Laoyaling is a typical stratiform deposit in the Tongling district and the molybdenum orebody is hosted by black shale of the Dalong Formation of the Upper Permian system. The apparent Re-Os age is a few million years younger than the depositional age of the Late Permian. The young isochron age may be caused by the later hydrothermal disturbance or mass fractionation during ICP-MS measurement. However, the obtained isochron age is close to the depositional age and far earlier than those of the Late Yanshanian intrusions. It suggests that the Mo ore of the Laoyaling deposit is sedimentary in origin and not related to the Late Yanshanian magmatism. Black shales of the Upper Permian are distributed widely in the Mid-Lower Yangtze region, our result is important for understanding the ore-forming processes in the region and broadens the exploration target. This is a preview of subscription content, log in to check access. Chang, Y. Google Scholar. Huang, X.
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Rhenium—osmium dating is a form of radiometric dating based on the beta decay of the isotope Re to Os. 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.
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Copyright remains with the author s or their institution s. Permission for reuse free in most cases can be obtained from RightsLink. The Shimadong porphyry Mo deposit is located in eastern Yanbian, in the eastern part of the north margin of the North China craton, northeastern China. Here, we present the whole-rock major and trace elements, zircon U—Pb and Hf isotope data, and molybdenite Re—Os data for the Shimadong deposit. The porphyry was emplaced at The porphyritic monzogranite had high SiO 2 These features are similar to those of adakitic rocks derived from a thickened lower crust.
These data indicate that the primary magma of the Shimadong porphyritic monzogranite was mainly derived from partial melting of the thickened lower crust consisting of juvenile crust and pre-existing crust.
Highly precise Re-Os dating for molybdenite using alkaline fusion and NTIMS
Official websites use. Share sensitive information only on official, secure websites. By: A. Two Re-Os dating reference material molybdenites were prepared. The samples proved to be homogeneous, based on the coefficient of variation of analytical results and an analysis of variance test. The sampling weight was 0.
Abstract: Recently, Creaser et al., and Volkening and Heumann, have demonstrated the efficient production of large (approximately 10 exp A) ion beams by.
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Re–Os dating of molybdenite from small deposits is used to define crustal domains exhibiting ductile versus brittle behaviour during gravitational collapse of the.
Yang Wang 1 and Nianqiao Fang 1. Create citation alert. Buy this article in print. Journal RSS feed. Sign up for new issue notifications. During the partial melting of the mantle, due to the compatibility difference, Re tends to enter the melt and concentrate in the earth crust, while Os tends to remain in the residual phase, thereby enriching in the mantle. The change is recorded in the growing of the hydrogenetic marine authigenic mineral such as polymetallic crusts, and by comparing the layered Os isotope composition curve of crusts with the seawater standard curve, the dating can be realized.
In this study, by comparing the Os isotopic composition curves of six polymetallic crust samples from the central and western Pacific, four new curve characteristics were recognized, providing reference for the accurate chronology work. Meanwhile, the regional and periodic difference of the curve are studied. It can be preliminarily explained as the regional earth-mantle derived materials supply events but it didn’t break the overall pattern of the Pacific system. Content from this work may be used under the terms of the Creative Commons Attribution 3.
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Official websites use. Share sensitive information only on official, secure websites. Coal deposits are integral to understanding the structural evolution and thermal history of sedimentary basins and correlating contemporeous estuarine and fluvial delatic strata with marine sections.
Goals This proposed work will extend laser ablation resonance ionization spectrometry LARIMS from the previously demonstrated rubidium-strontium Rb-Sr geochronology system to four other radiogenic systems, enabling in-situ, concordant age determinations to be made on extraterrestrial bodies in the solar system. Advantages include providing an independent test of concordance, while expanding the potential range of samples that can be successfully measured. Testing for concordance is important because individual isotopic dating systems can be biased by a variety of factors.
These biases are frequently distinct for different radiometric systems. Objectives This proposal addresses the important NASA goal to understand the history and evolution of the solar system. The time of key events in solar system history are poorly constrained by current samples, giving impetus to future missions with sample return and in-situ landed dating measurements. An issue for in-situ radiometric measurements is the desire for testing concordance, i.
We have demonstrated LARIMS by dating several samples using the Rb-Sr method and we have completed preliminary work that demonstrates the technique can be extended to Pb-Pb geochronology. The objective of this proposal is to perform measurements that enable us to assess LARIMS capabilities with other geochronology systems and to determine and overcome obstacles to developing in-situ measurements based on these systems in future missions. This work, in combination with our successful Rb-Sr dating program, our recent lead-lead Pb-Pb dating study, and our preliminary samarium-neodymium Sm-Nd spectroscopy measurements, will complete a systematic study to assess the potential range of radiometric dating approaches for LARIMS analyses using a suite of geochronology dating systems, including Rb-Sr, Pb-Pb, Sm-Nd, rhenium-osmium Re-Os , and Lutetium-Hafnium Lu-Hf.
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While whole-rock peridotite Re-Os isotopic signatures are the core of such investigations, the Re-Os dating of individual peridotite minerals—base metal sulfides BMS and platinum group minerals PGM —that are the main hosts for Re and Os in the mantle peridotites came into play two decades ago. This is, however, not a rule of thumb as clear evidence of crust-mantle age decoupling also exist. As such, they are the mantle equivalents of crustal zircons.
Furthermore, we performed Re–Os dating on samples from massive sulfide ores and attempted to trace the source of the ore-forming magma.
Over the years, Chemostrat has expanded the services on offer to now include more advanced isotopic techniques that so far have been used only in academia. The information presented below briefly outlines how Chemostrat is utilising two of these techniques, i. Re and Os become concentrated in the organic, hydrogenous fraction of organic rich shales, thus the time when the shale was deposited can be dated.
Furthermore, as Re and Os have been inherited from the source rocks, Os isotopes can be employed to correlate an oil with its source. Despite this application mainly being associated with the economic extraction of minerals, it can be employed by the oil and gas industry to date the formation of disseminated sulphide minerals within basement rocks and so the basement itself. Moreover, when these minerals are found in fractures it can be used to provide a minimum date for when the fracture network was open.
Re-Os Radiogenic Isotope Dating Methods and Applications Over the years, Chemostrat has expanded the services on offer to now include more advanced isotopic techniques that so far have been used only in academia. Establishing when organic shales were deposited Re and Os become concentrated in the organic, hydrogenous fraction of organic rich shales, thus the time when the shale was deposited can be dated.
Canadian Journal of Earth Sciences
Canadian Journal of Earth Sciences ; 57 8 : — However, despite previous study, the formation and evolution of this deposit remains a key unknown in the tectonic evolution of the Eastern Kunlun Orogenic Belt. Moreover, the petrogenesis of the ore-bearing rocks and the nature of ore genesis are the subjects of ongoing debate. Here, we present detailed field observations, petrology, zircon U—Pb geochronology, and Re—Os isotopic analyses to constrain the timing and genesis of the Xiarihamu Cu—Ni sulfide deposit.
Four samples from the ore-bearing Xiarihamu mafic—ultramafic intrusions yielded zircon U—Pb ages of
Released Journal Article. Re-Os dating of pyrite confirms an early diagenetic onset and extended duration of mineralization in the Irish Zn-Pb orefield. Authors.
Devonian Keg River algal laminites produced an isochron date Ordovician kukersites from the Yeoman Fm. The unexpectedly low metal concentrations require an oxic interpretation of the kukersite depositional environment. Kukersites were likely rapid, shallow water deposits protected from grazing and burrowing by hypersalinity, rather than deeper anoxic deposits.
ID-NTIMS investigation of the association between various metals and specific organic ligands known as porphyrins revealed very good circumstantial evidence for the existence of Re porphyrins in the sedimentary environment, something never reported before. An Os blank correction performed on the solvent extracts indicates that most of the Os extracted from the rock is OS – to be expected on the basis of the Re-support, and their age.
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Old Style O. There were two calendar changes in Great Britain and its colonies, which may sometimes complicate matters: the first was to change the start of the year from Lady Day 25 March to 1 January; the second was to discard the Julian calendar in favour of the Gregorian calendar. Beginning in , the Gregorian calendar replaced the Julian in Roman Catholic countries.
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Rhenium–osmium dating, method of determining the age of the important ore 43 billion years; hence, the Re-Os system can be used to determine when.
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Democracy, literally, rule by the people. If you prefer to suggest your own revision of the article, you can go to edit mode requires login. Thank you for your feedback. The information presented below briefly outlines how Chemostrat is utilising two of these techniques, i. Re and Os become concentrated in the organic, hydrogenous fraction of organic rich shales, thus the time when the shale was deposited can be dated.
Furthermore, as Re and Os have been inherited from the source rocks, Os isotopes can be employed to correlate an oil with its source.
First in situ Re-Os dating of molybdenite by LA-ICP-MS/MS
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.
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Code, GBW Description, Reference Material for Re-Os Dating. Certificate. NMI Service Identifier. Measurement Service Sub-Category.