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Université de Neuchâtel

Glarus overthrust: A major pathway for the escape of fluids out of the Alpine orogen

Badertscher, Nicolas P. ; Beaudoin, Georges ; Therrien, René ; Burkhard, Martin

In: Geology, 2001, vol. 30, no. 10, p. 875-878

Thrust-related fluid flow coupled with isotopic exchange between fluid and rock is simulated in a three-dimensional finite-element model of the Glarus nappe, eastern Swiss Alps. Numerical simulations are matched against well-established oxygen isotope gradients on the kilometer scale along the thrust. At internal southern locations, strongly channelized thrust-parallel fluid flow requires a high...

Université de Neuchâtel

Near vertical iso-illite-crystallinity surfaces cross-cut the recumbent fold structure of the Morcles nappe, Swiss Alps

Burkhard, Martin ; Goy-Eggenberger, D.

In: Clay Minerals, 2001, vol. 36, p. 159-170

Metamorphic isograd surfaces are mapped within the Morcles nappe using illite crystallinity (IC) and (clay-) mineral parageneses in 268 samples. The diagenesis-anchizone and the anchizone-epizone boundaries are nearly vertical surfaces which crosscut the present-day recumbent fold nappe structure. Frontal parts of the nappe are diagenetic (Tmax <200°C) whereas rear parts both...

Université de Neuchâtel

Finite strain has no influence on the illite crystallinity of tectonized Eocene limestone breccias of the Morcles nappe, Swiss Alps

Burkhard, Martin ; Badertscher, Nicolas P.

In: Clay Minerals, 2001, vol. 36, p. 171-180

The relationship between illite crystallinity (IC) and finite strain as well as lattice strain and crystallite size of illite is examined in a series of 27 deformed breccia samples from the inverted limb of the Morcles nappe. The IC is determined independently for limestone components and a red/green clay-silt matrix. The finite strain varies widely (D = 0.8ÿ2.5). The IC values vary from...