Fundamental study on rhenium – osmium dating for mudstones

Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. A Nature Research Journal. Understanding the distribution of parent Re and radiogenic daughter Os isotopes in molybdenite is critical in interpreting isotopic measurements because it can compromise the accurate determination and interpretation of mineralization ages. In order to resolve the controls on the distribution of these elements, chemical and isotope mapping of MoS 2 grains from representative porphyry copper-molybdenum deposits were performed using electron microprobe and nano-scale secondary ion mass spectrometry. Our results show a heterogeneous distribution of , Re and Os isotopes in MoS 2 , and that both Re and Os isotopes are not decoupled as previously thought. We conclude that Re and Os are structurally bound or present as nanoparticles in or next to molybdenite grains, recording a complex formation history and hindering the use of microbeam techniques for Re-Os molybdenite dating. Our study opens new avenues to explore the effects of isotope nuggeting in geochronometers.

Rhenium-osmium dating method

ABSTRACT Stein EAR This project addresses one of the fundamental underpinnings needed to understand geologic processes that produce copper-molybdenum deposits associated with magmatism at shallow levels in the earth’s crust. This underpinning is the timing and duration of the mineralization process within the broader context of the magmatism and the tectonic and geologic evolution of a terrane.

It has been said: “No Dates, No Rates! Do they form over tens of millions of years or more , or do they form in a few hundred thousand years or less? For example, one dating technique involves the use of Ar argon , a gas in its natural state, and although Ar may be found and measured in rocks and minerals, this is not a comfortable site for the element.

In contrast, both Re and Os are sulfide-loving, and are naturally concentrated in metallic ore minerals.

Rhenium-osmium isotope systematics in meteorites I: Magmatic iron meteorite groups IIAB Niemeyer SAr 39Ar dating of inclusions from IAB iron meteorites.

Grant-in-Aid for Scientific Research C. An early stage of the present project, developmental efforts for Re-Os analyses were made. The Re mass spectrometry was usually disturbed by filament blank, but finally successful measurements were attained. However, the contribution of filament Re is still large, and our efforts must be given to reduce such effect. The Re-Os dating method were applied to several kinds of samples such as Permian Akasaka limestones, late Jurassic mudstones from Tamba group, Miocene mudstones from Shimane Prefecture, present-day river and marine sediments.

Those data indicate two important aspects: 1 Most of the limestones and mudstones undergone severe thermal event during diagenetic processes are not suitable for Re-Os dating. Re might tend to be mobilized during such processes. Finally, although application of Re-Os method to sedimentary rocks might be restricted to relatively young rocks, this method must deserve attention for further geological investigations.

All Other.

Dissecting the Re-Os molybdenite geochronometer

A newly acquired mass spectrometer MI by the Mass Spectrometry Laboratory will be adapted to determine rhenium and osmium isotope concentrations using negative thermal ionization mass spectrometry NTIMS. We describe the principle of the Re-Os dating technique and the thermal ionization phenomena which lead to high precision isotope analysis on NTIMS. Bahcall JN,

Re–Os geochronology underpins dating of materials from meteorites, the Rhenium–osmium geochronology is based on radioactive decay of.

Re and Os are redox-sensitive and organophilic, and can be enriched in potential hydrocarbon source rocks, tar sands, crude oil, and bitumen. Re-Os geochronology of these organic-rich samples has the potential for direct dating the time frame of hydrocarbon formation, migration or charge within a petroleum system. Here, we review some major reported case studies on the Re-Os geochronology of oil and gas reservoirs over the last decade.

Filling the above knowledge gaps requires a comprehensive academia-industry collaboration, which is critical step to accomplish a valuable application guide for the petroleum industry end-users on using the Re-Os isotope system to directly date petroleum systems. JavaScript is disabled for your browser. Some features of this site may not work without it. Rhenium-osmium geochronology in dating petroleum systems:progress and challenges.

Access Status Fulltext not available. Type Journal Article. Metadata Show full item record. Citation Li, Z. DOI ISSN School Department of Construction Management.

Research (Crustal Re-Os Geochronology)

Development of Re-Os geochronology for crustal matrices has been ongoing since in the laboratory. This work has resulted in major advancements in the direct isotopic dating of crustal sulfide minerals, petroleum source-rocks, and natural hydrocarbons, using Re-Os isotopes. For sulfide minerals, Re-Os geochronology has direct application to the timing and duration of hydrothermal ore deposit formation.

Rhenium and osmium are organophilic and arguably redox‐sensitive, Previous application of the Re–Os system to the dating of.

America; West of Shetlands oilfields. Selby’s research has developed a unique geochemical toolbox using rhenium, osmium, platinum and palladium that constrain more accurate geological models leading to better reserve predictions. The toolbox provides previously unavailable geological time constraints and source identification of resources e. The underpinning research carried out by Selby TOTAL Reader in Petroleum Geoscience, appointed and his research group at Durham University from appointment to present addresses longstanding academic industry-related issues concerning the development of subsurface Earth resources.

Specifically, exactly when, how and where do resources, such as oil and copper, form in rocks? Analytical and technological advances, developed in part by research at Durham, have permitted the use of previously challenging geochemical methods to help answer old, but critically important geological questions. Selby, his research group and international collaborations 6 PhD students, 2 post-doctoral researchers, United States and Canada Geological Survey research staff; Prof.

As a direct result, Selby’s research has defined and enhanced the precision and understanding of Re-Os and Pd-Pt analytical protocols and elemental behaviour in rocks and minerals. This has improved our understanding of genetic models for both mineral and hydrocarbon systems []. In impact terms, the outcome yields critical necessary data required for exploration programmes [Section 4].

Ultimately Selby’s research has shown that the Re-Os system can be applied much more widely than previously thought and has placed Durham at the forefront in the use of this novel research tool both academically and through industry. This leadership was recognised by the award of the William Smith Fund to Selby from the Geological Society of London for excellence in contributions to applied and economic aspects of the science and by the TOTAL petroleum company who fund Selby’s position at Durham.

Direct radiometric dating of hydrocarbon deposits using Rhenium-Osmium isotopes.

Rhenium–osmium dating

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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.

This report presents the results of rhenium-osmium Re-Os isotope analysis performed on 11 organic-rich and radiogenic shale samples from the following Devonian and Jurassic formations in central and northern Alberta:. Current detailed stratigraphic work at the AGS includes an effort to resolve uncertainties regarding the age and stratigraphic position of a number of stratigraphic units, based on precise isotope dating.

Recent advances in dating organic-rich shales using the Re-Os isotope system have allowed us to date important hydrocarbon source rocks in the Western Canada Sedimentary Basin. A, Toma, J. Alberta Geological Survey. Author s Pana, D. Creaser, R. Toma, J. Playter, T. Corlett, H. Hauck, T.

osmium isotopes rhenium

Official websites use. Share sensitive information only on official, secure websites. Re—Os geochronology of the lacustrine Green River Formation: Insights into direct depositional dating of lacustrine successions, Re—Os systematics and paleocontinental weathering Earth and Planetary Science Letters. By: Vivien M. Lacustrine sedimentary successions provide exceptionally high-resolution records of continental geological processes, responding to tectonic, climatic and magmatic influences.

These successions are therefore essential for correlating geological and climatic phenomena across continents and furthermore the globe.

Rhenium–osmium dating. Rhenium and Osmium were strongly refractory and siderophile during the initial accretion of the Earth which caused.

A method of radiometric dating based on the decay of rhenium Re to osmium Os , with a half-life of 4. Access to the complete content on Oxford Reference requires a subscription or purchase. Public users are able to search the site and view the abstracts and keywords for each book and chapter without a subscription. Please subscribe or login to access full text content. If you have purchased a print title that contains an access token, please see the token for information about how to register your code.

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Chemostrat Rhenium Osmium