NDLI: Geochemistry, tectonic setting and geodynamic significance of late orogenic dikes in the Melibocus Massif, Bergsträsser Odenwald

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Paleostress-tensor analysis of late deformation events in the Odenwald Crystalline Complex and comparison with other units of the Mid-German Crystalline Rise, Germany

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Geochemistry, tectonic setting and geodynamic significance of late orogenic dikes in the Melibocus Massif, Bergsträsser Odenwald

Content Provider	Springer Nature Link
Author	Altenberger, U. Oberhänsli, R. Stein, E. Moghni, M.
Copyright Year	2001
Abstract	The Melibocus Massif forms a tonalite pluton in the W’ Bergsträsser Odenwald, which is interpreted as part of a magmatic arc of Devonian to Carboniferous age. Dikes of various compositions intrude frequently this tonalite.Different dike-lithologies are associated with different strike directions. Most dikes show evidence of high-temperature shearing. A probable maximum paleostress direction of ca. 060° can be estimated, i.e. nearly parallel to the known Variscan subduction zone in the Northwest. Due to their ductile deformation under conditions around the Ar-closing temperature of amphibole, intrusion likely occurred during the Carboniferous (Mississippian).The gabbroic to dioritic dikes (malchites) have calc-alkaline composition. Comparison with modern analogues suggests subduction-related arc magmatism. Rare earth element distributions indicate more than 5% partial melting of the mantle source with limited amounts of residual garnet.In contrast to the tonalite pluton the granitoid dikes (alsbachites) are of S-type origin, as indicated by primary muscovite and chemical composition. This requires involvement of continental material in the dike’s source rather than in the tonalite host rock’s source. The trace element chemistry of these dikes indicates magma formation in a convergent plate tectonic situation, i.e. a magmatic arc regime. Therefore, the dikes are probably the late part of the same subduction-related magmatism, which produced the tonalitic and other plutons of the Bergsträsser Odenwald. In contrast to the large pluton-forming magmas, formation of the dikes during late or post-collisional extension or transtension followed by a phase of compression or transpression is probable. Geochemie, tektonische Stellung und geodynamische Signifikanz spätorogener Gänge im Melibocus Massiv, Bergsträsser Odenwald Der Melibokus Tonalit-Pluton gehört zum Bergsträsser Odenwald, der als Teil eines devonisch-karbonischen magmatischen Bogens interpretiert wird. In diesem Pluton treten sehr häufig magmatische Gänge unterschiedlicher Zusammensetzung auf.Die Arbeit zeigt, dass die Gänge unterschiedlicher Zusammensetzung unterschiedliche Streichrichtungen haben. Die meisten der untersuchten Gänge zeigen Hochtemperatur-Schergefüge. Aus der Lage der zerscherten Gänge lässt sich eine Paläostressrichtung mit 060° für Sigma 1 ableiten. Diese Richtung weicht nur unwesentlich von der bekannten variskischen Subduktionszone im Nordwesten ab. Aufgrund ihrer Hochtemperatur-Gefüge, die im Bereich der Schließungstemperatur von Ar in Hornblenden gebildet wurden, ist das Alter der Gänge wahrscheinlich ebenfalls als Karbon (Mississippian) einzustufen.Die gabbroiden bis dioritischen Gänge (Malchite) haben eine kalkalkaline Zusammensetzung. Der Vergleich mit rezenten Magmatiten deutet auf eine Entstehung in einem magmatischen Bogen (Kontinentalrand) hin. Die Seltenerdelementverteilung der Gänge zeigt einen wahrscheinlichen Aufschmelzungsgrad der Mantelquellregion von über 5% bei einem geringen Anteil von residualem Granat an.Im Gegensatz zu den tonalitischen Nebengesteinen zeigen die granitoiden Gänge anhand ihrer modalen (Muskovit) als auch chemischen Zusammensetzung S-Typ-Charakter. Dies bedeutet eine höhere Beteiligung krustaler Komponente in der Magmenquelle als dies für den Tonalit angenommen werden darf. Die Spurenelementchemie der granitoiden Gänge zeigt ebenfalls eine Bildung in einem konvergenten plattentektonischen Regime, d.h. innerhalb eines magmatischen Bogens. Die Gänge stellen somit vermutlich das Produkt eines späten Abschnittes des subduktionsbezogenen Magmatismus, der auch die Tonalite und andere Plutone im zentralen Bergsträsser Odenwald geschaffen hat, dar. Im Gegensatz zu dem Magmatismus der die Plutone erzeugt hat, sind die Gänge wahrscheinlich gegen Ende der Kollision oder nachfolgend auf diese in eine sich dehnende Kruste intrudiert und in einem nachfolgenden kompressiven Regime deformiert worden.
Starting Page	209
Ending Page	228
Page Count	20
File Format	PDF
ISSN	09300708
Journal	Mineralogy and Petrology
Volume Number	72
Issue Number	1-3
e-ISSN	14381168
Language	English
Publisher	Springer-Verlag
Publisher Date	2001-06-12
Publisher Place	Wien
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Geophysics Geochemistry and Petrology

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