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Re-Os dating of galena and sphalerite from lead-zinc sulfide deposits in Yunnan Province, SW China
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.
Rhenium-osmium (Re-Os) dating of two molybdenite samples from the alkali granite and pegmatite of Ambalavayal in northern Kerala (S. India) yielded ages of.
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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. 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 for Re-Os molybdenite dating.
Our study opens new avenues to explore the effects of isotope nuggeting in geochronometers. Ore deposits are the main source of metals for society, and their efficient and sustainable exploration requires a precise understanding of the factors that control their distribution within the upper crust. Rhenium is radioactive and decays to radiogenic Os by beta emission. The Re-Os system follows the law of radioactivity where the total number of Os atoms in the sample at the present time is equal to the number of atoms of Os incorporated in the sample at the time of mineral formation and the Os atoms produced by decay of the Re parent radionuclide.
Due to their chalcophile affinity and behavior during partial melting of the mantle, Re and Os will be concentrated in sulphide phases usually at low ppb and ppt levels, respectively.
Old Style (O.S.)
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.
Re-Os dating of molybdenite constrains late-orogenic gneiss dome formation in the Sveconorwegian orogen, SW Scandinavia . Bingen, Bernard Stein.
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.
The Yamansu iron deposit is spatially and temporally associated with Carboniferous volcanism, and we propose that the magmatic magnetite ores were derived from iron-rich melt through melt immiscibility. The residual iron-rich magma ascended and erupted along with hydrothermal activity; then moderate to large amounts of hydrothermal massive, banded or disseminated magnetite formed with skarns.
Old Style and New Style dates
Listed below are questions that have been submitted by the community that the author will try and cover in their presentation. To submit a question, ensure you are signed in to the website. Authors or session conveners approve questions before they are displayed here. European Association of Geochemistry , an association registered in France, No.
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Morphologies Characteristics and Anomaly on Os Isotope Curve and the Comparison Dating Method for Polymetallic Crusts. Yang Wang1 and Nianqiao Fang1.
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.
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.
Dating of lead-zinc deposits is of critical importance for better understanding of ore genesis, but has long been a big challenge due to the lack.
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.
This change was implemented subsequently in Protestant and Orthodox countries, usually at much later dates. In England and Wales , Ireland , and the British colonies, the change to the start of the year and the changeover from the Julian calendar occurred in under the Calendar New Style Act In Scotland , the legal start of the year had already been moved to 1 January in , but Scotland otherwise continued to use the Julian calendar until Thus “New Style” can either refer to the start of year adjustment , or to the adoption of the Gregorian calendar.
In Russia , new style dates came into use in early Other countries in Eastern Orthodoxy adopted new style dating for their civil calendars but most continue to use the Julian calendar for religious use. When recording British history it is usual to use the dates recorded at the time of the event, [a] with the year adjusted to start on 1 January; but the start of the Julian year was not always 1 January and was altered at different times in different countries.
See New Year’s Day in the Julian calendar. From to , the civil or legal year in England began on 25 March Lady Day   ; so for example, the execution of Charles I was recorded at the time in Parliament as happening on 30 January 8 Old Style. The O.