Illite-Age-Analysis (IAA) for the Dating of Shallow Faults: Prerequisites and Procedures for Improvement

Fault age determination using the illite-age-analysis (IAA) method for fault gouges has played a key role in providing absolute age information in tectonic evolution studies for the last 20 years. The accuracy and precision of the IAA method depend on (1) how to reasonably quantify the relative cont...

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Autores principales:	Yungoo Song, Ho Sim
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	illite-age-analysis (IAA) fault dating polytype quantification WILDFIRE multi-focused XRD Mineralogy QE351-399.2
Acceso en línea:	https://doaj.org/article/62311452ac0349faa66de9d862486b8b
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spelling	oai:doaj.org-article:62311452ac0349faa66de9d862486b8b2021-11-25T18:25:54ZIllite-Age-Analysis (IAA) for the Dating of Shallow Faults: Prerequisites and Procedures for Improvement10.3390/min111111622075-163Xhttps://doaj.org/article/62311452ac0349faa66de9d862486b8b2021-10-01T00:00:00Zhttps://www.mdpi.com/2075-163X/11/11/1162https://doaj.org/toc/2075-163XFault age determination using the illite-age-analysis (IAA) method for fault gouges has played a key role in providing absolute age information in tectonic evolution studies for the last 20 years. The accuracy and precision of the IAA method depend on (1) how to reasonably quantify the relative content of 1M/1M<sub>d</sub> illite generated from fault activity compared to detrital 2M<sub>1</sub> illite in the size fractions of the fault gouge, and (2) how to minimize the error factors in K-Ar or Ar-Ar dating analysis. XRD-based quantitative analysis of illite polytype has made great progress in accuracy by generating a simulated XRD pattern of 1M/1M<sub>d</sub> polytype using WILDFIRE© and full-pattern-fitting it with the XRD pattern measured from size fractions of the fault gauge. Nevertheless, the results of quantitative analysis of illite polytypes may vary depending on the sample state of the size fractions for XRD analysis, especially the preferred orientation due to the layered crystal structure of illite. In addition, the radiometric dating results may be distorted depending on the error factor of the dating method itself and on the mineral composition of the size fractions, that is, the presence of K-containing minerals such as biotite and K-feldspar other than illite. In this study, we reviewed previous studies that determined fault activity ages by applying IAA to fault gouges. From this, the prerequisites and recommendations for each of the five steps (particle size separation process, XRD analysis process, polytype quantification, radiometric dating, IAA plot) for improving the IAA method are summarized and presented. The continuous application of the improved IAA is expected to greatly contribute to the study of tectonic evolution through geological time.Yungoo SongHo SimMDPI AGarticleillite-age-analysis (IAA)fault datingpolytype quantificationWILDFIREmulti-focused XRDMineralogyQE351-399.2ENMinerals, Vol 11, Iss 1162, p 1162 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	illite-age-analysis (IAA) fault dating polytype quantification WILDFIRE multi-focused XRD Mineralogy QE351-399.2
spellingShingle	illite-age-analysis (IAA) fault dating polytype quantification WILDFIRE multi-focused XRD Mineralogy QE351-399.2 Yungoo Song Ho Sim Illite-Age-Analysis (IAA) for the Dating of Shallow Faults: Prerequisites and Procedures for Improvement
description	Fault age determination using the illite-age-analysis (IAA) method for fault gouges has played a key role in providing absolute age information in tectonic evolution studies for the last 20 years. The accuracy and precision of the IAA method depend on (1) how to reasonably quantify the relative content of 1M/1M<sub>d</sub> illite generated from fault activity compared to detrital 2M<sub>1</sub> illite in the size fractions of the fault gouge, and (2) how to minimize the error factors in K-Ar or Ar-Ar dating analysis. XRD-based quantitative analysis of illite polytype has made great progress in accuracy by generating a simulated XRD pattern of 1M/1M<sub>d</sub> polytype using WILDFIRE© and full-pattern-fitting it with the XRD pattern measured from size fractions of the fault gauge. Nevertheless, the results of quantitative analysis of illite polytypes may vary depending on the sample state of the size fractions for XRD analysis, especially the preferred orientation due to the layered crystal structure of illite. In addition, the radiometric dating results may be distorted depending on the error factor of the dating method itself and on the mineral composition of the size fractions, that is, the presence of K-containing minerals such as biotite and K-feldspar other than illite. In this study, we reviewed previous studies that determined fault activity ages by applying IAA to fault gouges. From this, the prerequisites and recommendations for each of the five steps (particle size separation process, XRD analysis process, polytype quantification, radiometric dating, IAA plot) for improving the IAA method are summarized and presented. The continuous application of the improved IAA is expected to greatly contribute to the study of tectonic evolution through geological time.
format	article
author	Yungoo Song Ho Sim
author_facet	Yungoo Song Ho Sim
author_sort	Yungoo Song
title	Illite-Age-Analysis (IAA) for the Dating of Shallow Faults: Prerequisites and Procedures for Improvement
title_short	Illite-Age-Analysis (IAA) for the Dating of Shallow Faults: Prerequisites and Procedures for Improvement
title_full	Illite-Age-Analysis (IAA) for the Dating of Shallow Faults: Prerequisites and Procedures for Improvement
title_fullStr	Illite-Age-Analysis (IAA) for the Dating of Shallow Faults: Prerequisites and Procedures for Improvement
title_full_unstemmed	Illite-Age-Analysis (IAA) for the Dating of Shallow Faults: Prerequisites and Procedures for Improvement
title_sort	illite-age-analysis (iaa) for the dating of shallow faults: prerequisites and procedures for improvement
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/62311452ac0349faa66de9d862486b8b
work_keys_str_mv	AT yungoosong illiteageanalysisiaaforthedatingofshallowfaultsprerequisitesandproceduresforimprovement AT hosim illiteageanalysisiaaforthedatingofshallowfaultsprerequisitesandproceduresforimprovement
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Illite-Age-Analysis (IAA) for the Dating of Shallow Faults: Prerequisites and Procedures for Improvement

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