Re os dating pyrite

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Consequently, genetic models for ore formation are poorly constrained and remain controversial. The Irish Midlands region contains one of the world’s largest hydrothermal Zn-Pb ore districts, but uncertainty exists in the timing of mineralization relative to host rock ages.Selby has been involved in the development and application of the Re-Os isotope system since 1999.His research focuses on the systematic development and application of the Re-Os isotope system to economic geology (e.g., sulfide Re-Os geochronology), chronology of sedimentary and petroleum systems, paleoclimate, paleoceanography, For excellence in contributions to applied and economic aspects of the science Selby has been awarded the William Smith Fund (2009) from The Geological Society of London.Detailed information on how Wiley uses cookies can be found in our Privacy Policy.We use cookies to make interactions with our website easy and meaningful, to better understand the use of our services, and to tailor advertising.The widely proposed syngenetic and syndiagenetic models require that mineralization coincided with or occurred fairly soon after the ca.346 Ma stratigraphic age of the host sequence at Lisheen and elsewhere, but none of the available age constraints for sulfide mineralization match this age, a problem complicated by younger Variscan events.

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Recent paleomagnetic data from Lisheen have been interpreted to indicate post-Variscan epigenetic mineralization at ca.

277 Ma, much younger than previously proposed and in apparent contradiction with Variscan thrust deformation of the ores.

The Re-Os ages overlap with the ages of lower Carboniferous volcanic rocks in the Midlands, which are the product of magmatism that has been invoked as the driving force for hydrothermal activity.

The relatively low initial Os ratios for both Lisheen (0.253 ± 0.045) and Silvermines (0.453 ± 0.006) are compatible with derivation of Os from these magmas, or from the Caledonian basement that underlies the ore deposits.

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