K-Ar ages of hornblendes in andesite and dacite from the Cretaceous Kanmon Group, Southwest Japan

Journal of Mineralogy, Petrology and Economic Geology Volume 88 Issue 5 Page 265-271

published_at 1993

2007010087.pdf

[fulltext] 2.94 MB

Title

K-Ar ages of hornblendes in andesite and dacite from the Cretaceous Kanmon Group, Southwest Japan

Creators Imaoka Teruyoshi

Creators Nakajima Tsukasa

Creators Itaya Tetsumaru

Creator Keywords

Kanmon Group K-Ar age Hornblende Albian Andesite Dacite

New K-Ar ages of hornblende in volcanic rocks from the type localities of the Shimonoseki Subgroup, upper half of the Kanmon Group are presented. The obtained ages are 105.2±3.3 Ma for andesite and 106.7±3.3 Ma for dacite. These data indicate igneous activity during Albian, late Early Cretaceous and support the age estimation by Shibata et al. (1978) based on stratigraphic and paleomagnetic evidences.

Subjects

地球惑星科学 ( Other)

Languages eng

Resource Type journal article

Publishers 日本岩石鉱物鉱床学会

Date Issued 1993

File Version Version of Record

Access Rights open access

Relations

[ISSN]0914-9783

Schools 大学院理工学研究科（理学）