Wolfgang Franke

Wolfgang Franke
Goethe-Universität Frankfurt am Main · Inst. für Geowissenschaften

Dr.

About

111
Publications
14,315
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6,648
Citations
Citations since 2016
10 Research Items
1945 Citations
2016201720182019202020212022050100150200250300350
2016201720182019202020212022050100150200250300350
2016201720182019202020212022050100150200250300350
2016201720182019202020212022050100150200250300350
Additional affiliations
January 2005 - October 2011
Goethe-Universität Frankfurt am Main
Position
  • full professor of geology

Publications

Publications (111)
Article
Beranoaguirre et al. (Int J Earth Sci 108:2037–2046, 2019) have added a valuable piece of information to the Carboniferous tectono-thermal record of Europe by documenting a short-term pulse of heating in high-pressure metamorphic rocks of the NW-Iberian allochthons (c. 350 Ma, Malpica–Tui unit). They correctly state that the short duration of the t...
Chapter
The Variscan (often termed Hercynian) orogeny spans most of central and south-eastern Europe from South Portugal to Poland and beyond into the Balkans and Turkey. It is a collage of microcontinents which drifted off from the northern margin of Gondwana and includes Avalonia and the Armorican Terranes Assemblage (ATA). Break-up started by southward...
Article
Analysis of the distribution of detrital zircon grains is one of the few parameters by which Precambrian palaeogeography may be interpreted. However, the break-up of Pangea and the subsequent dispersal of some of its fragments around the Indian Ocean demonstrate that zircon analysis alone may be misleading, since zircons indicate their original der...
Article
Full-text available
Our paper reports the detrital zircon record from Late Devonian to late Carboniferous foreland basin deposits in the Rheno-Hercynian (RH) Variscides of Germany. Together with a review of petrography and detrital mineral ages from the literature, the data permit to reconstruct accretion and exhumation along the RH active margin. From Frasnian to lat...
Article
Full-text available
Geological evidence, supported by biogeographical data and in accord with palaeomagnetic constraints, indicates that “one ocean” models for the Variscides should be discarded, and confirms, instead, the existence of three Gondwana-derived microcontinents which were involved in the Variscan collision: Avalonia, North Armorica (Franconia and Thuringi...
Article
Sedimentary petrography and zircon ICP-MS laser ablation ages from synorogenic clastic sediments in the Rheno-Hercynian Belt of Germany (Rheinisches Schiefergebirge, Harz) reveal basal tectonic accretion followed by exhumation and recycling of Baltica-derived Devonian shelf sediments. The recycled sediment volume demands a substantial palinspastic...
Article
The Variscan orogenic collage consists of three subduction-collision systems (Rheno-Hercynian, Saxo-Thuringian and Massif Central-Moldanubian). Devonian to early Carboniferous marine strata are widespread not only in the individual foreland fold and thrust belts, but also in post-tectonic basins within these foreland belts and on the Cadomian crust...
Article
In the Lausitz–Izera Massif of the Saxothuringian terrane, part of the central European Variscides, 515–480Ma metagranites have been intruded by a swarm of basic veins that have within-plate alkali basalt geochemistry, or, rarely, normal mid-ocean ridge basalt (N-MORB) geochemistry. Based on their spatial orientation, distribution in the region and...
Article
The present comment disproves the tectonic model of a late Devonian/early Carboniferous Tibetan-style collisional plateau in the Teplá-Barrandean (TB) part of the Bohemian Massif, which later collapsed by thermal weakening of the underlying crust. Contrary to this model, the TB neither reveals major crustal thickening nor uplift and erosion, and ea...
Article
The Hörre Belt in the SE part of the Rhenish Massif has been regarded as autochthonous because of the apparent lack of metamorphic inversion. We have performed a K-white mica study using powder X-ray diffraction derived Kübler Index (KI) and K-white mica b cell dimension, and the spectrally derived wavelength of the 2,200 nm absorption feature (“22...
Article
The Montagne Noire forms the southernmost part of the French Massif Central. Carboniferous flysch sediments and very low-grade metamorphic imprint testify to a very external position in the orogen. Sedimentation of synorogenic clastic sediments continued up to the Viséan/Namurian boundary (≤320Ma). Subsequently, the Palaeozoic sedimentary pile unde...
Article
This paper summarizes results acquired in the German segment of the Rheno-Hercynian Belt during the past 20 years, comparisons with England, and important open questions. Newly discovered allochthonous units underlying the ocean-derived Giessen Nappe can be attributed to the strongly extended, passive northern margin of the Rheno-Hercynian Ocean. T...
Article
Full-text available
The Odra Fault Zone of southwestern Poland is a NW-trending horst marked by gravimetric and magnetic anomalies and composed of high- to low-grade metamorphic and igneous rocks which are only known from boreholes. This zone embraces a concealed border between Variscan internides and externides. It also contains an array of several I-type, metalumino...
Article
On the basis of a brief survey of the subdivision and evolution of the Variscides, this paper addresses controversial issues relating to the plate kinematic assembly and the 'collapse' of the orogen. A widespread phase of Devonian extension and basaltic magmatism is at variance with overall convergence. This episode either reflects subduction of th...
Article
Full-text available
We report U–Pb single zircon ages from three pre-Variscan granitoids in the NE part of the Bohemian Massif. The Platerwka granodiorite from the Lausitz-Izera Unit, the Polish Sudetes, has been dated at 5339Ma. The Bitouchov granite form the SW part of the South Krkonoe Unit, the Czech Sudetes, gave an age of 540+11/–10Ma, and the Wdroe granodiorite...
Article
The Montagne Noire at the southern margin of the French Massif Central represents an exceptional case of a hot metamorphic core complex evolved from a thrust stack in a foreland position. The core of the structure (Zone Axiale) exposes granites and LP/HT gneisses up to anatectic grade. The hot core is encased by ENE-trending shear zones, which defi...
Article
Full-text available
The Teplá – Barrandian unit (TBU) of the Bohemian Massif shared a common geological history throughout the Neoproterozoic and Cambrian with the Avalonian – Cadomian terranes. The Neoproterozoic evolution of an active plate margin in the Teplá – Barrandian is similar to Avalonian rocks in Newfoundland, whereas the Cambrian transtension and related c...
Article
Early Palaeozoic bimodal rift-related magmatism is widespread throughout much of the Variscides of Europe. It is traceable from the Polish Sudetes to NW Iberia. Granitic plutonism generally predates Cambro–Ordovician bimodal magmatism. In the N Bohemian Massif this early Palaeozoic granitic plutonism was generated by partial melting of Cadomian bas...
Article
Full-text available
The Montagne Noire is a metamorphic core complex situated in the southern foreland of the Variscan belt in South France. The core of the structure (Zone Axiale) exposes LP/HT gneisses metamorphosed in Carboniferous time. Exhumation of the hot gneisses has imposed amphibolite facies to low-grade metamorphism on the Palaeozoic rocks in the mantle of...
Article
Tectonic zones and palaeogeographic units (terranes) in the German segment of the Variscides correlate with equivalents in the Sudetes at the NE margin of the Bohemian Massif. This correlation defines an arcuate structure with an opening angle of about 90°. The structure is truncated to the SE by a crustal scale, NE-trending fault zone with dextral...
Article
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In central Europe, three crustal units, i.e. the Małopolska, the Łysogóry and the Bruno-Silesia, can be recognized by basement data, faunas and provenance of clastic material in the Cambrian clastic rocks. They are now situated within the Trans-European Suture Zone, a tectonic collage of continental terranes bordering the Tornquist margin of the pa...
Article
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Multidisciplinary studies of geotransects across the North European Plain and Southern North Sea, and geological reexamination of the Variscides of the North Bohemian Massif, permit a new 3-D reassessment of the relationships between the principal crustal blocks abutting Baltica along the Trans-European Suture Zone (TESZ). Accretion was in three st...
Article
The Early Carboniferous fluvial and deltaic sequence of the Intra-Sudetic Basin remained undated until recently, except for a Late Viséan ammonoid fauna in its upper part. Current miospore data indicate that the oldest part of the sequence is not older than the mid Viséan Knoxisporites triradiatus-Knoxisporites stephanephorus biozone of the west Eu...
Article
Full-text available
A provenance study of detrital zircon has been carried out in Middle Cambrian sandstones from the Lysogory Unit (Holy Cross Mountains) and the East European Platform (EEP, Baltica) to investigate the docking of terranes along the Trans-European Suture Zone (TESZ) during the Paleozoic. Paleontological evidence suggests that the Lysogory Massif is a...
Book
Full-text available
Research into the orogenic processes that shaped the continental crust of Europe has a long-standing tradition. Why the need to quantify and model? It is not just satisfactory to identify ancient examples of subduction zones, accretionary prisms, island arcs, extensional collapse and other standard items of the geodynamic menu. Such interpretations...
Article
Analysis of tectonostratigraphic units in the West Sudetes reveals the same geological events as in the areas west of the Elbe Fault Zone: a late Proterozoic (Cadomian) orogenic event, Cambro-Ordovician to Devonian rift-drift, and late Devonian to early Carboniferous subduction-collision. There is no conclusive evidence of an Ordovician orogenic ev...
Article
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The Lysogory Unit, the Malopolska Massif and the Upper Silesian Massif in southern Poland are parts of a mosaic of contrasting crustal fragments separating the old Precambrian crust of the East European Platform (EEP) from the Phanerozoic mobile belts of western Europe. The geological histories of these blocks are markedly different. They have been...
Article
The Saxo-Thuringian Belt on the northern flank of the European Variscides resulted from SE-ward subduction of a Cambro-Ordovician rift basin under the Teplá-Barrandian (Bohemian) margin. It contains ultra-high-pressure (UHP) metamorphic rocks, which are now exposed in different tectonic settings, and were exhumed in different modes, under different...
Article
The mid-European segment of the Variscides is a tectonic collage consisting of (from north to south): Avalonia, a Silurian-early Devonian magmatic arc, members of the Armorican Terrane Assemblage (ATA: Franconia, Saxo-Thuringia, Bohemia) and Moldanubia (another member of the ATA or part of N Gondwana?). The evolution on the northern flank of the Va...
Article
The Saxonian Granulites represent a major exposure of high-pressure rocks within the mid-European Variscan belt. The granulites emerge in an extensional dome structure beneath a low-grade Paleozoic cover. The boundary between the granulites and their cover is a crustal-scale shear zone with transport top to the SE, juxtaposing high-pressure (HP) gr...
Article
This study combines experimental work and numerical simulations to reconstruct the thermal history of the Frankenwald Transverse Zone, which was formed by a granitic intrusion into a fault zone. Illite crystallinity, vitrinite reflectance, and geobarometric investigations reveal a metamorphic and paleo-temperature anomaly associated with the granit...
Article
In Middle Devonian time, the following plate-tectonic units can be recognized in the Variscides of Central Europe: ● Old Red Continent, consisting of Laurentia + Baltica + Avalonia, with •a Silurian arc (resulting from the closure of the Rheic ocean) and • stranded Armorican fragments accreted to its southern margin. ● Rhenohercynian narrow ocean ●...
Article
Full-text available
 The Saxothuringian flysch basin, on the north flank of the Central European Variscides, was fed and eventually overthrust by the northwestern, active margin of the Tepla-Barrandian terrane. Clast spectra, mineral composition and isotopic ages of detrital mica and zircon have been analyzed in order to constrain accretion and exhumation of rocks in...
Article
&#112The Variscan fold belt of Europe resulted from the collision of Africa, Baltica, Laurentia and the intervening microplates in early Paleozoic times. Over the past few years, many geological, palaeobiogeographic and palaeomagnetic studies have led to significant improvements in our understanding of this orogenic belt. Whereas it is now fairly w...
Chapter
Within the unmetamorphosed part of the Rhenohercynian Belt, it is possible to distinguish one major, autochthonous part, and a number of allochthonous units. The autochthon is characterized by neritic and hemipelagic sequences, mostly of Devonian age, which represent the passive, southern margin of the Old Red Continent (see Chaps. I and III.A). Th...
Article
As laid out in Chapters V.B.1 and V.B.2, the parautochthonous Thuringian fades of the Saxothuringian Belt has been overthrust from the SE by nappes, which have survived in the core of the Vogtland Synform. These are the tectonic klippen of Münchberg, Wildenfels, and Frankenberg (in order from W to E; see Fig. 1). The klippen represent, in fact, ero...
Chapter
In the Saxothuringian Basin, it is possible to distinguish two fades realms, which have been termed the Thuringian and the Bavarian facies by Wurm (1925). Modern studies have confirmed models already proposed early in this century, in which the Bavarian facies rocks represent nappes emplaced on (para)autochthonous sequences developed in Thuringian...
Chapter
The map pattern of the Saxothuringian Belt is largely controlled by a number of large, NE-trending syn- and antiforms, which were formed at a late stage of tectonic deformation and therefore affect both the stratigraphic sequence and the metamorphic isograds. These fold structures are transsected by NW-trending fault zones, and by WNW- to NNW-trend...
Article
The brachyanticlinal structure of the Saxonian Granulite Complex was formed, or at least overprinted, by large-scale crustal extension, which is documented in an extreme reduction of the metamorphic profile and a pressure-temperature path with nearly isothermal decompression. the granulite is situated within a south-west-northeast trending belt cha...
Article
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The classical correlation by kossmat (1927) of the Saxothuringian belt of Germany with the West Sudetes of Poland is re-evaluated with special reference to the crystalline massifs of Munchberg and the Góry Sowie and the surrounding areas. Important common features are: Cambro-Ordovician magmatism and sedimentation; Silurian to Devonian radiolarian...
Article
The Late Devonian or Lower Carboniferous Russ Conglomerate contains granitic pebbles which yielded Early Ordovician U-Pb ages. Similar rocks with granite pebbles of approximately the same age occur in the Saxothuringian zone of Germany (NE-Bavaria), where the granitoids are also found as shallow-level intrusions into Early Paleozoic rift sequences....
Article
The provenance of synorogenic greywackes from Devonian flysch successions occupying structurally similar positions at opposite ends of the Rhenohercynian zone in SW England and Germany is evaluated. Greywackes from both regions are petrographically and chemically similar, although minor differences are seen in the relative proportions of lithics; t...
Article
Zusammenfassung Die Gießener Decke (südöstliches Rheinisches Schiefergebirge) läßt sich in eine nördliche (oberdevonische) und südliche (?unterkarbonische) Grauwackenserie untergliedern, die sich auch in ihrer Sedimentologie sowie durch kleinere Unterschiede in Geröllbestand, Schwermineralspektrum und Gesamtchemismus voneinander abgrenzen lassen.Pe...
Article
Full-text available
Crustal structure of the Rhenish Massif: results of deep seismic reflection lines Dekorp 2-North and 2-North-Q
Article
A new subdivision of the pre-Permian rocks of the Bohemian Massif into terranes is based on recent structural, kinematic and radiometric studies and on a comparison with the French Variscan Belt (mainly the Massif Central). Major tectonothermal events are attributed to the Variscan (390–300 Ma) and the terrane boundaries trending roughly SW-NE to S...
Article
The stage for the Variscan orogeny in Europe was set by the Cambro-Ordovician break-up of the northern margin of Gondwana into several microcontinental fragments separated by evolved rifts or narrow oceans. Further north there existed an older and wider ocean whose trace is probably marked by Caledonian sutures in the British Isles and at the south...
Article
The Variscan belt of Europe resulted from the collision of Africa with Baltica and intervening microplates. In early Paleozoic time, Baltica was probably separated from the areas farther south by a North-German/Polish ocean, whose trace is now under younger cover in the northern part of continental Europe. To the south followed an assembly of micro...
Chapter
The crustal structure and the geotectonic development of the Variscan Belt of Europe have been controversial for al long time. Early in this century, F.E.Suess (1912), Kossmat (1927) and others had published thrust-tectonic concepts for the Variscan Belt, which are nothing less but anticipations of modern structural concepts stimulated by plate tec...
Article
The Variscan Belt of Europe originated from the confrontation of northern Europe and Gondwana, with intervening pre-Variscan blocks (Cadomian and older: Armorica, Tepla-Barrandean, Moravo-Silesian). Though a strike-slip component cannot be excluded, geological evidence suggests a subduction/collision process. Newly discovered features include basal...
Article
The Saxothuringian zone is characterized by exotic blocks of relatively high-grade metamorphic rocks set among very low-grade Palaeozoic sequences. The Munchberg complex is a pile of later Proterozoic to early Palaeozoic volcanic and sedimentary rocks, some now at advanced states of metamorphism, in which both stratigraphic sequences and metamorphi...