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 Nanoplastic Labelling with Metal Probes: Analytical Strategies for Their Sensitive Detection and Quantification by ICP Mass Spectrometry

Molecules ◽  
2021 ◽  
Vol 26 (23) ◽  
pp. 7093
Author(s):  
Lucile Marigliano ◽  
Bruno Grassl ◽  
Joanna Szpunar ◽  
Stéphanie Reynaud ◽  
Javier Jiménez-Lamana
Keyword(s):  
Mass Spectrometry ◽  
Inductively Coupled Plasma ◽  
Analytical Techniques ◽  
Inductively Coupled ◽  
Advantages And Disadvantages ◽  
Promising Tool ◽  
Icp Ms ◽  
Analytical Strategies ◽  
Icp Mass Spectrometry ◽  
Detection And Quantification

The detection and quantification of nanoplastics in aquatic environments is one of the major challenges in environmental and analytical research nowadays. The use of common analytical techniques for this purpose is not only hampered by the size of nanoplastics, but also because they are mainly made of carbon. In addition, the expected concentrations in environmental samples are below the detection limit of the majority of analytical techniques. In this context, the great detection capabilities of Inductively Coupled Plasma Mass Spectrometry (ICP-MS) in its Single Particle mode (SP-ICP-MS) have made of this technique a good candidate for the analysis of nanoplastics. Since the monitoring of carbon by ICP-MS faces several difficulties, the use of metal tags, taking advantage of the great potential of nanoplastics to adsorb chemical compounds, has been proposed as an alternative. In this perspectives paper, three different strategies for the analysis of polystyrene (PS) nanoplastics by SP-ICP-MS based on the use of metals species (ions, hydrophobic organometallic compound, and nanoparticles) as tags are presented and discussed. Advantages and disadvantages of each strategy, which rely on the labelling process, are highlighted. The metal nanoparticles labelling strategy is shown as a promising tool for the detection and quantification of nanoplastics in aqueous matrices by SP-ICP-MS.

The Giant Chalukou Porphyry Mo Deposit, Northeast China: The Product of a Short-Lived, High Flux Mineralizing Event

2021 ◽  
Author(s):  
Qingqing Zhao ◽  
Degao Zhai ◽  
Ryan Mathur ◽  
Jiajun Liu ◽  
David Selby ◽  
...  
Keyword(s):  
High Precision ◽  
Inductively Coupled Plasma ◽  
Hydrothermal Activity ◽  
Ore Deposits ◽  
Ionization Mass ◽  
Inductively Coupled ◽  
Fine Grained ◽  
Porphyry Cu ◽  
Icp Ms ◽  
Porphyry Mo Deposit

Abstract Whether giant porphyry ore deposits are the products of single, short-lived magmatic-hydrothermal events or multiple events over a prolonged interval is a topic of considerable debate. Previous studies, however, have all been devoted to porphyry Cu and Cu-Mo deposits. In this paper, we report high-precision isotope dilution-negative-thermal ionization mass spectrometric (ID-N-TIMS) molybdenite Re-Os ages for the newly discovered, world-class Chalukou porphyry Mo deposit (reserves of 2.46 Mt @ 0.087 wt % Mo) in NE China. Samples were selected based on a careful evaluation of the relative timing of the different vein types (i.e., A, B, and D veins), thereby ensuring that the suite of samples analyzed could be used to reliably determine the age and duration of mineralization. The molybdenite Re-Os geochronology reveals that hydrothermal activity at Chalukou involved two magmatic-hydrothermal events spanning an interval of 6.92 ± 0.16 m.y. The first event (153.96 ± 0.08/0.63/0.79 Ma, molybdenite ID-N-TIMS Re-Os age) was associated with the emplacement of a granite porphyry dated at 152.1 ± 2.2 Ma (zircon laser ablation-inductively coupled plasma-microscopic [LA-ICP-MS] U-Pb ages), and led to only minor Mo mineralization, accounting for <10% of the overall Mo budget. The bulk of the Mo (>90%) was deposited in less than 650 kyr, between 147.67 ± 0.10/0.60/0.76 and 147.04 ± 0.12/0.72/0.86 Ma (molybdenite ID-N-TIMS Re-Os ages), coincident with the emplacement of a fine-grained porphyry at 148.1 ± 2.6 Ma (zircon LA-ICP-MS U-Pb ages). The high-precision Re-Os age determinations presented here show, contrary to the finding of a number of studies of porphyry Cu and Cu-Mo systems, that the giant Chalukou porphyry Mo deposit primarily formed in a single, short-lived (<650 kyr) hydrothermal event, suggesting that this may also have been the case for other giant porphyry Mo deposits.

Analysis of Rare Earth Elements in Rock Samples by Inductively Coupled Plasma-Mass Spectrometry (ICP-MS)

1995 ◽  
Vol 51 (3) ◽  
pp. 312-318 ◽  
Author(s):  
M. Barbaro ◽  
B. Passariello ◽  
S. Quaresima ◽  
A. Casciello ◽  
A. Marabini
Keyword(s):  
Mass Spectrometry ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Inductively Coupled Plasma ◽  
Rock Samples ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Plasma Mass Spectrometry

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.

Accurate determination of Zn in geological and cosmochemical rock samples by isotope dilution inductively coupled plasma mass spectrometry

2015 ◽  
Vol 30 (2) ◽  
pp. 506-514 ◽  
Author(s):  
Rahat Khan ◽  
Yuta Yokozuka ◽  
Saki Terai ◽  
Naoki Shirai ◽  
Mitsuru Ebihara
Keyword(s):  
Mass Spectrometry ◽  
Isotope Dilution ◽  
Inductively Coupled Plasma ◽  
Accurate Determination ◽  
Rock Samples ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Plasma Mass Spectrometry

Inductively coupled plasma mass spectrometry (ICP-MS) procedures with isotope dilution were established for the accurate determination of trace Zn (in the level of 10−4to 10−5g g−1) in several tens of mg of geological and cosmochemical rock samples.

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