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Geochemistry & Geophysics

Abstract:

A detailed geometric, geomorphologic and lithostratigraphic survey in the Ninglinspo area has revealed two characteristic structural features of the western margin of the Lower Paleozoic Stavelot Massif north of the Xhoris Thrust, which shows a particular juxtaposition of Devonian and Cambrian rocks. On the one hand, the Lower Devonian formations in the direct proximity of the basement show a typical, steeply W-dipping, break-thrust fold sequence. On the other hand, a subhorizontal, out-of-sequence, thrust fault, bearing Cambrian (Revinian-3/4) formations in its hanging wall, overrides the Lower Devonian formations. In a tentative model this thrust fault is identified with the Eupen Thrust, which presence is subsequently assumed along the entire western margin of the Stavelot Massif north of the Xhoris Thrust. A thin-skinned thrust sheet, the Eupen Nappe, is thus defined, predominantly composed of Cambrian (Revinian-3/4) formations and nearly covering the entire northern part of the Stavelot Massif in the footwall of the Xhoris Thrust.