Eaglet property, southeastern British Columbia: Re-Os geochronology, sulphur isotopes, and thermobarometry

0488680 - GLÚ 2019 RIV CA eng J - Journal Article
Hora, Z. D. - Stein, H. - Žák, Karel - Dobeš, P.
Eaglet property, southeastern British Columbia: Re-Os geochronology, sulphur isotopes, and thermobarometry.
Geological Fieldwork. Roč. 2017, č. 1 (2018), s. 157-166. ISSN 0381-243X
Institutional support: RVO:67985831
Keywords : Eaglet deposit * MINFILE 093A 046 * fluorite * celestite * molybdenite * sulphur isotopes * Re-Os geochronology * fluid inclusion microthermobarometry
OECD category: Geology
http://cmscontent.nrs.gov.bc.ca/geoscience/PublicationCatalogue/Paper/BCGS_P2018-01-08_Hora.pdf

New Re-Os age data from three molybdenite samples collected at the Eaglet property in southeastern British Columbia yielded model ages of 200.3, 233.8 and 251.6 Ma, but the signifi cance of these multiple ages remains unclear. Sulphur values of δ³⁴S +6.00 to +12.91‰ for celestite are outside the range of published values for sulphates of marine origin and indicate some other crustal source of sulphate. Galena intergrown with celestite shows an overlapping δ³⁴S of +12.07‰, but pyrite displays much lower δ³⁴S values: +0.99 to -4.84‰. With δ³⁴S restricted to -3.93 to -5.04‰, molybdenite suggests a single homogeneous sulphur source, in spite of the three signifi cantly different model ages. Fluid inclusions in fluorite samples display varied fluid types corresponding to three types of fluorite identified macroscopically. This is consistent with the idea of multiphase mineralization described for this deposit in previous reports. The minimum trapping pressure, constrained by temperature and composition, is 2.1 to 2.6 Kb.
Permanent Link: http://hdl.handle.net/11104/0283232