岡山大学 地球科学研究報告
Published by Okayama University Earth Science Reports Editorial Committee

岡山県吉備高原弥高山地域に分布する中新統礫岩から変成鉄鉱石礫の発見

Suzuki, Shigeyuki Graduate School of Natural Science and Technology, Okayama University
小網, 晴男 Okayama Prefectural Okayama Asahi Senior High School
臼井, まゆみ Fujigakuin-Okayama
Abstract
The Kibi Plateau was a part of the Eurasian Continent and separated by the event of opening of Japan Sea. The rounded pebble which is considered to be continental origin was discovered. The pebble is siliceous and attracts magnets. Prepared thin-sections were observed under microscope. Selected minerals were analyzed by EPMA. The rock is composed of recrystallized quartz, magnetite, riebeckite, stilpnomelane and associated with very tiny minerals with very high relief and interference colors. The assemblage suggests that there is a possibility that the rock is a metamorphic rock of iron-formations and derived from continent.
Keywords
Continental origin
Miocene conglomerate
rounded pebble
iron-formations
Kibi Plateau
ISSN
1340-7414
NCID
AN10506284