Structure of the "diapir" of Champfromier (Jura Mountains, France

Authors
Citation
M. Meyer, Structure of the "diapir" of Champfromier (Jura Mountains, France, ECLOG GEOL, 93(2), 2000, pp. 221-229
Citations number
37
Language
FRANCESE
art.tipo
Article
Categorie Soggetti
Earth Sciences
Journal title
ECLOGAE GEOLOGICAE HELVETIAE
ISSN journal
0012-9402 → ACNP
Volume
93
Issue
2
Year of publication
2000
Pages
221 - 229
Database
ISI
SICI code
0012-9402(2000)93:2<221:SOT"OC>2.0.ZU;2-F
Abstract
Located to the SW of Geneva, the internal Jura mountains often form anticli nes which are eroded down to Middle or Upper Jurassic strata. An exceptiona l anticline core of Triassic age, previously described as a diapir, is expo sed in the western part of the Valserine valley close to the Sandezanne riv er. Detailed mapping, logging and structural analysis of Upper Triassic and Lia ssic beds have been completed in order to better understand the structure o f this area. This complex structure results from two successive thrusting e vents. The first phase caused a back-thrusting to the East whereas the seco nd resulted in thrusting to the West. These two combined tectonic phases is olated an important hidden volume that explains the topographically high po sition of the Triassic units described in the Sandezanne valley. This unusu al structure is linked to rotational movements induced by the strike-slip V uache fault.