Precambrian basement in the Rheic suture zone of the Central European Variscides (Odenwald)

Dörr, Wolfgang; Stein, Eckardt

doi:10.1007/s00531-019-01741-7

Cited by 23 publications

(14 citation statements)

References 66 publications

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“…In terms of tectosedimentary dynamics, Early to Middle Paleozoic sedimentation was mainly controlled by a general thinning of the continental crust due to crustal extension/ transtension and associated subsidence (e.g., Loeschke and Heinisch 1993;Schönlaub and Histon 2000), as supported by similarities in the major and trace element composition of all studied sequences, which may alternatively result from the aforementioned recycling processes. The proto-Alpine Paleozoic accretionary orogen was characterized by a relatively short timespan between sedimentation and subsequent metamorphism, indicating relatively rapid deformation and exhumation (Table 1; Mader et al 2007;Cavargna-Sani et al 2014;Zurbriggen 2017;Oriolo et al 2021), as also documented in adjacent regions (e.g., Dörr and Stein 2019). Likewise, the common presence of intrabasinal magmatism, together with evidence of recycling of adjacent (meta)sedimentary rocks and moderate sediment maturity (Sect.…”

Section: Tectonic and Paleogeographic Implicationsmentioning

confidence: 87%

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The birth of the Alps: Ediacaran to Paleozoic accretionary processes and crustal growth along the northern Gondwana margin

Siegesmund

Oriolo

Schulz

et al. 2021

Int J Earth Sci (Geol Rundsch)

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New whole-rock geochemical and coupled U–Pb and Lu–Hf LA-ICP-MS zircon data of metasedimentary rocks of the Austroalpine, South Alpine and Penninic basement domains are presented, to disentangle the pre-Variscan tectonic evolution of the proto-Alps. The studied units seem to record distinct stages of protracted Late Ediacaran to Carboniferous tectonosedimentary processes prior to the Variscan collision. In the case of Austroalpine and South Alpine units, nevertheless, no major differences in terms of provenance are observed, since most detrital zircon samples are characterized by a major Pan-African peak. Their detrital zircon spectra record a provenance from the northeastern Saharan Metacraton and the Sinai basement at the northern Arabian-Nubian Shield, being thus located along the eastern Early Paleozoic northern Gondwana margin, whereas sources located further west are inferred for the Penninic Unit, which might have been placed close to the Moldanubian Unit of the Bohemian Massif. In any case, it is thus clear that the Alpine basement remained in a close position to the Gondwana mainland at least during the Early Paleozoic. The Late Ediacaran to Silurian tectonic evolution, which includes Cadomian and Cenerian tectonometamorphic and magmatic processes, seem thus to record a continuum related to a retreating-mode accretionary orogen, with diachronous back-arc basin opening and possibly discrete compressional/transpressional pulses linked to changes in subduction zone dynamics. On the other hand, it is inferred that the Alpine basement essentially comprises Pan-African metasedimentary and subordinate metaigneous rocks, possibly with very few Early Neoproterozoic relics. This basement was significantly reworked during the protracted Paleozoic orogenic evolution, due to anatexis and/or assimilation by mantle-derived juvenile magmatism.

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Section: Tectonic and Paleogeographic Implicationsmentioning

confidence: 87%

“…550-540 Ma (Figs. 10, 11;Peucat 1986;Zulauf et al 1999;Dörr et al 2002;Linnemann et al 2007Linnemann et al , 2014Garfunkel 2015;von Raumer et al 2015;Moghadam et al 2017Moghadam et al , 2019Dörr and Stein 2019;Oriolo et al 2021).…”

Section: Tectonic and Paleogeographic Implicationsunclassified

The birth of the Alps: Ediacaran to Paleozoic accretionary processes and crustal growth along the northern Gondwana margin

Siegesmund

Oriolo

Schulz

et al. 2021

Int J Earth Sci (Geol Rundsch)

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“…Thermal modeling for the southern Bergsträsser Odenwald implies that the exhumation rate reached a maximum of 1.3 mm/a with average rates of 0.2 mm/a from 338 Ma to 333 Ma (Henk, 1995). Recently, the basement rocks of Unit I on the Sprendlinger Horst were assigned to a Cadomian basement (Dörr and Stein, 2019). The Dieburg metagranite in this region was dated to 540 +/-8 Ma.…”

Section: Geological Settingmentioning

confidence: 98%

Rock alteration at the post-Variscan nonconformity: implications for Carboniferous-Permian surface weathering versus burial diagenesis and paleoclimate evaluation

Liang¹,

Ni²,

Linsel³

et al. 2021

Preprint

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Abstract. A nonconformity refers to a hiatal surface located between metamorphic or igneous rocks and overlying sedimentary or volcanic rocks. Those surfaces are key features to understand the relations among climate, lithosphere and tectonic movements during ancient time. In this study, the petrological, mineralogical, and geochemical characteristics of Variscan basement rock and its overlying Permian volcano-sedimentary succession from a drill core in the Sprendlinger Horst, Germany are analyzed by means of polarization microscopy, and environmental scanning electron microscope, X-Ray diffraction, X-ray fluorescence and Inductively Coupled Plasma Mass Spectrometry analyses. In the gabbroic diorite of the basement, the intensity of micro- and macro-fractures increases towards the top indicating an intense physical weathering. The overlying Permian volcanic rock is a basaltic andesite which shows less intense physical weathering compared to the gabbroic diorite. In both segments, secondary minerals are dominated by illite and a mix-layer phase of illite and smectite (I/S). The corrected chemical index of alteration (CIA) and the plagioclase index of alteration (PIA) indicate an intermediate to unweathered degree in the gabbroic diorite and an extreme to unweathered degree in the basaltic andesite. The τ value for both basaltic andesite and gabbroic diorite indicate an abnormal enrichment of K, Rb, and Cs that cannot be observed in the overlying Permian sedimentary rocks. Accompanying hydrothermal minerals such as adularia suggest subsequent overprint by (K-rich) hydrothermal fluids during burial diagenesis which promoted the conversion from smectite to illite. The overall order of element depletion in both basaltic andesite and gabbroic diorite during the weathering process is as follows: Large Ion Lithophile Elements (LILE) > Rear earth elements (REE) > High Field Strength Element (HFSE). Concerning the REE, heavy rare earth elements (HREE) are less depleted than light rare earth elements (LREE). Our study shows that features of supergene physical and chemical paleo-weathering are well conserved at the post-Variscan nonconformity despite hypogene alteration. Both can be distinguished by characteristic minerals and geochemical indices, with the results, a new workflow to eliminate distractions for paleoclimate evaluation and evolution is well developed.

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“…2B brown colour). Parts of the MGCZ (Cadomian basement of the West Odenwald, Dörr and Stein 2019;South Spessart, Kirchner and Albert 2020;South Ruhla, Zeh and Gerdes 2010, Fig. 2B brown colour) belong also to Armorica.…”

Section: Introductionmentioning

confidence: 99%

“…40-60% Ediacaran) and age peaks of 600-640 Ma. Typical is the 9-30% input of Mesoproterozoic zircons (Linnemann et al 2012;Murphy et al 2004a;Willner et al 2013;Dörr and Stein 2019;Herbosch et al 2020). The Armorican age spectrum of the detrital zircons is related to the West African Craton, which contains also mainly Neoproterozoic zircons but with Cadomian age peaks from 540 to 570 Ma.…”

Section: Introductionmentioning

confidence: 99%

Provenance of lower Palaeozoic metasediments of the East Odenwald (Mid-German-Crystalline Zone, Variscides)—a correlation with the East European Platform (Poland)

Dörr

Stein

Kirchner

et al. 2021

Int J Earth Sci (Geol Rundsch)

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U–Pb age spectra of detrital zircons related to the East European Platform could be traced in paragneiss through the whole Mid-German-Crystalline Zone (Variscides, Central Europe) from the Odenwald via the Spessart to the Ruhla crystalline forming an exotic unit between Armorica and Laurussia. The depositional ages of the paragneiss are defined by the youngest age of the detrital zircons and the oldest intrusion ages as Ordovician to Silurian. The Ediacaran dominated age spectrum of detrital zircons from the paragneiss of the East Odenwald suggests the latter to be derived from the shelf of the East European Platform (Baltica), which was influenced by the 1.5 Ga old detritus delivered from a giant intrusion (Mazury granitoid, Poland). The detrital zircon age spectrum of the lower Palaeozoic paragneiss of the East Odenwald and sandstone of the northern Holy Cross Mountains are identical. The pure Sveconorwegian spectrum of the lower Palaeozoic quartzite from the Spessart, (Kirchner and Albert Int J Earth Sci 2020) and the Ruhla (Zeh and Gerdes Gondwana Res 17:254–263, 2010) could be sourced from Bornholm and southern Sweden. A U–Pb age spectrum with 88% Palaeozoic detrital zircons from a volcano-sedimentary rock of the East Odenwald is interpreted to be derived from a Silurian magmatic arc (46%), which was probably generated during the drift of the Mid-German-Crystalline Zone micro-continent to the south. A tentative plate tectonic model of Mid-German-Crystalline Zone is presented taking into account (a) the East European Platform related age spectra of the detrital zircons (b) the Ordovician to Silurian depositional age of the metasediments (c) the Silurian and Early Devonian intrusion age of the plutonic and volcanic rocks and (d) the U–Pb ages of the Middle Devonian high-grade metamorphism. The East European Platform-related part of the Mid-German-Crystalline Zone is interpreted as a micro-continent, which drifted through the Rheic Ocean to the south and collided with the Saxothuringian (Armorican Terrane Assemblage) during the Early Devonian. Such large-scale tectonic transport from the northern continent to the southern continent is also known from the SW Iberia, where Laurussia-related metasediments of the Rheic suture zone are explained by a large scale tectonic escape (Braid et al. J Geol Soc Lond 168:383–392, 2011).

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Precambrian basement in the Rheic suture zone of the Central European Variscides (Odenwald)

Cited by 23 publications

References 66 publications

The birth of the Alps: Ediacaran to Paleozoic accretionary processes and crustal growth along the northern Gondwana margin

The birth of the Alps: Ediacaran to Paleozoic accretionary processes and crustal growth along the northern Gondwana margin

Rock alteration at the post-Variscan nonconformity: implications for Carboniferous-Permian surface weathering versus burial diagenesis and paleoclimate evaluation

Provenance of lower Palaeozoic metasediments of the East Odenwald (Mid-German-Crystalline Zone, Variscides)—a correlation with the East European Platform (Poland)

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