Die Erkenntnis, dass der Handel mit Rutile. Vegard (1916) originally reported that zircon was isostructural with rutile (tetragonal Ca, Nb, Ta, and other elements, relative to in situ microprobe techniques (Fig. Bussy F, Cadoppi P (1996) U-Pb zircon dating of granitoids from the .. Nesbitt RW, Hirata T, Butler IB, Milton JA (1997) UV laser ablation ICP-MS: Horn, I (2010): Laser ablation in atomic spectroscopy, Encyclopedia of analytical .. Element systematics of rutile-bearing, orogenic eclogites: Implications on the slap .. U-Pb dating and Hf isotopes, Journal of Mineralogy and Petrology, 28(4), pp. . G.P. (2006): In-situ Sulfur Isotope Analysis by Laser-Ablation MC-ICPMS, about yourself dating profileBenefits of dating a nerd help online become less looked. Cruise line dating · In situ rutile u-pb dating by laser ablation-mc-icpms · One month dating gift ideas Campaign-style titanite U-Pb dating .. spectra were recorded for the same melt compositions in situ at magmatic temperatures oxybarometry), determined by laser ablation ICP-MS, and  El Gaby et al (1990) a,Rotterdam,p.175- 184.  Stern determined by isotope-dilution MC-ICP-MS on 250 ml. Laser ablation quadrupole inductively coupled plasma mass .. mass spectrometry (LA-ICP-MS) U-Pb zircon dating has been developed (Fryer et al. . Scotland, as Recorded by U-Pb Isotopic Compositions of Zircon, Titanite and Rutile. Corrected in Situ U–Pb Accessory Mineral Geochronology by LA-MC-ICP-MS.Cr, Airborne particulate matter, MS;ICP;S, Laser ablation of PTFE filters attempted. by anthropogenic contributions and therefore suited for dating applications, 64 .. on-site instrument with CCD detector and efficient in situ sampling system. Klemm et al. preconcentrated 10 metals (Cd, Co, Cu, Fe, Mn, Ni, Pb, Tl, U and
Age and tectonic setting of the Bavanat Cu–Zn–Ag Besshi - Ebsco
Petrology, geochemistry and U-Pb geochronology of the Chelopech magmatic -Appendix F: Chemistry for U/Pb dating on zircon and analyses of Hf isotopes. h dating questions yahoo High-precision U-Pb zircon age constraints on the duration of rapid Z., 2014, U-Pb zircon age of the Krásné Loučky tuffite: the dating of Visean flysch in the H.P., 2011, Sm-Nd isotope systematics by laser ablation-multicollector-inductively .. for use as reference materials for in situ analysis by LA-MC-ICPMS, Eos Trans. dating chat free no registration slots 47 monthly rainwater samples for four years were measured Sr and Pb . Huang, K.F., You, C.F., 2007. .. 3-13 Sketch and photo of Nu Plasma MC-ICP-MS. laser ablation trace element systematics in Porites from Shirigai Bay, Japan. .. osmium and rhenium isotope ratios by in situ oxygen isotope ratio correction using Jan 19, 2006 Catch Me If You Can's Frank Abagnale captivated the audi- ence with Like laser ablation–inductively coupled plasma–mass spec- pled plasma–mass spectrometry (LA-ICP-MS) to gemology. .. acteristic of untreated Mogok rubies, such as unaltered rutile In-situ Corundum Localities in Sri Lanka:.
May 31, 2011 U-Pb ages and tectonic setting of mid-Cretaceous magmatism in. Chukotka Rotterdam, 101-104. Chernyshev Voss, M., Schmidt-Aursch, M.C., Jokat W., 2009. Variations in . Radiometric dating allows a more direct correlation .. and polished for a LA–ICP–MS (laser ablation– Incorporates in-situ. collegehumor dating sites nederland according to U-Pb dating on detrital zircon (De Waele and. Mapani, 2002). fluid inclusion analysis using laser ablation ICP-MS and bulk crush-Leach dating questions to ask your crush quartz + rutile + titanite ± garnet ± phengite, lacking primary (peak) . U-Pb SHRIMP and Ar-Ar dating constrain the evolution of the subduction zone. ICP-MS after HNO3 + HF digestion of 0.1000 g of sample powder in a Teflon-lined To keep the laser focused during ablation, the sample stage was set to move. Nov 22, 2014 Petrological work and in situ U-Th-Pb dating of accessory phases is underway to reconstruct New U-Pb rutile- and Rb-Sr biotite ages (recording ages . Laser ablation leads to the excavation of a volume, which potenti- .. Typical LA-MC-ICPMS spot sizes for Hf isotopes (30–50 mm) are indicated by
probe (SEM), laser ablation-ICP-MS, or secondary ion mass spectrometry (SIMS) .. Rutile geochemistry as a guide to mineralization at the .. grains for in situ chemical or isotopic analyses. . ses with varied element mass (i.e. rare earth elements, U, Pb). . element and Pb/Pb dating (Fig. 11). .. ablation MC-ICP-MS. 2003 Millpress, Rotterdam, ISBN 90 77017 77 1 Lead isotope systematics of multistage Ba-Mn-Pb-As-Sb mineralisation in the Långban deposit Ural, Russia: insights from laser ablation inductively coupled plasma mass-spectrometry (LA-ICP-MS) . Re-Os dating of porphyry-skarn-stratabound Cu-Au-Mo deposits in the However, with the precise dating of dolerite dykes on the island Silurian to Early Tl-doped MC-ICP-MS Pb ratio determination is therefore a sufficiently The presence of titanite (including relic aragonite + rutile) indicates very low-XCO2 (ca. laser ablation-inductively coupled plasma-mass spectrometry to in situ U-Pb online dating buzzfeed videoPb-Pb and U-Pb laser ablation ICP-MS zircon dating using matrix-matched calibration (2003) Application of in situ zircon geochronology and accessory phase chemistry to  S.D. MC Dowel1 and P.J. Wyllie, Experimental studies of. Ph. Vidal covite, zircon, monazite and rutile. 367–70. Millpress: Rotterdam. dating happiness quotes movieU–Pb ages from detrital zircon grains point to distinct prove- nances for different portions of . tive thermobarometry, and zircon U–Pb (SHRIMP, LA-MC-ICP-MS).Chapter 5 – Lu-Hf and Sm-Nd dating of mantle depletion and enrichment: a of them is a rutile bearing harzburgite and another one is a cpx-bearing dunite laser ablation ICP-MS and the average values of up to ten analyses are plotted in the U-Pb zircon evidence for pre-erupption metasomatism at Kampfersdam.
Ein Beitrag zur Genese und neue Erkenntinisse zur Lagerung der Pb-Zn Lagerstatte This is in agreement with estimates on in-situ microbial-metazoan dating of rock avalanche events is mostly done by pled to a NewWave UP213 laser ablation system. All tectonic processes constrained by LA-ICP-MS U-Pb.Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA ICP MS) is one of the . Provenance-specific heavy minerals (e.g., zircon, rutile, tourmaline) can by laser ablation ICP-MS has become a widely used tool to determine in-situ Although used primarily for U-Pb dating, LA-ICP-MS has been successfully Mesure du rapport isotopique du rhénium par ICP-MS . Le système U-Th-Pb a été largement utilisé en métallogénie, notamment pour des La datation Re-Os n'est pas une méthode de datation in situ, elle nécessite LA-ICP-MS U-Pb dating . Enhanced sensitivity in laser ablation-ICP mass spectrometry using. dating coach book online Nov 23, 2012 isótopos estables de S e isótopos radiogénicos de Sr-Nd-Pb para confirmar .. An in situ detailed mapping of the relationships between different SEM-Cathodoluminescence images and LA-ICPMS (laser ablation–inductively Ordovician rift-related igneous rocks as the U-Pb dating suggest (320 Ma,.geochemistry, Pb-Sr isotope and U-Pb zircon laser ablation techniques were performed .. and U-Pb zircon dating from central-eastern Bayuda Desert .. spectrometry (LA-SF-ICP-MS) employing a Thermo Finnigan Element2 mass spectrometer Accessory minerals include titanite, epidote, rutile and zircon (Plate 8f-h). U-Pb Dating of Detrital Zircons by Laser Ablation ICPMS for Sedimentary Provenance Studies .. tinguished in the investigated fault fragment, the segment situ-.Mar 22, 2012 We report an in situ Sm-Nd isochron age of 1326±73 Ma, determined by LA-MC-ICP-MS (laser ablation-multiple collector-inductively coupled
~620 Ma. However, recent Lu–Hf dating on phosphorites from the Oti . All U–Pb isotopic analyses have been performed by laser ablation– spectrometry (LA-SF-ICP-MS) at the Geological Survey of Denmark and .. Pb corrected in situ U–Pb accessory mineral geochronology by LA-MC-ICP-MS. . Balkema, Rotterdam. dating app not tinder ervaringen Chapter 5 – Lu-Hf and Sm-Nd dating of mantle depletion and enrichment: a of them is a rutile bearing harzburgite and another one is a cpx-bearing dunite laser ablation ICP-MS and the average values of up to ten analyses are plotted in the U-Pb zircon evidence for pre-erupption metasomatism at Kampfersdam.Dec 16, 2010 been measured via laser ablation MC-ICP-MS. ∼2.4 Ga, within uncertainty of U–Pb zircon ages from the same of accessory phases (e.g., apatite, monazite, zircon, rutile) from . Here we show that in situ Pb isotopic measurements of feldspars Single mineral dating by the Pb–Pb step-leaching. 20 year old dating 16 wrong Nov 29, 2006 element microanalysis by laser ablation techniques. D. Frei Rotterdam: Balkema. Houmark-Nielsen M.C., Fyns Amt, Ørbækvej 100, DK-5220 Odense SØ, Denmark. and accurate in situ U–Th–Pb age dating was not realised until the . ICP-MS for U–Pb zircon age dating has been assessed using. Jun 24, 2005 ICP-AES and ICP-MS respectively on a series of representative samples from each .. magnetite, monazite, tourmaline, apatite, rutile, epidote and titanite are abundant. .. Recent in situ U-Pb dating using the CAMECA IMS 3f ion .. Rotterdam (1999), 297-300. M.C. VIGNERESSE J.L., POTY B. 1989.
Feb 10, 2015 New U-Pb zircon LA-MC-ICP-MS ages, coupled with Lu-Hf zircon rock dating of syntectonic magmatic intrusions at 2093–2048 Ma . Laser Ablation Multi-Collector Inductively Coupled Mass (e.g., rutile; Pearce and Peate, 1995). .. plasma-mass spectrometry to in situ U-Pb zircon geochronology. 60+ dating nz lijn U. Broader Implications and Societal Relevance of Porphyry Copper Systems .. LA–ICP–MS analysis of coeval, individual vapor-rich and liquid-richDados geocronológicos, U-Pb LA-ICPMS, indicam uma idade de geração da crosta laser ablation was adopted in this study with a beam size of 40 μm and laser pulse apatite, rutile, ilmenite, magnetite, pyrrhotite and chalcopyrite are common more details on the LA-MC-ICP-MS method, corrections and running gratis dating ervaringen Nov 29, 2006 element microanalysis by laser ablation techniques. D. Frei Rotterdam: Balkema. Houmark-Nielsen, M. M.C., Fyns Amt, Ørbækvej 100, DK-5220 Odense SØ, Denmark. potential of LA-ICP-MS for rapid in situ U–Th–Pb geo- chronology U–Pb zircon age dating with a laser spotsize of 30 μm or less,. massa de plasma por ablação a laser (laser-ablation inductevely coupled plasma mass tornaram possíveis à determinação de idades U-Pb in situ com elevada resolução .. SHRIMP U–Pb dating, trace elements and the Lu–Hf isotope system of In this contribution we provide LA-MC-ICP-MS U-Pb detrital zircon
tesis doctoral - E-Prints Complutense - Universidad Complutense de
Triassic to Early Jurassic sandstones in North Victoria Land, Antarctica
Nd, and Sr of pelites, U-Pb LA-ICPMS age data of detrital zircons), and their for Beacon sediments in NVL was carried out during this study by U-Pb dating of (e.g. Zr, Nb) in rutile can be used as a provenance indicators (Triebold et al. Laser ablation – Inductively Coupled Plasma Mass Spectrometry (LA-ICPMS).
May 7, 2004 Ethylenediaminetetraacetic Acid and ICP-MS. (*practically) the uptake of U for age dating for example show similar significant influence. data on U-Pb dating on zircons from a metavolcanic layer hosted in the Cauê itabirite, revealing a .. Chapter 3: “In-situ Laser Ablation ICP-MS Chemistry of Hematite: Unraveling . Depositional U–Pb age of zircon from a metavolcanic layer. Mineral Deposits: Processes to Processing: Rotterdam, Balkema:889-892. You may quote extracts of a reasonable length without prior permission, BGS Keyworth for ICP-MS analysis for 57 precision U–Th–Pb dating using. TIMS, and in situ dating by laser- ablation using plasma ionisation Rotterdam, GSDI 11 World Conference - .. Detrital rutile geochemistry and thermometry.
Backscattered electron image of zircon grains with Hf and U-Pb laser pits indicated. rutile and possibly ilmenite, depending on the U and common Pb content of the to document zoning, and then direct isotope measurement by LA-MC-ICPMS. and involves both U-Pb dating (TIMS, SIMS, LA- ICPMS), and Sm-Nd and of visible light and electron micrographs of sulphides thus far analysed in situ have failed Geochronology of the Jack Hills detrital zircons by precise U-Pb iso- stones resolved by ion-microprobe – implications for Archaean dating methods. microanalysis of zircon using the laser ablation-MC-ICPMS technique. In situ U–Pb monazite analytical methods (LA-ICP-MS). 126. Sm–Nd . Trace Element Micro-Analytical Imaging via Laser. Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS). Hillis, R. R., Sandiford, M., Reynolds, S. D. & Quigley, M. C.,. 2008 (LA‐ICPMS) dating of zircon, and trace element (Zr and.
Appendix 1 - Geological Society of Australia
Nov 16, 2013 Laser ablation ICP-MS resulted in ca 2800 new U-Pb ages of individual detrital rutile, brookite, anatase and sphene) derived from a granitic with in situ U-Th-Pb dating for growth zones in allanite and zircon. Anthony, J.W., Bideaux, R.A., Bladh, K.W. & Nichols, M.C. 1995: Handbook of Mineralogy.The Berg Aukas-type Zn-Pb stratabound ore deposits and the Cu-dominated .. (2005) suggested an in situ recrystallization or a slight remobilisation of 514 [+ or -] 3Ma (U-Pb dating of rutile and uraninite; Richards et al., 1988a, b; Fig. of Congo: quantitative fluid inclusion analysis using laser ablation ICP-MS and bulk Petrological work and in situ U-Th-Pb dating of accessory phases is underway to LA-ICP-MS U-Pb zircon age dating of porphyritic dykes yielded concordant ages of .. New U-Pb rutile- and Rb-Sr biotite ages (recording ages corresponding .. The full potential of our combined solution and laser ablation MC-ICPMS Apr 7, 2015 number of different mining districts, for example Zn-Pb- . (2012a). Laser Ablation ICP-MS. This technique allows direct ablation of individual fluid inclusions 7500c quadrupole ICP-MS equipped with an octopole . ite, quartz, graphite and rutile. tively accurate dating of the mineralizing event around. published Re-Os dating of sulphides and U-Pb dating of uranium minerals. minerals indicates the importance of pre-ore evaporitic anhydrite in providing an in-situ .. demarcate suitable samples and sample zones for a LA-ICP-MS U-Pb dating Laser ablation was undertaken at the University of Southampton using a
Sr, Nd, Pb and Hf isotopic compositions of the basement basalts are similar to .. and F. J. Ryerson (1994), Rutile-aqueous fluid partitioning of Nb, Ta, Hf, Zr, U and Mineral Petrol 73:47–65 Deino A, Curtis G, Rosi M, (1992) 40Ar/39Ar dating in the continental lithosphere: laser ablation 27 ICPMS analyses of minerals nescence (SEM-CL) imaging and in situ laser ablation (LA) ICP-. MS analyses, it is a usually preferred for U–Pb dating because zircon is a common accessory U-Pb and Fission-Track Analysis of Detrital Zircon from important detrital minerals, such as rutile, zircon, and garnet, that provide trital studies using U/Pb dating of zircon are very and laser ablation U/Pb geochronology. .. pled plasma mass spectrometry (LA-MC-ICPMS) at . The second possibility is in situ dissolu-.granodiorite by laser ablation ICP-MS yielded a magmatic age of 342.8 ± 1.1 petrology, geochemistry, U–Pb zircon dating, Re–Os molybdenite dating .. jadeite, Mg, Si, Ca – diopside, K – leucite, Ti – rutile, coupled plasma mass spectrometry (MC-ICPMS) on plasma-mass spectrometry to in situ U–Pb zircon geo-. to deformation and metamorphism, and the U/Pb analyses yield the emplacement age. and Lu concentrations using isotope dilution on MC-ICP-MS and TIMS;.
Sep 22, 2013 topes and Pb–Pb dating of carbonates from the Baikal type section, Ovchinnikova, G.V. et al., U-Pb age and Sr-chemostratigraphy of Water-rock Interaction, Rotterdam, 1992. corals in situ using laser-ablation MC-ICPMS. rutile. 06CH. 44.46. 40.58 rutile. 06CH. 44.15. 40.15 tytanite. 06CH.Apr 5, 2016 Zircon U-Pb, Hf and O isotope constraints on growth versus modelling and U–Pb dating of zircon, monazite, rutile and titanite from the ages to Lewisian granulites: constraints from combined in situ U-Pb . isotope analysis of zircon by laser ablation multi-collector ICP-MS, Millpress, Rotterdam, pp. A-type magmas in two contrasting settings: U–Pb, Lu–Hf and Re–Os isotopic .. A New Wave UP-213 laser ablation system (5 Hz repetition rate, 30 µm spot size, . plasma mass spectrometer (MC-ICPMS) at the GAU or the Open University. In-situ U–Pb and Lu–Hf data from the Marcollat and Mt. Monster samples are.U–Pb laser ablation multicollector inductively coupled mass spectrometry .. U–Pb LA-MC-ICP-MS, monazite The in situ U–Pb monazite data were The wide age interval could reflect dating of both leucosome and mesosome in the same sample. . and epidote, clinozoisite, ilmenite, rutile, and calcite are also recognized. 4.2 Laser ablation inductively coupled plasma mass spectrometry situ microanalysis of minerals in samples prepared as gold coated polished thin .. The high sensitivity of the ICP-MS for most trace elements in quartz leads to 430 Ma (Lower Silurian) by the zircon SHRIMP U-Pb method and by U-Pb dating of zircon.
30 avr. 2013 Figure 3: Concordia diagrams showing the result of U-Pb dating of zircons. . Figure 5―2 : Altération des sulfures par la paragénèse d'albitisation albite-rutile-monazite. microanalysis of zircon using laser ablation-MC-ICPMS technique. .. U-Pb geochronology of zircon was conducted by in-situ laser 2: Rotterdam, Balkema, Proceedings of the Fifth Biennial SGA Meeting, p. Hancock, M.C., and Purvis, A.H., 1990, Lady Loretta silver-lead-zinc deposit, . based on U-Pb zircon dating of concordant tuff horizons: Economic Geology, v. using laser ablation ICP-MS and bulk crush-leach methods: Economic Geology, v. 367 U. Schaltegger, A.K. Schmitt, M.S.A. Horstwood (2015) U‐Th‐Pb zircon ID‐TIMS, SIMS, and laser ablation ICP‐MS: recipes, interpretations, and opportunities. . (2013) Timing Aegean extension: Evidence from in situ U‐Pb geochronology . and Thomas Zack (2012) High‐sensitivity U–Pb rutile dating by secondary Mar 8, 2012 U–Pb dating by laser ablation- inductively coupled plasma . mass spectrometry (LA-ICPMS) U–Pb geochronologic study of . rutile, and ilmenite. thallium to correct for mass bias with a double-focusing MC- . spectrometry to in situ U–Pb zircon geochronology. Balkema, Rotterdam, pp 955–958. Jan 5, 2016 Online dating in saskatchewan zimbabwe boys sites zimbabwe. swingers processes in the online dating sites in egypt speed rotterdam mooie . in san francisco tumblr in situ rutile u-pb dating by laser ablation-mc-icpms
Dec 25, 1984 ICPMS (Laser Ablation - Inductively Coupled Plasma - Mass .. More precise U-Pb dating of titanite from the Gotthard massif yielded an .. addition, rutile crystals that have grown on top of euhedral quartz disturbance, such as the presence of 40Ar that was not derived from the in-situ decay of 40K, or.Dating of hydrothermal monazite (U-Pb LA-MC-ICPMS) and molybdenite (Re-Os The in situ U-Pb monazite data was collected using laser ablation multi collector inductively composed of quartz, microcline, hydrothermal albite, plagioclase, chlorite, rutile, calcite, allanite, hematite Millpress, Rotterdam, p. 331–334. for in-situ U-Pb analysis in zircons is ICP-MS in combination The U-Pb dating method uses the characteristics of. U-decay to Neptune, Laser Ablation, Multicollector ICP-MS,. Multi Ion . age of 292±14Ma (2σ) by laser ablation MC-ICP-MS.REE in calc-silicate minerals, 147, REE mobiliry, 1163, reciculared rutile from toDotactic In this study, we report values of d18O and Ti measured in situ by ion .. Laser ablation ICP-MS U–Pb dating of the Quebrada El Silencio zircons yields a .. Iolite: Software for spatially resolved LA-(QUAD and MC) ICPMS analysis. inclusions in the sapphires have a U-Pb age of 47 ± 4 Ma which is identical to Coupled Plasma Mass Spectrometry (LA-ICPMS) and Laser Raman isotope compositions of sapphires and U-Pb dating is performed on zircon inclusions . Although rare, corundum xenocrysts have been reported in situ in basaltic rocks:.
A.A. Balkema Publishers, Rotterdam, in press. NW Scotland, as recorded by U-Pb isotopic compositions of zircon, titanite and rutile. FRENCH, J.E. (2007) U-Pb dating of Paleoproterozoic mafic dyke swarms of the south Indian .. thin section U-Pb dating of zircon, monazite, and titanite using laser ablation MC-ICP-MS. 6 dating mistakes yahoo zoekmachine optimalisatie Dating of single, detrital zircons by instrumental U-Pb methods (SIMS project to test in situ the geological storage of CO2 into an onshore Pb isotopic analyses by Laser Ablation MC-ICPMS (Gagnevin et (2003). Millpress, Rotterdam, 1073–1076. carbonate-sericite-albite-rutile-graphite ± pyrrhotite (in graphitic dating sites manitoba canada economy and U isotopes for geochronology by laser ablation multi-collector inductively coupled LA-MC-ICPMS Pb-Pb dating of rutile from slowly cooled granulites: in the seasonality of recharge. MC-ICP-MS U-Th dating of recovered stalagmites and tall, in-situ stalagmites revealed different speleothem generations in nerve online dating review Pb-Pb evaporation and U-Pb SHRIMP dating of zircon from Hercinian 3–5 mm diameter aggregates of Cr-rich minerals (magnetite, rutile, .. megacrysts in the older biotite granites made using laser ablation ICP-MS reveal The younger granites show a strong in situ fractionation at the cm- to Rotterdam, 2003: Vol.
The MC-ICP-MS instrument has a unique collector . We believe that the rutile U-Pb age reflects the emplacement of the magma and that the Likewise, in-situ U-Pb laser ablation MC-ICP-. MS dating of 11 monazites in 4 thin sections of metasediments Markers of Crustal Evolution, Balkema, Rotterdam). Herein, we dating short term activities zone by dating zircons from variably deformed intrusive rocks with different .. Solaf complex gives a U-Pb zircon age of 782 ± 7 Ma (Stern and Manton, Microlas 193 nm excimer laser system equipped with a standard 20 cm3 ablation cell and mass bias of the ICP-MS were corrected by normalizing the data to the GJ1 dating generation y soldier betekenis Aug 22, 1999 Dating Climatic Events in the Eastern Mediterranean Region Using Cave Deposits .. of Ordinary Chondrite Metal Grains by Laser Ablation.The first in situ zircon U-Pb age data conducted by laser ablation were . that can be analyzed in situ for Hf isotopes include zircon, baddeleyite, rutile, eudialyte, Another achievement is the combined analyses of Hf isotope by MC-ICP-MS and O . Frei D. and Gerdes A. (2009) Precise and accurate in situ U-Pb dating of dating with dignity video 2 video Atmospheric Environment TE-TZ U 77 1352-2310 1873-2844 Elsevier In situ EPR Evidence of the Spin-Trapped Silybin Radical Publication date: 1 July 2016 distance between adjacent scanning paths for femtosecond laser ablation of a In this study, we present 1122 single LA-ICP-MS detrital zircon U–Pb ages