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Geophysical constraints and model of the "Saxothuringian and Rhenohercynian subductions-magmatic arc system" in NE France and SW Germany

Jean-Bernard Edel and Karel Schulmann
Geophysical constraints and model of the "Saxothuringian and Rhenohercynian subductions-magmatic arc system" in NE France and SW Germany (in Mechanics of the Variscan Orogeny; a modern view on orogenic research; Part 2, Michel Faure (editor), Patrick Ledru (editor) and Voytech Janoucek (editor))
Bulletin de la Societe Geologique de France (October 2009) 180 (6): 545-558

Abstract

Correlation of geophysical and geological data with the western margin of the Bohemian massif, re-interpretation of the ECORS-DEKORP deep seismic sections, transformations and 3 D modelling of gravimetric and magnetic maps allow to define sequentional Saxothuringian and Rhenohercynian Paleozoic subduction systems in NE France and SW Germany where only 10% of the Early Paleozoic basement is outcropping. Two 35 km spaced and NE-SW trending gravity highs associated with SE dipping reflectors are interpreted as the western continuation of the Tepla Devonian paleo-subduction zone of the Saxothuringian ocean and Early Carboniferous underthrusting of the Saxothuringian passive margin, thereby defining the Saxothuringian subduction system in west Europe. South-eastwards dipping reflectors beneath the Moho are interpreted as witnesses of the Early Carboniferous subduction of the Rhenohercynian ocean. The suture is marked by the gravity high in the phyllite zone of the southern Rhenish Massif. Gravity lows in the SE of gravity highs and weak ondulating reflectors are interpreted in terms of crystalline bulges in the hangingwalls of sutures. The numerous highly magnetic anomalies correspond to magmatic bodies emplaced in the time-range 335-330 Ma, along NW dipping and sinistral normal faults. Located in the hangingwall of the Rhenohercynian subduction zone, this wide magmatic arc trends obliquely with respect to the Saxothuringian subduction system, which is almost obliterated by the wide front of magmatic bodies.


ISSN: 0037-9409
EISSN: 1777-5817
Coden: BSGFAE
Serial Title: Bulletin de la Societe Geologique de France
Serial Volume: 180
Serial Issue: 6
Title: Geophysical constraints and model of the "Saxothuringian and Rhenohercynian subductions-magmatic arc system" in NE France and SW Germany
Title: Mechanics of the Variscan Orogeny; a modern view on orogenic research; Part 2
Author(s): Edel, Jean-BernardSchulmann, Karel
Author(s): Faure, Micheleditor
Author(s): Ledru, Patrickeditor
Author(s): Janoucek, Voytecheditor
Affiliation: Ecole et Observatoire des Sciences de la Terre, Strasbourg, France
Pages: 545-558
Published: 200910
Text Language: English
Summary Language: French
Publisher: Societe Geologique de France, Paris, France
Meeting name: Special meeting of the French and Czech Geological Societies
Meeting location: Orleans, FRA, France
Meeting date: 20070913Sept. 13-15, 2007
References: 60
Accession Number: 2010-010534
Categories: Solid-earth geophysicsApplied geophysics
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., geol. sketch maps
N42°30'00" - N51°00'00", W05°00'00" - E08°30'00"
N47°15'00" - N55°00'00", E05°49'60" - E15°00'00"
N49°57'00" - N51°31'60", E06°45'00" - E09°11'60"
Country of Publication: France
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Societe Geologique de France. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201007
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