The Cadomian Orogeny and the opening of the Rheic Ocean: The diacrony of geotectonic processes constrained by LA-ICP-MS U–Pb zircon dating (Ossa-Morena and Saxo-Thuringian Zones, Iberian and Bohemian Massifs)

Linnemann, Ulf; Pereira, M. Francisco; Jeffries, Teresa; Drost, Kerstin; Gerdes, Axel

doi:10.1016/j.tecto.2008.05.002

Cited by 407 publications

(289 citation statements)

References 35 publications

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“…In contrast, the GQ correspond to sediments deposited on the Gondwanan PM after separation of avalonia. The evolutionary scheme for the sedimentary basins and tectonic settings proposed for the OSD metasediments described in the present work is in agreement with the tectonic scenario suggested for the evolution of the neoproterozoic to Ordovician volcano-sedimentary successions preserved in the Saxo-Thuringian in Germany, and the Ossa-Morena and Central Iberian Zones in Portugal and Spain (e.g., Pereira et al 2006;linnemann et al 2008). Moreover, it corroborates current hypotheses for the formation of the Rheic Ocean (e.g., arenas et al 2007, Sánchez-García et al 2008Martinez et al 2009).…”

Section: Introductionsupporting

confidence: 89%

“…In Europe, the internal part of the orogenic belt includes some rock complexes which contain Cadomian basement derived from an arc developed at the Gondwanan margin during latest neoproterozoic (e.g., Fernandez-Suarez et al 2003;linnemann et al 2008). This arc was later detached from the edge of Gondwana during late Cambrian-Early Ordovician times and drifted northward, resulting in the opening of the Rheic Ocean Murphy et al 2009;nance et al 2010).…”

Section: Introductionmentioning

confidence: 99%

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From Cadomian arc to Ordovician passive margin: geochemical records preserved in metasedimentary successions of the Orlica-Śnieżnik Dome in SW Poland

Szczepański

Ilnicki

2014

Int J Earth Sci (Geol Rundsch)

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Section: Introductionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

From Cadomian arc to Ordovician passive margin: geochemical records preserved in metasedimentary successions of the Orlica-Śnieżnik Dome in SW Poland

Szczepański

Ilnicki

2014

Int J Earth Sci (Geol Rundsch)

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“…The Cryogenian to Ediacaran population (peaks at c. 625 and 580 Ma) corresponds with the Pan-African and Cadomian orogenies, which overlap temporally in northern Gondwana regions (Murphy and Nance, 1991;Nance and Murphy, 1994;Linnemann et al, 2008). The zircon ages that can be attributed to these orogenic events are almost ubiquitous in Ediacaran and Paleozoic metasedimentary successions of the Iberian Massif.…”

Section: Main Zircon Forming Events and Sourcesmentioning

confidence: 93%

The transition from Pangea amalgamation to fragmentation: Constraints from detrital zircon geochronology on West Iberia paleogeography and sediment sources

Dinis

Fernandes

Jorge

et al. 2018

Sedimentary Geology

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Detrital zircon U-Pb geochronology data from late Carboniferous to Triassic clastic sedimentary rocks in SW Iberia were used to investigate the regional paleogeography during the transition from Pangea amalgamation to breakup. The major U-Pb zircon age peaks are middle Devonian to Carboniferous (~390-300 Ma), CambrianOrdovician (~530-440 Ma), Cryogenian-Ediacaran (~750-540 Ma), Stenian-Tonian (~1.2-0.9 Ga) and Paleoproterozoic (~2.3-1.8 Ga). Rapid exhumation of Variscan crystalline rocks at the contact between the South Portuguese zone and Ossa Morena Zone, explains the abundance of late Paleozoic ages in the upper Carboniferous-lower Permian continental successions. The U-Pb zircon data constrain the maximum depositional age of the Santa Susana Basin to c. 304 Ma and the Viar Basin to c. 297 Ma. The Triassic sequences, despite being c. 100 Ma younger than the Variscan tectonothermal events, contain low proportions of late Paleozoic zircon. The major peaks in all zircon spectra closely resemble those found in the adjacent basement rocks, indicating small source areas, mainly located near the rift shoulders. Longer travelled fluvial systems are postulated for the eastern portions of the Algarve Basin, which was closer to the westward advancing Tethys Ocean than the rift basins of West Iberia. Sequences that contain significant proportions of~1.2-0.9 Ga zircon are probably recycled from post-collisional Carboniferous-Permian continental deposits that were more extensive than those found today.

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“…The most pronounced age maximum spans the interval of 500-640 Ma with maximum data density between 540-600 Ma. The Neoproterozoic protolith ages of 540-580 Ma are typical of granitoids and orthogneisses of the Brunovistulian (van Breemen et al 1982;Scharbert and Batík 1985;Fritz et al 1996;Friedl et al 2000Friedl et al , 2004; see Leichmann and Höck 2008 for review) as well as Saxothuringian and Lugian domains (Hegner and Kröner 2000;Tichomirowa et al 2001;Linnemann et al 2008 and references therein) and they only rarely appear as protolith ages of Moldanubian orthogneisses (Schulmann et al 2005). Importantly, Cambrian ages of 500-520 Ma are absent in the Moravo-Silesian Domain (Brunia), but they are known as the most frequent protolith ages of the Moldanubian orthogneisses, as well as of some ortho gneisses in the Saxothuringian and Lugian domains (Vrána and Kröner 1995;Hegner and Kröner 2000;Tichomirowa et al 2001;Friedl et al 2004;Schulmann et al 2005).…”

Section: Geochronological Datamentioning

confidence: 99%

Metamorphic history of skarns, origin of their protolith and implications for genetic interpretation; an example from three units of the Bohemian Massif

Pertoldová¹,

Týcová²,

Verner³

et al. 2012

Jour. Geosci.

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Skarns in the Svratka Unit, in the neighbouring part of the Moldanubian Zone and in the Kutná Hora Complex were studied with respect to their metamorphic evolution, major-and trace-element geochemistry, oxygen isotopic composition and zircon ages. Skarns form competent lenses and layers in metamorphosed siliciclastic rocks and preserve some early deformation structures and several equilibrium assemblages representing the products of successive metamorphic reactions. The main rock-forming minerals, garnet and clinopyroxene, are accompanied by less abundant magnetite, amphibole, plagioclase, epidote ± quartz. In the Svratka Unit the early prograde M 1 , prograde/peak M 2 , and retrograde M 3 metamorphic stages have been distinguished. Metamorphic conditions in skarns of the Moldanubian Zone are limited to a relatively narrow interval of amphibolite facies. The prograde and retrograde events in the Kutná Hora Complex skarns probably took place under amphibolite-facies conditions. The presence of magnetite and the increasing proportion of the andradite component in the garnet indicate locally increased oxygen fugacity. Skarn geochemistry does not show systematic differences in the skarn composition among the three units. The regional variations are exceeded by differences among samples from individual localities. The Al 2 O 3 /TiO 2 , Al 2 O 3 /Zr, TiO 2 /Nb ratios point to the variable proportion of the detrital material, combined in skarn protoliths with CaO and FeO, the major non-detrital components. The skarns exhibit elevated abundances of Cu, Zn, Sn and As. The Eu/Eu* ratio varies in the range of 0.5-8.6, the total REE contents vary from 8 to 345 ppm. The lowest ΣREE values (< 100 ppm) occur in skarns with magnetite mineralization. The wide intervals of ΣREE and Eu/Eu* values are interpreted to indicate variations in the temperature and redox conditions among layers of the same locality and at various localities. The oxygen isotope compositions of garnets, pyroxenes and amphiboles from skarns of the Svratka Unit exhibit a range of δ 18 O = 0.1 to 4.1 ‰. In situ (laser-ablation ICP-MS) U-Pb dating of zircon from one of the Svratka Unit skarn bodies yielded a wide range of ages (0.5-2.6 Ga), supporting the detrital origin of this zircon population. The skarn protoliths were probably rocks of mixed detrital-exhalative origin deposited on the sea floor. The geological position of skarns, with their structural and metamorphic record, probably reflect tectono-metamorphic evolution shared with that of their host rocks. The geochemical characteristics, including oxygen isotopic compositions and the presence of detrital zircons with a wide range of ages exclude metasomatic, and point to a sedimentary-exhalative mode of origin for the studied skarns.

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The Cadomian Orogeny and the opening of the Rheic Ocean: The diacrony of geotectonic processes constrained by LA-ICP-MS U–Pb zircon dating (Ossa-Morena and Saxo-Thuringian Zones, Iberian and Bohemian Massifs)

Cited by 407 publications

References 35 publications

From Cadomian arc to Ordovician passive margin: geochemical records preserved in metasedimentary successions of the Orlica-Śnieżnik Dome in SW Poland

From Cadomian arc to Ordovician passive margin: geochemical records preserved in metasedimentary successions of the Orlica-Śnieżnik Dome in SW Poland

The transition from Pangea amalgamation to fragmentation: Constraints from detrital zircon geochronology on West Iberia paleogeography and sediment sources

Metamorphic history of skarns, origin of their protolith and implications for genetic interpretation; an example from three units of the Bohemian Massif

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