This page provides a short tutorial leading through some steps that are required for obtaining U-Pb zircon ages using the UCLA ims ion microprobe:. Pb isotope intensity of zircon during O – ion bombardement is significantly enhanced if the sample surface is saturated with regard to oxygen. During zircon analysis, oxygen gas is leaked through a valve into the ims sample chamber. Note: in order to open EP10, EP11 or to vent the door, the leak valve has to be closed 1. At the beginning of an analytical session or when analytical parameters such as primary beam intensity or spot size were changed, energy offsets for all measured ion species must be determined. Centering the secondary ion image in the center of the field aperture FA is necessary for each new analysis spot because primary beam paths and conditions of secondary ion extraction vary over the area of the sample surface,in particular when spot-to-spot movements over large distances few mm are required. The sequence is as follows:. The mass range for each peak is set by two parameters:. Examples are shown for Pb, Pb, and Pb. Note that the Pb signal is typically too small to perform magnet centering on Pb directly.
K. V. Vijayadas
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Geochronology – Methods and Case Studies. In situ U-Pb dating combined with SEM images on zircon crystals represent a powerful tool to reconstruct metamorphic and magmatic evolution of basements recording a long and complex geological history [ 1 – 3 ]. The development of high spatial and mass resolution microprobes e. The growth of zircon crystals, evidenced by their internal microtextures, can be easily revealed by SEM imaging by Cathodoluminescence CL and Variable Pressure Secondary Electrons VPSE detectors on separated grains or in situ within a polished thin rock section [ 6 , 4 , 7 ].
In acidic magmatic rocks abundant zircon crystals provide precise age data about magma emplacement and origin of source indicating the geodynamic context and the pertinence of terranes forming the continental crust. As regards the metamorphic context, zircon can potentially preserves multiple stages of metamorphic records owing its highly refractory nature, high closure temperature and slow diffusion rate of Pb, thus it is an ideal mineral for U-Pb dating of poly-metamorphic rocks [ 9 , 10 ].
In addition, in situ analyses of trace elements such as rare earth elements REE in zircon and between zircon and coexisting minerals is usefull to decipher the REE behavior and mineral chemistry during metamorphism and to determine metamorphic P-T conditions [ 8 , 11 , 12 ]. In particular, garnet is one of the most important rock-forming minerals in high-grade metamorphic rocks since it can be also used to constrain metamorphic conditions if its composition is combined with that of other major minerals such as pyroxene and amphibole [ 13 , 14 ].
Relatively to REE partition in metamorphic rocks garnet, pyroxene, amphibole and zircon being competitors for REE partition, represent a usefull tool to outline continental crust evolution. In this paper we present the geochronological and chemistry data collected in the last ten years in Calabria and Peloritani sectors of Italy, utilizing the new analytical techniques, usefull to reconstruct the magmatic and metamorphic history of a key sector of the South European Variscan Belt in the peri-Mediterranean area.
Metaigneous and metasedimentary rocks of the Calabria-Peloritani Terrane Southern Italy represent a particularity in the South Mediterranean area being connected to Alpine chain Norther Italy through sedimentary Apennines Chain. They rapresent sectors of Variscan upper, intermediate and lower continental crust sutured by a thick layer of Carboniferous-Permian granitoids overlapped on Alpine oceanic crust units. Only rocks forming intermediate and deep crust levels of the continental crust were considered in this review.
These rock types preserve memory of Precambrian to Permian geological events and in some cases up to Mesozoic times.
She previously wrestled on the independent circuit , most notably for Chaotic Wrestling , where she once held the Chaotic Wrestling Women’s Championship. In , she and Charlotte Flair became the first women to headline a WWE pay-per-view event and the first to compete in a Hell in a Cell match both at Hell in a Cell in October , the first women to main event Raw in a women’s match since   and the first women to win the Pro Wrestling Illustrated award for Feud of the Year.
Mercedes Justine Kaestner-Varnado   was born in Fairfield, California , and later moved to various places, including Minnesota , to find schools and hospitals for her autistic brother  . Her family settled in Boston, Massachusetts , where she began her professional wrestling career. KV and Roxx quickly formed an alliance , teaming together regularly and accompanying each other to ringside.
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We are testing a new system for linking publications to authors. You can help! If you notice any inaccuracies, please sign in and mark papers as correct or incorrect matches. If you identify any major omissions or other inaccuracies in the publication list, please let us know. Kip V. Hodges, Ph. DOI: Active shortening within the Himalayan orogenic wedge implied by the Gorkha earthquake Nature Geoscience.
A review of the handheld X-ray fluorescence spectrometer as a tool for field geologic investigations on Earth and in planetary surface exploration Applied Geochemistry. In situ development of high-elevation, low-relief landscapes via duplex deformation in the Eastern Himalayan hinterland, Bhutan Journal of Geophysical Research F: Earth Surface. Science Advances. Flexural bending of southern Tibet in a retro foreland setting.
Scientific Reports. Evidence for pleistocene low-angle normal faulting in the Annapurna-Dhaulagiri region, Nepal Journal of Geology.
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This technique has proved reliable in dating relatively simple magmatic rocks 9 kV, beam current mA, pixel time ; for high-resolution images of Fig.
Here is a brief summary and explanation of the three not only two versions of the Masonic Funeral Music. Hope this helps some. The theory of Philippe Autexier from the Mozart Jahrbuch of goes like this. This Quartet is dated October 16, on its autograph. The next entry in the work catalogue is the vocal quartet K entered November 5 — still before the two Masonic brothers died. Thus all three of these pieces were entered after the brothers died — thus after Nov 7 but before the entry dated November 21, the vocal trio K One other important note here is Mozart designated the setting for the Masonic funeral music in his work catalogue for 2 Violins, 2 Violas, 1 Clarinet, 1 Bassetthorn, 2 Oboes, 2 Horns and Basso.
In the autograph the piece calls for 2 more Bassetthorns and a Contra Bassoon. Looking for a dating in July for the funeral music, Autexier found a clue in the Lamentation melody used in the middle of the work. He found the symbols of this theme to brought into connection with the ceremony of elevation to the Master, and a Master whose temple had been destroyed. One such case happened precisely in the summer of in Vienna.
Autexier hypothesised the music played that day was the music we know as the Funeral Music and was originally wrote for two part Man’s choir and orchestra. Two texts are preserved in a song collection that Mozart set to music, on poems of Gottlieb Leon, on this date also.
U-Pb zircon geochronology
The Verizon IndyCar Series, which stands on the precipice of a slightly reduced field for the season, may ensure a one-car retention if KV Racing can be saved from the brink. Accidents happened more often than not and Maldonado was frequently the butt of jokes for his driving style and propensity for finding the wall.
Still, he is and will always be a Grand Prix winner courtesy of his defense at the Spanish Grand Prix. Maldonado would be far from the first win it-or-wreck it caliber driver in IndyCar.
The Requiem in d minor KV was conceived by Mozart for four vocal soloists, chorus and orchestra. He began composing it in When he died in December of that year, the Requiem remained unfinished. This version was first published in His daring arrangement, omitting the vocal soloists and chorus and thus also the words of the Mass for the Death, remained manuscript and was only published at the end of the 20th century.
To arrange a vocal work for chamber music was not uncommon in those days. Joseph Haydn approved of the arrangement of his Creation for string quintet, published in by Anton Wranitzky. The first publication of the score was in Only six years later, in , an anonymous arranger published a version for string sextet of KV , using the title Grande Sestetto Concertante, per due Violini, due Viole, Violoncello primo concertante e Violoncello secondo.
The choice of a string sextet is extraordinary, as this type of string ensemble had only recently for the very first time been used by Luigi Boccherini, who had published his six sextets op. No other significant string sextets were known at the time of this arrangement, and it is not sure that the anonymous arranger had seen or heard the Boccherini pieces. For the present performances by Rusquartet both arrangements have been revised and occasionally rearranged by the musicians and me, whenever we felt that this would improve the arrangement.
Discrepancies between the arrangements and the Neue Mozart Ausgabe scores were as a rule solved by changing the text according to the NMA. Requiem KV Composer s :.
Piano Sonata No. 13 (Mozart)
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