Combined Zircon/Apatite U-Pb and Fission-Track Dating by LA-ICP-MS and Its Geological Applications: An Example from the Egyptian Younger Granites

Minerals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1341
Author(s):  
Sherif Mansour ◽  
Noriko Hasebe ◽  
Ehab Azab ◽  
Ashraf Y. Elnaggar ◽  
Akihiro Tamura
Keyword(s):  
Inductively Coupled Plasma ◽  
Fission Track ◽  
Eastern Desert ◽  
Slow Cooling ◽  
Tectonic Event ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Short Period ◽  
Analytical Time ◽  
Erosional Event

Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry (LA-ICP-MS) is classically used in U-Pb dating to measure U and Pb isotopic concentrations. Recently, it has become frequently used in fission-track (FT) chronometry too. As an advantage, the U-Pb and FT double dating will enable efficiently determining the crystallization ages and the thermo-tectonic history concurrently as samples volume, analytical time, efforts, and cost will be greatly reduced. To demonstrate the validity of this approach, a Younger granite (Ediacaran age) sample from North Eastern Desert (NED), Egypt was analyzed for U-Pb and FT double dating. The integration of multiple geochronologic data yielded a zircon U-Pb crystallization age of 599 ± 30 Ma, after emplacement, the rock cooled /uplifted rapidly to depths of 9–14 km as response to the post-Pan African Orogeny erosional event as indicated by apatite U-Pb age of 474 ± 9 Ma. Afterwards, the area experienced a slow cooling/exhumation for a short period, most-likely as response to denudation effect. During the Devonian, the area was rapidly exhumed to reach depths of 1.5–3 km as response to the Hercynian tectonic event, as indicated by a zircon FT age of 347 ± 16 Ma. Then the studied sample has experienced a relatively long period of thermal stability between the Carboniferous and the Eocene. During the Oligocene-Miocene, the Gulf of Suez opening event affected the area by crustal uplift to its current elevation. This integration of Orogenic and thermo-tectonic information reveals the validity, efficiency, and importance of double dating of U-Pb and FT techniques using LA-ICP-MS methodology.

scholarly journals Technical note: on LA–ICP-MS U–Pb dating of unetched and etched apatites

2020 ◽  
Author(s):  
Fanis Abdullin ◽  
Luigi Solari ◽  
Jesús Solé ◽  
Carlos Ortega-Obregón
Keyword(s):  
Mass Spectrometry ◽  
Laser Ablation ◽  
Inductively Coupled Plasma ◽  
Fission Track ◽  
Technical Note ◽  
Apatite Fission Track ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Plasma Mass Spectrometry ◽  
Spectrometry Technique

Abstract. The same unetched and chemically etched apatites from five rock samples were dated with U–Pb using laser ablation inductively coupled plasma mass spectrometry. The objective of this study is to demonstrate whether or not the etching, needed for the apatite fission track analysis, impact on the obtaining of apatite U–Pb ages. The results of this experiment indicate that the etching has no effect on the determination of apatite U–Pb ages by the laser ablation inductively coupled plasma mass spectrometry technique. Thus, laser ablation inductively coupled plasma mass spectrometry may be used safely for simultaneous apatite fission track in-situ and U–Pb double dating.

LA-ICP-MS analysis of crystallized melt inclusions in olivine, plagioclase, apatite and pyroxene: quantification strategies and effects of post-entrapment modifications

2020 ◽  
Author(s):  
Jia Chang ◽  
Andreas Audétat
Keyword(s):  
Inductively Coupled Plasma ◽  
Melt Inclusions ◽  
Melt Inclusion ◽  
Volcanic Rocks ◽  
Internal Standard ◽  
Spot Size ◽  
Slow Cooling ◽  
Inductively Coupled ◽  
Ms Analysis ◽  
Icp Ms

Abstract Melt inclusions represent a unique tool to reconstruct the composition and chemical evolution of silicate melts in magmatic systems. Laser-ablation inductively-coupled-plasma mass-spectrometry (LA-ICP-MS) is the most commonly used microanalytical technique to analyze crystallized melt inclusions without prior re-homogenization. Well-preserved melt inclusions can be quantified by subtracting the contribution of co-ablated host with a carefully selected internal standard. However, post-entrapment compositional re-equilibration commonly renders this task difficult, to the same degree as it would affect any quantification after prior re-homogenization. In this study, we first examine well-preserved, crystallized melt inclusions hosted in olivine, plagioclase, apatite, clinopyroxene and orthopyroxene from porphyry dikes and volcanic rocks to test various quantification strategies and evaluate the associated uncertainties, and then we use these strategies to quantify coarsely crystallized melt inclusions from gabbroic rocks at Marble Canyon (USA) and Laiyuan (China) that experienced severe post-entrapment modifications due to relatively slow cooling rates. The results demonstrate that even for well-preserved melt inclusions hosted in chemically complex minerals the uncertainty related to inclusion–host deconvolution can be rather high (up to 30‒50% for host-incompatible trace elements significantly above their limits of detection), though other uncertainties inherent to LA-ICP-MS analysis are relatively small (typically ≤5‒10%). The deconvolution-related uncertainty can be minimized to ca. 10% by (i) choosing whole rocks that are fresh and representative of magmatic liquids, (ii) choosing the smallest possible spot size to ablate the melt inclusions, and (iii) choosing a host endmember that is compositionally as similar as possible to the one ablated together with the inclusion. Results of coarsely crystallized melt inclusions from gabbroic rocks suggest that the range of elements affected by post-entrapment re-equilibration varies from intrusion to intrusion. Olivine-hosted melt inclusions from Marble Canyon appear to have diffusively lost Fe, Ti and Ca, whereas those from Laiyuan lost Fe, Na, Al, Ca, Ti and Y and gained V. However, the relative abundances of K, P, Rb, Sr, Zr, Nb, Mo, Cs, Ba, Ce, Ta, Pb, Th, U and ±Cu appear unchanged. Plagioclase-hosted melt inclusions from Marble Canyon are relatively well-preserved, whereas those from Laiyuan lost significant amounts of Fe, K, Mg, Mn, Rb and Co. Apatite-hosted melt inclusions seem well preserved with regard to most elements except for Cu. These results suggest that despite the post-entrapment modification of certain element concentrations and the associated difficulties in melt inclusion quantification, information on the approximate abundances of other elements that are invaluable for petrogenetic and metallogenic studies can still be retrieved from melt inclusions in gabbroic rocks using the LA-ICP-MS technique.

Results report of apatite fission-track analysis by LA-ICP-MS and its comparison with the conventional external detector method dating

2022 ◽  
Author(s):  
Cristina Noemi Guibaldo ◽  
Sofia Bordese ◽  
Mario Ignacio Simoy
Keyword(s):  
Mass Spectrometry ◽  
Laser Ablation ◽  
Inductively Coupled Plasma ◽  
Fission Track ◽  
Apatite Fission Track ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Detector Method ◽  
Plasma Mass Spectrometry ◽  
Track Analysis

This work presents the apatite fission track (AFT) age and multielement analysis of four samples performed by laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS). The central ages calculated range between 15.4...

scholarly journals Technical note: LA–ICP-MS U–Pb dating of unetched and etched apatites

Geochronology ◽  
2021 ◽  
Vol 3 (1) ◽  
pp. 59-65
Author(s):  
Fanis Abdullin ◽  
Luigi A. Solari ◽  
Jesús Solé ◽  
Carlos Ortega-Obregón
Keyword(s):  
Inductively Coupled Plasma ◽  
Chemical Etching ◽  
Fission Track ◽  
Technical Note ◽  
Apatite Fission Track ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Plasma Mass Spectrometry ◽  
Precision And Accuracy ◽  
Track Analysis

Abstract. The same unetched and chemically etched apatite crystals from five rock samples were dated by the U–Pb method via laser ablation inductively coupled plasma mass spectrometry (LA–ICP-MS). The objective of this study is to test whether chemical etching required for apatite fission track analysis impacts the precision and accuracy of apatite U–Pb geochronology. The results of this experiment suggest that etching has insignificant effects on the accuracy of apatite U–Pb ages obtained by LA–ICP-MS. Therefore, LA–ICP-MS is reliable for U–Pb analysis as part of apatite fission track and U–Pb double dating.

scholarly journals Using zircon geochronology to resolve the Archaean geology of southern West Greenland

2006 ◽  
Vol 10 ◽  
pp. 49-52 ◽  
Author(s):  
Julie A. Hollis ◽  
Dirk Frei ◽  
Jeroen A.M. Van Gool ◽  
Adam A. Garde ◽  
Mac Persson
Keyword(s):  
Laser Ablation ◽  
Mass Spectrometer ◽  
Inductively Coupled Plasma ◽  
Geological Mapping ◽  
Zircon Geochronology ◽  
West Greenland ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Geological Evolution ◽  
Analytical Time

Until recently, in situ U-Pb zircon geochronology could be carried out only using ion microprobes, requiring lengthy analysis times of c. 20 minutes. However, new developments in laser ablation inductively coupled plasma mass spectrometer technologies have resulted in zircon geochronology techniques that are much faster, simpler, cheaper, and more precise than before (e.g. Frei et al. 2006, this volume). Analyses approaching the precision obtained via ion microprobe can now be undertaken in 2–4 minutes using instruments such as the 213 nm laser ablation (LA) system coupled with Element2 sector-field inductively coupled plasma mass spectrometer (SF-ICP-MS) housed at the Geological Survey of Denmark and Greenland (GEUS). The up to tenfold decrease in analytical time means that zircon geochronology can now be used in a much wider range of studies. The Godthåbsfjord region, southern West Greenland, contains some of the oldest rocks exposed on the Earth’s surface reflecting a very complex Archaean geological evolution (Figs 1, 2). Over recent years GEUS has undertaken a range of mapping projects at various scales within the Godthåbsfjord region (see also below). These include the mapping of the 1:100 000 scale Kapisillit geological map sheet (Fig. 1), and regional and local investigations of the environments of formation and geological evolution of supracrustal belts, hosting potentially economic mineral occurrences. Zircon geochronology is an important tool for investigating a range of geological problems in this region. By breaking down the complex geology into a series of simple problems that can be addressed using this tool, the geological evolution can be unlocked in a stepwise manner. Three examples are presented below: (1) the mapping of regional structures; (2) characterising and correlating supracrustal belts; and (3) dating metamorphism and mineralisation. Although focus is on the application of zircon geochronology to these problems, it is important to note that the resulting data must always be viewed within a wider context incorporating geological mapping and structural, geochemical and petrographic investigations.

Single Particle Inductively Coupled Plasma Mass Spectrometry: Investigating Nonlinear Response Observed in Pulse Counting Mode and Extending the Linear Dynamic Range by Compensating for Dead Time Related Count Losses on a Microsecond Timescale

2019 ◽  
Author(s):  
Ingo Strenge ◽  
Carsten Engelhard
Keyword(s):  
Mass Spectrometry ◽  
Inductively Coupled Plasma ◽  
Nonlinear Response ◽  
Dynamic Range ◽  
Dead Time ◽  
Inorganic Nanoparticles ◽  
Linear Dynamic Range ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Plasma Mass Spectrometry

<p>The article demonstrates the importance of using a suitable approach to compensate for dead time relate count losses (a certain measurement artefact) whenever short, but potentially strong transient signals are to be analysed using inductively coupled plasma mass spectrometry (ICP-MS). Findings strongly support the theory that inadequate time resolution, and therefore insufficient compensation for these count losses, is one of the main reasons for size underestimation observed when analysing inorganic nanoparticles using ICP-MS, a topic still controversially discussed.</p>

Fast Turn-around Failure Analysis of Metal Interconnection Using FIB and LA ICP-MS

2010 ◽  
Author(s):  
Zixiao Pan ◽  
Wei Wei ◽  
Fuhe Li
Keyword(s):  
Failure Analysis ◽  
Inductively Coupled Plasma ◽  
Structural Damage ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Detection Sensitivity ◽  
Chemical Contamination ◽  
Inductively Coupled ◽  
Minimal Sample ◽  
Icp Ms

Abstract This paper introduces our effort in failure analysis of a 200 nm thick metal interconnection on a glass substrate and covered with a passivation layer. Structural damage in localized areas of the metal interconnections was observed with the aid of focused ion beam (FIB) cross-sectioning. Laser ablation inductively coupled plasma mass spectroscopy (LA ICP-MS) was then applied to the problematic areas on the interconnection for chemical survey. LA ICP-MS showed direct evidence of localized chemical contamination, which has likely led to corrosion (or over-etching) of the metal interconnection and the assembly failure. Due to the high detection sensitivity of LA ICP-MS and its compatibility with insulating material analysis, minimal sample preparation is required. As a result, the combination of FIB and LA ICP-MS enabled successful meso-scale failure analysis with fast turnaround and reasonable cost.

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