阿武隈高原東縁地域に産出するオーソコーツァイト礫の供給源

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The exotic orthoquartzite pebbles regarded as Precambrian age in origin, have been found from the conglomerates (Jurassic-Paleogene) in the eastern terrain of the Abukuma Plateau, suggesting the possibility of the existence of the Proterozoic (Sinian?) strata in the Abukuma Plateau. The Marumori metamorphic rocks, distributed in the northern Abukuma Plateau, are situated in the northern extention of the Yamagami and Matsugadaira metamorphic belt in Soma district. The Marumori metamorphic rocks occurr as xenolithic or roof-pendent mass in the Youngest Granite of the Abukuma Plateau and include the garnet-bearing quartzite which is inferred to have been derived from the orthoquartzitic sandstone from the its mineral composition and texture. The texture and mineral composition of the garnet-bearing quartzite well resemble the orthoquartzite pebbles occurring in the conglomerates of the Cretaceous and Paleogene. So the Marumori metamorphic rocks may belong to the provenance rock of the orthoquartzite pebbles. But the non-metamorphosed orthoquartzite pebbles contained in the Jurassic conglomerate, might have been supplied from the lost part of orthoquartzite bed correlative to the Marumori metamorphic rocks prior to the metamorphism associated with the intrusion of the Youngest Granite. On the other hand, the sedimentary petrographic analysis on shape, composition of pebble species and so on, showed that the orthoquartzite pebbles were reworked pebble. In conclusion, the existence of the remnant orthoquartzite bed is evident, but the details on the mechanics of supply remain unsolved.
日本地質学会の論文

阿武隈高原東縁地域に産出するオーソコーツァイト礫の供給源

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