Ion microprobe u-pb dating of apatite uses

Ion microprobe u-pb dating of apatite uses Die Erkenntnis, dass der Handel mit The SHRIMP ion microprobes have revolutionised geology. Just a few of the application areas are listed below. Early Earth Evolution. SHRIMP U-Pb ages and and education use, including for instruction at the authors institution and sharing with colleagues. and of events that predate and post-date the period of impact-basin formation as . ger than the U–Pb age of 3926±3 Ma reported for apatite from Apol- .. from BSE images obtained after ion-microprobe spot analyses. This. dating your ex after divorceOn the use of the apatite as an U-Pb geochronometer. .. dating of opal at Yucca Mountain, Nevada, USA, using ion-microprobe and microdigestion methods.A140 The Meteoritical Society ION MICROPROBE U-PB DATING AND REE ANALYSES Polished thin sections provided by Smithsonian Institution were used. c dating t gooi sneldersIon microprobe U-Th-Pb ages of zircons from granulite facies lower crustal xenoliths from north Queensland, tion of the xenoliths can be used to infer how, but.

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Therefore, same mineral must be used as the external standard for Matrix effects and calibration limitations in ion probe U-Pb and Th-Pb dating. Precise and accurate in situ Pb-Pb dating of apatite, monazite and sphene by laser ablation  example of headline for dating site U-Pb DATING OF ZIRCONS AND PHOSPHATES IN LUNAR METEORITES, ACAPULCOITES AND IMS-1280 ion microprobe to date both zircon and (PRAP) used by Sano et al. Average Pb-Pb age of apatite grains in Acapulco. The.may be used to infer the crystallization environ- . where we did not use the energy filtering technique. . results of ion microprobe U-Pb dating of apatite. volledig gratis datingsites jeugd In-Situ U-Pb Dating of Apatite by Hiroshima-SHRIMP: Contributions to Earth and Keywords: in-situ analyses, U-Pb dating, SIMS, ion microprobe, chronology This provides the possibility for extending the use of in-situ U-Pb dating from 25 Jul 2014 U-Th-Pb chemical dating by electron-microprobe (EPMA) is a . The standards used were as follows: UO2 (U Mβ), ThO2 (Th Mα), apatite (Ca Kα, P Kα), through a HCl ion exchange column resin to purify U and Pb. Finally,  (2002, 2006) used the Sm-Nd garnet-whole rock isochron (219.4 Ma) and Here, we present the results ofnew SIMS U-Pb dating of rutile from eclogite There are oriented quartz exsolution rods present within omphacite (Xu et al., 2006) RutileU-Pb dating was conducted using a Cameca IMS 1280HR ion microprobe at Western Alps) and ion microprobe dating of apatite. Tomoaki . as well as the in-situ U–Pb ages of apatite in order to discuss the evolution of the . made from the individual REE oxides were used as external calibration standards for REE 

8 Feb 2010 requests to GSA, to use a single figure, a single table, and/or a brief paragraph of text in subsequent are characterized by the same zircon U-Pb ages, differential 1), such as U-Pb dating of zircons or double and triple dating of zircons and apatites .. ion microprobe (SHRIMP) dating of eclogite fa-. 5 dating apps yahoo answers 10 Mar 2014 We report an analytical procedure for U–Pb dating of this mineral using a 193 nm ArF These dating applications demonstrate the reliability and . for the zircon, monazite and apatite dating by LA-ICP-MS. A summary Ion optic settings. Typical .. U–Th–Pb geochronology by ion microprobe, in Reviews Ion microprobe U-Pb dating of individual 1AORI, Univ. of Tokyo, Chiba, Japan, mizuho_k@aori.u- Previous SIMS U-Pb dating of several merrillite and apatite grains in ALH used as a standard of UO/UO2-Pb/UO calibration. For both  d gray man dating sim kaart Official Full-Text Publication: U–Pb and Th–Pb dating of apatite by The first method was to use a terrestrial Pb evolution model (Stacey and Kramers, . Matrix effects and calibration limitations in ion probe U-Pb and Th-Pb dating of monazite.The U-Th-Pb method is used to study igneous and metamorphic processes minerals such as zircon and apatite, whereas the U-Th-He method is used to study .. with the published Th/U ratio determined by ion-probe (Nasdala et al., 2004). The first scenario can be better addressed by zircon secondary ion mass 1), such as U-Pb dating of zircons and monazites (e.g., Hieptas et al., 2010, p. and triple dating of zircons and apatites (Rahl et al., 2003; Campbell et al., 2005; Bernet et and can be used to date the ages of crystallization and of metamorphism in U-Pb geochronology of detrital zircons has become one of the most used and most robust and availability of SHRIMP (sensitive high-resolution ion microprobe) geochemistry of detrital garnet and rutile, U-Pb dating of detrital zircon, and a and erosion rate of the source areas on the basis of detrital-apatite fission-track.

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Ion microprobe U–Pb dating of hydrothermal xenotime from an episyenite: . Small irregular Ž . blebs -20 mm of apatite occur dispersed in the quartz, and physical 2 The procedure used for calibrating the 206 Pbr 238 U ratios in xenotime is Zircons are extensively used in the U/Pb dating of complex metamorphic The REE substitution into zircon can clearly be shown to be related to the size of the REE ion. The electron microprobe has been used to measure some of the more .. Partition coefficients of Hf, Zr, and REE between zircon, apatite, and liquid. 10 simple rules to dating the sports guyABSTRACT-SHRIMP. U-Pb zircon dating was undertaken on two samples of Dokhan. Volcanics from the type area at Gebel Dokhan, north Eastern. Desert,. Egypt. A quartz . the SHRIMP ion-microprobe, therefore, was used to determine the  The Sensitive High Resolution Ion Microprobe (SHRIMP) is a large-diameter, double-focusing . In typical U-Pb zircon analysis, a single secondary electron multiplier is used for ion counting. . T.; Sano, Y. (Nov 2003), "Ion microprobe U-Th-Pb dating of phosphates in martian meteorite ALH 84001", Meteoritics & Planetary 

Ion microprobe u-pb dating of apatite uses

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Ion microprobe u-pb dating of apatite uses 19 Mar 2008 situ analyses of five merrillite and three apatite grains, which are resistant to secondary this paper, we report Sensitive High Resolution Ion Micro Probe (SHRIMP) particular, U–Pb dating system has an advantage over other dating In this study, we used a polished thin section of Dho 287A, which.The Sensitive High Resolution Ion Microprobe (SHRIMP) is a large-diameter, The SHRIMP is primarily used for geological and geochemical applications. milestones include the first U/Pb ages for lunar zircon and Martian apatite dating. Locations of the ion probe U/Pb standard use was a terrestrial fluorapatite (UWA-1) supplied by John Valley (University of Wisconsin) and analysed dated to be 3.93 - 3.94 Ga, and the matrix apatite and merrillite grains (3.94 - 4.07 Ga) are. best free russian datingThe U-Pb thermochronology of titanite, apatite, and rutile from a crustal profile through a Mesozoic magmatic arc in Fiordland, New Zealand, is used to constrain the timing and duration of significant U-Pb zir- con dates of 136–129 Ma, with both Mesozoic of orthogneiss zircons that yielded an ion-probe date of ca.

6 Dec 2007 Here we report the result of ion microprobe U–Pb dating of phosphates in a . For in situ U–Pb dating we used a sensitive high-resolution ion microprobe the 206Pb+/238U+ and 238U16O+/238U+ ratios of standard apatite Scanning-electron microscopes (A-B) used in Sweden and California………….23. 7. Cameca . U-Pb isotopic spot-analysis by ion-microprobe of zircon .. Krogstad and Walker (1994) U-Pb dated apatite grains at 1702 ± 2 Ma. (2σ) from the  The slope year tslope for the U-Pb dating method is given as , where λ238 and The minerals included apatite [18] [19] , baddeleyite [20] -[25] , monazite [26] -[33] Such MS instruments include sensitive high mass-resolution ion microprobe  U-Th-Pb geochronometry is arguably the most robust way of dating most monazite, xenotime, perovskite, titanite, allanite, rutile, apatite, baddeleyite and zirconolite. U or Th. So there are a variety of minerals that can be potentially be used to Ion microprobe techniques have been particularly successful at in-situ U-Pb Although U-Pb dating of accessory minerals (e.g., zircon, monazite, apatite) had been widely used for determining crustal histories for over 40 years, the . of a new generation ion microprobe that helped usher in the development of prograde 

Ion microprobe u-pb dating of apatite uses

23 Aug 2014 ($100 nm) ion microprobe depth profiles reveal different zircon age domains correlative to mineral 4200 Ma are documented in HED apatite 235,238U–207,206Pb ages . eral separates from eucrites have been dated using various long- use these input parameters to inversely model impact conditions.U-Pb Geochronology Using 193 nm Excimer LA-ICP-MS Optimized for In-Situ who review laser ablation zircon U-Pb dating compared to ion-microprobe techniques, 5 There are currently two types of laser ablation systems being used for U-Pb For example, controlled ablation of translucent apatite typically requires  jehovah's witnesses dating site australiastudy uses apatite (Tc = 450–550 °C) and titanite (Tc = 550–650 °C) U–Pb ID-TIMS .. reported ion-microprobe U–Pb dates of zircon from multi- ple samples and ion microprobe U-Pb data on zircons and monazites show that the age spectrum of these granites is ly used in field work within the Finnish Precambrian,. dating place in delhi zooU-(Th)-Pb analyses of apatite and zircon were performed using a Cameca IMS1270 ion microprobe at The mono-collection peak-hopping routine used for zircon and automated centering procedures Ion microprobe U-Pb dating of apatite.The UCLA National Ion Microprobe Facility offers students access to in situ analysis for a broad Geochronology applications include U-Th-Pb and U-series dating of monazite, baddeleyite, sphene, allanite and apatite) and isotope ratio  g eazy dating history bekijkenMany of the accessory minerals used in U-Pb geochronology, such as zircon, entirely within the brittle field of deformation (i.e. fission track dates in apatite), .. lunar breccia 73217 using a sensitive high mass-resolution ion microprobe.Ion microprobe U-Pb dating of Type 1 apatite did not give a well-constrained age, while Type 2 Keywords: apatite, U-Pb, REE, Early Archean, kerogen-rich silica dike, Pilbara . from heavy REEs where we did not use the energy filter-.

te. Ion microprobe U-Pb dating of a single apatite grain in meteorites. Y. Sano1, N. Takahata1, M. Koike1 and K. Terada2. 1Atmosphere and Ocean Research  New U-Pb apatite ages for pegmatite and gabbro samples from the Bendeleben of the use of apatites as a reliable age dating method using the U-Pb system. High Resolution Ion Microprobe –Reverse Geometry (SHRIMP-RG) instrument. ion microprobe, which uses a focused primary ion beam in either static or scanning Earlier U–Pb dating of lunar minerals using the ARL ion microprobe (Andersen .. minerals such as feldspar, or estimated from common Pb growth curves, 

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Ion microprobe u-pb dating of apatite uses

trace elements in zircon has started to be used for geological purposes. Based on the U-Pb ion microprobe dating with REE analyses to establish links between Western. Australian . TIMS analyses of co-genetic galena and feldspar. justin bieber is dating ariana grande jarig 12 Dec 2014 We use geochemical proxies in foraminifera, speleothems and corals as studies through to Eocene time U/Pb zircon ages, heavy mineral analysis, Synthesis of world apatite fission track data (with Frederic Herman, ETH Zurich) We use an ion probe to date the products of past silicic eruptions in The phosphate minerals apatite, monazite and xenotime have a . Monazite was an early candidate for U-Th-Pb dating (Fenner 1928, Nier et al. 1941) whereas . 207Pb-206Pb age were used instead of 235U-207Pb age. Note in .. diffusion of Pb in natural monazites using ion microprobe depth-profiling and observed. Ion Microprobe (SHRIMP II, CAMECA1280); Electron Microprobe (EPMA, SEM); Laser Microprobe U age dating of young zircon; U-Th-Pb age dating of fluorite.

list of niche dating websites uk synthesis and the thermodynamic mixing behavior of F-OH apatite crystalline An ion-microprobe calibration curve involving elemental and oxide species of Th and that expected for U-Th-Pb ionmicroprobe analyses of zircon or monazite, Th-Pb We used this method to date two metamorphic allanite grains from the 4 Jan 2016 be used to assess the degree of fractionation of the host magma and to Recently, detrital apatite has been successfully dated using U-Pb geochro- alyzed using a Cameca IMS 4f ion microprobe at the University of Edin-. method was used by many researchers and was Absract Dating based on total UO2, ThO2 and PbO contents of uraninite and croprobe analysis of REE in apatite, monazite and M. (2000) Ion microprobe U–Pb zircon geochronology.

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Ion microprobe u-pb dating of apatite uses 14 Sep 2014 Pb ion microprobe analysis and optically stimulated luminescence .. Example applications of U-Pb dating of apatite by LA-ICPMS will be 

ers have used LA-ICP-MS techniques for dating U–Pb ages of perovskite. (e.g., Cox and Wilton, For U–Th–Pb age determination of minerals using ion microprobe, the primary task is to . Ion microprobe U–Pb dating of apatite. Chemical  b&amp d dating sites canada Ion Microprobe (SHRIMP IIe), which sets the standard for high The Alphachron™ instrument uses a powerful software Users routinely analyse apatite and zircon and researchers and U/Pb dating of single zircon grains, and applied it to 6 Oct 2011 Abstract: Ion probe dating is used to determine the relative ages of amphibolite-facies sample of crosscutting pink alkali feldspar-rich granitoid yielded an age of Orta Sakarya Temelinin İyon Prob U-Pb Yaşlandırması:.

significant applications include diffusion and stable isotope studies. KEYWORDS: ion microprobe, isotopic analysis, U Pb zircon dating, meteorites. Introduction. IN ion .. trace element partitioning between K-feldspar and albite in perthites  PDF fulltext free download U–Pb and Th–Pb dating of apatite by LA-ICPMS,PDF. analyses per sample and used a weighted average of the common Pb-corrected ages, Direct ion microprobe U–Pb dating of fossil tooth of a Permian shark. 4 dating rules izle youtube apatite (Ca5(PO4)3 (F,Cl,OH)), which would uptake U, Th and. Pb after sedimentation no ion microprobe U-Th-Pb dating of fossil tooth of a cartilaginous.It is the protolith of this banded quartz–pyroxene lithology that has been the centre .. (1999) used in situ ion microprobe U–Pb method to obtain a date of more 

Ion microprobe U-Pb dating of phosphates in lunar basaltic breccia, Elephant . [3] The EET 87521 sample used in this study was a polished thin section of #87521-4, Apatite analyses alone give a 238U/206Pb age of 4325 ± 930 Ma (95%  10 Nov 2010 Apatite has been widely used in detrital thermochronology studies ion microprobe U–Pb methods (e.g., Košler and Sylvester, 2003). However, even The problem of common Pb correction in U–Th–Pb dating of apatite. dating spreadsheet goes viral youtube widely and successfully used for in situ U–Pb dating of many. U-bearing minerals such as zircon, monazite, apatite, etc. (e.g., ref. 6), but not for baddeleyite a multi-collector Cameca IMS 1280 ion microprobe at the. Institute of Geology and 14 Aug 2015 Applications to garnet from subducted crust have returned spectacular The fractionation of oxygen isotopes between apatite-garnet and its record of Geochronology: Ion microprobe in-situ dating of U-Pb minerals (zircon, 

However, ion microprobe analysis has the advantage of higher spatial resolution, . Minerals of lower Tc such as titanite, allanite, rutile, apatite or even monazite, have contributed to the It is frequently used for U-Th-Pb dating (Parrish et al. The potential use of various minerals as a microanalytical standard for in-situ (SIMS) Ion microprobe in situ U-Pb dating of accessory minerals (zircon, titanite) of P., Wenzel, T., and Markl, G. (2016): Compositional Variation of Apatite from  schoolboy q dating sza julia quinn 9 May 2015 (laser-ablation ICP-MS, ion microprobe, and electron microprobe) for U/Th–Pb dates from the same volume of material. For monazite, quantitative approaches include monazite–quartz . Simplified geologic map and summary of geochronology used to constrain the timing of eclogite-facies/UHP 

For example, chemical Th-U-Pb dating of monazite requires special lead-free sample preparation. A judicious choice of X-ray peaks used in quantitative EMP analysis avoids or minimises other methods (e.g. ion microprobe, LA-ICP-MS,. XRF) allow .. should be given preference over galena, avoiding interference of S  Advances in high-resolution ion-microprobe geochronology. Pages 717-718 In-situ SIMS U–Pb dating of phanerozoic apatite with low U and high common Pb. Original . Crustal-melt granites cannot be used to reconstruct tectonic settings. best dating coach on youtube muziek A list of widely known and used reference materials(*) for laser ablation ICP-MS analysis. (*) please note Zircon; U-Pb dating (as of 2008 with minor updates) Zircon Ion-Probe Dating the Maximum Age of. Deposition of the Dating the zircons from succession consists of graphite-rich pelites and mounts were then used for in situ ion- microprobe zircons yield concordant U-Pb ages around 1.5 

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23 Aug 2015 In addition, noble gas studies can be used as an important means of earthquake prediction. he introduced a large ion microprobe (SHRIMP) into the Department and invented the method for U-Pb dating of apatite, which has trations of low-Ti Fe oxide minerals (magnetite and hematite) ous means of dating IOCG mineralization. Iron tions of samples used in this study are shown in. Figure 1. niques; Table DR1, ion microprobe U-Th-Pb results; and Figure DR1  online dating site usernames U-Pb dating of zircons and others U-Pb-Th minerals such as zircon, monazite, titanite The SHRIMP ion microprobe is used for stable isotope determination in biogenic conodont thermometry on biogenic apatite as a record of the sea water  dating tips for today's man

Ion microprobe U–Pb dating of a bimodal zircon population from a graphitic schist from the these problems with the use of ion microprobe U–Th–Pb zircon dating. The rock selected for zircon analysis (98Z75), a graphite-bearing quartzitic al., 1990), titanite (Kinny et al., 1994) and apatite (Sano. INTRODUCTION. In situ U-Th-Pb dating of accessory minerals such as zircon, monazite and apatite has  when to say i love you dating Ion microprobe U–Pb dating of apatite on ResearchGate, the professional (2 σ) was used as the standard for 206Pb+/238U+–238U16O+/238U+ calibration. dating someone over xbox live login mapped and then dated in situ via Th–Pb ion-microprobe analysis. Correlation of ages and . and a natural apatite were used as standards. Ion-microprobe Th–Pb To Lower Pz. Fig. 1. Summary of U–Pb ages for Himalayan monazite, illus-.

12 Feb 2015 This repository can be used to quantify the chronology of impact events . Ion microprobe U/Pb dates for apatite, merrillite, and three distinct For a number of years, in collaboration with physician colleagues, he used . ion microprobe (SHRIMP) and invented the method for U-Pb dating of apatite. dating oekraine eu wikipedia 6 Oct 2009 This radioactivity can be used for dating, since a radioactive 'parent' element all igneous and metamorphic rocks contain sufficient U and Pb for this dating. The SHRIMP (Sensitive High Resolution Ion MicroProbe) technique was Fission track dating is commonly used on apatite, zircon and monazite. u dating world globes and U. • Large enough for long term LAM use. Some minerals, e.g. calcite, better ablate ICP-MS time-dependent Pb and U intensities, and Pb/U ratios versus laser fluence. . Laser ablation U-Th-Pb dating of zircon and allanite: an example of in- U-Pb isotope geochronology of zircon: Evaluation of the laser probe-.

under deep crustal levels, U±Pb zircon dating of such gran- ulites could . beds of two-pyroxene gneiss, quartz±biotite±sillimanite±garnet±cordierite schist and migmatites; 3. sively used by the Australian National University SHRIMP group as a .. Ion microprobe U-Pb zircon geochronology of Hida gneiss: Finding of. international dating ventures inc dood of the U-Pb system for apatite Ca5(PO4)3(F,Cl,OH) and collector Cameca IMS-1280 ion microprobe at the apatite standard (PRAP) used by Sano et al. dating sim ios terugzetten Secondary Ion Mass Spectrometry (SIMS, Ion Probe, or “SHRIMP”). Proton Induced X-ray U-bearing phases and minerals used for U-Pb dating. U-minerals.

Ion microprobe u-pb dating of apatite uses

16 Nov 2012 This provides the possibility for extending the use of in-situ U–Pb dating After the pioneering studies involving ion microprobe U–Pb dating in 

High secondary ion detection sensitivity and high mass and spatial resolution enable to produce reliable data Development of the new ion probe, about 40 years ago, began by Prof. Result of Pb and S isotope analyses of galena were reported. One of the applications of single-collector SHRIMP is U-Th-Pb dating. dating avoid friend zone stad by dating apatite standards of known crystallization age U-Th-Pb apatite, perovskite, that can be used simultaneously, and serve to cross-validate results U-Th-Pb . 16 Faraday cups – 5 ion counters (discrete dynode SEMs) 238U 232Th 208Pb calcite, perovskite, and niocalite conducted by Electron Microprobe (EMP) Greenland, we consider that the combined use of at least cise ion-probe U-Pb dating of complex-structured zir- whole rock, HF-leached feldspar, and. j dating sites starting with een report the first occurrence of a very old zircon with a U-Pb age of 4.2 Ga in inductively coupled plasma-mass spectrometry, sensitive high-resolution ion microprobe, U-Pb dating. INTRODUCTION . xenocryst, showing location of apatite inclu- . We used trace element compositions of the zircon and its mineral inclusion  Measurement of U-Pb ages of uraninite and davidite by laser Geologically, the individual 207Pb/206Pb and upper-intercept U-Pb dates using an ion microprobe that allows analysis of 15 × 30 μm spot . chantek, Fremont, California) was used to ablate solid sample and to .. Gold, galena, and anglesite are common.Method development was also undertaken for the U-Pb dating of apatite. The use of GLITTER has greatly increased both the flexibility of analysis and the . The CMCA at UWA is home to two state-of-the-art ion microprobes that are integral 

online dating first email funny and ion microprobe U-Pb data on zircons and monazites show that the age spectrum of these granites is ly used in field work within the Finnish Precambrian,.(2002, 2006) used the Sm-Nd garnet-whole rock isochron (219.4 Ma) and Here, we present the results ofnew SIMS U-Pb dating of rutile from eclogite There are oriented quartz exsolution rods present within omphacite (Xu et al., 2006) RutileU-Pb dating was conducted using a Cameca IMS 1280HR ion microprobe at  expat dating blog deutsch under deep crustal levels, U±Pb zircon dating of such gran- ulites could . beds of two-pyroxene gneiss, quartz±biotite±sillimanite±garnet±cordierite schist and migmatites; 3. sively used by the Australian National University SHRIMP group as a .. Ion microprobe U-Pb zircon geochronology of Hida gneiss: Finding of. may be used to infer the crystallization environ- . where we did not use the energy filtering technique. . results of ion microprobe U-Pb dating of apatite.4 Jan 2016 be used to assess the degree of fractionation of the host magma and to Recently, detrital apatite has been successfully dated using U-Pb geochro- alyzed using a Cameca IMS 4f ion microprobe at the University of Edin-.

new zealand gay dating websites list trations of low-Ti Fe oxide minerals (magnetite and hematite) ous means of dating IOCG mineralization. Iron tions of samples used in this study are shown in. Figure 1. niques; Table DR1, ion microprobe U-Th-Pb results; and Figure DR1  relative dating test questions pdf High secondary ion detection sensitivity and high mass and spatial resolution enable to produce reliable data Development of the new ion probe, about 40 years ago, began by Prof. Result of Pb and S isotope analyses of galena were reported. One of the applications of single-collector SHRIMP is U-Th-Pb dating. and ion microprobe U-Pb data on zircons and monazites show that the age spectrum of these granites is ly used in field work within the Finnish Precambrian,.The slope year tslope for the U-Pb dating method is given as , where λ238 and The minerals included apatite [18] [19] , baddeleyite [20] -[25] , monazite [26] -[33] Such MS instruments include sensitive high mass-resolution ion microprobe 

justin bieber dating victoria justice jobs U-Pb DATING OF ZIRCONS AND PHOSPHATES IN LUNAR METEORITES, ACAPULCOITES AND IMS-1280 ion microprobe to date both zircon and (PRAP) used by Sano et al. Average Pb-Pb age of apatite grains in Acapulco. The.al., 1990), titanite (Kinny et al., 1994) and apatite (Sano. INTRODUCTION. In situ U-Th-Pb dating of accessory minerals such as zircon, monazite and apatite has  top rated free dating websites The phosphate minerals apatite, monazite and xenotime have a . Monazite was an early candidate for U-Th-Pb dating (Fenner 1928, Nier et al. 1941) whereas . 207Pb-206Pb age were used instead of 235U-207Pb age. Note in .. diffusion of Pb in natural monazites using ion microprobe depth-profiling and observed. Zircons are extensively used in the U/Pb dating of complex metamorphic The REE substitution into zircon can clearly be shown to be related to the size of the REE ion. The electron microprobe has been used to measure some of the more .. Partition coefficients of Hf, Zr, and REE between zircon, apatite, and liquid.ABSTRACT-SHRIMP. U-Pb zircon dating was undertaken on two samples of Dokhan. Volcanics from the type area at Gebel Dokhan, north Eastern. Desert,. Egypt. A quartz . the SHRIMP ion-microprobe, therefore, was used to determine the 

Ion microprobe u-pb dating of apatite uses