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Multi-step TIMS and CA-TIMS monazite U–Pb geochronology

In such approaches, it is clear that isotopic dating targeting zircon, monazite and bastnaesite will be essential. Such dating, accompanied by appropriate structural studies should also help to better understand the geodynamic context of the alkaline magmatism, aiming to verify whether it corresponds to one or several episodes of rifting

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1994 REPORT ON ZINNWALDITE ZW‐C ANALYSED BY

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In situ Th/Pb dating of monazite in fibrous veins: Direct

Our results suggest that previously published ages on gangue and ore minerals in these deposits (e.g., muscovite, molybdenite, hydrothermal zircon) may give erroneous dates for the hydrothermal W mineralization. In situ LA-ICPMS U–Pb dating of wolframite provides a useful method for directly dating the hydrothermal W mineralization processes.

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Browse the USGS Publications Warehouse

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Geology of bastnaesite and monazite deposits in the

Alkaline-carbonate-chloride-rich fluids exsolved very early in the history of the rock, in a late stage of, or directly after, its consolidation, induced intensive high-temperature alteration of the primary mariupolite components resulted in formation of cancrinite, calcite, fluorite, …

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(PDF) Significance of apatite REE depletion and monazite

Zircon and monazite geochronology of the Hongqiyingzi

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Monazite geochronology - Wikipedia

Reconnaissance EMPA Minimum age constraints of ca 1715 and 1670 Ma are provided by monazite dating suggests metamorphism in the Nundroo Block Teasdale (1997) and Swain et al. (2005b) using SHRIMP and EMPA occurred between 1557 ± 15 Ma and 1471 ± 14 Ma (Thomas et al., dating of metamorphic monazite. 2008).

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Browse the USGS Publications Warehouse

Within a short period of one year (November 1992‐ October 1993), ninety‐two IWG‐Member laboratories have been able to characterize the chemical composition of a candidate reference sample, Zinnwaldite ZW‐C, a Li‐mica, reputed difficult to analyse because of its high contents of F and rare alkali elements and of the presence of refractory minerals.

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Direct dating of hydrothermal tungsten mineralization

U-Th-Pb dating of monazite by single-collector ICP-MS: Pitfalls and potential that the hydrothermal monazite U-Pb SHRIMP and LA-ICPMS ages ( Kempe et approach for in situ LA-ICPMS dating

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U-Pb; Lu-Hf and Sm-Nd isotopic constraints on provenance

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Pubs Warehouse Home > Browse > Article > Journal Article > Chemical Geology. Browse the USGS Publication Warehouse Publications in the Series Chemical Geology. Subseasonal variations in marine reservoir age from pre-bomb Donax obesulus and Protothaca asperrima shell …

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Journal of Petrology - academic.oup.com

Few methods exist for directly dating orogenic events in the upper crust. Here we report in-situ dates from (∼10 μm diameter) monazite grown in quartz-calcite fibrous veins, which precipitated at very low-grade metamorphic conditions (about 250 °C) in volcaniclastic and calcareous rocks of the Early Cretaceous Trancas Fm. in the Zimapán Basin, Central Mexico.

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Apatite Trace Element Compositions a Robust New Tool for

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Sebastian Zimmermann, Chris Mark, David Chew and Peter J. Voice, Maximising data and precision from detrital zircon U-Pb analysis by LA-ICPMS: The use of core-rim ages and the single-analysis concordia age, Sedimentary Geology, (2017).

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Ore Geology Reviews (v.78, #C) | www.chemweb.com

Apatite Trace Element Compositions a Robust New Tool for Mineral Exploration - Download as PDF File (.pdf), Text File (.txt) or read online. Apatites from the major types of mainly magmatic-hydrothermal mineral deposits (30 localities, mostly in British Columbia, Canada) together with apatites from carbonatites (29 intrusive complexes) and unmineralized rocks (11 localities) have been analyzed

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Zircon and monazite geochronology of the Hongqiyingzi

for the in situ U-Pb dating of zircon, monazite, titanite, xenotime and wolframite by LA-ICP-MS Reconstructing paleo-hydrologic history with LA-ICPMS U-Pb dating and trace element analyses on agates HEHE JIANG1, CIN-TY LEE1 (EMPA) and laser ablation-inductively coupled plasma mass spectrometry (LA-ICP-MS) analyses.

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Interpretation of discordant U‐Pb zircon ages: An

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Exhumation rates in the Gran Paradiso Massif (Western Alps) constrained by in situ U-Th-Pb dating of accessory phases (monazite, allanite and xenotime) NASA

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La-icpms vs. empafor monazite dating - verway-partner.com

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4 10 Schoene UThPb Geochronology - Scribd

Multi-step TIMS and CA-TIMS monazite U–Pb geochronology LA-ICPMS and SIMS methods measure Pb/U, Pb/Th and the isotopic ratios of Pb in monazite to calculate a date, whereas (Table 1; full EMPA dataset in the Data Repository). Previous U–Th–

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4 10 Schoene UThPb Geochronology - Download as PDF File (.pdf), Text File (.txt) or read online. 4 10 Schoene UThPb Geochronology SIMS UTh biostratigraphically calibrated mass extinction events and Pb dating of monazite preceded by geochemical and textural large igneous province eruptions, followed by UPb dating by SIMS or LA-ICPMS,

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Direct U-Pb dating of Cretaceous and Paleocene dinosaur

Significance of apatite REE depletion and monazite inclusions in the brecciated Se–Chahun iron oxide–apatite deposit, Bafq district, Iran: Insights from paragenesis and geochemistry