A comparison between in situ monazite Lu–Hf and U–Pb geochronology

In complex metamorphic rocks, monazite U–Pb dates can span a wide concordant range, leading to ambiguous geological interpretations (e.g. slow protracted cooling versus multiphase growth). We present in situ monazite Lu–Hf analysis as an independent chronometer to verify U–Pb age interpretations. Mo...

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Published inGeochronology (Göttingen. Online) Vol. 7; no. 2; pp. 199 - 211
Main Authors De Vries Van Leeuwen, Alexander T., Glorie, Stijn, Hand, Martin, Mulder, Jacob, Gilbert, Sarah E.
Format Journal Article
LanguageEnglish
Published Göttingen Copernicus GmbH 05.06.2025
Copernicus Publications
Subjects
Ablation
Age
Geochemistry
Geochronology
Inductively coupled plasma mass spectrometry
Isotopes
Laser ablation
Lasers
Lead
Mass spectrometry
Mass spectroscopy
Measuring instruments
Metamorphic rocks
Metamorphism
Monazite
Populations
Radiometric dating
Ratios
Reference materials
Scientific imaging
Trace elements
Online AccessGet full text
ISSN2628-3719
2628-3697
2628-3719
DOI10.5194/gchron-7-199-2025

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Abstract In complex metamorphic rocks, monazite U–Pb dates can span a wide concordant range, leading to ambiguous geological interpretations (e.g. slow protracted cooling versus multiphase growth). We present in situ monazite Lu–Hf analysis as an independent chronometer to verify U–Pb age interpretations. Monazite Lu–Hf dates were attained via laser ablation inductively coupled plasma mass spectrometry equipped with collision/reaction cell technology (LA-ICP-MS/MS). In situ Lu–Hf dates for potential reference monazites with uncertainties <1.6 % agree with published U–Pb dates, validating the approach. We demonstrate the method on complex metamorphic samples from the Arkaroola region of the northern Flinders Ranges, South Australia, which exhibit protracted thermal and monazite growth histories due to high geothermal gradient metamorphism. In situ Lu–Hf dates reproduce the main U–Pb monazite age populations, demonstrating the ability to reliably resolve multiple age populations from polymetamorphic monazite samples.
AbstractList In complex metamorphic rocks, monazite U–Pb dates can span a wide concordant range, leading to ambiguous geological interpretations (e.g. slow protracted cooling versus multiphase growth). We present in situ monazite Lu–Hf analysis as an independent chronometer to verify U–Pb age interpretations. Monazite Lu–Hf dates were attained via laser ablation inductively coupled plasma mass spectrometry equipped with collision/reaction cell technology (LA-ICP-MS/MS). In situ Lu–Hf dates for potential reference monazites with uncertainties <1.6  % agree with published U–Pb dates, validating the approach. We demonstrate the method on complex metamorphic samples from the Arkaroola region of the northern Flinders Ranges, South Australia, which exhibit protracted thermal and monazite growth histories due to high geothermal gradient metamorphism. In situ Lu–Hf dates reproduce the main U–Pb monazite age populations, demonstrating the ability to reliably resolve multiple age populations from polymetamorphic monazite samples.
In complex metamorphic rocks, monazite U–Pb dates can span a wide concordant range, leading to ambiguous geological interpretations (e.g. slow protracted cooling versus multiphase growth). We present in situ monazite Lu–Hf analysis as an independent chronometer to verify U–Pb age interpretations. Monazite Lu–Hf dates were attained via laser ablation inductively coupled plasma mass spectrometry equipped with collision/reaction cell technology (LA-ICP-MS/MS). In situ Lu–Hf dates for potential reference monazites with uncertainties <1.6 % agree with published U–Pb dates, validating the approach. We demonstrate the method on complex metamorphic samples from the Arkaroola region of the northern Flinders Ranges, South Australia, which exhibit protracted thermal and monazite growth histories due to high geothermal gradient metamorphism. In situ Lu–Hf dates reproduce the main U–Pb monazite age populations, demonstrating the ability to reliably resolve multiple age populations from polymetamorphic monazite samples.
Author Gilbert, Sarah E.
Hand, Martin
De Vries Van Leeuwen, Alexander T.
Mulder, Jacob
Glorie, Stijn
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Snippet In complex metamorphic rocks, monazite U–Pb dates can span a wide concordant range, leading to ambiguous geological interpretations (e.g. slow protracted...
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SubjectTerms Ablation
Age
Geochemistry
Geochronology
Inductively coupled plasma mass spectrometry
Isotopes
Laser ablation
Lasers
Lead
Mass spectrometry
Mass spectroscopy
Measuring instruments
Metamorphic rocks
Metamorphism
Monazite
Populations
Radiometric dating
Ratios
Reference materials
Scientific imaging
Trace elements
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Title A comparison between in situ monazite Lu–Hf and U–Pb geochronology
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