NDLI: Age and origin of the Böllsteiner Odenwald

Content Provider	Springer Nature Link
Author	Reischmann, T. Anthes, G. Jaeckel, P. Altenberger, U.
Copyright Year	2001
Abstract	The granitoid protoliths of the gneisses of the Böllsteiner Odenwald, a part of the Mid German Crystalline Rise, intruded at 405 ± 3 Ma. This age was obtained by single zircon 207Pb/206Pb evaporation measurements. It is supported by an upper discordia intercept age of 410 ± 11 Ma from single zircon U/Pb data. These granitoids were derived from hybrid magmas according to their geochemical characteristics. Inherited zircon grains with apparent ages of 882 and 1138 Ma further constrain the source heterogeneity. The isotope data with Nd model ages for the granitoid gneisses between 1.3 and 1.7 Ga also underline the involvement of Proterozoic material into the magma sources. Since the geochemical data indicate a subduction zone environment we suggest that the Böllsteiner Odenwald was formed as part of a Silurian/Early Devonian magmatic arc in an active continental margin. The age data imply that the Böllsteiner Odenwald is closely related to the Spessart and Ruhla Crystalline Complexes but not to the Bergsträsser Odenwald. Therefore the Otzberg zone is considered to be a Variscan suture zone. Alter und Ursprung des Böllsteiner Odenwalds Die granitoiden Protolithe der Gneise des Böllsteiner Odenwaldes, eines Teils der Mitteldeutschen Kristallinschwelle, intrudierten vor 405 ± 3 Ma. Dieses Alter wurde mit Hilfe der Pb/Pb-Evaporationsmethode an Einzelzirkonen bestimmt und durch U/Pb Analysen an Einzelzirkonen untermauert, die im Concordia-Diagramm ein Oberes-Schnittpunkt-Alter von 410 ± 11 Ma ergaben. Aufgrund ihrer chemischen Zusammensetzung sind die Granitoide von hybriden Magmen abzuleiten. Die ererbten Zirkone mit Altern von 882 und 1138 Ma bestätigen die Heterogenität des Ausgangsgesteins. Die Isotopendaten mit Modellaltern von 1.3 bis 1.7 Ga unterstreichen die Beteiligung von proterozoischem Material. Da die geochemischen Daten auf eine Subduktionszone hindeuten, folgern wir, daß der Böllsteiner Odenwald als Teil eines silurisch/unterdevonischen magmatischen Bogens an einem aktiven Kontinentalrand gebildet wurde. Die Altersstellung des Böllsteiner Odenwaldes korreliert mit dem Spessart und dem Ruhla Kristallin, aber nicht mit dem Bergsträsser Odenwald. Wir interpretieren die Otzberg Zone deshalb als eine variskische Suturzone.
Starting Page	29
Ending Page	44
Page Count	16
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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