Published July 2020 | Version v1
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Study on sample description, composition, and preparation for dating of altered volcanic rocks

Creators

  • 1. Japan Atomic Energy Agency, Sector of Nuclear Fuel, Decommissioning and Waste Management Technology Development, Tono Geoscience Center, Toki, Gifu (Japan)
  • 2. Chuo Kaihatsu Corporation, Tokyo (Japan)
  • 3. Aichi University of Education, Kariya, Aichi (Japan)
  • 4. Aichi Prefectural Atsuta High School, Nagoya. Aichi (Japan)

Description

Ages of volcanic rocks are helpful information to understand the impact of volcanism concerning a site characterization and a safety assessment for geological disposal. In this study, mineralogical and geochemical data of altered volcanic rocks were collected using a polarizing microscope, X-ray diffractometer, X-ray fluorescence spectrometer, X-ray analytical microscope, and electron probe microanalyzer, to select targets suitable for reliable K-Ar dating. In addition, sample preparation procedures such as freeze-thawing and HCl treatment were examined to concentrate unaltered plagioclase which is one of major phenocrysts in volcanic rocks. These data and procedures were compiled in this report. (author)

Availability note (English)

Also available from JAEA; DOI: https://doi.org/10.11484/jaea-research-2020-003

Abstract (Japanese)

火山岩の形成年代の情報を得ることは、地層処分のサイト特性調査や安全評価などにおいて火山活動の影響を把握する上でも重要となる。本報告書では、変質した火山岩から正確なK-Ar年代値を得るための測定対象を適切に選定するために実施した、火山岩の偏光顕微鏡記載および鉱物・化学分析の結果をデータとして取りまとめた。また、火山岩の主要な斑晶鉱物の一つである斜長石の新鮮な鉱物を高純度で集めるための、凍結融解処理や塩酸処理などの手法についても報告書に取りまとめた。(著者)

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Additional details

Additional titles

Original title (Japanese)
変質した火山岩の年代測定のための岩石記載・化学組成・前処理に関する検討

Identifiers

DOI
10.11484/jaea-research-2020-003;

Publishing Information

Imprint Pagination
42 p.
Report number
JAEA-Research--2020-003

INIS

Country of Publication
Japan
Country of Input or Organization
Japan
INIS RN
52027291
Subject category
S58: GEOSCIENCES;
Descriptors DEI
ANDESITES; CHEMICAL COMPOSITION; GEOLOGIC STRUCTURES; ISOTOPE DATING; MAGNETIC SUSCEPTIBILITY; MINERALS; UNDERGROUND DISPOSAL; VOLCANISM; X-RAY DIFFRACTION; X-RAY DIFFRACTOMETERS; X-RAY FLUORESCENCE ANALYZERS
Descriptors DEC
AGE ESTIMATION; COHERENT SCATTERING; DIFFRACTION; DIFFRACTOMETERS; IGNEOUS ROCKS; MAGNETIC PROPERTIES; MANAGEMENT; MEASURING INSTRUMENTS; PHYSICAL PROPERTIES; ROCKS; SCATTERING; VOLCANIC ROCKS; WASTE DISPOSAL; WASTE MANAGEMENT

Optional Information

Notes
15 refs., 13 figs., 10 tabs.