Laser-ablation split-stream ICP petrochronology

Kylander-Clark, Andrew R.C.; Hacker, Bradley R.; Cottle, John M.

doi:10.1016/j.chemgeo.2013.02.019

Cited by 387 publications

(267 citation statements)

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“…[18] In that study measurements of rare earth element abundances and U/Pb ages of single zircon grains on a single collector instrument were reported, while the hafnium isotope ratios were analysed simultaneously on a multicollector ICP-MS. The term LASS was established later by Kylander-Clark and co-workers, who determined U/Pb ages on a multicollector ICP-MS and rare earth element concentration on a single collector ICP-MS. [25] Since its first report in 2008, LASS became a routine technique to determine radiogenic isotopes and chemical composition of small or heterogeneous samples. [25] To our knowledge, however, LASS has never been applied to stable metal or metalloid isotope analysis with simultaneous chemical composition analysis.…”

Section: Analytical Methods For In Situ Isotopic and Elemental Analysismentioning

confidence: 99%

Development of routines for simultaneous in situ chemical composition and stable Si isotope ratio analysis by femtosecond laser ablation inductively coupled plasma mass spectrometry

Frick

Schuessler

Blanckenburg

2016

Analytica Chimica Acta

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. (2016) Si) on the micrometre scale in geological samples. In both routines, multicollector inductively coupled plasma mass spectrometry (MC-ICP-MS) is combined with femtosecond-LA, where stable isotope ratios are corrected for mass bias using standard-sample-bracketing with matrix-independent calibration. The first method is based on laser ablation split stream (LASS), where the laser aerosol is split and introduced simultaneously into both the MC-ICP-MS and a quadrupole ICP-MS. The second method is based on optical emission spectroscopy using direct observation of the MC-ICP-MS plasma (LA-MC-ICP-MS|OES). Both methods are evaluated using international geological reference materials. Accurate and precise Si isotope ratios were obtained with an uncertainty typically better than 0.23 ‰, 2SD, δ 30Si. With both methods major element concentrations (e.g., Na, Al, Si, Mg, Ca) can be simultaneously determined. However, LASS-ICP-MS is superior over LA-MC-ICP-MS|OES, which is limited by its lower sensitivity. Moreover, LASS-ICP-MS offers trace element analysis down to the µg g -1 -range for more than 28 elements due to lower limits of detection, and with typical uncertainties better than 15%. For in situ simultaneous stable isotope measurement and chemical composition analysis LASS-ICP-MS in combination with MC-ICP-MS is the method of choice.Keywords femtosecond laser ablation, inductively coupled plasma multicollector mass spectrometry, split stream, optical emission spectroscopy, stable silicon isotope ratios

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Section: Analytical Methods For In Situ Isotopic and Elemental Analysismentioning

confidence: 99%

Development of routines for simultaneous in situ chemical composition and stable Si isotope ratio analysis by femtosecond laser ablation inductively coupled plasma mass spectrometry

Frick

Schuessler

Blanckenburg

2016

Analytica Chimica Acta

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“…Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) was conducted at the University of California, Santa Barbara following Kylander-Clark, Hacker and Cottle (2013). The laser spot size, repetition rate and ablation rate were 30 μm, 4 Hz and~0.1 μm/ pulse, respectively.…”

Section: Zircon U-pb La-icp-ms Techniquementioning

confidence: 99%

Devonian magmatism in the western Sakarya Zone, Karacabey region, NW Turkey

Sunal

2012

Geodinamica Acta

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The Karacabey Pluton is a large magmatic body in the northwestern Turkey overthrust by the probable Triassic metamorphic rocks of the Lower Karakaya Complex. Both the metamorphic rocks and the Karacabey Pluton are unconformably overlain by a Lower Jurassic and younger sedimentary sequence. The Karacabey Pluton was regarded as a Carboniferous intrusion based on the previous K-Ar biotite geochronological data. Here, we provide new geological, geochemical and geochronological data from the Karacabey Pluton. Zircon U-Pb results from two samples yielded ages of 393.8 +/−2.7 to 395.9 +/−4.09 Ma, suggesting that the granitoids intruded in the crust throughout the Early to Middle Devonian. The Karacabey Pluton consists mainly of biotite and locally hornblende bearing granitoid with lesser amounts of S-type leucocratic granodiorite, all of which are cut by pegmatitic bodies. It belongs to the high-K calc-alkaline series with distinct Nb and Ta anomalies in multi-element spider diagram. Sr and Nd isotopes' initial values are 0.709-0.712 and 0.511-0.512, respectively. εNd(i) values range between −7.8 and −9.4. The isotopic characteristics of the rocks indicate lower crustal sources of both metapelitic and metaigneous origin. Geochemical features of the rocks suggest that they developed in an arc-related environment, along with the other Devonian granitoids described from the Biga Peninsula in northwest Turkey. The granitoid shows a low-temperature alteration/metamorphism marked by recrystallization of quartz, sericitization of the feldspar and formation of late chlorite, epidote and muscovite. Possibly because of these, the Ar-Ar biotite ages are scattered with a possible concentration at around Permo-Carboniferous boundary. Zircon (U-Th)/He geochronology suggests that after the granitoid was reburied during Early Jurassic to Early Cretaceous sedimentation, there was renewed uplift and erosion during the Late Cretaceous (Turonian), which is possibly related to the closure of the Intra-Pontide Ocean in the north.Keywords: Karacabey Pluton; Sakarya Zone; geochemistry; zircon U-Pb, biotite Ar-Ar and zircon (U-Th)/He ages IntroductionThe Sakarya Zone of the Pontides is an E-W trending belt bounded by Istanbul Zone in the north and by the Izmir-Ankara Suture in the south (Figures 1 and 2). It consists of a complex basement overlain by Jurassic and younger sedimentary sequence. The basement rocks of the Sakarya Zone can be divided into two separate parts: 1. Paleozoic plutonic and metamorphic rocks possibly related to the Variscan orogeny and 2. Triassic accretionary complexes with blueschists and eclogites, called as the Karakaya Complex (Okay & Göncüoğlu, 2004;Okay & Tüysüz, 1999;Okay, Satır & Siebel, 2006).Most of the plutonic rocks in the basement of the Sakarya Zone are of Carboniferous age (350-320 Ma, Figure 1). These can traced from the Kazdağ Massif in the Biga peninsula (308-329 Ma, Okay et al., 1996, through west of Ankara (~290 Ma, Okay et al., 2006, 319-327 Ma;Robertson, 2012) and Central Pontides (275-295 Ma, Nzeg...

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“…Untreated zircons from sample 10/225 were analyzed at the Department of Earth Science, University of California Santa Barbara, USA (UCSB), by Multi-Collector (MC) LA-ICP-MS (Nu Plasma, Nu Instruments Ltd., Wrexham, UK) [30], whereas all others presented in this study were analyzed by Quadrupole (Q-) LA-ICP-MS (Thermo Scientific iCAP Qs, Thermo Fisher Scientific, Waltham, MA, USA) at the Department of Geology, TCD, Dublin Ireland. Both laboratories utilized a Photon Machines 193 nm ArF Excimer laser equipped with a HeLex ablation cell, 91500 zircon [26] as a primary reference material and Plešovice zircon [27] as a secondary reference material.…”

Section: Instrumentationmentioning

confidence: 99%

Chemical Abrasion Applied to LA-ICP-MS U–Pb Zircon Geochronology

et al. 2014

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Zircon (ZrSiO 4 ) is the most commonly used mineral in U-Pb geochronology. Although it has proven to be a robust chronometer, it can suffer from Pb-loss or elevated common Pb, both of which impede precision and accuracy of age determinations. Chemical abrasion of zircon involves thermal annealing followed by relatively low temperature partial dissolution in HF acid. It was specifically developed to minimize or eliminate the effects of Pb-loss prior to analysis using Thermal Ionization Mass Spectrometry (TIMS). Here we test the application of chemical abrasion to Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) by analyzing zircons from both untreated and chemically abraded samples. Rates of ablation for high alpha-dose non-treated zircons are up to 25% faster than chemically abraded equivalents. Ablation of 91500 zircon reference material demonstrates a ca. 3% greater down-hole fractionation of 206 Pb/ 238 U for non-treated zircons. These disparities necessitate using chemical abrasion for both primary reference material and unknowns to avoid applying an incorrect laser induced fractionation correction. All treated samples display a marked increase in the degree of concordance and/or lowering of common Pb, thereby illustrating the effectiveness of chemical abrasion to LA-ICP-MS U-Pb zircon geochronology. OPEN ACCESSMinerals 2014, 4 504

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Laser-ablation split-stream ICP petrochronology

Cited by 387 publications

References 123 publications

Development of routines for simultaneous in situ chemical composition and stable Si isotope ratio analysis by femtosecond laser ablation inductively coupled plasma mass spectrometry

Development of routines for simultaneous in situ chemical composition and stable Si isotope ratio analysis by femtosecond laser ablation inductively coupled plasma mass spectrometry

Devonian magmatism in the western Sakarya Zone, Karacabey region, NW Turkey

Chemical Abrasion Applied to LA-ICP-MS U–Pb Zircon Geochronology

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