Rhenium-osmium dating , method of determining the age of the important ore mineral molybdenite; the method is based upon the radioactive decay of rhenium to osmium The rhenium-osmium ratio in most minerals is too low to be of general use as a dating technique, but molybdenite molybdenum disulfide, MoS 2 has a very high ratio of rhenium to osmium; and workers have found that the osmium in molybdenite is practically pure radiogenic osmium Ores as old as 3, years and as young as 38, years have been dated this way. Rhenium-osmium dating. Info Print Cite. Submit Feedback.
Polished thin sections of the 15 samples were studied by means of transmitted and reflected light microscopy in order to establish, prior to mineral separation, the paragenetic relationships between sulphides and gangue minerals, as well as the relative timing between carrolite and bornite. In addition, an aliquot of each sulphide mineral separate was embedded in epoxy. To further this quality control of mono-mineralic sulphide separates, these qualitative observations were complemented by point wavelength-dispersive spectroscopy WDS analyses of carrolite and bornite in the mounts using the following suite of elements: S, Fe, Co, Ni, Cu, Cd, and Te.
Age and tectonic setting of the Udokan sediment-hosted copper-silver deposit, Transbaikalia, Russia.
Ore Geol. Selley, D. A new look at the geology of the Zambian Copperbelt. Kucha, H. Geology, mineralogy and geochemistry of the Kupferschiefer, Poland [Kelly, J. Sillitoe, R. Age of the Zambian Copperbelt. An example of synorogenic sediment-hosted copper mineralization: geologic and geochronologic evidence from the Paleoproterozoic Nussir Deposit, Finnmark, Arctic Norway.
Box, S. Sulfide-bearing veinlets throughout the stratiform mineralization of the Central African Copperbelt: temporal and genetic implications. Two ages of copper mineralization in the Mwombezhi dome, northwestern Zambia: Metallogenic implications for the Central African Copperbelt. McGowan, R. Origin of the copper-cobalt deposits of the Zambian Copperbelt: an epigenetic view from Nchanga. Geology 31- Sutton, S. A fluid mixing model for copper mineralization at Konkola North, Zambian Copperbelt.
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Oct 08, Cumming, V. M., Selby, D. & Lillis, P. G. Re-Os geochronology of the lacustrine Green River Formation: Insights into direct depositional dating of lacustrine successions, Re-Os systematics and Cited by: 3. Rhenium-osmium dating, method of determining the age of the important ore mineral molybdenite; the method is based upon the radioactive decay of rhenium to osmium The rhenium-osmium ratio in most minerals is too low to be of general use as a dating technique, but molybdenite (molybdenum disulfide, MoS 2) has a very high ratio of rhenium to osmium; and . However, direct radiometric dating of Pb-Zn mineralization is often impeded because of the absence of suitable minerals for dating although Re-Os dating .
Selective fault reactivation during basin inversion: potential for fluid redistribution through fault-valve action. Basin Inversion 883- Zhang, Y. Fluid flow during deformation associated with structural closure of the Isa superbasin at Ma in the central and northern Lawn Hill platform, northern Australia. Hitzman, M. Muchez, P. Discussion: Age of the Zambian Copperbelt. El Desouky, H. Genesis of sediment-hosted stratiform copper-cobalt mineralization at Luiwishi and Kamoto, Katanga Copperbelt Democratic Republic of Congo.
Formation of sedimentary rock-hosted stratiform copper deposits through Earth history. Chapter 16, - Society of Economic Geologists, Master S.
Jun 13, Both galena and sphalerite have low and high variable Re concentrations and thus Re-Os dating of these minerals have been less promising. In addition, the recovery of Re is extremely low for galena when conventional method was applied, lending additional difficulty in precisely dating saporiviafrancigena.com by: Importantly, Re-Os isotope dating demonstrates that some single diamonds have protracted timescales of growth with different ages associated with core and rim zones. Zoned single eclogitic crystals from Mir and 23 rd Party Congress in the current study crystallised over intervals that were irresolvable (Cited by: Nov 22, 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 Cited by: 4.
Neoproterozoic glaciogenic diamictites on the Katanga Supergroup, Central Africa. Memoirs 36- Geological Society, London, Cailteux, J. Jackson, M. Neoproterozoic allochthonous salt tectonics during the Lufilian orogeny in the Katangan Copperbelt, centralAfrica.
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Rooney, A. A Cryogenian chronology: Two long-lasting synchronous Neoproterozoic glaciations. Hoffman, P. A Neoproterozoic snowball Earth. Hoffmann, K.
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Robb, L. Contributions to the geology and mineralization of the central African Copperbelt. McIntosh, J. Impacts of Pleistocene glaciation on large-scale groundwater flow and salinity in the Michigan Basin.
Glacial impacts on hydrologic processes in sedimentary basins: evidence from natural tracer studies.
Rainaud, C. Koziy, L. Salt as fluid driver, and basement as a metal source, for stratiform sediment-hosted copper deposits. Lee, C. Milton, J. In situ monazite dating of sediment-hosted stratiform copper mineralization in the Redstone Copper belt, Northwest Territories, Canada: Cupriferous fluid flow late in the evolution of a Neoproterozoic sedimentary basin. The sediment-hosted stratiform copper ore system.
Liu, W. John, T. Evidence for a Neoproterozoic ocean in south-central Africa from mid-oceanic-ridge-type geochemical signatures and pressure-temperature estimates of Zambian eclogites. Torrealday, H. Re-Os and U-Pb dating of the vein-hosted mineralization at the Kanshansi copper deposit, northern Zambia.
Eglinger, A. Geochemical signatures of uranium oxides in the Lufilian belt: from unconformity-related to synmetamorphic uranium deposits during the Pan-African orogenic cycle. Cosi, M. Late Proterozoic thrust tectonics, high-pressure metamorphism and uranium mineralization in the Domes area, Lufilian arc, northwestern Zambia.
Milani, L. A-type magmatism in a syn-collisional setting: the case of the Pan-African Hook batholith in Central Zambia.
Nisbet, B. Exploration for iron oxide copper gold deposits in Zambia and Sweden: comparison with the Australian experience. Slack, J.
Saintilan, N. Lyubetskaya, T. Modelling metamorphism in collisional orogens intruded by magmas: II. Fluid flow and implications for Barrovian and Buchan metamorphism, Scotland. Origin of the Nchanga copper-cobalt deposits of the Zambian Copperbelt.
Jan 07, The Twitya Formation Re-Os date is identical, within uncertainty, to existing postglacial U-Pb zircon geochronological data from Australia and South China (Fig. 4, Fig. S2, and Table S6) (35, 36), although there are some discrepancies related to analytical procedures of some of the Re-Os ages from Australia (5, 6).Cited by: Re-os dating - If you are a middle-aged man looking to have a good time dating woman half your age, this advertisement is for you. Join the leader in relations services and find a date today. Re - Os dating and oil - source rock correlation is actually helped if the oils are highly biodegraded, e.g., oil sands, tar mats and bitumen-stained sandstones (where traditional techniques such as biomarker identification are disrupted), as this concentrates Re and Os within an oil making analysis easier.
Cumming, V. Re-Os geochronology of the lacustrine Green River Formation: Insights into direct depositional dating of lacustrine successions, Re-Os systematics and paleocontinental weathering. Selby, D. Re-Os sulfide bornite, chalcopyrite, and pyrite systematics of the carbonate-hosted copper deposits at Ruby Creek, Southern Brooks Range, Alaska.
Creaser, R. Negative thermal ion mass spectrometry of osmium, rhenium and iridium. Osmium isotopic ratio determination by negative thermal ionization mass spectrometry. Ionic Phys. Ludwig, K Isoplot, version 4. Berkeley Geochronology Centre Special Publication 4 Armstrong, R.
Geochronology of the Nchanga granite, and constraints on the maximum age of the Katanga Supergroup, Zambian Copperbelt. Download references. Saintilan N. The authors are indebted to the Royal Museum for Central Africa, Belgium for the supply of the precious samples from the Kamoto deposit.
Antonia Hofmann and Dr.
Geoff Nowell are thanked for technical support. John M. Correspondence to N. Publisher's note: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations. Reprints and Permissions.
Sci Rep 8, Download citation. Received : 16 February Accepted : 11 September Published : 08 October Ore Geology Reviews Geological Society, London, Special Publications Economic Geology Mineralium Deposita By submitting a comment you agree to abide by our Terms and Community Guidelines.
If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate. This normally occurs with a half-life of Rhenium-osmium dating is carried out by the isochron dating method. Isochrons are created by analysing several samples believed to have formed at the same time from a common source.
The Re-Os isochron plots the ratio of radiogenic Os to non-radiogenic Os against the ratio of the parent isotope Re to the non-radiogenic isotope Os. The stable and relatively abundant osmium isotope Os is used to normalize the radiogenic isotope in the isochron.
A good example of an application of the Re-Os isochron method is a study on the dating of a gold deposit in the Witwatersrand mining camp, South Africa.
Rhenium and osmium were strongly refractory and siderophile during the initial accretion of the Earth which caused both elements to preferentially enter the Earth's core. Re tends to enter the melt phase incompatible while Os remains in the solid residue compatible. In this regard, the Re-Os system to study the geochemical evolution of mantle rocks and in defining the chronology of mantle differentiation is extremely helpful.
Peridotite xenoliths which are thought to sample the upper mantle sometimes contain supra-chondritic Os-isotopic ratios. This combination of radiogenic Os that was created by decay of Re and nonradiogenic melts helps to support the theory of at least two Os-isotopic reservoirs in the mantle.
The second reservoir is chondritic in composition. Direct measurement of the age of continental crust through Re-Os dating is difficult.
Instead, determining model ages can be done in two ways: "Re depletion" model ages or the "melting age" model. The radioactive decay of Pt to Os has a half-life of 6. Since both parental isotopes have extremely long half-lives, the Os-isotope rich reservoir must be very old to allow enough time for the daughter isotopes to form.