Penninic zone

...This is called the first stage of Alpine metamorphism. (2) Mid-Paleogene In the Penninic zone of the Western Alps, deposition of deep-sea flysch layers ended by the middle Eocene, and the formation of major folding and overthrust structures also ended before the early Oligocene. In the depths, low-pressure second stage of Alpine metamorphism progressed, and metamorphic rocks of greenschist facies and breccia facies were formed (38 million years ago), followed by the intrusion of Alpine granites (29 to 33 million years ago). ...

*Some of the terminology that refers to the "Penninic zone" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…これを第1期アルプス変成とよぶ。(2)古第三紀中ごろ　西アルプスのペンニン帯Penninic zoneでは深海成のフリッシュ層の堆積が始新世中期までに終わり，主な褶曲と押しかぶせ構造の形成も漸新世初期以前に終わった。深部では低圧型の第2期アルプス変成がすすみ，緑色片岩相，角セン岩相の変成岩が形成された(3800万年前)のち，アルプス花コウ岩類が貫入した(2900万～3300万年前)。…

※「Penninic zone」について言及している用語解説の一部を掲載しています。

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