Structure

Oncken, Onno; Franzke, H. J.; Dittmar, U.; Klügel, Th.

doi:10.1007/978-3-642-77518-5_10

Cited by 7 publications

(1 citation statement)

References 15 publications

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“…They consist of meta-andesites and meta-rhyolites and are interpreted as small relics of a magmatic arc , 2023, Oncken et al 1995. U-Pb-dating of zircons yielded not more precise than Silurian (Sommermann et al 1992(Sommermann et al , 1994.…”

Section: Southern Taunus Unit (Phyllite Zone)mentioning

confidence: 99%

Dualism of intraplate and subduction-related volcanism in the Palaeozoic of the Rhenish Massif (Central Europe) and its plate tectonic relevance

Nesbor

2024

Preprint

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Palaeozoic volcanic rocks are widely distributed within the sedimentary rock sequence of the Rhenish Massif. A total of 185 new geochemical analyses of these have been evaluated, allowing a distinction based on indicative trace elements and rare earth elements between intraplate volcanism and subduction-related volcanism. The latter began in the Silurian and continued through the entire Devonian and likely into the early Carboniferous. The trigger for the volcanic activities was the subduction of the Rheic Ocean northward beneath the southern margin of Avalonia. A magmatic arc had developed above the subduction zone, where explosive eruptions occurred throughout the entire timespan. To the north the Rhenohercynian back-arc basin opened from the Lower Devonian onwards, whereby Avalonia was spited into a northern and a southern part. As a result of the increasing rifting of the thinned continental crust of the southern Avalonian shelf area, intense bimodal intraplate volcanism began in the Givetian, parallel to the subduction-related volcanism, persisting until the early Frasnian. The first volcanic cycle ended, after a long interruption in the deeper Upper Devonian, with the eruption of primitive basaltic magma in the highest Famennian. Due to the retreat of the subduction zone (roll back), Southern Avalonia migrated increasingly southward with simultaneous expansion of the back-arc basin. A new volcanic cycle began in the Early Carboniferous, which is characterized by an evolution from tholeiitic to alkaline basaltic magma. The products of both volcanic cycles occupy large areas in the Lahn-Dill region, the Kellerwald, and the Waldeck region. Subvolcanic intrusions and feeder dykes in the Northern Taunus and Sauerland evidence the widespread distribution of volcanism beyond the present-day limits imposed by erosion.

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Section: Southern Taunus Unit (Phyllite Zone)mentioning

confidence: 99%

Dualism of intraplate and subduction-related volcanism in the Palaeozoic of the Rhenish Massif (Central Europe) and its plate tectonic relevance

Nesbor

2024

Preprint

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Crustal lithology vs. thermal state and Moho heat flow across the NE part of the European Variscan orogen: a case study from SW Poland

Puziewicz

Czechowski

Grad

et al. 2019

Int J Earth Sci (Geol Rundsch)

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Geotherms of four crustal profiles across the Variscan orogen in SW Poland have been constructed to better understand the variation in thermal state of the region. Seismic and drilling data as well as rock sequences in exposed parts of the orogen were used for Wilcza Góra (Sudetic Block), Polkowice-Rudna (Middle Odra Horst), Święciechowa (Wolsztyn-Leszno Horst) and Września (Szczecin-Miechów Synclinorium within TESZ) profiles. The palaeoclimate-corrected surface heat flow map and the heat-production calculations based on literature data enabled the construction of geotherms and estimation of Moho heat flow. Exception is the Polkowice-Rudna profile, where the surface heat flow was calculated using temperature measurements in underground copper mines, and K, U and Th contents and density/heat conductivity measurements in rocks drilled in the Middle Odra Horst were used to calculate geotherm. The basaltic lava migration through the lithospheric mantle and its effect on crustal geotherm in Wilcza Góra (area of Cenozoic alkaline volcanism at ca. 30-18 Ma) was shown to increase slightly both current surface and current Moho heat flow (by ca. 4 mW/m 2). The presented approach couples geological and geophysical information and thus differs from standard purely geophysical assessment of lithosphere thermal state. It shows that surface heat flow is enlarged to 84 mW/m 2 by granitic plutons in the upper crust in the Lubin-Polkowice site. Heat flow on the Moho varies from 28 to 34 mW/m 2 in sites located in the Sudetic-/Fore-Sudetic Blocks, Middle Odra Horst and Wolsztyn-Leszno Horst. Locally it may slightly increase because of extraneous heat input by Cenozoic basaltic volcanism, but the values close to 30 mW/m 2 are specific for mantle root of Saxothuringian Zone in SW Poland. Mantle heat flow is 36 mW/m 2 in Września site and supposedly is a manifestation of different nature of lithospheric mantle underlying TESZ.

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Tectonic processes during collisional orogenesis from comparison of the Southern Uralides with the Central Variscides

Álvarez-Marrón¹

2002

Mountain Building in the Uralides: Pangea to the Present

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Structure

Cited by 7 publications

References 15 publications

Dualism of intraplate and subduction-related volcanism in the Palaeozoic of the Rhenish Massif (Central Europe) and its plate tectonic relevance

Dualism of intraplate and subduction-related volcanism in the Palaeozoic of the Rhenish Massif (Central Europe) and its plate tectonic relevance

Crustal lithology vs. thermal state and Moho heat flow across the NE part of the European Variscan orogen: a case study from SW Poland

Tectonic processes during collisional orogenesis from comparison of the Southern Uralides with the Central Variscides

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