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In the Rhenish Massif and Ardennes, the Rheno-Hercynian fold and thrust belt of the Mid-European Variscides exposes a telescoped complete Late Palaeozoic passive margin, which was detached from the lower crust during Carboniferous collision with a continental arc Mid-German Crystalline High on the leading edge of Armorica.
Early collision was associated with offscraping of the uppermost slope sediments in frontal accretion mode. Subsequent detachment of the remaining passive margin cover was initiated after subduction of the ocean-continent transition to about 6 kbar depth. Newly failed segments of the basal detachment propagated along this isotherm and branched off towards the foreland by progressively downstepping from the passive margin sediments into the basement of the downflexed lower-plate crust.
This evolution coincided with cyclic changes in accretion mode of the lower-plate upper crust to the advancing orogenic wedge repeated changes from basal to frontal accretion as well as with a related stepwise propagation of a narrow foreland basin.
Propagation of the detachment segments and the related imbricate fans in the lower plate, moreover, was controlled by the geometry of the basin structure by localizing branch lines and ramps along earlier growth faults. Please note that if you are logged into the Lyell Collection and attempt to access content that is outside of your subscription entitlement you will be presented with a new screen. You have the option to pay to view this content if you choose. Please see the relevant links below for further assistance. Administer your subscription.
If you have any questions about the Lyell Collection publications website, please see the access help or contact sales geolsoc. We do not retain these addresses. Passive margin detachment during arc-continent collision Central European Variscides O. OnckenA. PleschJ. WeberW. Ricken and S. Next. Abstract In the Rhenish Massif and Ardennes, the Rheno-Hercynian fold and thrust belt of the Mid-European Variscides exposes a telescoped complete Late Palaeozoic passive margin, which was detached from the lower crust during Carboniferous collision with a continental arc Mid-German Crystalline High on the leading edge of Armorica.
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