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Re os dating pyrite

Gold mineralization is hosted by porphyritic syenogranite and controlled by NW-trending faults.Our study provides the first precise age for the Tugurige gold mineralization and host porphyritic syenogranite.263Economic Geology II: Metamorphic, Granite Sn-Ta Associated, Coeur D'Alene Ag, Carlin Au, Epithermal, MVT, U, and Industrial Minerals Oregon Convention Center: D137/13 PM- PM, Wednesday, 21 October 2009Geological Society of America Abstracts with Programs, Vol. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes.Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information.The deposit consists of disseminated, banded and massive ores.Metallic minerals are dominantly magnetite and pyrite, with minor titanite, pyrrhotite, chalcopyrite, and sphalerite.

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The northern margin of the North China Block was a passive continental margin, but not a subduction zone with enormous volcanic activities in the Early Paleozoic Era.Pyrite studied is associated with barite and separated from a vein cutting REE mineralization.Pyrites analyzed contain 16–30 ng Re and 0.10–0.16 ng Os, and yield a Caledonian isochron age of 439 ±86 Ma.From the Bog Zone at Lisheen we have located main ore stage pyrite with Re contents suitable for Re-Os geochronology.This pyrite shows very high Re/Os ratios, from 3000 - 6000, with low common Os contents - the majority of Os present is radiogenic 187Os (94%)., (1) Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2R3, Canada, [email protected], (2) Department of Earth Science and Engineering, Imperial College London, South Kensington Campus, Exhibition Road, London, SW7 2AZ, United Kingdom The Lisheen deposit is a significant resource within the Irish Midlands Pb-Zn province, and is a typical example of carbonate-hosted base metal mineralization in the region.Like the majority of the Irish Pb-Zn deposits, Lisheen is hosted by Lower Carboniferous strata, but the timing of sulfide mineralization is only poorly constrained by geochronologic methods due to the absence of minerals useful for dating by commonly-applied methods such as K-Ar, U-Pb and Rb-Sr.Gangue minerals include dolomite with minor forsterite, diopside, apatite, biotite, chlorite, tourmaline, tremolite, talc, calcite, and magnesite.Pyrite separates from ores have 10.7 to 54.7 ppb Re and 0.033 to 0.175 ppb common Os.Those from the massive ores have a model 1 isochron age of 535 ± 36 Ma (2σ), in agreement with the isochron age (528 ± 18 Ma) of pyrite from the banded ores by regression of seven Re–Os analyses.The Re–Os age of ~ 530 Ma reflects the timing of a hydrothermal event that remobilized the Tianhu deposit.

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  1. Re-Os Dating Arsenopyrite Read ReOs isochron ages for arsenopyrite from. Re Os dating on pyrite and metal sources tracing in porphyrytype and neutral.

  2. Six pyrite samples from the giant Bayan Obo REE-Nb-Fe deposit are dated by Re-Os technique. Pyrite studied is associated with barite and separated from a vein cutting REE mineralization.

  3. Pyrite Re–Os and zircon U–Pb dating of the Tugurige gold deposit in the western part of the Xing'an–Mongolia Orogenic Belt, China and its geological significance

  4. Abstract. The Irish Midlands region contains one of the world's largest hydrothermal Zn-Pb ore districts, but uncertainty exists in the timing of mineralization.

  5. First Reliable Re–Os Ages of Pyrite and Stable Isotope Compositions of Fe. Resource Geology, 63 166–187. doi 10.1111/rge.12003. Pyrite; Re–Os dating.

  6. Re-Os dating of pyrite confirms an early diagenetic onset and extended duration of mineralization in the Irish Zn-Pb ore field

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