scholarly journals Exploring the law of detrital zircon: LA-ICP-MS and CA-TIMS geochronology of Jurassic forearc strata, Cook Inlet, Alaska, USA

Geology ◽  
2019 ◽  
Vol 47 (11) ◽  
pp. 1044-1048 ◽  
Author(s):  
Trystan M. Herriott ◽  
James L. Crowley ◽  
Mark D. Schmitz ◽  
Marwan A. Wartes ◽  
Robert J. Gillis
Keyword(s):  
Mass Spectrometry ◽  
Detrital Zircon ◽  
Inductively Coupled Plasma ◽  
Matrix Effects ◽  
Upper Jurassic ◽  
Ionization Mass ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Geologic Time Scale ◽  
The Law

Abstract Uranium-lead (U-Pb) geochronology studies commonly employ the law of detrital zircon: A sedimentary rock cannot be older than its youngest zircon. This premise permits maximum depositional ages (MDAs) to be applied in chronostratigraphy, but geochronologic dates are complicated by uncertainty. We conducted laser ablation–inductively coupled plasma–mass spectrometry (LA-ICP-MS) and chemical abrasion–thermal ionization mass spectrometry (CA-TIMS) of detrital zircon in forearc strata of southern Alaska (USA) to assess the accuracy of several MDA approaches. Six samples from Middle–Upper Jurassic units are generally replete with youthful zircon and underwent three rounds of analysis: (1) LA-ICP-MS of ∼115 grains, with one date per zircon; (2) LA-ICP-MS of the ∼15 youngest grains identified in round 1, acquiring two additional dates per zircon; and (3) CA-TIMS of the ∼5 youngest grains identified by LA-ICP-MS. The youngest single-grain LA-ICP-MS dates are all younger than—and rarely overlap at 2σ uncertainty with—the CA-TIMS MDAs. The youngest kernel density estimation modes are typically several million years older than the CA-TIMS MDAs. Weighted means of round 1 dates that define the youngest statistical populations yield the best coincidence with CA-TIMS MDAs. CA-TIMS dating of the youngest zircon identified by LA-ICP-MS is indispensable for critical MDA applications, eliminating laser-induced matrix effects, mitigating and evaluating Pb loss, and resolving complexities of interpreting lower-precision, normally distributed LA-ICP-MS dates. Finally, numerous CA-TIMS MDAs in this study are younger than Bathonian(?)–Callovian and Oxfordian faunal correlations suggest, highlighting the need for additional radioisotopic constraints—including CA-TIMS MDAs—for the Middle–Late Jurassic geologic time scale.

scholarly journals Supplemental Material: Recalibrating Rodinian rifting in the northwestern United States

2021 ◽  
Author(s):  
Daniel Brennan ◽  
et al.
Keyword(s):  
United States ◽  
Mass Spectrometry ◽  
Detrital Zircon ◽  
Inductively Coupled Plasma ◽  
Individual Sample ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Plasma Mass Spectrometry ◽  
Depositional Age ◽  
Conventional Laser

Individual sample detrital zircon results, alternative maximum depositional age calculations, conventional laser-ablation–inductively coupled plasma–mass spectrometry (LA-ICP-MS) methodology, rapid LA-ICP-MS methodology, sample locations, and detrital zircon U-Pb/Lu-Hf results for all analyses and compiled U-Pb data.<br>

LA-ICP-MS and MALDI-MS image registration for correlating nanomaterial biodistributions and their biochemical effects

The Analyst ◽  
2021 ◽  
Author(s):  
Laura J. Castellanos-García ◽  
Kristen N. Sikora ◽  
Jeerapat Doungchawee ◽  
Richard Vachet
Keyword(s):  
Mass Spectrometry ◽  
Inductively Coupled Plasma ◽  
Mass Spectrometry Imaging ◽  
Ionization Mass ◽  
Laser Desorption Ionization ◽  
Inductively Coupled ◽  
Biochemical Effects ◽  
Ms Imaging ◽  
Icp Ms ◽  
Plasma Mass Spectrometry

Laser ablation inductively-coupled plasma mass spectrometry (LA-ICP-MS) imaging and matrix assisted laser desorption ionization mass spectrometry imaging (MALDI-MSI) are complementary methods that measure distributions of elements and biomolecules in tissue...

Determination of major and trace elements in geological samples by laser ablation solution sampling-inductively coupled plasma mass spectrometry

2019 ◽  
Vol 34 (6) ◽  
pp. 1126-1134 ◽  
Author(s):  
Xiuhong Liao ◽  
Zhaochu Hu ◽  
Tao Luo ◽  
Wen Zhang ◽  
Yongsheng Liu ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Laser Ablation ◽  
Inductively Coupled Plasma ◽  
Matrix Effects ◽  
Major And Trace Elements ◽  
Geological Samples ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Plasma Mass Spectrometry

Water-related interferences and matrix effects in ICP-MS are dramatically reduced by using laser ablation solution sampling.

scholarly journals Evaluating the reliability of U–Pb laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) carbonate geochronology: matrix issues and a potential calcite validation reference material

Geochronology ◽  
2020 ◽  
Vol 2 (1) ◽  
pp. 155-167
Author(s):  
Marcel Guillong ◽  
Jörn-Frederik Wotzlaw ◽  
Nathan Looser ◽  
Oscar Laurent
Keyword(s):  
Mass Spectrometry ◽  
Laser Ablation ◽  
Aspect Ratio ◽  
Inductively Coupled Plasma ◽  
Matrix Effects ◽  
Ablation Crater ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Plasma Mass Spectrometry

Abstract. We document that the reliability of carbonate U–Pb dating by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) is improved by matching the aspect ratio of the LA single-hole drilling craters and propagating long-term excess variance and systematic uncertainties. We investigated the impact of different matrices and ablation crater geometries using U–Pb isotope analyses of one primary (WC-1) and two secondary reference materials (RMs). Validation RMs (VRMs) include a previously characterised one (ASH-15D) and a new candidate (JT), characterised by ID-TIMS (intercept age: 13.797±0.031 Ma) with excellent agreement to pooled LA-ICP-MS measurements (13.75±0.11 | 0.36 Ma), a U concentration of approx. 1 µg g−1 and 238U∕206Pb ratios from 5 to 460, defining the isochron well. Differences in ablation crater depth to diameter ratios (aspect ratio) introduce an offset due to downhole fractionation and/or matrix effects. This effect can be observed either when the crater size between U–Pb RM and the sample changes or when the ablation rate for the sample is different than for the RM. Observed deviations are up to 20 % of the final intercept age depending on the degree of crater geometry mismatch. The long-term excess uncertainty was calculated to be in the range of 2 % (ASH-15D) to 2.5 % (JT), and we recommend propagating this uncertainty into the uncertainty of the final results. Additionally, a systematic offset to the ID-TIMS age of 2 %–3 % was observed for ASH-15D but not for JT. This offset might be due to different ablation rates of ASH-15D compared to the primary RM or remaining matrix effects, even when the aspect ratios chosen are similar.

scholarly journals Supplemental Material: Recalibrating Rodinian rifting in the northwestern United States

2021 ◽  
Author(s):  
Daniel Brennan ◽  
et al.
Keyword(s):  
United States ◽  
Mass Spectrometry ◽  
Detrital Zircon ◽  
Inductively Coupled Plasma ◽  
Individual Sample ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Plasma Mass Spectrometry ◽  
Depositional Age ◽  
Conventional Laser

Individual sample detrital zircon results, alternative maximum depositional age calculations, conventional laser-ablation–inductively coupled plasma–mass spectrometry (LA-ICP-MS) methodology, rapid LA-ICP-MS methodology, sample locations, and detrital zircon U-Pb/Lu-Hf results for all analyses and compiled U-Pb data.<br>

Simultaneous measurement of Re–Os and S isotopic compositions of sulfur-bearing minerals using a Carius tube digestion-based N-TIMS and MC-ICP-MS approach

2018 ◽  
Vol 33 (6) ◽  
pp. 1057-1067 ◽  
Author(s):  
Shengling Sun ◽  
Jie Li ◽  
Le Zhang ◽  
Lu Yin ◽  
Jing Zhang
Keyword(s):  
Mass Spectrometry ◽  
Inductively Coupled Plasma ◽  
Thermal Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Inductively Coupled ◽  
Isotopic Compositions ◽  
Icp Ms ◽  
Plasma Mass Spectrometry ◽  
Thermal Ionization Mass

This study reports an improved procedure for the simultaneous determination of Re–Os and S isotopic compositions of sulfur-bearing minerals using negative thermal ionization mass spectrometry (N-TIMS) and multicollector-inductively coupled plasma-mass spectrometry (MC-ICP-MS), respectively.

scholarly journals Assessing the age of the Late Cretaceous Danek Bonebed with U–Pb geochronology

2014 ◽  
Vol 51 (11) ◽  
pp. 982-986 ◽  
Author(s):  
Joshua H.F.L. Davies ◽  
Jörn-Frederik Wotzlaw ◽  
Alexander P. Wolfe ◽  
Larry M. Heaman
Keyword(s):  
Mass Spectrometry ◽  
Inductively Coupled Plasma ◽  
Age Distribution ◽  
Ionization Mass ◽  
Accessory Zircon ◽  
Zircon Age ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Plasma Mass Spectrometry ◽  
Rich Material

An ash-rich volcaniclastic sandstone immediately underlying dinosaur-rich material from the Danek Bonebed in the Horseshoe Canyon Formation (HCF), Edmonton, Alberta, Canada, contains accessory zircon, which have been dated employing U–Pb geochronology. Both laser-ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) and chemical abrasion isotope dilution thermal ionization mass spectrometry (ID-TIMS) U–Pb analyses have been conducted. The zircon age distributions are complex with U–Pb dates ranging from Precambrian to Cretaceous. We consider the youngest ID-TIMS 206Pb/238U date of 71.923 ± 0.068 Ma as the maximum deposition age of the ash-rich sandstone, placing the overlying Danek bonebed in the early Maastrichtian. This age is compatible with the paleontological assemblage from the Danek Bonebed and the regional stratigraphy. The zircon age distribution also implies that the HCF had a complex provenance of the detritus with some Archean and Proterozoic zircons, a group of Mesozoic, and a large compliment of Cretaceous grains. The results highlight the importance of high precision geochronology in constraining the age of important fossil deposits such as the Danek Bonebed.

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