A K-Ar Investigation of the Chichibu Quartz Diorite and Some Discussions on Its Cooling History.

• Saito Kazuo

  Department of Earth Sciences, Yamagata University

• Takahashi Masaki

  Geological Survey of Japan

• Onozuka Naoto

  Department of Earth Sciences, Yamagata University

Bibliographic Information

Other Title

• K Ar Investigation of the Chichibu Quar

Abstract

Thermochronological investigations have been carried out on the Chichibu Quartz Diorite in order to elucidate the detailed timing of intrusion and its cooling history. The Chichibu Quartz Diorite is a small pluton (6 × 3 km) situated in the central part of the Kanto Mountains, Japan. Newly obtained K-Ar ages from 6 biotites, ranging from 5.6 to 6.8 Ma, and from 2 hornblendes, ranging from 6.0 to 6.1 Ma, strongly suggest that the Chichibu Quartz Diorite experienced a considerably rapid cooling. Combining with previously reported paleomagnetic results, we can conclude that the body formed and subsequently cooled around Chron C3A of Cande and Kent's (1995) geomagnetic polarity time scale.

Journal

• Journal of geomagnetism and geoelectricity

  Journal of geomagnetism and geoelectricity 48 (8), 1103-1109, 1996

  Society of Geomagnetism and Earth, Planetary and Space Sciences

Keywords

• General Earth and Planetary Sciences
• General Environmental Science

Details

• CRID: 1390282681487580416
• NII Article ID: 130003559446
• NII Article ID: 10002202219
• NII Book ID: AA00698879
• DOI: 10.5636/jgg.48.1103
• ISSN: 21855765
• ISSN: 00221392
• ISSN: http://id.crossref.org/issn/00221392
• NDL BIB ID: 4079939
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4079939
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed