Pyrite is the most abundant sulfide mineral. Pyrite’s metallic luster and pale brass-yellow hue give it a superficial resemblance to gold , hence the well-known nickname of fool’s gold. The color has also led to the nicknames brass , brazzle , and Brazil , primarily used to refer to pyrite found in coal. By Georgius Agricola ‘s time, c. Pyrite is usually found associated with other sulfides or oxides in quartz veins , sedimentary rock , and metamorphic rock , as well as in coal beds and as a replacement mineral in fossils , but has also been identified in the sclerites of scaly-foot gastropods. A substantial proportion of the gold is “invisible gold” incorporated into the pyrite see Carlin-type gold deposit. It has been suggested that the presence of both gold and arsenic is a case of coupled substitution but as of the chemical state of the gold remained controversial. Pyrite has been used since classical times to manufacture copperas iron II sulfate. Iron pyrite was heaped up and allowed to weather an example of an early form of heap leaching. The acidic runoff from the heap was then boiled with iron to produce iron sulfate.
Top9. Re-Os isotopic analysis opened a new approach to dating sedimentary rocks
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Degao Zhai, Anthony E. Economic Geology ; 5 : — Native gold is intergrown with molybdenite and pyrite in auriferous quartz veins hosted by a monzogranite-monzonite stock and locally by Proterozoic gneiss, thereby offering an excellent opportunity to directly date the mineralizing event. Uranium-Pb age determinations for zircon yielded ages for the monzogranite and monzonite of Numerous mafic to felsic dikes, which are crosscut by ore veins pre-ore , parallel to these veins possibly synore , or crosscut by them post-ore , were carefully examined and dated.
The age of mineralization was determined directly using the Re-Os method applied to molybdenite. A total of 19 molybdenite samples separated from auriferous quartz veins yielded widely differing Re-Os model ages of to Ma, and replicate analyses of individual samples also yielded widely differing ages.
rhenium osmium using
Re and Os rhenium and osmium are chalcophile-siderophile elements transition metals with a unique position in isotope geochemistry. Unlike other commonly used decay schemes for radiometric dating, these metals take residency in resource-related media, for example, sulfide minerals, the organic component in black shales, coals, and bitumens and oils. In short, the reducing environment is their haven whereas under oxidizing conditions, Re and Os become unmoored and the radiometric clock becomes compromised.
The clock is not temperature sensitive, and its applicability spans Early Archean to Pleistocene.
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. Some key papers include:. Systematic work, aimed at further evaluating the utility, robustness and cross-calibration of the Re-Os geochronometer to other dating methods, has also been a key research theme.
Using Re-Os isotopes to determine the deposition age of petroleum source-rock formation organic-rich shales is a major research theme, both in terms of technical development and application. This method has been applied to better understand the origins of global Oceanic Anoxic Events OAEs , the timing of shale deposition and correlation in Precambrian sedimentary basins and this rise of oxygen on Earth.
Re-Os isotopes in natural hydrocarbons is the third major research theme of the laboratory, again approaching this new field from both a systematic evaluation and application perspective. Re-Os isotopes natural hydrocarbons are directly related to source-rock Re-Os isotope character and in some cases Re-Os geochronology of hydrocarbons is possible. Research Crustal Re-Os Geochronology Development of Re-Os geochronology for crustal matrices has been ongoing since in the laboratory.
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Researcher Qu W. Following molybdenite deposits, they innovatively produced standard substance for the Re-Os dating of Cu-Ni alkides and seafloor cobalt-rich crusts, which was certified as a national class 1 standard substance. After modifying the sample selection method, high-temperature sealed dissolution and testing analysis processes, they established the Re-Os isotopic analysis technique and dating method for pyrite, arsenopyrite, limestone, graphite, asphalt and other ultralow Re-Os content series samples.
Their total procedure blank and testing precision are already the international leading level. This offers a new technical approach to the isotopic dating of sedimentary rocks, hydrocarbon source rocks and oil-gas pools. Re-Os isotopic testing.
Re–Os geochronology, Noble gas isotopes, orogenic gold- arsenopyrite Küre, Rhenium–Osmium isotopic dating of two types of arsenopyrite from the.
Rhenium-osmium geochronology using arsenopyrite was undertaken for three gold deposits in the Meguma terrane, Nova Scotia, Canada, in order to better constrain their age of formation and to assess the utility of arsenopyrite for dating similar deposits globally. The lack of common Os in some arsenopyrite samples from both The Ovens and Dufferin permit calculation of single mineral model ages for each deposit, which are identical to those determined using the isochron method. Initial Os compositions for the two vein types at The Ovens suggest a predominately crustal source of Os in the mineralizing fluids, whereas a less radiogenic initial Os composition for arsenopyrite from Dufferin does not as clearly define a crustal metal source.
At a third locality, the Touquoy deposit, the Re-Os systematics of arsenopyrite associated with disseminated gold mineralization do not define a precise formation age, possibly as a result of mixing of Re and Os derived from the mineralizing fluid and the shale host rock. The Re-Os ages of arsenopyrite indicate that there were at least two distinct periods of gold deposition in the Meguma terrane coinciding with widespread tectonothermal events: regional deformation and metamorphism associated with Acadian orogenesis, and widespread generation of meta- and peraluminous granites and high-grade metamorphism within the basement rocks under the Meguma terrane.
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Geochronology of high-temperature rocks and hydrothermal ore deposits in China
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At a third locality, the Touquoy deposit, the Re-Os systematics of arsenopyrite and is slightly older than previous estimates based solely on 40Ar/39Ar dating.
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Reos dating arsenopyrite
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Request PDF | RE-OS DATING OF ARSENOPYRITE FROM THE GALENA MINE: EVIDENCE FOR MESOPROTEROZOIC AGE OF THE AG-PB-ZN.
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Geochronology of high-temperature rocks and hydrothermal ore deposits in China
The Maoling gold deposit, one of the large gold deposits in eastern Liaoning Province, NE China, is an arsenopyrite-disseminated gold deposit with a resource of approximately 25 t Au and an average Au grade of 3. Download to read the full article text. Zhou, T. Kong, F.
by Re–Os dating of a Neoproterozoic, postglacial black shale in Western Chem Geol –87 Martin CE () Re-Os isotopic investigation of the arsenopyrite in Meguma Group gold deposits, Meguma Terrane, Nova Scotia.
Full Text 2. Geochronological investigations in China were initiated nearly 50 years ago, mainly since the establishment of university programs teaching isotope geochemistry and the setup of geochronological laboratories. During the late ‘s and early s, the geochronological framework of China’s landmass has been established by numerous isotopic studies. Over the past decade, state-of-the-art geochronological laboratories have been established in China, contributing to the country’s increasing role in many fields of Geosciences.
This article highlights some of the major geochronological achievements of the past decades, with special focus on China’s Precambrian geology, the improved understanding of age relationships in the Mesozoic Igneous Province of eastern China, and new developments in the dating of hydrothermal ore deposits. Keywords: Geochronology, Precambrian continental evolution, Mesozoic Igneous Province, hydrothermal ore deposits, China.
This reos is affected by the charge re-os of rhenium atom. The beta decay arsenopyrite Re is used for rheniumosmium dating re-os ores. Facts Re-os Osmium.
Six arsenopyrites closely related to Au mineralization of the Maoling gold deposit are dated by Re-Os technique and define a Re-Os isochron with an age of.
Covid has significantly affected our fundraising. Please help! Learning Center What is a mineral? Mineral Name:. Locality Name:. Keyword s :. Sawayaerdun Pb-Zn deposit, Wuqia Co. Ulugqat Co. Click here to sponsor this page. Photos Maps Search. Estimate based on other nearby localities or region boundaries.
The Iso-Kuotko deposit is located 10 km to the north of Suurikuusikko along the same shear zone. Gold mineralization at Iso-Kuotko formed in two major stages: an early stage refractory gold mineralization with auriferous arsenopyrite with similarities to the ore at Suurikuusikko and a late, main stage mineralization with free gold in carbonate-quartz veins with abundant pyrrhotite, native bismuth and other sulphide minerals. This latter ore is absent at Suurikuusikko.
Based on U-Pb dating, as well as Re-Os and Pb-isotope systematics of rock-forming and hydrothermal minerals, we evaluate the relationships between tectonic evolution and formation of gold deposits throughout the late Palaeoproterozoic in the northern part of the CLGB.
These results show that arsenic-rich pyrite is called arsenious such as arsenopyrite are potentially very significant (Mumin et al., ), plications (e.g., U/Pb dating) and, with the recent advent of multi-collector ICP-MS.
Technician support will underpin growth of the Program through increased student involvement, increased Front Range collaborations, and expansion of global partnerships. New research opportunities will build on AIRIE’s nine-year history of collaborations with over scientists from industry, government and academia, on projects spanning five continents. To date, the focus of the Program has been on development, testing, and application of the rhenium-osmium Re-Os molybdenite geochronometer, with transfer of this technology to the mineral industry for application in exploration.
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