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Sesia zone : ウィキペディア英語版
Sesia zone

The Sesia unit or Sesia nappe, also called the Sesia-Dent Blanche unit is a tectonic unit or terrane in the Swiss and Italian Alps. The zone crops out in the Pennine Alps and in the southeastern part of the Aosta Valley. It is widely seen as part of the Austroalpine nappes and correlated with the Dent Blanche nappe that crops out further to the northwest.
==Structural geology and lithology==
The outcrop in the southern part of the Aosta Valley is bounded to the south by the Insubric line. On the other side of this steeply dipping fault zone is the Ivrea zone, which is geologically part of the Southern Alps. The Sesia zone is (just as the correlated Dent Blanche nappe) tectonostratigraphically on top of (ophiolitic) Zermatt-Saas zone of the Penninic nappes.
The Sesia zone has a penetrative foliation because it has seen a large amount of shear during exhumation. It is therefore hard to reconstruct any older structures. It can however structurally be divided in three parts: an external, an intermediate and an internal zone. The internal zone is structurally the highest unit and is next to the Insubric line.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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