Pinwarian to Grenvillian magmatic evolution in the central Grenville Province: new constraints from ID–TIMS U–Pb ages and coupled Lu–Hf S–MC–ICP–MS data

2015 ◽  
Vol 52 (9) ◽  
pp. 701-721 ◽  
Author(s):  
Lars Eivind Augland ◽  
Abdelali Moukhsil ◽  
Fabien Solgadi ◽  
Aphrodite Indares
Keyword(s):  
Mass Spectrometry ◽  
Inductively Coupled Plasma ◽  
Geochemical Data ◽  
Ionization Mass ◽  
Distal Margin ◽  
Magmatic Evolution ◽  
Grenville Province ◽  
Magmatic Rocks ◽  
Icp Ms ◽  
Minimum Age

Understanding the magmatic evolution of the rocks once comprising the hinterland of the Grenville Orogen through their Mesoproterozoic formation is a key to understanding the Grenvillian Orogeny as a whole. In this contribution, we present high-precision isotope dilution thermal ionization mass spectrometry (ID–TIMS) U–Pb and coupled solution multicollector inductively coupled plasma mass spectrometry (S–MC–ICP–MS) Lu–Hf zircon data from magmatic rocks occurring in the allochthonous belt of the Grenville Orogen in the central part of the Grenville Province. We document the presence of a large tract of Pinwarian crust represented by a 1497 ± 5 Ma granitic gneiss, as well as large late Geon 14 to early Geon 13 (1434 +7/−11, 1413 ± 12, 1393 ± 8, 1383 ± 1 Ma) magmatic complexes. One Grenvillian plutonic suite of 1015 ± 2 Ma that cross-cuts the host-rock metamorphic fabric has also been dated. This age provides a minimum age of Ottawan metamorphism in the region. The Hf-isotopic data show that the magmatic rocks of Geons 14 and 13 had mixed mantle and crustal sources compatible with intrusion in a supra-subduction setting as is also supported by the whole-rock geochemical data presented. Emplacement of the magmatic rocks occurred in settings varying from a distal margin arc to a contractional and extensional continental arc. Grenvillian-aged magmatism is more ambiguous, but our data indicate that rocks as young as ca. 1015 Ma may have formed in an ensialic setting.

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...

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.

Arsenosugar Metabolism Not Unique to the Sheep of North Ronaldsay

2005 ◽  
Vol 2 (3) ◽  
pp. 190 ◽  
Author(s):  
Simon J. Martin ◽  
Chris Newcombe ◽  
Andrea Raab ◽  
Jörg Feldmann
Keyword(s):  
Mass Spectrometry ◽  
Acetic Acid ◽  
Inductively Coupled Plasma ◽  
Arsenic Species ◽  
Control Group ◽  
Ionization Mass ◽  
Dimethylarsinic Acid ◽  
Trial Group ◽  
Icp Ms ◽  
Arsenic Metabolites

Environmental Context. Seaweed is enjoying a revival in farming practice, in particular by organic farmers. However, seaweed accumulates arsenic, and these arsenic compounds can enter the food chain. It is known that the arsenic is present mainly as arsenosugars, but the metabolism of these compounds by ruminants needs clarification. Abstract. Here we describe a feeding trial with Blackface sheep conducted on an organic farm in Kintyre (Scotland), which aims to prove that the metabolism of arsenic, acquired from the consumption of seaweed, is not unique to the North Ronaldsay sheep, which are adapted to a seaweed diet. Results show that the trial sheep supplemented their diet with, on average, 20 ± 9% Laminaria digitata when given the choice. The daily arsenic intake varied greatly from sheep to sheep but on average, the sheep consumed 65 μg kg−1 b.w. Total arsenic concentrations in urine, as measured by inductively coupled plasma-mass spectrometry (ICP-MS) (m/z 75) also show significant differences between the trial and control group (P < 0.0001). HPLC coupled with ICP-MS in parallel with electrospray ionization-mass spectrometry (ES-MS) for detection was used for the identification of arsenic metabolites in urine samples. Dimethylarsinic acid (DMAV) is the main metabolite in the control group as well as in the trial group. In addition, arsenic metabolites previously only found in the urine of North Ronaldsay sheep were successfully identified in the urine of the trial group of the seaweed-eating Blackface sheep: dimethylarsinoyl acetic acid (DMAA) and its thio-analogue dimethylarsinothioyl acetic acid (DMAAS) as well as the monosulfide of DMAV, DMAS. However, the poor chromatographic recovery indicates that the urine contains arsenic species, which do not elute under the conditions tested.

scholarly journals Precise Measurement of Tellurium Isotope Ratios in Terrestrial Standards Using a Multiple Collector Inductively Coupled Plasma Mass Spectrometry

Molecules ◽  
2020 ◽  
Vol 25 (8) ◽  
pp. 1956
Author(s):  
Rajamanickam Murugan ◽  
Tatsuo Aono ◽  
Sarata Kumar Sahoo
Keyword(s):  
Mass Spectrometry ◽  
Inductively Coupled Plasma ◽  
Isotope Ratio ◽  
Thermal Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Ratio Measurement ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Plasma Mass Spectrometry ◽  
Thermal Ionization Mass

Precise tellurium (Te) isotope ratio measurement using mass spectrometry is a challenging task for many decades. In this paper, Te isotope ratio measurements using multi-collector inductively coupled plasma mass spectrometry (MC–ICP–MS) in terrestrial Te standards have been reported. Newly developed Faraday cup with 1012 Ω resistor is used to measure low abundance 120Te, whereas the 1011 Ω resistor is used to measure other Te isotopes. The relative standard deviation obtained for Te isotope ratio measurement by Faraday cups of 120Te/128Te [0.002907(05)], 122Te/128Te [0.079646(10)], 123Te/128Te [0.027850(07)], 125Te/128Te [0.221988(09)], 126Te/128Te [0.592202(20)], and 130Te/128Te [1.076277(30)] were 0.140%, 0.014%, 0.026%, 0.005%, 0.004%, and 0.004%, respectively. The measured isotope ratio results are compared with previous results obtained by thermal ionization mass spectrometry (TIMS), negative thermal ionization mass spectrometry (N–TIMS), and MC–ICP–MS, showing an improvement in the precision about one order of magnitude for 120Te/128Te ratio. The present study shows better precision for Te isotope ratios compared to earlier studies.

scholarly journals Apatite U-Pb dating at UNAM laboratories: analytical protocols and examples of its application

2019 ◽  
Vol 36 (1) ◽  
pp. 27-37 ◽  
Author(s):  
Carlos Ortega-Obregón ◽  
Fanis Abdullin ◽  
Luigi Solari ◽  
Peter Schaaf ◽  
Gabriela Solís-Pichardo
Keyword(s):  
Mass Spectrometry ◽  
Inductively Coupled Plasma ◽  
Ore Deposits ◽  
Ionization Mass ◽  
Medium Temperature ◽  
Rock Samples ◽  
Inductively Coupled ◽  
Advantages And Disadvantages ◽  
Icp Ms ◽  
Analytical Protocols

Apatite is the most common phosphate mineral in the Earth’s crust and can be found in practically all magmatic and metamorphic rocks, as well as in ancient and recent sediments and in certain ore deposits. Its effective closure temperature of 450–550 °C for the U-Pb system makes apatite an important natural medium-temperature thermochronometer that can be dated by both laser ablation inductively coupled plasma mass spectrometry (LA–ICP-MS) and isotope dilution thermal ionization mass spectrometry (ID–TIMS) techniques. Due to its low U content, coupled with high Pb contents incorporated during crystallization (also called common lead), apatite U-Pb dating is analytically challenging, and requires robust analytical protocols to achieve reliable ages. In this experimental study we obtained apatite U-Pb ages from six rock samples employing LA–ICP-MS (at Laboratorio de Estudios Isotópicos, Centro de Geociencias, UNAM), while one sample was also dated by ID–TIMS (at Laboratorio Universitario de Geoquímica Isotópica, UNAM). These samples have igneous emplacement or metamorphic ages broadly ranging from the Neoproterozoic to the Paleocene. The obtained apatite U-Pb ages agree well with other radioisotopic data (U-Pb on zircon and K-Ar or Ar-Ar on micas and hornblende) available for the same rock samples tested, or for the same geological units studied. These apatite U-Pb results, obtained for the first time at two main Mexican geochronology laboratories, are precise enough to be geologically meaningful and usually represent the cooling ages; though, in some cases they may also indicate the crystallization or the metamorphic age. Some advantages and disadvantages of LA–ICP-MS- and ID–TIMS-based methodologies were observed and outlined. Our results validate the analytical procedures used and will serve as an important trigger towards the development or improvement of medium-temperature thermochronology techniques in Mexico.

scholarly journals The Role of Nanoanalytics in the Development of Organic-Inorganic Nanohybrids—Seeing Nanomaterials as They Are

Nanomaterials ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1673 ◽  
Author(s):  
Daria Semenova ◽  
Yuliya E. Silina
Keyword(s):  
Mass Spectrometry ◽  
Inductively Coupled Plasma ◽  
Secondary Ion Mass Spectrometry ◽  
Ionization Mass ◽  
Mechanical Instability ◽  
Hybrid Nanomaterials ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Application Fields

The functional properties of organic-inorganic (O-I) hybrids can be easily tuned by combining system components and parameters, making this class of novel nanomaterials a crucial element in various application fields. Unfortunately, the manufacturing of organic-inorganic nanohybrids still suffers from mechanical instability and insufficient synthesis reproducibility. The control of the composition and structure of nanosurfaces themselves is a specific analytical challenge and plays an important role in the future reproducibility of hybrid nanomaterials surface properties and response. Therefore, appropriate and sufficient analytical methodologies and technical guidance for control of their synthesis, characterization and standardization of the final product quality at the nanoscale level should be established. In this review, we summarize and compare the analytical merit of the modern analytical methods, viz. Fourier transform infrared spectroscopy (FTIR), RAMAN spectroscopy, surface plasmon resonance (SPR) and several mass spectrometry (MS)-based techniques, that is, inductively coupled plasma mass spectrometry (ICP-MS), single particle ICP-MS (sp-ICP-MS), laser ablation coupled ICP-MS (LA-ICP-MS), time-of-flight secondary ion mass spectrometry (TOF-SIMS), liquid chromatography mass spectrometry (LC-MS) utilized for characterization of O-I nanohybrids. Special attention is given to laser desorption ionization mass spectrometry (LDI-MS) as a reliable nanoanalytical platform for characterization of O-I hybrid nanomaterials, their quality, design verification and validation.

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.

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