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  1. 防災科研関係論文

Large Amount of Excess Argon in Hydrothermal Quartz from the Vangtat Orogenic Gold Belt, Southern Laos: New In-Sight from K-Ar and Noble Gas Isotope Analyses

https://nied-repo.bosai.go.jp/records/3852
https://nied-repo.bosai.go.jp/records/3852
1ee64fc3-e898-461e-9512-4e64e708b4a5
Item type researchmap(1)
公開日 2023-04-27
タイトル
言語 en
タイトル Large Amount of Excess Argon in Hydrothermal Quartz from the Vangtat Orogenic Gold Belt, Southern Laos: New In-Sight from K-Ar and Noble Gas Isotope Analyses
言語
言語 eng
著者 Patthana Bounliyong

× Patthana Bounliyong

en Patthana Bounliyong

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Hirochika Sumino

× Hirochika Sumino

en Hirochika Sumino

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Antonio Arribas

× Antonio Arribas

en Antonio Arribas

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抄録
内容記述タイプ Other
内容記述 K-Ar dating and 3He/4He and 40Ar/36Ar analyses were conducted on samples of hydrothermal quartz from the Thongkai-Ok Au deposit in the Vangtat orogenic Au belt of southern Laos to study the presence of excess argon in hydrothermal quartz and to better understand the origin of the ore-forming fluids. The K-Ar age of two hydrothermal quartz separates yielded apparent dates of 1040 and 1385 Ma. These ages are significantly older than the estimated age of Vangtat Au mineralization (~200 Ma) and other regional geologic events, indicating the presence of an extraordinary amount of excess argon in the hydrothermal quartz crystals. In vacuo crushing analyses of the Thongkai-Ok hydrothermal vein quartz delivered 3He/4He ≈ 0.2–0.3 R/Ra and 40Ar/36Ar ≈ 455–725, suggesting the ore-forming fluid is mainly derived from a crustal component with a minor contribution of mantle and meteoric fluids.
言語 en
書誌情報 en : Minerals

巻 12, 号 10, p. 1205-1205, 発行日 2022-09-24
出版者
言語 en
出版者 MDPI AG
ISSN
収録物識別子タイプ EISSN
収録物識別子 2075-163X
DOI
関連識別子 10.3390/min12101205
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