Orthogneisses of the Spessart crystalline complex, Northwest Bavaria: Indicators of the geotectonic environment?

Okrusch, Martin; Richter, P.

doi:10.1007/bf01820631

Cited by 22 publications

(6 citation statements)

References 14 publications

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“…The generally steeply dipping association of crystalline basement units is essentially characterised by a large number of mostly synorogenic intrusives with calc-alcaline trend (OKRUSCH & RICHTER, 1986;HENES-KLAIBER, 1989;LAU et al, 1990;WILDBERG, 1990). The noncylindrical general structure with a lack of lateral continuity and a rather complex kinematic pattern in part shows barrovian metamorphism (Spessart, Ruhla, B611stein Odenwald;see OKRUSCH & RICHTER, 1986), in part high-T/low-P metamorphic conditions (BergstfiBer Odenwald;see WILLNER et al, 1991), and -below the Permo-Carboniferous Saar-Nahe basin filling (see below) -may even contain undeformed Devono-Carboniferous sedimentary rocks (HERING & ZIMMERLE, 1976;DONSIMONI, 1981).…”

Section: Geological Frameworkmentioning

confidence: 96%

“…1) lack well-dated and undeformed sediments. The deeper exposed basement largely consists of syn-to late-orogenic calc-alcaline intrusions (HENES-KLAIBER, 1989) into a previously metamorphosed volcanic and sedimentary sequence which essentially experienced high-T/low-P conditions with some slivers yielding an earlier Pdominated imprint (OKRUSCH et al, 1975;KROHE, 1991;WILLNER et al, 1991). The kinematic pattern within the steeply dipping series is largely controlled by syn-intrusive strike-slip movements which subdivide the Odenwald into a number of units with different tectonothermal evolution (KROHE, 1991).…”

Section: Geological Frameworkmentioning

confidence: 98%

“…Within this scenario, the aligned basement units of the Mid-German Crystalline Rise and of its western prolongation, the Normannian High (HOLDER & LEVERIDGE, 1986) are -in spite of complex lateral relationships -at present generally interpreted to reflect the deeply exposed basement of an active margin during Upper Devonian and Lower Carboniferous times (OKRUSCH & RICHTER, 1986;FRANKE, 1989;FRANKE & ONCKEN, 1990;KROHE, 1991;WILLNER et al, 1991;BEHRMANN et al, 1991). This can be also inferred from the juxtaposition of the Rise against the strongly deformed high-P rocks of the Phyllite zone in the southern Rhenish Massif (ANDERLE et al, 1990) -both rock associations forming a paired metamorphic belt (WILLNER et al, 1991) at a S-directed subduction zone with intervening relics of MOR-volcanics (partly preserved in nappes; FLOYD, 1984;GROSSER & DORR, 1986;MEISL, 1990).…”

Section: Introductionmentioning

confidence: 93%

“…Since the work of SCHOLTZ (1930) , 1984;HOLDER & LEVERIDGE, 1986;MATTE, 1986;OKRUSCH & RICHTER, 1986;ZIEG-LER, 1986;FRANKE, 1989;FRANKE & ONCKEN, 1990;KROHE, 1991).…”

Section: Introductionmentioning

confidence: 97%

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Contraints on the evolution of the Mid German Crystalline Rise — a study of outcrops west of the river Rhine

Flöttmann

Oncken

1992

Geol Rundsch

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ZusammenfassungEine Reihe kleinerer Aufschlfisse an der westlichen Rheingrabenrandschulter geben einen Einblick in die westliche Fortsetzung der Mitteldeutschen Kristallinschwelle. Mit der Trennung yon rhenohercynischer und saxothuringischer Zone markiert sie die Grenze von der Extern-zur Internzone des Varistischen Orogens. Die vielfaltige Gesteinsassoziation besteht aus einem Orthogneis-Amphibolit-Komplex, schwach verformten grfinschieferfaziellen Sedimenten (?Devon und Unterkarbon) mit iiberwiegend magmatischem Detritus und einer Reihe verschiedener syn-und postorogener granodioritischer bis granitischer Intrusionen; die gesamte Abfolge wird von sp~tunterkarbonen Lamprophyren durchschlagen und diskordant von permischen Sedimenten und Vulkaniten tiberlagert.Eine coaxiale Geftigeentwicklung wfihrend nahezu isothermaler Dekompression im Orthogneiskomplex deutet eine frtihe Krustendehnungsgeschichte an. Der Metamorphoseh6hepunkt in den anderen Sequenzen (amphibolit-/grtinschieferfaziell) wfihrend schwacher orogener Verformung wird von einem Blattverschiebungsregime -begleitet yon granodioritischen und basaltischen Intrusionen -unter retrograden Bedingungen abgel6st. Der temperaturbetonte Metamorphosetyp, die vorherrschende Blattverschiebungskinematik und die Erhaltung von Teilen der devonisch-karbonischen Sedimenthtille der Kristallinschwelle schliegen eine st/irkere orogene Krustenverdickung mit nachfolgender Exhumierung aus. Eine Ausnahme bildet wahrscheinlich die unmittelbare Nachbarschaft des Albersweiler Orthogneis und der Burrweiler Schiefer mit ihrer anormalen PT-Geschichte. Die orogene Entwicklung in diesere Teil der Kristallinschwelle wird anscheinend st/irker durch thermische als durch Verformungsprozesse gesteuert; dies legt eine wesentliche Rolle der prfi-bis postkinematischen Intrusionen nahe.Die wesentlichen Aspekte der korrelierten Abfolge gefiigebildender und thermischer Prozesse legtauch unter Beri~cksichtigung der lithologischen Assoziation -das geodynamische Environment eines initialen, submarinen magmatischen Bogens ffir diesen Teil der Kristallinschwelle nahe. Seine Evolution begann vermutlich w/ihrend des Oberdevons auf einer zerfallenden kontinentalen Plattform und hielt an wfihrend der unterkarbonischen Kollision mit der rhenoherzynischen Zone unter Wechsel des Deformationsmodus der Oberplatte hin zu orogenparallelem Zergleiten. AbstractSeveral small outcrops along the western Rhinegraben escarpment expose rocks which represent the western prolongation of the so-called Mid-German Crystalline Rise. This basement ridge separates the Rhenohercynian and Saxothuringian zones of the Variscan belt of Europe and thus marks the boundary between the external and the internal zones. The variable rock association includes an orthogneissamphibolite complex, weakly deformed low grade sediments (?Devonian and Visean), and a number of different syn-to post-orogenic granodioritic to granitic intrusives, all crosscut by Late Lower Car- Largely isothermal decompression during coaxial fabric evolution in the o...

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Section: Geological Frameworkmentioning

confidence: 96%

Section: Geological Frameworkmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 93%

“…Since the work of SCHOLTZ (1930) , 1984;HOLDER & LEVERIDGE, 1986;MATTE, 1986;OKRUSCH & RICHTER, 1986;ZIEG-LER, 1986;FRANKE, 1989;FRANKE & ONCKEN, 1990;KROHE, 1991).…”

Section: Introductionmentioning

confidence: 97%

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Contraints on the evolution of the Mid German Crystalline Rise — a study of outcrops west of the river Rhine

Flöttmann

Oncken

1992

Geol Rundsch

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“…The 489 ± 1 Ma (Cambrian-Ordovician boundary) Volkach syenite, revealed by drilling east of Spessart, yields the oldest age (Anthes and Reischmann 2001) and a Bulk Silicate Earth (BSE) isotopic signature (Anthes 1998); it was coeval to Rheic Ocean development. Late Silurian alkali-calcic orthogneisses of A-type affinities include the 426 ± 4 Ma Silbergrund gneiss and the 423 ± 6 Ma Erbstrom gneiss, Ruhla (Brätz 2000), the 418 ± 18 Ma Rotgneiss (Okrusch and Richter 1986) and the 410 ± 18 Ma Haibach gneiss, Spessart (Dombrowski et al 1995). Early Devonian alkali-calcic A-type orthogneisses comprise the 405 ± 3 Ma Böllstein orthogneiss, Odenwald , and the 400 ± 4 Ma Steinbach augen gneiss, Ruhla (Brätz 2000).…”

Section: The Armorican Terrane Assemblagementioning

confidence: 99%

Death of super-continents and birth of oceans heralded by discrete A-type granite igneous events: the case of the Variscan-Alpine Europe

Bonin¹

2012

J. Geosci.

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Granitoids occupy large areas of the Variscan-Alpine Europe. The specific group of A-type granites identifies postcollisional (post-orogenic) and anorogenic geodynamic settings. Post-orogenic igneous provinces are emplaced during the very last episodes of supercontinent amalgamation. Anorogenic igneous provinces accompany continental break-up and predate the development of new oceanic basins. Though not voluminous compared with the other granite types, A-type granites substantiate critical periods of the life of supercontinents. Their ages of emplacement in the Variscan-Alpine Europe span the entire Cambrian-Triassic time interval. They are not random, however, and correspond to discrete episodes. Two major age groupings, both with a c. 60 My duration, are distinguished. The Early Cambrian-Early Ordovician period corresponds to Pannotia amalgamation, followed by its break-up and the development of the Rheic-Proto-Tethys Ocean. The Late Carboniferous-Early Triassic period corresponds to Rheic closure and Pangaea amalgamation, followed by its break-up and the development of the NeoTethys Ocean. Devonian-Early Carboniferous A-type igneous episodes, scarce in Europe but widespread in Central Asia, accompanied the development of the Palaeo-Tethys Ocean.

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Structural Relationship Between Saar-Nahe Basin, Odenwald, and Spessart Mts.

Weber¹

1995

Pre-Permian Geology of Central and Eastern Europe

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Orthogneisses of the Spessart crystalline complex, Northwest Bavaria: Indicators of the geotectonic environment?

Cited by 22 publications

References 14 publications

Contraints on the evolution of the Mid German Crystalline Rise — a study of outcrops west of the river Rhine

Contraints on the evolution of the Mid German Crystalline Rise — a study of outcrops west of the river Rhine

Death of super-continents and birth of oceans heralded by discrete A-type granite igneous events: the case of the Variscan-Alpine Europe

Structural Relationship Between Saar-Nahe Basin, Odenwald, and Spessart Mts.

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