. Buy this article in print.
Pt–Os. Isotopes. Dating. Geochronology. Bushveld. PGM. We evaluate the Pt–Os decay system, measured by laser ablation MC-ICPMS, as a useful.
Conventional dating of molybdenite Re- Os provides one of few options for direct dating of sulfide mineralization. Unfortunately, in situ dating of molybdenite is considered unreliable due to intra-granular decoupling of Re- Os. In this study, we developed a new analytical protocol for studies of micron- to grain scale Re- Os systematics in molybdenite.
Several reaction gases were evaluated, and production of OsCH 2 by reaction with CH 4 was found to produce strong separation of Os from Re. However, in contrast to the e. A mathematical correction of this remaining interference is possible, and Re- Os mass-shifted can be measured accurately even for fairly extreme ratios. For laser ablation, standards were developed by pressing particulate pellets of conventionally dated molybdenite Moly Hill and Merlin , because there are no appropriate reference materials available.
Two important implications of this result are that decoupling Re-Os is not universal, and that our new analytical protocol is useful both for dating and for studies of decoupling. However, dating of molybdenite is hindered by several analytical complications and is only performed in highly specialized labs. The main problem is that the mass difference between Re and Os cannot be resolved by mass spectrometry, and chemical separation of these isotopes is comparatively difficult.
Additionally, decoupling of Re and Os within molybdenite crystals has been reported, especially in older and coarser grains, which means that extra care has been urged in sample preparation Selby and Creaser ; Stein et al. Effective separation is possible because the daughter isotope reacts with a reaction gas and is measured in the so-called mass-shift mode, while the parent isotope does not react and is measured on-mass.
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Over the years, Chemostrat has expanded the services on offer to now include more advanced isotopic techniques that so far have been used only in academia. The information presented below briefly outlines how Chemostrat is utilising two of these techniques, i. Re and Os become concentrated in the organic, hydrogenous fraction of organic rich shales, thus the time when the shale was deposited can be dated. Furthermore, as Re and Os have been inherited from the source rocks, Os isotopes can be employed to correlate an oil with its source.
Despite this application mainly being associated with the economic extraction of minerals, it can be employed by the oil and gas industry to date the formation of disseminated sulphide minerals within basement rocks and so the basement itself.
The ReOs β-decay system habilitates direct dating of sulfide mineralization events, and is a critical tool for studies of ore–forming.
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Rhenium—osmium dating , method of determining the age of the important ore mineral molybdenite; the method is based upon the radioactive decay of rhenium to osmium The rhenium—osmium ratio in most minerals is too low to be of general use as a dating technique, but molybdenite molybdenum disulfide, MoS 2 has a very high ratio of rhenium to osmium; and workers have found that the osmium in molybdenite is practically pure radiogenic osmium Ores as old as 3,,, years and as young as 38,, years have been dated this way.
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Request PDF | Molybdenite Re-Os dating of biotite dehydration melting in the Rogaland high-temperature granulites, S Norway | The ability of the Re–Os system.
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While whole-rock peridotite Re-Os isotopic signatures are the core of such investigations, the Re-Os dating of individual peridotite minerals.
Goals This proposed work will extend laser ablation resonance ionization spectrometry LARIMS from the previously demonstrated rubidium-strontium Rb-Sr geochronology system to four other radiogenic systems, enabling in-situ, concordant age determinations to be made on extraterrestrial bodies in the solar system. Advantages include providing an independent test of concordance, while expanding the potential range of samples that can be successfully measured.
Testing for concordance is important because individual isotopic dating systems can be biased by a variety of factors. These biases are frequently distinct for different radiometric systems. Objectives This proposal addresses the important NASA goal to understand the history and evolution of the solar system. The time of key events in solar system history are poorly constrained by current samples, giving impetus to future missions with sample return and in-situ landed dating measurements.
An issue for in-situ radiometric measurements is the desire for testing concordance, i. We have demonstrated LARIMS by dating several samples using the Rb-Sr method and we have completed preliminary work that demonstrates the technique can be extended to Pb-Pb geochronology. The objective of this proposal is to perform measurements that enable us to assess LARIMS capabilities with other geochronology systems and to determine and overcome obstacles to developing in-situ measurements based on these systems in future missions.
This work, in combination with our successful Rb-Sr dating program, our recent lead-lead Pb-Pb dating study, and our preliminary samarium-neodymium Sm-Nd spectroscopy measurements, will complete a systematic study to assess the potential range of radiometric dating approaches for LARIMS analyses using a suite of geochronology dating systems, including Rb-Sr, Pb-Pb, Sm-Nd, rhenium-osmium Re-Os , and Lutetium-Hafnium Lu-Hf.
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The radioactive decay of Pt to Os has a half-life of (3)× years (which is longer than the age of the. Rhenium–osmium dating. Keep Exploring Britannica.
Copyright remains with the author s or their institution s. Permission for reuse free in most cases can be obtained from RightsLink. The Shimadong porphyry Mo deposit is located in eastern Yanbian, in the eastern part of the north margin of the North China craton, northeastern China. Here, we present the whole-rock major and trace elements, zircon U—Pb and Hf isotope data, and molybdenite Re—Os data for the Shimadong deposit.
The porphyry was emplaced at The porphyritic monzogranite had high SiO 2 These features are similar to those of adakitic rocks derived from a thickened lower crust. These data indicate that the primary magma of the Shimadong porphyritic monzogranite was mainly derived from partial melting of the thickened lower crust consisting of juvenile crust and pre-existing crust.