K-Ar age of an andesite lava in the eastward of the Utsukushigahara Plateau, Nagano Prefecture, central Japan

DOI Web Site 1 Citations 31 References
  • MUKAI Masashi
    Department of Mountain and Environmental Science, Interdisciplinary Graduate School of Science and Technology, Shinshu University
  • KOSAKA Tomoyoshi
    Department of Geology, Faculty of Science, Shinshu University

Bibliographic Information

Other Title
  • 長野県美ヶ原高原東方から見出した安山岩溶岩のK-Ar年代
  • ナガノケン ウツクシガハラ コウゲン トウホウ カラ ミイダシタ アンザンガン ヨウガン ノ K Ar ネンダイ

Search this article

Abstract

The Miocene Uchimura Formation, which consists of the Miocene submarine volcanic rocks and the Lower Pleistocene volcanic rocks in the Chushin Highland are widely distributed in the northeastern part of the Utsukushigahara Plateau, Chushin Highland, central Japan. An andesite lava, which effused on land surface, was found out in about 3 km eastward of the Utsukushigahara Plateau. The K-Ar age for whole rock sample of the andesite lava taken from basal part of the lava flow deposits indicates 2.11±0.05 Ma in this study. According to the stratigraphical, petrographical and whole rock chemistry data, it is considered that the andesite lava belongs to the volcanic rocks in the Chushin Highland. The result is suggested that the volcanic activity in the Chushin Highland was initiated around 2.1 Ma. Consequently, it is clear that the volcanic activity in the Chushin Highland had took place both in the Upper Pliocene and Pleistocene.

Journal

Citations (1)*help

See more

References(31)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top