^<40>Ar-^<39>Ar Dating : Investigation of some Technical Problems and its Application to the Deccan Trap Rocks and a Unique Meteorite from Antarctica

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概要

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• In order to get more reliable ages and extend the application of ^<40>Ar-^<39>Ar dating for terrestrial and exterrestrial samples, some technical problems such as the examination of the efficiency of Cd-shielding to reduce the interference thermal neutron flux and the laser heating method were investigated. It has been reconfirmed that Cd-shielding is effective to reduce the interference ^<40>Ar produced by thermal neutron from potassium. Further the laser heating method has been successfully developed in our laboratory and give reasonable ages for some age standard and Deccan Trap samples. Application of ^<40>Ar-^<39>Ar dating method gives ages for Deccan Trap samples which range from less than 60 Ma to about 70 Ma. The clast in a unique meteorite from Antarctica gives a in ^<40>Ar-^<39>Ar age of about 490 Ma which corresponds to a degassing event and concordant with that of the host meteorite.^<40>Ar-^<39>Ar ageCd-shieldingLaser heatingDeccan TrapsMeteoriteAntarctica

• 東北大学の論文
• 1997-03-28

著者

• 岩田 尚能

  山形大学理学部地球環境学科

• 岩田 尚能

  東大・地震研

• Kaneoka Ichiro

  Earthquake Research Institute University Of Tokyo

• TAKIGAMI Yutaka

  Kanto Gakuen University

• 岩田 尚能

  山形大

• 岩田 尚能

  山形大・理

• 岩田 尚能

  Earthquake Research Institute University Of Tokyo

• Iwata Naoyoshi

  Earthquake Research Institute University Of Tokyo

• Iwata Naoyoshi

  Department Of Earth And Environmental Sciences Faculty Of Science Yamagata University

• Iwata Naoyoshi

  Faculty Of Sciences Yamagata University

• Kaneoka Ichiro

  Earthquake Research Institute The University Of Tokyo

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