How is strain localized in a meta-granitoid, mid-crustal basement section? Spatial distribution of deformation in the central Aar massif (Switzerland)

详细信息    查看全文

• 作者：P. Wehrens^a ; ^b ; R. Baumberger^a ; ^b ; ^{roland.baumberger@swisstopo.ch} ; A. Berger^a ; ^{alfons.berger@geo.unibe.ch} ; M. Herwegh^a ; ^{marco.herwegh@geo.unibe.ch}
• 关键词：Strain ; Localization ; Mid-crustal ; Shear zone ; Granitoid ; Alpine
• 刊名：Journal of Structural Geology
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：94
• 期：Complete
• 页码：47-67
• 全文大小：11124 K
• 卷排序：94

文摘

Mid-crustal deformation is characterized by a dense pattern of shear zones (sz) (>80 sz/km). Shear zone width and spacing depend strongly on the mica content of the plutonic host rock. Localization of deformation is controlled by pre-existing mechanical anisotropies. Strain localizes via ductile shearing and fracturing in granodiorite and granite, respectively. Multistage deformation and compositional heterogeneities result in a complex strain pattern.