کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4732875 1356919 2006 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
K–Ar geochronology of rhyolitic rocks in the Hohi volcanic zone, central Kyushu, Japan
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
پیش نمایش صفحه اول مقاله
K–Ar geochronology of rhyolitic rocks in the Hohi volcanic zone, central Kyushu, Japan
چکیده انگلیسی

We dated two rhyolitic lava plateaus, the Yamakogawa rhyolite and the Haneyama rhyolite, that are assumed to have erupted within a short time interval, in the middle of the Hohi Volcanic Zone, central Kyushu, Japan. The groundmass with phenocrysts removed was dated by the conventional K–Ar method using peak-height comparisons without an 38Ar spike.Our results show that the Yamakogawa rhyolite erupted more than once over a short time interval, from 1.17 to 1.22 Ma. The Haneyama rhyolite is distinctly younger, ranging from 0.67 to 0.71 Ma. The Yamakogawa rhyolite is slightly older than, and therefore probably unrelated to the Yabakei pyroclastic-flow deposit and other known widespread tephra.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Asian Earth Sciences - Volume 27, Issue 4, 1 September 2006, Pages 430–436
نویسندگان
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