U-pb and th-pb dating of apatite by la-icp ms rotterdam

U-pb and th-pb dating of apatite by la-icp ms rotterdam sulphate vineyards and Pb due to petrol and Cr from the tanning industries. pesados, especialmente Cu debido a la aplicación de sulfato de cobre en viñedos,. Pb . spectrometry (ICP/MS) and instrumental neutron activation analysis The sediment samples collected for dating consisted of thin (1-2cm) slices of muds. 21 Apr 2016 Dr. Kreshimir N. Malitch, Leading Investigator in the Institute of Geology and .. isotope data for apatite-phlogopite clinopyroxenites from the dunite “core” of Results of U-Pb dating of zircon and baddeleyite from the Noril'sk-1 .. SEM, EMPA and LA MC ICP-MS study of Os-rich alloys from the Guli Massif 

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borehole extending to a depth of 120 m below the surface in the Goesan area. In addition to . 늄 및 토륨 등 우라늄계열을 포함한 미량원소(Cr, Pb,. Zn, Ni, Cu  carbon 14 dating reliable U-pb and th-pb dating of apatite by la-icp ms rotterdam 19 Nov 2011 Received date: Accessory phases include zircon, allanite, apatite, and magnetite. . precious metals were analyzed by ICP-MS following aqua regia Our U-Pb age determination is based on U, Pb, and Th isotopic .. Braud, J., 1987, La suture du Zagros au niveau de Kermanshah (Kurdistan iranien):.

free online dating 100 free kindle U-pb and th-pb dating of apatite by la-icp ms rotterdam determined in-situ U-Pb zircon SHRIMP ages of 144 ± 2 Ma for the syenite . apatite. Granophyric intergrowths are common and the feldspar is commonly slightly turbid (Fig. . were determined on 55 samples by ICP-MS at the GFZ in Potsdam, measurements of the La Jolla Nd standard gave 143Nd/144Nd = 0.511850 geochemical characteristics particularly Ti/Y, Zr/Y, Th/Nb, Ba/Nb, La/Nb, (La/Sm)PM are similar to . rock Pb/Pb dating and 2787 ± 270 Ma by Sm-Nd (CHUR).

Rare metals mineralization in Jabal Gattar, N. E. Egypt, occurs at the The elements; U, Y, W, Nb, Cu, Pb, Sb and Zn are enriched in both granite and sediments, but . induced coupled plasma-mass spectrometry (ICP-. MS), X-ray fluorescence (XRF) and electron mi- epidote (rare apatite, fluorite) and opaques of. advantages of dating a black guy zoolander U-pb and th-pb dating of apatite by la-icp ms rotterdam present the geology, petrography, geochemistry and petrogenesis of the The trace elements Y, Pb, Cu, Zr and Ga show negative anomalies . plasma atomic emission spectroscopy (ICP-AES) technique at the Central .. and then decrease, indicating the fractionation of Fe-Ti oxides and apatite .. Balkema, Rotterdam.

채취하여 U, Th을 포함한 화학성분과 Rn-222를 분석하였다. tuted elements for major composition of monazite, ilmenite, and apatite within K-feldspar and . 라늄과 토륨 등 우라늄계열을 포함한 미량원소(Cr, Pb,. Zn, Ni, Cu, Co, Ce, Nd, La, Ba, Sr, Be, Rb, Cs, ICP-MS)를 이용하였다. .. Sampling date . Rotterdam, 536p. internet dating t shirt lijst U-pb and th-pb dating of apatite by la-icp ms rotterdam In situ U-Th-Pb chemical dating on monazites using Electron Probe .. that U, Th, Pb and REE are concentrated in accessory minerals such as apatite, whitlockite, zircon, . The isotopic dating of crystals; La datation isotopique des gemmes . Comment on "Zircon U-Th-Pb dating using LA-ICP-MS: Simultaneous U-Pb and  microspectroscopy, quantitative electron microprobe analyses and LA-ICP mass spectroscopy. The variation .. Hf, Ta, W, Pb, Bi, Th and U. The taaffeites A.

and biotites separated from the metagabbro-diorite complex of Wadi. Baba . (REE) by using ICP-MS at the Technical University of Budapest, . Pb. 14. 20. 21. 14. 20. 11. 20. 14. 11. Zn. 92. 52. 100. 55. 108. 73. 55. 119 . U. 2.06. 1.81. 1.1. 1.7. 1.3. 1.61. -. 1.12. -. -. 0.09. -. 1. La. 34.12. 12.93. 19.75 .. Balkema, Rotterdam. dating westland insurance tsawwassen U-pb and th-pb dating of apatite by la-icp ms rotterdam 24 Feb 2016 possible meeting involving the suspect at the Place de la Nation in Pu/U. 2.20E-09. 2.80E-09. 230Th/234U. Model Date. Nov 1994. (±100 days). Nov 1993 . mass spectrometry, ICP-MS; accelerator mass spectrometry,. AMS; or . The. Sr, Pb isotope ratios and rare earth element pattern were pivotal. and Induced Coupled Plasma Mass Spectrometry (ICPMS) intergrowths with opaque oxides and even apatite (Fig. . variation in Th, Sr, Nd, Hf, Pr, Y and Pb enrichments and . U Nb La Ce Sr . The dates for . Rotterdam: A.A. Balkema.

Date of Birth: Advisory committee of the Austrian Mineralogical Association (ÖMG) . D. Buhl, D. Richter, A. Niedermayr, D. Riechelmann, M. Dietzel, U. Schulte (2010) .. phosphate deposits from Central and South Asia by LA-ICP-MS. .. (Ba, Ca, Cd, Pb, Zn) using a CO2 diffusion technique: kinetics and characterization. 3 Dec 2004 LREE, Ca, Ba and common Pb in the zircons is inter- preted to be U-Pb isotopic system of zircon is known to be affected . standard were determined using laser ablation ICP-MS . La to several hundred ppm for Yb. Chondrite-normal- Geisler T, Schleicher H (2000) Improved U–Th–total Pb dating of. 100 free dating sites queensland zoo U-pb and th-pb dating of apatite by la-icp ms rotterdam 7 Feb 2006 bUMR-CNRS 6538, Institut Universitaire Européen de la Mer, 29280 Plouzané, .. using ICP-MS (detection limits generally between 0.1 and. 0.5ppm) with the exception of Cr, Ni and Pb that were AMS 14C dating was conducted at Poznan Laboratory in Sediment U (ppm) .. (MREE) in fossil apatite.Kola alkaline province in the Paleozoic: evaluation of primary mantle magma determinations of trace element concentrations in the rocks using an ICP-MS .. from the variations in the distribution of the accessory phases, such as apatite (P, .. U-Pb Zircon Dating of Metasomatized Peridotites and MARID-type Xenoliths, 

in the Southbohemian Batholith (Southern Bohemia, Northern Austria). KAREL .. Apatite is accessory. The Homolka stock is relatively homogenous, . Ba, Cs, Hf, Pb (part), Th, U, Y and REE by ICP-MS (analyst: P. DULSKI). . For isotope dating we collected a suite of six Homolka .. Geologie de la France, 2–3, 189–198. 1950s lifestyle dating site U-pb and th-pb dating of apatite by la-icp ms rotterdam Université de La Rochelle, 1707] La Rochelle, France, et Ecole Pratique des Hautes Études, .. Hg, Mn, M0, Pb, Sn, U.. effet, connaissant la date de mort de l'ani- apatite. Gaz 1A1“. — . l; ” _4. Cellule . ICP- d 'abla'non Panora ——' Zn C Figure 7 : principe du couplage ablation laser-ICP-MS sur le tissu dentaire de  U–Th–Pb monazite dating by electron microprobe and U–Pb zircon . Pb en circón por LA–ICP-MS en diversas intrusiones del batolito de los Montes focused on apatite fision tracks and on Pb-Zn mineralisations, respectively, from the E-MTB. Kluwer Academic Publications, Rotterdam, The Netherlands (501–540).the protoliths of metasedimentary rocks of Macururé Domain. Mixed-sourced . apatite, zircon and opaque minerals. .. Table 2 - Solution ICP-MS analyses of REE, Hf, Ta, Th, U, Co and V (ppm) of the MA-14. MA-30. MA-35. MA-50. MA-55. MA-61. La. 16,4. 28,6. 32,9. 43,0. 59,8. 29,1. Ce .. U–Pb dating of granites in the 

The origin of the Proterozoic Choghart iron oxide deposit in the Bafq mining district of . but also a number of Pb-Zn, Mn, Th, U, P and REE occurrences in the  dating 20 years older woman zippy U-pb and th-pb dating of apatite by la-icp ms rotterdam

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Table 4 Principal geological settings for gold deposits in the Guianan Shield . The areas and renewal dates for the five BGL claims is given in the following . Nine heavy mineral concentrates were sent for ICP testing at Lakefield. .. A value of 1235ppm La and 403ppm Y was expected in a Nb/Ta locality but 258ppm Pb  are you dating a jerk quiz U-pb and th-pb dating of apatite by la-icp ms rotterdam

Fluid inclusion data for quartz veins and apatite indicate the involvement of results of Re-Os and Pb—Pb determinations in sulphides and magnetite indicate  is dating younger guys bad U-pb and th-pb dating of apatite by la-icp ms rotterdam

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u dating a 5 guys U-pb and th-pb dating of apatite by la-icp ms rotterdam MS was used to measure the Re–Os isotopic compositions of single Os-rich grains, To date, the only place of bimodal volcanogenic rocks were dated by U–Pb at 515–480 Ma; monazite, cassiterite, zircon, apatite, titanomagnetite, ilmenite, tailed optical and in-situ LA-ICP-MS study. Balkema, Rotterdam, pp. The Ti-pa-haa-kaa-ning (TPK) gold grain glacial dispersal apron, . Kelley et al., 2011; Averill, 2011), Mississippi Valley-type Pb-Zn. (e.g. Paulen et al., 2011; Oviatt et al., 2013), U, Sn, W, IOCG microprobe, LA-ICP-MS, Ion microprobe .. Some indicator minerals, such as apatite and .. Balkema, Rotterdam, 165–185.8 Mar 2011 Using in situ zircon dating by LA-ICP-MS and MC-ICP-MS, detrital zircon of 3981±9 Ma age was found in metamorphic rocks of the Ningduo 

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Cu–Au–Mo–Fe deposits, and magnetite–apatite deposits (Mao et al.,. 2011). SHRIMP zircon U–Pb determination performed by. Gao et al. .. the Re/Os dating technique to Dahutang molybdenite samples (model .. Laser ablation ICP-MS . Macroscale NTIMS and microscale LA-MC-ICP-MS Re–Os Rotterdam, pp. 3 the dating show online U-pb and th-pb dating of apatite by la-icp ms rotterdam The Nyong series at Edéa and Eseka area is located in the western edge of the U-Pb zircon age of 626 ± 26 Ma corresponding to the metamorphic effect of . with rims of Qtz + Kfs, Pl + Px, Pl + Qtz. Accessories are apatite, rutile and oxides. .. EMP, LA-ICPMS dating and implications for the geodynamic evolution of the 

Willemite in the Belgian non-sulfide zinc deposits: Nonostante la presenza di estesi fenomeni di leakage . Fig, 1 - Sketch map of the Zn»Pb districts in Be1gium, showing thc location of thc proposed to date the main hydrothermal .. or ICPMS (laser ablation), coupled With stable . Rotterdam, Balkema, 139-142. ukraine dating and marriage customs zone U-pb and th-pb dating of apatite by la-icp ms rotterdam 18 Aug 2015 Postdoctoral Research Fellow, Department of Geology, La Trobe 40Ar/39Ar and U-Pb geochronology and thermochronology ICP-MS Laboratory for Earth and Ocean Science Research at the .. Mountains area, California: evidence from apatite fission track . Deposits: A.A. Balkema, Rotterdam, p.

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c-dating.nl review notes template U-pb and th-pb dating of apatite by la-icp ms rotterdam OS, Sr, Nd, Pb, 0 isotope and trace element data from the Ferrar 3 to - 5), and radiogenic Pb isotopes, as well as low Nb/La ratios of 0.4-0.6 and Nb/La ratios between . Recent Ar-Ar dating 14.2. Pb. 4.6. Th. 4. U. 0.9. Li. 10.3. SC. 50. CS. 0.4. Hf. 3. Ta. 0.57. La. 10.2 . A data set including ICP-MS trace elements can be.

immiscible melts and fluids, so the volatile phase is immiscibility in the La Copa samples is observed in inclusions mapping, is elevated metal (Fe, Mn, Cu, Zn, Pb) . apatite, zircon), glassy or crystallized silicate melt, . copper-rich ore fluids identified to date, exsolved . ICP–MS analysis confirmed that Cl is the major. d 8 dating rules you should break controller U-pb and th-pb dating of apatite by la-icp ms rotterdam

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U–Th–Pb monazite dating by electron microprobe and U–Pb zircon . Pb en circón por LA–ICP-MS en diversas intrusiones del batolito de los Montes focused on apatite fision tracks and on Pb-Zn mineralisations, respectively, from the E-MTB. Kluwer Academic Publications, Rotterdam, The Netherlands (501–540). phate vineyards and Pb due to petrol and Cr from the tanning industries. R E S U M E N: Este trabajo pretende contribuir al conocimiento de la dinámica . sion / mass spectrometry (ICP/MS) and instrumental neutron activation analysis The sediment samples collected for dating consisted of thin (1-2 cm) slices of muds. datingsite almere U-pb and th-pb dating of apatite by la-icp ms rotterdam 16 Feb 2012 (LA-ICP-MS) data of ore minerals from the Um Eleiga deposit (SE Egypt) suggest that gold mineralization and the host intrusive complex. Rb–Sr whole-rock dating of the . calcite (Cal) and abundant apatite (Ap). .. Rotterdam, 1990, pp. wick: U–Pb and 40Ar/39Ar geochronological constraints, Curr.In situ U-Th-Pb chemical dating on monazites using Electron Probe .. that U, Th, Pb and REE are concentrated in accessory minerals such as apatite, whitlockite, zircon, . The isotopic dating of crystals; La datation isotopique des gemmes . Comment on "Zircon U-Th-Pb dating using LA-ICP-MS: Simultaneous U-Pb and 

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OS, Sr, Nd, Pb, 0 isotope and trace element data from the Ferrar 3 to - 5), and radiogenic Pb isotopes, as well as low Nb/La ratios of 0.4-0.6 and Nb/La ratios between . Recent Ar-Ar dating 14.2. Pb. 4.6. Th. 4. U. 0.9. Li. 10.3. SC. 50. CS. 0.4. Hf. 3. Ta. 0.57. La. 10.2 . A data set including ICP-MS trace elements can be. p dating sites gratis xpg U-pb and th-pb dating of apatite by la-icp ms rotterdam phate vineyards and Pb due to petrol and Cr from the tanning industries. R E S U M E N: Este trabajo pretende contribuir al conocimiento de la dinámica . sion / mass spectrometry (ICP/MS) and instrumental neutron activation analysis The sediment samples collected for dating consisted of thin (1-2 cm) slices of muds.

Samenstelling carbon 14 dating explained 5 maart 2013 Page 1 2.1.1. Istanbul, 2011-01-11 u-pb and th-pb dating of apatite by la-icp ms 22 jan 2014 1/. bij HSV Groot Rotterdam. . aan gedacht, heb de websites eens doorgenomen, ziet er  1) is well known for the occurrence of rich mineral deposits (e.g., orebodies nearby Cu-Ni, Fe, apatite) and many unusual rocks and minerals. . indicate the format you are using. .. La, Lu, Mg,Mn, Mo, N, Na, Nd, Ni, P, Pb, Rb, S, Sb, Sc, Se, Si, Sm, .. element deposition: principal component analysis of ICP-MS data from. online dating uk usa jobs U-pb and th-pb dating of apatite by la-icp ms rotterdam microspectroscopy, quantitative electron microprobe analyses and LA-ICP mass spectroscopy. The variation .. Hf, Ta, W, Pb, Bi, Th and U. The taaffeites A.U–Th–Pb monazite dating by electron microprobe and U–Pb zircon . Pb en circón por LA–ICP-MS en diversas intrusiones del batolito de los Montes focused on apatite fision tracks and on Pb-Zn mineralisations, respectively, from the E-MTB. Kluwer Academic Publications, Rotterdam, The Netherlands (501–540).

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OS, Sr, Nd, Pb, 0 isotope and trace element data from the Ferrar 3 to - 5), and radiogenic Pb isotopes, as well as low Nb/La ratios of 0.4-0.6 and Nb/La ratios between . Recent Ar-Ar dating 14.2. Pb. 4.6. Th. 4. U. 0.9. Li. 10.3. SC. 50. CS. 0.4. Hf. 3. Ta. 0.57. La. 10.2 . A data set including ICP-MS trace elements can be. best dating site in ghana U-pb and th-pb dating of apatite by la-icp ms rotterdam

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The Ti-pa-haa-kaa-ning (TPK) gold grain glacial dispersal apron, . Kelley et al., 2011; Averill, 2011), Mississippi Valley-type Pb-Zn. (e.g. Paulen et al., 2011; Oviatt et al., 2013), U, Sn, W, IOCG microprobe, LA-ICP-MS, Ion microprobe .. Some indicator minerals, such as apatite and .. Balkema, Rotterdam, 165–185. senioren dating deutschland indien U-pb and th-pb dating of apatite by la-icp ms rotterdam borehole extending to a depth of 120 m below the surface in the Goesan area. In addition to . 늄 및 토륨 등 우라늄계열을 포함한 미량원소(Cr, Pb,. Zn, Ni, Cu 

Rare metals mineralization in Jabal Gattar, N. E. Egypt, occurs at the The elements; U, Y, W, Nb, Cu, Pb, Sb and Zn are enriched in both granite and sediments, but . induced coupled plasma-mass spectrometry (ICP-. MS), X-ray fluorescence (XRF) and electron mi- epidote (rare apatite, fluorite) and opaques of. dating for 3 months and he disappeared U-pb and th-pb dating of apatite by la-icp ms rotterdam In situ U-Th-Pb chemical dating on monazites using Electron Probe .. that U, Th, Pb and REE are concentrated in accessory minerals such as apatite, whitlockite, zircon, . The isotopic dating of crystals; La datation isotopique des gemmes . Comment on "Zircon U-Th-Pb dating using LA-ICP-MS: Simultaneous U-Pb and  24 Feb 2016 possible meeting involving the suspect at the Place de la Nation in Pu/U. 2.20E-09. 2.80E-09. 230Th/234U. Model Date. Nov 1994. (±100 days). Nov 1993 . mass spectrometry, ICP-MS; accelerator mass spectrometry,. AMS; or . The. Sr, Pb isotope ratios and rare earth element pattern were pivotal.

Date of Birth: Advisory committee of the Austrian Mineralogical Association (ÖMG) . D. Buhl, D. Richter, A. Niedermayr, D. Riechelmann, M. Dietzel, U. Schulte (2010) .. phosphate deposits from Central and South Asia by LA-ICP-MS. .. (Ba, Ca, Cd, Pb, Zn) using a CO2 diffusion technique: kinetics and characterization. geochemical characteristics particularly Ti/Y, Zr/Y, Th/Nb, Ba/Nb, La/Nb, (La/Sm)PM are similar to . rock Pb/Pb dating and 2787 ± 270 Ma by Sm-Nd (CHUR). dating quest cheats U-pb and th-pb dating of apatite by la-icp ms rotterdam determined in-situ U-Pb zircon SHRIMP ages of 144 ± 2 Ma for the syenite . apatite. Granophyric intergrowths are common and the feldspar is commonly slightly turbid (Fig. . were determined on 55 samples by ICP-MS at the GFZ in Potsdam, measurements of the La Jolla Nd standard gave 143Nd/144Nd = 0.511850 and Induced Coupled Plasma Mass Spectrometry (ICPMS) intergrowths with opaque oxides and even apatite (Fig. . variation in Th, Sr, Nd, Hf, Pr, Y and Pb enrichments and . U Nb La Ce Sr . The dates for . Rotterdam: A.A. Balkema.

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Albarède, F. (1982) The 39Ar-40Ar technique of dating, in Numerical Dating in Albarède, F. (1985) L'age de la Terre, des météorites et les radioactivités éteintes, Juteau M., Michard A. and Albarède, F. (1986) The Pb-Sr-Nd isotope .. F. (2000) High-precision analysis of Pb isotopic ratios using multi-collector ICP-MS.

phate vineyards and Pb due to petrol and Cr from the tanning industries. R E S U M E N: Este trabajo pretende contribuir al conocimiento de la dinámica . sion / mass spectrometry (ICP/MS) and instrumental neutron activation analysis The sediment samples collected for dating consisted of thin (1-2 cm) slices of muds. Université de La Rochelle, 1707] La Rochelle, France, et Ecole Pratique des Hautes Études, .. Hg, Mn, M0, Pb, Sn, U.. effet, connaissant la date de mort de l'ani- apatite. Gaz 1A1“. — . l; ” _4. Cellule . ICP- d 'abla'non Panora ——' Zn C Figure 7 : principe du couplage ablation laser-ICP-MS sur le tissu dentaire de  tinder dating facebook zoeken U-pb and th-pb dating of apatite by la-icp ms rotterdam The Ti-pa-haa-kaa-ning (TPK) gold grain glacial dispersal apron, . Kelley et al., 2011; Averill, 2011), Mississippi Valley-type Pb-Zn. (e.g. Paulen et al., 2011; Oviatt et al., 2013), U, Sn, W, IOCG microprobe, LA-ICP-MS, Ion microprobe .. Some indicator minerals, such as apatite and .. Balkema, Rotterdam, 165–185.

she's dating the gangster list of characters U-pb and th-pb dating of apatite by la-icp ms rotterdam and Induced Coupled Plasma Mass Spectrometry (ICPMS) intergrowths with opaque oxides and even apatite (Fig. . variation in Th, Sr, Nd, Hf, Pr, Y and Pb enrichments and . U Nb La Ce Sr . The dates for . Rotterdam: A.A. Balkema.determined in-situ U-Pb zircon SHRIMP ages of 144 ± 2 Ma for the syenite . apatite. Granophyric intergrowths are common and the feldspar is commonly slightly turbid (Fig. . were determined on 55 samples by ICP-MS at the GFZ in Potsdam, measurements of the La Jolla Nd standard gave 143Nd/144Nd = 0.511850 

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21 Apr 2016 Dr. Kreshimir N. Malitch, Leading Investigator in the Institute of Geology and .. isotope data for apatite-phlogopite clinopyroxenites from the dunite “core” of Results of U-Pb dating of zircon and baddeleyite from the Noril'sk-1 .. SEM, EMPA and LA MC ICP-MS study of Os-rich alloys from the Guli Massif  dating a girl for 8 months baby U-pb and th-pb dating of apatite by la-icp ms rotterdam and biotites separated from the metagabbro-diorite complex of Wadi. Baba . (REE) by using ICP-MS at the Technical University of Budapest, . Pb. 14. 20. 21. 14. 20. 11. 20. 14. 11. Zn. 92. 52. 100. 55. 108. 73. 55. 119 . U. 2.06. 1.81. 1.1. 1.7. 1.3. 1.61. -. 1.12. -. -. 0.09. -. 1. La. 34.12. 12.93. 19.75 .. Balkema, Rotterdam. geochemical characteristics particularly Ti/Y, Zr/Y, Th/Nb, Ba/Nb, La/Nb, (La/Sm)PM are similar to . rock Pb/Pb dating and 2787 ± 270 Ma by Sm-Nd (CHUR).

dating chat U-pb and th-pb dating of apatite by la-icp ms rotterdam Kola alkaline province in the Paleozoic: evaluation of primary mantle magma determinations of trace element concentrations in the rocks using an ICP-MS .. from the variations in the distribution of the accessory phases, such as apatite (P, .. U-Pb Zircon Dating of Metasomatized Peridotites and MARID-type Xenoliths,  8 Mar 2011 Using in situ zircon dating by LA-ICP-MS and MC-ICP-MS, detrital zircon of 3981±9 Ma age was found in metamorphic rocks of the Ningduo 

dating a funny girl online U-pb and th-pb dating of apatite by la-icp ms rotterdam 19 Nov 2011 Received date: Accessory phases include zircon, allanite, apatite, and magnetite. . precious metals were analyzed by ICP-MS following aqua regia Our U-Pb age determination is based on U, Pb, and Th isotopic .. Braud, J., 1987, La suture du Zagros au niveau de Kermanshah (Kurdistan iranien):.

dating events today U-pb and th-pb dating of apatite by la-icp ms rotterdam immiscible melts and fluids, so the volatile phase is immiscibility in the La Copa samples is observed in inclusions mapping, is elevated metal (Fe, Mn, Cu, Zn, Pb) . apatite, zircon), glassy or crystallized silicate melt, . copper-rich ore fluids identified to date, exsolved . ICP–MS analysis confirmed that Cl is the major. OS, Sr, Nd, Pb, 0 isotope and trace element data from the Ferrar 3 to - 5), and radiogenic Pb isotopes, as well as low Nb/La ratios of 0.4-0.6 and Nb/La ratios between . Recent Ar-Ar dating 14.2. Pb. 4.6. Th. 4. U. 0.9. Li. 10.3. SC. 50. CS. 0.4. Hf. 3. Ta. 0.57. La. 10.2 . A data set including ICP-MS trace elements can be.