Add Material to Cart. NIST is an agency of the U. Department of Commerce. Purpose : NIST is collecting this information to permit the inventory, order, and purchase of materials and informatic reference materials by the public. Subsequent payment information is collected to enable supporting financial activities e. Information regarding the purchase is tracked for programmatic and mission activities e. Disclosure of this information is permitted under the Privacy Act of 5 U.
Time resolved rutile U/Pb data derived from LA-ICPMS – a case study from the North Pamir
Geosciences, 9 11 , doi The significant and continuous improvement of instrumentation and approaches has opened new fields of applications by extending the range of minerals that can be dated by this method. Following the development and distribution to the community of good quality reference materials in the last decade, rutile U-Pb thermochronology with a precision only slightly worse than zircon has become a commonly used method to track cooling of deep-seated rocks.
A method for in situ rutile U-Pb dating was developed using a multiple-collector (MC) ICPMS coupled to an excimer laser-ablation system. Compared with single.
Box , Beijing , P. E-mail: xieliewen mail. The advantages include high spatial resolution, high sample throughput, good precision and accuracy, and limited sample preparation. For the application of these techniques in U—Th—Pb geochronology, the main challenges involve ion counter drift, matrix differences between reference materials and samples, laser-induced downhole elemental fractionation and common lead corrections.
We review recent efforts to improve spatial resolution, calibrate ion counter drift, and correct for common lead contamination, elemental fractionation and matrix mismatching. Multi-collectors simultaneously measure all isotopic signals over flat-topped peaks so that 1 the detection efficiency is significantly improved and relatively high spatial resolution is obtained, 4,5 and 2 the effects of spectral skew and flicker noise from the plasma source or ablated particles are removed or significantly reduced, resulting in improved counting statistics and lower internal and external uncertainties in isotopic ratios.
Published in Contributions to Mineralogy and Petrology on February 10, Rutile is a common accessory mineral that occurs in a wide spectrum of metamorphic rocks, such as in blueschists, eclogites, and granulites and as one of the most stable detrital heavy minerals in sedimentary rocks. The advent of rutile trace element thermometry has generated increased interest in a better understanding of rutile formation. Rutile thermometry of the same detrital grains indicates former granulite-facies conditions.
The methods outlined in this paper should find wide application in studies that require age information of single spots, e.
Anorthite + Quartz + 2 Ilmenite = Garnet (Gr1Alm2) + 2 Rutile (GRIPS). (1) situ techniques enable accurate dating of heterogeneous rutile and are largely.
Geochronology is the science of providing ages of events in the history of the Earth and extraterrestrial material and of determining the temporal rates of geological processes by using a number of different dating methods. The ages can be absolute e. Most absolute dating methods rely on the analysis of radioactive isotopes and their radiogenic decay products.
A number of radioactive isotopes from different elements, such as uranium, thorium, rhenium, samarium, lutetium, rubidium and potassium are used for this purpose. Techniques exist to date practically all geological materials, from billions of years in age to historical records. For instance:.
Rutile U-Pb Geochronology
We implement several procedures that help combat these analytical issues. Pb and U. To decrease molecular interferences at Pb peaks and increase the signal:noise ratio, we also use the energy filter to only accept high-energy ions into the collector. Because common lead and the amount of molecular interferences vary by sample, energy filtering is not always used.
Grey shaded area outlined in black represents published age of standard measured by TIMS Luvizotto et al. Individual rutile U-Pb analyses typically take minutes per spot.
In this article we provide an overview of LA-MC-ICP-MS dating However, for extremely low Th/U ratios (
Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. DOI: Parrish and Matthew S. View via Publisher. Save to Library. Create Alert. Launch Research Feed. Share This Paper. Laura Bracciali Compositional modification and trace element decoupling in rutile: Insight from the Capricorn Orogen, Western Australia. Kylander-Clark Figures and Tables from this paper.
Figures and Tables.
Passarelli; Miguel A. Basei; Oswaldo Siga Jr. Sproesser; Vasco A. It provides reliable and accurate results in age determination of superposed events.
Start Connecting With Singles From Ukraine Or Anywhere Around The World. Join Now!
Reviews in Mineralogy and Geochemistry ; 83 1 : — Rutile TiO 2 is an important accessory mineral that, when present, offers a rich source of information about the rock units in which it is incorporated. It occurs in a variety of specific microstructural settings, contains significant amounts of several trace elements and is one of the classical minerals used for U—Pb age determination. Here, we focus on information obtainable from rutile in its original textural context.
We do not present an exhaustive review on detrital rutile in clastic sediments, but note that an understanding of the petrochronology of rutile in its source rocks will aid interpretation of data Shibboleth Sign In. OpenAthens Sign In. Institutional Sign In.
Metrics details. These sampled both oceanic brecciated material and a blackwall reaction zone in contact with a micaschist and serpentinized peridotite. Textural observations combined with new geochronological data indicate that rutile and titanite both grew below their closure temperatures during Alpine metamorphism. We present a technique to calculate the most precise and accurate ages possible using a two-dimensional U—Pb isochron on a Wetherill concordia.
Rutile from two samples gave a U—Pb isochron age of Titanite from three samples gave a U—Pb isochron age of
Rutile U-Pb thermochrono-logy as a tool to constrain time-resolved cooling such as 40Ar/39Ar thermochronology and (U-Th)/He dating.
Chemical analyses show that rutile included in other minerals Rt inc commonly show higher SiO 2 and FeO contents and lower Nb 2 O 3 and ZrO 2 contents if compared with rutile in the matrix of the garnet-rich layer Rt mat. Cr 2 O 3 concentrations are quite similar in both types of rutile. Rt mat commonly shows a greater variability in minor elements, especially Nb 2 O 3 0. Few compilations of geochemical and geochronological data on rutile in Variscan metabasites can be found in literature, thus these data represent a new insight on a mineral phase the significance and scientific interest of which are rising in the last years.
Future studies on the origin and ages of emplacement and metamorphism either prograde or retrograde of this kind of rock, widespread in the Variscan chain, will benefit from these data as a term of comparison. Part of these data mainly Rt inc belongs to the supplementary material of .