Dissecting the Re-Os molybdenite geochronometer

Yang Wang 1 and Nianqiao Fang 1. Create citation alert. Buy this article in print. Journal RSS feed. Sign up for new issue notifications. During the partial melting of the mantle, due to the compatibility difference, Re tends to enter the melt and concentrate in the earth crust, while Os tends to remain in the residual phase, thereby enriching in the mantle. The change is recorded in the growing of the hydrogenetic marine authigenic mineral such as polymetallic crusts, and by comparing the layered Os isotope composition curve of crusts with the seawater standard curve, the dating can be realized. In this study, by comparing the Os isotopic composition curves of six polymetallic crust samples from the central and western Pacific, four new curve characteristics were recognized, providing reference for the accurate chronology work. Meanwhile, the regional and periodic difference of the curve are studied.

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10 Tritium dating 11 Background Tritium dating Other methods dating approach K–Ca chronology of lunar granites Re—Os dating​.

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Re-Os dating method was applied to the Kuroko ores from of the Wanibuchi Mine​, southwestern Japan. Two whole-rock Kuroko ores and two yellow color.

Rhenium—osmium dating is a form of radiometric dating based on the beta decay of the isotope Re to Os. This normally occurs with a half-life of Rhenium—osmium dating is carried out by the isochron dating method. Isochrons are created by analysing several samples believed to have formed at the same time from a common source. The Re-Os isochron plots the ratio of radiogenic Os to non-radiogenic Os against the ratio of the parent isotope Re to the non-radiogenic isotope Os.

The stable and relatively abundant osmium isotope Os is used to normalize the radiogenic isotope in the isochron. A good example of an application of the Re-Os isochron method is a study on the dating of a gold deposit in the Witwatersrand mining camp, South Africa. Rhenium and osmium were strongly refractory and siderophile during the initial accretion of the Earth which caused both elements to preferentially enter the Earth’s core.

Re tends to enter the melt phase incompatible while Os remains in the solid residue compatible. In this regard, the Re—Os system to study the geochemical evolution of mantle rocks and in defining the chronology of mantle differentiation is extremely helpful. Peridotite xenoliths which are thought to sample the upper mantle sometimes contain supra-chondritic Os-isotopic ratios.

This combination of radiogenic Os that was created by decay of Re and nonradiogenic melts helps to support the theory of at least two Os-isotopic reservoirs in the mantle. The second reservoir is chondritic in composition.

First in situ Re-Os dating of molybdenite by LA-ICP-MS/MS

Dating of lead-zinc deposits is of critical importance for better understanding of ore genesis, but has long been a big challenge due to the lack of suitable minerals that can be unequivocally linked to the ore genesis and that can be used for tradition radiometric methods. This kind of deposits have simple mineralogy dominated by galena and sphalerite commonly associated with calcite and other gangue minerals. 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. In this study, we investigate the recovery of Re using different media for anion exchange separation and reporte a revised preparation method for Re-Os dating of galena and sphalerite.

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Democracy, literally, rule by the people. If you prefer to suggest your own revision of the article, you can go to edit mode requires login. Thank you for your feedback. The information presented below briefly outlines how Chemostrat is utilising two of these techniques, i.

Highly precise Re-Os dating for molybdenite using alkaline fusion and NTIMS.

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. Moreover, when these minerals are found in fractures it can be used to provide a minimum date for when the fracture network was open.

Rhenium-osmium (Re-Os) dating of two molybdenite samples from the alkali granite and pegmatite of Ambalavayal in northern Kerala (S. India) yielded ages of.

Official websites use. Share sensitive information only on official, secure websites. By: A. Two Re-Os dating reference material molybdenites were prepared. The samples proved to be homogeneous, based on the coefficient of variation of analytical results and an analysis of variance test. The sampling weight was 0. An isotope dilution method was used for the determination of Re and Os. Sample decomposition and preconcentration of Re and Os prior to measurement were accomplished using a variety of methods: acid digestion, alkali fusion, ion exchange and solvent extraction.

Negative thermal ionisation mass spectrometry and inductively coupled plasma-mass spectrometry were used for the determination of Re and Os concentration and isotope ratios. The certified values include the contents of Re and Os and the model ages. For HLP, the Re content was For JDC, the Re content was

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Journal Name: pp of Radioactive Dating and Methods of Low-Level RHENIUM ; OSMIUM ISOTOPES Os/content in sulfidic ore deposits, use​.

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.

Rhenium—osmium dating. Info Print Cite. Submit Feedback. Thank you for your feedback. The Editors of Encyclopaedia Britannica Encyclopaedia Britannica’s editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree See Article History. Read More on This Topic.

The decay scheme in which rhenium is transformed to osmium shows promise as a means of studying mantle—crust evolution and the evolution Learn More in these related Britannica articles:. The decay scheme in which rhenium is transformed to osmium shows promise as a means of studying mantle—crust evolution and the evolution of ore deposits. Osmium is strongly concentrated in the mantle and extremely depleted in the crust, so that crustal osmium must….

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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.

Keywords: Re–Os isotopic dating; Ar–Ar dating; Porphyry/skarn/stratabound Cu–​Au–Mo deposits; Magnetite porphyry deposits; Middle–Lower. Yangtze River.

The Yamansu iron deposit, hosted in submarine volcanic rocks, is located in the Aqishan-Yamansu Fe-Cu metallogenic belt of eastern Tianshan, Xinjiang. New pyrite Re-Os, and pyroxene diorite intrusion ages and the chemistry of magnetite constrain the origin of the deposit. The Yamansu orebodies display banded or lenticular forms and sharp contacts with marble and garnet skarn. Pyrite associated with magnetite from hydrothermal massive ores has a Re-Os isochron age of However, the pyroxene diorite age Magnetite samples from different ores in the Yamansu deposit are suggested to have a magmatic-hydrothermal origin.

Moreover, magmatic and hydrothermal magnetite samples show different characteristic normalized rare earth element REE and trace element patterns. A combination of ore fabrics, discrimination diagrams, and normalized patterns for magnetite samples can reflect the magmatic-hydrothermal process.

Canadian Journal of Earth Sciences

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Highly Precise Re-Os Dating for Molybdenite Using Alkaline Fusion and NTIMS. Talanta. Mar;45(5) doi: /s(97)

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Highly precise Re-Os dating for molybdenite using alkaline fusion and NTIMS

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Creaser, Jamie J. Wilkinson, Sarah A. Gleeson; Re-Os dating of pyrite confirms an early diagenetic onset and extended duration of mineralization in the Irish Zn-​Pb.

Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. Miller Published Geology. The principal aim of this study is the evaluation of algal laminites as appropriate substrates for the application of the Re-Os chronometer. Devonian Keg River algal laminites produced an isochron date Ordovician kukersites from the Yeoman Fm.

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