Ahrendt, Hans

[["dc.bibliographiccitation.firstpage","414"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","International Journal of Earth Sciences"],["dc.bibliographiccitation.lastpage","431"],["dc.bibliographiccitation.volume","93"],["dc.contributor.author","Huckriede, H."],["dc.contributor.author","Wemmer, Klaus"],["dc.contributor.author","Ahrendt, H."],["dc.date.accessioned","2018-11-07T10:48:30Z"],["dc.date.available","2018-11-07T10:48:30Z"],["dc.date.issued","2004"],["dc.description.abstract","New information on palaeogeography, orogenic evolution, tectonic structure, and boundaries of allochthonous units in the Rheno-Hercynian Belt is based on provenance analyses of clastic sediments and field studies. K-40/Ar-40 dating of detrital muscovites proved to be a particularly useful method because Cadomian, Caledonian and Early Variscan provenances of detrital material can be distinguished. Cadomian muscovite cooling ages are restricted to allochthonous units whereas Caledonian ages dominate within par-autochthonous and shortly displaced allochthonous units. The largest and uppermost preserved nappe, the Giessen-Harz Nappe, is derived from an oceanic flysch basin, which was not reached by Caledonian detritus. The other allochthonous units form a duplex-like structure sandwiched between the Giessen-Harz Nappe and par-autochthonous units at its base. The thick and heterogeneous roof- and floor-thrusts of this structure were previously often misinterpreted as olistostromes. The northern margin of allochthonous units is the steeply dipping Horre-Gommern Zone. It consists of three sub-units derived from deep-water areas between the shelf at the southern margin of the Old Red Sandstone Continent and an oceanic basin to the south. The southeastern part of the duplex-structure (Harzgerode Zone) shows close affinities to Armorican terranes."],["dc.identifier.doi","10.1007/s00531-004-0397-4"],["dc.identifier.isi","000222369300007"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/48206"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","1437-3254"],["dc.title","Palaeogeography and tectonic structure of allochthonous units in the German part of the Rheno-Hercynian Belt (Central European Variscides)"],["dc.type","review"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","641"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Zeitschrift der Deutschen Gesellschaft für Geowissenschaften"],["dc.bibliographiccitation.lastpage","650"],["dc.bibliographiccitation.volume","159"],["dc.contributor.author","Paul, Josef"],["dc.contributor.author","Wemmer, Klaus"],["dc.contributor.author","Ahrendt, Hans"],["dc.date.accessioned","2018-11-07T11:20:54Z"],["dc.date.available","2018-11-07T11:20:54Z"],["dc.date.issued","2008"],["dc.description.abstract","Isotopic cooling ages of detrital white micas arc used as markers for source ages and provenance of siliciclastic sediments in the Central European Basin. Zechstein deposits at the Southern margin of the basin were Supplied from the nearby Saxo-Thuringian Zone of the Variscan Orogen (340 Ma). Buntsandstein sediments originate from late Variscan rocks (310 Ma) of the Bohemian Massif, the Vindelician High or the French Massif Central, whereas detrital micas from the Middle Buntsandstein of the north German island of Helgoland have a Cadomian age (577 Ma). Provenance may be from Southern Poland or Czech Republic and Slovakia. Sandy Muschelkalk in southern Germany originates from the Bohemian and Vindelician Massifs. Source areas of Lower Keuper sediments and the Schilfsandstein (Stuttgart Fin.) are the Caledonides in western Norway (400 Ma). In contrast to this, the Fermoscandian Shield never delivered any material to western and southern Germany. In southern Germany, the terrigenous Keuper deposits above the Schilfsandstein consist of detritus from the Bohemian Massif (320 Ma). In northern Germany, the Upper Keuper siliciclastics are of Cadomian age (570 Ma) and are derived from Polish or Slovakian sources. Lias and Dogger detrital Muscovites in northern Germany are also of Cadomian age (555 665 Ma), whereas in southern Germany in the Lias Variscan material from the Bohemian Massif was deposited (350 Ma). Only Dogger micas yielded Cadomian ages (580 Ma)."],["dc.identifier.doi","10.1127/1860-1804/2008/0159-0641"],["dc.identifier.isi","000261786600005"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/55645"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1860-1804"],["dc.title","Provenance of siliciclastic sediments (Permian to Jurassic) in the Central European Basin"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","PII S0040-1951(01)00209-8"],["dc.bibliographiccitation.firstpage","119"],["dc.bibliographiccitation.issue","1-4"],["dc.bibliographiccitation.journal","Tectonophysics"],["dc.bibliographiccitation.lastpage","130"],["dc.bibliographiccitation.volume","345"],["dc.contributor.author","Jacobshagen, V."],["dc.contributor.author","Mueller, J."],["dc.contributor.author","Wemmer, Klaus"],["dc.contributor.author","Ahrendt, H."],["dc.contributor.author","Manutsoglu, E."],["dc.date.accessioned","2018-11-07T10:31:58Z"],["dc.date.available","2018-11-07T10:31:58Z"],["dc.date.issued","2002"],["dc.description.abstract","In southern Bolivia the very thick Ordovician siliciclastic rocks of the Cordillera Oriental show folds and a slaty cleavage of pre-Cretaceous age. These deformations had previously been attributed to either the late Ordovician Ocloyic or to the late Devonian to early Carboniferous Eohercynian (Chanic) orogenies. Now, we present K/Ar age determinations from phyllosilicates of the Ordovician slates, which have been interpreted in relation to illite crystallinity data. High anchizonal to epizonal metamorphism is indicated for most of the investigated samples. The majority of the samples have provided ages within the 320-290 Ma interval (late Carboniferous to early Permian), indicating a late Hercynian orogeny. Traces of synchronous orogenic processes are known from different parts of the Central Andes. This points to late Hercynian orogenic activities in that region. (C) 2002 Elsevier Science B.V All rights reserved."],["dc.identifier.doi","10.1016/S0040-1951(01)00209-8"],["dc.identifier.isi","000174882100007"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/44236"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.relation.issn","0040-1951"],["dc.title","Hercynian deformation and metamorphism in the Cordillera Oriental of Southern Bolivia, Central Andes"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","435"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Acta Geologica Sinica - English Edition"],["dc.bibliographiccitation.lastpage","447"],["dc.bibliographiccitation.volume","9"],["dc.contributor.author","Mengwei, Zhao"],["dc.contributor.author","Ahrendt, Hans"],["dc.contributor.author","Wemmer, Klaus"],["dc.contributor.author","Behr, Hans-Jürgen"],["dc.date.accessioned","2018-12-11T09:30:03Z"],["dc.date.available","2018-12-11T09:30:03Z"],["dc.date.issued","2009"],["dc.description.abstract","In the Ordos basin, two distinct thermal events of different ages have been identified for the first time by means of K–Ar dating combined with illite crystallinity analysis. For the Late Triassic and Late Permian samples, the K–Ar ages of the < 0.2 µm fractions (159-173 Ma) refleet an unitization age related to the Yanshanian movement and indicate a short thermal event in the Middle Jurassic; the K–Ar ages of the < 2 µm fractions (210-308 Ma) are interpreted as mixed ages of detrital material and authigenic illites. The K–Ar ages of both < 0.2 µm and < 2 µm fractions of a Middle Cambrian sample (368 Ma and 419 Ma) correspond to the ages of the metamorphism and earliest granite intrusion in the northern Caledonian Qinling fold zone (380-420 Ma) and show a thermal event during Silurian–Devonian time."],["dc.identifier.doi","10.1111/j.1755-6724.1996.mp9004009.x"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/57086"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.title","Silurian-Devonian and Jurassic Thermal Events in the Or dos Basin, China: Indications from K-Ar Dating on Illites"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]