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A Framework for Evaluating Variation in (U-Th)/He Datasets

Sousa, Francis J. and Farley, Kenneth A. (2020) A Framework for Evaluating Variation in (U-Th)/He Datasets. Minerals, 10 (12). Art. No. 1111. ISSN 2075-163X. doi:10.3390/min10121111.

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This paper presents a framework for evaluating variation in (U-Th)/He datasets. The framework is objective, repeatable, and based on compatibility of thermal histories derived from individual (U-Th)/He dates. The structure of this new method includes three fundamental steps. First, the allowable thermal history of each individual grain is quantitatively constrained with a model. Second, the thermal histories of all grains from a sample are visualized on the same axes. Third, the compatibility of the allowable thermal histories of each individual grain is evaluated. This allows a user to assess whether variation among single grain dates can plausibly be explained (referred to here as legitimate) or not (illegitimate). Additionally, this methodology allows for accurate representation of the impact that illegitimate variation has on the thermal history constraints of a sample. We demonstrate the application of this new framework using a variety of examples from the literature, as well as with synthetic data. Modeling presented here is executed using the modeling software QTQt (version 5.6.0) and the He diffusion kinetics based on the radiation damage accumulation and annealing model, but the framework is designed to be easily adaptable to any modeling software and diffusion parameters.

Item Type:Article
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URLURL TypeDescription
Sousa, Francis J.0000-0003-1623-4023
Farley, Kenneth A.0000-0002-7846-7546
Additional Information:© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( Received: 11 November 2020 / Revised: 6 December 2020 / Accepted: 8 December 2020 / Published: 10 December 2020. (This article belongs to the Section Mineral Geochemistry and Geochronology) The Oregon State University Geomorphology Round Table is gratefully acknowledged for providing feedback on the intellectual framework of this project at an early stage. Lindsey Hedges is gratefully thanked for a lifetime of service to geochemistry. This research received no external funding. Author Contributions. Conceptualization, F.J.S. and K.A.F.; Data curation, F.J.S.; Funding acquisition, F.J.S; Investigation, F.J.S.; Methodology, F.J.S.; Writing—original draft, F.J.S; Writing—review & editing, F.J.S. and K.A.F. All authors have read and agreed to the published version of the manuscript. The authors declare no conflict of interest.
Subject Keywords:low temperature thermochronology; apatite (U-Th)/He; Bayesian MCMC thermal modeling; outliers; legitimate vs. illegitimate variation
Issue or Number:12
Record Number:CaltechAUTHORS:20201215-141037128
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Official Citation:Sousa, F.J.; Farley, K.A. A Framework for Evaluating Variation in (U-Th)/He Datasets. Minerals 2020, 10, 1111.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:107095
Deposited By: George Porter
Deposited On:16 Dec 2020 19:13
Last Modified:16 Nov 2021 18:59

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