Appalachian orogen - Appalachian orogen

Japanese: アパラチア造山帯 - あぱらちあぞうざんたい

This refers to the orogenic belt of the Appalachian Mountains in North America. The major crustal movements that occurred here were formerly called the Appalachian Revolution, and were believed to have occurred from the Late Carboniferous to the end of the Permian period, roughly the same time as the Variscan orogeny in Europe. Recent research has shown that geosynclinal deposition in the Appalachian orogen spanned the Late Proterozoic to the Devonian periods of the Paleozoic, and that the granite that intruded into these sedimentary rocks formed four times: (1) the latest Proterozoic to Cambrian, (2) the Ordovician to Silurian, (3) the Devonian, and (4) the Pennsylvanian (Late Carboniferous), each of which was accompanied by metamorphism.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

北米大陸のアパラチア山脈一帯の造山帯をいう。ここでおこった主要な地殻変動を以前はアパラチア変革Appalachian revolutionとよび，ヨーロッパのバリスカン造山運動とほぼ同じ時期の石炭紀後期～二畳紀末におこったとされた。近年の研究では，アパラチア造山帯における地向斜堆積は原生代後期から古生代デボン紀にわたり，これらの堆積岩層に貫入した花コウ岩の形成期は(1)原生代最末期～カンブリア紀，(2)オルドビス紀～シルル紀，(3)デボン紀，(4)ペンシルベニア紀(石炭紀後期)の4回で，それぞれ変成作用を伴ったとされている。

出典　株式会社平凡社世界大百科事典第２版について　情報

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