scholarly journals Towards in situ U–Pb dating of dolomite

Geochronology ◽  
2021 ◽  
Vol 3 (1) ◽  
pp. 337-349
Author(s):  
Bar Elisha ◽  
Perach Nuriel ◽  
Andrew Kylander-Clark ◽  
Ram Weinberger
Keyword(s):  
Inductively Coupled Plasma ◽  
Chemical Characterization ◽  
Early Diagenesis ◽  
Textural Features ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Plasma Mass Spectrometry ◽  
Absolute Dating ◽  
Epigenetic Processes

Abstract. Recent U–Pb dating by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) has demonstrated that reasonable precision (3 %–10 %, 2σ) can be achieved for high-resolution dating of texturally distinct calcite phases. Absolute dating of dolomite, for which biostratigraphy and traditional dating techniques are very limited, remains challenging, although it may resolve many fundamental questions related to the timing of mineral-rock formation by syngenetic, diagenesis, hydrothermal, and epigenetic processes. In this study we explore the possibility of dating dolomitic rocks via recent LA-ICP-MS dating techniques developed for calcite. The in situ U–Pb dating was tested on a range of dolomitic rocks of various origins from the Cambrian to Pliocene age – all of which are from well-constrained stratigraphic sections in Israel. We present imaging and chemical characterization techniques that provide useful information on interpreting the resulting U–Pb ages and discuss the complexity of in situ dolomite dating in terms of textural features that may affect the results. Textural examinations indicate zonation and mixing of different phases at the sub-millimeter scale (< 1 µm), and thus Tera–Wasserburg ages represent mixed dates of early diagenesis and some later epigenetic dolomitization event(s). We conclude that age mixing at the sub-millimeter scale is a major challenge in dolomite dating that needs to be further studied and note the importance of matrix-matched standards for reducing uncertainties of the dated material.

scholarly journals LA-ICP-MS U-Pb carbonate geochronology: strategies, progress, and application to fracture-fill calcite

2019 ◽  
Author(s):  
Nick M. W. Roberts ◽  
Kerstin Drost ◽  
Matthew S. A. Horstwood ◽  
Daniel J. Condon ◽  
David Chew ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Data Interpretation ◽  
Inductively Coupled ◽  
In Situ Techniques ◽  
Icp Ms ◽  
Plasma Mass Spectrometry ◽  
Absolute Dating ◽  
Dating Method ◽  
Map Data

Abstract. Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) U-Pb geochronology of carbonate minerals, calcite in particular, is rapidly gaining popularity as an absolute dating method. The technique has proven useful for dating fracture-fill calcite, which provides a powerful record of palaeohydrology, and within certain constraints, can be used to bracket the timing of brittle fracture and fault development. The high spatial resolution of LA-ICP-MS U-Pb carbonate geochronology is beneficial over traditional Isotope Dilution methods, particularly for diagenetic and hydrothermal calcite, because uranium and lead are heterogeneously distributed on the sub-mm scale. At the same time, this can provide limitations to the method, as locating zones of radiogenic lead can be time-consuming and ‘hit or miss’. Here, we present strategies for dating carbonates with in situ techniques, through imaging and petrographic techniques to data interpretation; we focus on examples of fracture-filling calcite, but most of our discussion is relevant to all carbonate applications. We demonstrate these strategies through a series of case studies. We review several limitations to the method, including open system behaviour, variable initial lead compositions, and U-daughter disequilibrium. We also discuss two approaches to data collection: traditional spot analyses guided by petrographic and elemental imaging, and image-based dating that utilises LA-ICP-MS elemental and isotopic map data.

High spatial resolution in situ U–Pb dating using laser ablation multiple ion counting inductively coupled plasma mass spectrometry (LA-MIC-ICP-MS)

2017 ◽  
Vol 32 (5) ◽  
pp. 975-986 ◽  
Author(s):  
Lie-Wen Xie ◽  
Jin-Hui Yang ◽  
Qing-Zhu Yin ◽  
Yue-Heng Yang ◽  
Jing-Bo Liu ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Inductively Coupled Plasma ◽  
High Spatial Resolution ◽  
Zircon Age ◽  
Analytical Technique ◽  
Inductively Coupled ◽  
Rapid Measurement ◽  
Icp Ms ◽  
Plasma Mass Spectrometry

A new LA-MIC-ICP-MS analytical technique has been developed for the rapid measurement of 206Pb/238U zircon age (<1%, 2s) at a high spatial resolution. We show that this technique can be routinely employed to date U–Pb in small and/or complex zircons, providing a powerful tool for geochronology.

Determination of Zr isotopic ratios in zircons using laser-ablation multiple-collector inductively coupled-plasma mass-spectrometry

2019 ◽  
Vol 34 (9) ◽  
pp. 1800-1809 ◽  
Author(s):  
Wen Zhang ◽  
Zaicong Wang ◽  
Frédéric Moynier ◽  
Edward Inglis ◽  
Shengyu Tian ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Laser Ablation ◽  
Inductively Coupled Plasma ◽  
Isotopic Ratios ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Plasma Mass Spectrometry ◽  
Isotope Variation

An in situ Zr isotopic analytical method for zircons was developed using LA-MC-ICP-MS to reveal the Zr stable isotope variation in the complex mineral crystallization history.

An improved in situ technique for the analysis of the Os isotope ratio in sulfides using laser ablation-multiple ion counter inductively coupled plasma mass spectrometry

2019 ◽  
Vol 34 (8) ◽  
pp. 1546-1552 ◽  
Author(s):  
Lü-Yun Zhu ◽  
Yong-Sheng Liu ◽  
Shao-Yong Jiang ◽  
Jie Lin
Keyword(s):  
Mass Spectrometry ◽  
Laser Ablation ◽  
Inductively Coupled Plasma ◽  
Isotope Ratio ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Plasma Mass Spectrometry ◽  
Multiple Ion Counter ◽  
Os Isotope

The 187Os/188Os ratio in low-Os sulfides could be in situ measured precisely by LA-MC-ICP-MS equipping an array of ion counters.

In situ Sr isotope measurement of small glass samples using multiple-Faraday collector inductively coupled plasma mass spectrometry with 1012Ω resistor high gain Faraday amplifiers

2015 ◽  
Vol 30 (2) ◽  
pp. 515-524 ◽  
Author(s):  
Qing Chang ◽  
Jun-Ichi Kimura ◽  
Bogdan Stefanov Vaglarov
Keyword(s):  
Inductively Coupled Plasma ◽  
High Gain ◽  
Sr Isotope ◽  
Inductively Coupled ◽  
Small Glass ◽  
Analytical Protocol ◽  
Icp Ms ◽  
Plasma Mass Spectrometry ◽  
Isotope Ratio Analysis

An analytical protocol using LA-MC-ICP-MS for precise Sr isotope ratio analysis from small glass samples is presented.

scholarly journals Significance of Baddeleyite for Paleoproterozoic PGE Deposits with Pt-Pd and Cu-Ni reefs (North-Eastern Fennoscandian Shield): New Results of U-Pb and LA-ICP-MS Studies

2020 ◽  
pp. 1-7
Author(s):  
Bayanova Т.B. ◽  
Drogobuzhskaya S.V. ◽  
Subbotin V.V. ◽  
Serov P.А. ◽  
Steshenko Е.N. ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Fennoscandian Shield ◽  
Layered Intrusions ◽  
Inductively Coupled ◽  
The North ◽  
Icp Ms ◽  
North Eastern ◽  
Plasma Mass Spectrometry ◽  
First Time

Baddeleyite is a significant mineral successfully applied in the U-Pb geochronology for the precise dating of mafic rocks from layered intrusions with the platinum group element (PGE) and Cu-Ni mineralization. The Fennoscandian Shield hosts several layered Pt-Pd, Co-Cr-Ni, and Ti-V occurrences in the Northern (Karelian) and Southern (Karelian-Finnish) belts. The aim of this study is to estimate the content and distribution of rare earth elements (REE) in baddeleyite and to calculate temperatures (Т, ̊С) of the U-Pb system closure and baddeleyite crystallization compared to zircon from Cu-Ni and Pt-Pd deposits in the north-eastern Fennoscandian Shield. For the first time, baddeleyite crystals from Cu-Ni (Monchepluton) and Pt-Pd (Monchetundra) reefs of the Monchegorsk ore area have been studied in situ by the laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) to measure the U-Pb age of formation and the REE content.

In situ sequential U–Pb age and Sm–Nd systematics measurements of natural LREE-enriched minerals using single laser ablation multi-collector inductively coupled plasma mass spectrometry

2020 ◽  
Vol 35 (3) ◽  
pp. 510-517
Author(s):  
Chao Huang ◽  
Yue-Heng Yang ◽  
Lie-Wen Xie ◽  
Shi-Tou Wu ◽  
Hao Wang ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Laser Ablation ◽  
Excimer Laser ◽  
Inductively Coupled Plasma ◽  
Single Shot ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Plasma Mass Spectrometry ◽  
193 Nm

In the present work, we describe a sequential U–Pb and Sm–Nd systematics measurement from natural LREE-enriched minerals using Neptune Plus MC-ICP-MS coupled with a 193 nm excimer laser in a single shot.

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