A Comparison Study of Synkinematic Illite Isolation, Quantitative X-ray Powder Diffraction, and K-Ar Dating for Direct Fault Gouge Analyses

doi:10.1111/1755-6724.15001

首页 > 过刊浏览>2023年第97卷第2期 >636-650. DOI:10.1111/1755-6724.15001

A Comparison Study of Synkinematic Illite Isolation, Quantitative X-ray Powder Diffraction, and K-Ar Dating for Direct Fault Gouge Analyses
DOI:
                        10.1111/1755-6724.15001
                    
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                        ZHENG YongZHENG Yong

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LI HaibingLI Haibing

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LI JunjieLI Junjie

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ZHANG GuoheZHANG Guohe

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SI JialiangSI Jialiang

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ZHENG Yong
ZHENG Yong
1 Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China 2 Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China 3 Jiangsu Donghai Continental Deep Hole Crustal Activity National Observation and Research Station, Donghai, Jiangsu 222300, China
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LI Haibing
LI Haibing
1 Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China 2 Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China 3 Jiangsu Donghai Continental Deep Hole Crustal Activity National Observation and Research Station, Donghai, Jiangsu 222300, China
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LI Junjie
LI Junjie
4 Beijing Research Institute of Uranium Geology, Beijing 100029, China
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ZHANG Guohe
ZHANG Guohe
5 Military and Civilian Integration Geological Survey Center, Chengdu 610000, China
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SI Jialiang
SI Jialiang
1 Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China 2 Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China 3 Jiangsu Donghai Continental Deep Hole Crustal Activity National Observation and Research Station, Donghai, Jiangsu 222300, China
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Many thanks to anonymous reviewers for the insightful comments which improved the paper greatly. This study was funded by the National Natural Science Foundation of China (Nos. 42072240 and 41602218), Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (No. GML2019ZD0201) and the Fund from the Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources,?Chinese?Academy?of?Geological?Sciences?(Nos. J1901-30 and J1908).

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摘要:

Abstract:

K-Ar dating of synkinematic illite is increasingly recognized as a central method to constrain the timing of shallow crustal faulting. Methods of efficient sample preparation and quantitative identification of illite polytypes are critical to acquiring K-Ar isotope data for authigenic clays. In this respect, we compared the commonly used clay size separation method through centrifugation with vacuum filtration technology, showing that the former is prone to extract fractions with finer particle sizes under similar conditions, thus improving the error in the authigenic end-member age. Additionally, we demonstrated that the side-packed mounting method for X-ray diffraction analysis can significantly enhance the randomness in powder samples, thus improving the quantification accuracy compared with the front-packed and back-packed methods. The validity of our quantification method was confirmed by comparing Profex? modeling patterns with a suite of synthetic mixtures of known compositions, yielding an average analytical error of 3%. Dating results of these artificial mixtures and the reference materials indicated that a large range in percentages of detrital illite and a sufficient amount of age data will produce reliable results for ages of both extrapolated end-members. However, if the range is limited, the extrapolated age close to those of datasets is still reliable.

Key words:illite polytypes, fault gouge, clay size separation, mounting method, Profex®, extrapolated K-Ar age

引用本文

ZHENG Yong, LI Haibing, LI Junjie, ZHANG Guohe, SI Jialiang.2023. A Comparison Study of Synkinematic Illite Isolation, Quantitative X-ray Powder Diffraction, and K-Ar Dating for Direct Fault Gouge Analyses[J]. ACTA GEOLOGICA SINICA(English edition),97(2):636~650

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收稿日期:2022-04-05
最后修改日期:2022-08-08
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在线发布日期: 2023-04-24
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