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Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. A Nature Research Journal. Understanding the distribution of parent Re and radiogenic daughter Os isotopes in molybdenite is critical in interpreting isotopic measurements because it can compromise the accurate determination and interpretation of mineralization ages. In order to resolve the controls on the distribution of these elements, chemical and isotope mapping of MoS 2 grains from representative porphyry copper-molybdenum deposits were performed using electron microprobe and nano-scale secondary ion mass spectrometry. Our results show a heterogeneous distribution of , Re and Os isotopes in MoS 2 , and that both Re and Os isotopes are not decoupled as previously thought.

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.

Re-Os Dating of Pyrrhotite from the Chaoshan Gold Skarn, Eastern Yangtze Craton, Eastern China. Article (PDF Available) in International Geology Review.

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First in situ Re-Os dating of molybdenite by LA-ICP-MS/MS

My downloads. Find publications, data and maps managed by the Yukon Geological Survey. Re-Os dating of gold in gold-bearing orogenic vein systems in the Klondike district — progress report. General Information Related Publications.

Corpus ID: Re-Os dating of algal laminites: reduction-enrichment of metals in the sedimentary environment and evidence for new geoporphyrins.

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.

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.

Highly precise Re-Os dating for molybdenite using alkaline fusion and NTIMS

Yang Wang 1 and Nianqiao Fang 1. Create citation alert. Buy this article in print.

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Dissecting the Re-Os molybdenite geochronometer

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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.

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The radioactive decay of Pt to Os has a half-life of (3)× years (which is longer than the age of the. Rhenium–osmium dating. Keep Exploring Britannica.

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 In combination with previous research, drill core observations and Re—Os data provide robust evidence for multiple pulses of magma replenishment throughout the process of ore genesis. Based on this evidence, the large-scale magmatic Cu—Ni mineralization in Xiarihamu likely occurred in a post-collisional setting related to tectonic slab breakoff. Shibboleth Sign In. OpenAthens Sign In. Institutional Sign In.

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Re-os dating

The Triassic collision between the North China and Yangtze Cratons which generated numerous granitoid intrusions such as the Shangcheng, Xingxian and Lingshan intrusions, and other small stocks, such as Tangjiaping, Dayinjian, Mushan and so on. Those shallow-emplaced granite porphyries are closely related to porphyry-skarn Mo and Mo-W deposites, forming the Dabie molybdenum metallogenic belt.

Molybdenum deposits occur in the endo- and exocontact zones of the porphyry, include with three major types of Mo mineral systems, i. The ore-forming ages of the molybdenum deposits in Dabie area are mainly cluster Request Permissions.

Precise Re-Os Dating of Molybdenite from the Northern Dabie Molybdenum Belt in Central China and its Geodynamic Implications. Article Preview.

The Yamansu iron deposit, hosted in submarine volcanic rocks, is located in the Aqishan-Yamansu Fe-Cu metallogenic belt of eastern Tianshan, Xinjiang. New pyrite Re-Os, and pyroxene diorite intrusion ages and the chemistry of magnetite constrain the origin of the deposit. The Yamansu orebodies display banded or lenticular forms and sharp contacts with marble and garnet skarn.

Pyrite associated with magnetite from hydrothermal massive ores has a Re-Os isochron age of However, the pyroxene diorite age Magnetite samples from different ores in the Yamansu deposit are suggested to have a magmatic-hydrothermal origin. Moreover, magmatic and hydrothermal magnetite samples show different characteristic normalized rare earth element REE and trace element patterns. A combination of ore fabrics, discrimination diagrams, and normalized patterns for magnetite samples can reflect the magmatic-hydrothermal process.

Abstract Details

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.

Re-Os dating of molybdenite. $$ per model age. CCIM: ReOS fees scaled to source of funds ?page=reos-services.

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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