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Swiss Journal of Geosciences
Fig. 12 | Swiss Journal of Geosciences

Fig. 12

From: Mimicking Alpine thrusts by passive deformation of synsedimentary normal faults: a record of the Jurassic extension of the European margin (Mont Fort nappe, Pennine Alps)

Fig. 12

Contacts between the Evolène Series Jurassic breccias and the Mont Fort Paleozoic basement. a Overturned contact between the Evolène U. Jurassic polymict breccia and the Mont Fort Permian quartzschists [598′730/106′890]. Note the absence of mylonitic levels or abnormal rock deformation at contact. Location on Fig. 9a. b Same type of contact, observed in thin-section (cross-polarized light), [599′440/105′890]. No abnormal deformation is observed even at the grain scale. Location on Fig. 9a. c Overturned contact between the Evolène U. Jurassic polymict breccia and the Mont Fort Permian quartzschists [600′010/106′750]. Within the first 3 m from the contact, the breccia is very rich in quartzschist clasts (reconstituted basement). Location on Fig. 9b. d Evolène U. Jurassic polymict breccia showing an abundance of metabasite clasts [594′470/098′040]. The clast lithology is identical to that of the Mont Fort metabasites (Métailler Fm.) which are outcropping less than 10 m away. Location on Fig. 6

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