Permian and Triassic

López-Gómez, Julián; Arché, Alfredo; Pérez-López, Alberto

doi:10.1144/gospp.10

Cited by 55 publications

(53 citation statements)

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“…Subsequent rifting started during the Early Permian in eastern and central Iberia, and is recorded by the sedimentary basins of the Pyrenees-Cantabrian and Iberian ranges (Sopeña et al, 1988;Arche and López-Gómez, 1996;López-Gómez et al, 2002). Rifting probably developed later in West Iberia, where, the oldest sedimentary unit associated with break-up is the Triassic Silves Group of the Lusitanian, Alentejo and Algarve basins (Palain, 1976;Pinheiro et al, 1996;Soares et al, 2012;Leleu et al, 2016).…”

Section: Tectonic Frameworkmentioning

confidence: 99%

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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Section: Tectonic Frameworkmentioning

confidence: 99%

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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“…The Variscan deformation lasted to about 290 Ma (Dallmeyer et al 1997, with the final, extensional collapse phase of the Variscan orogen having taken place during Stephanian B-C into the Permian across much of Iberia. Basin development was coeval with high heat flow, granitic and monzogranitic magmatism, uplift and extension, creating intramontane continental basins along all of Iberia's margins, possibly in conjunction with décollements along former thrust planes (López-Gómez et al 2002). In the Cantabrian Mountains several outcrops of dioritic dykes and sills intrude, and are folded along with Stephanian sediments of the CiñeraMatallana Coalfield (Allyón et al 2003).…”

Section: Geological Settingmentioning

confidence: 99%

Hydrothermal fluids influence on the thermal evolution of the Stephanian sequence, the Sabero Coalfield (NW Spain)

Botor¹

2012

geol

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In the present study, the thermal history of the Late Carboniferous (Stephanian) coal-bearing sediments of the Sabero Coalfield has been reconstructed in order to elucidate coal rank. The Sabero Coalfield is located in a small intramontane coal-bearing basin along the Sabero-Gordón fault zone, one of the major E-W trending strike-slip fault systems of the southern part of the Cantabrian Zone (NW Spain). The total thickness of the Stephanian succession is in excess of 2,000 m, and is composed of siliclastic rocks and intercalated coal seams with tonsteins. Mean vitrinite reflectance values in the Stephanian rocks in the Sabero Coalfield are in the range from 0.61 to 3.14% Rr, but most values are in the range from 0.8 to 1.5% Rr (based on 84 samples). Average vitrinite reflectance gradient is high (0.73% Rr/km), which suggests high value of average paleogeothermal gradient (52 o C/km). The maximum paleotemperatures calculated from vitrinite reflectance values for the Stephanian rocks range between 89 o C (top of the Stephanian) and 195 o C (bottom of the Stephanian). Coalification of the organic matter in the Stephanian rocks was achieved in the Early Permian, and was most likely related to several almost simultaneous related to magmatic and hydrothermal activity during high subsidence period in the pull-apart basin. The primary, burial-related maturity pattern, was probably slightly overprinted by fluid migration event, which is supposed to have occurred in Early Permian time.

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“…However, the possibility cannot be excluded that both factors, the Early Permian sedimentary burial and the increase in the geothermal gradient due to magmatic and hydrothermal activity, could have contributed to heating in Permian times. In the vicinity of the Sabero Coalfield, there is no Triassic or Jurassic sedimentary cover (Suárez-Rodrigues 1988;Martinez-Garcia 1981;Lopez-Gomez et al 2002). Subsequently, additional models were constructed for samples P89, P60, and P37 in order to check the possible influence of the Cretaceous heating being caused by burial, which can be connected with the Albian-Santonian sedimentary cover (Evers 1967) that has been documented at the western end of the Sabero Coalfield (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…It is unclear whether Permian to Cretaceous sediments once covered the SCZ and were eroded later, since Permian to Cretaceous sedimentary rocks are not present in the SCZ (Lopez-Gomez et al 2002). A former Permo-Triassic cover has been proposed (Alonso et al 1995), and some Cretaceous sedimentation can also be expected, as this was a period of renewed extensional tectonic activity across the Iberian microplate that caused widespread regional subsidence (Lobato et al 1984;Schwentke and Kuhnt 1992;Reicherter and Pletsch 2000).…”

Section: Geological Settingmentioning

confidence: 99%

Thermal history of the Sabero Coalfield (Southern Cantabrian Zone, NW Spain) as revealed by apatite fission track analyses from tonstein horizons: implications for timing of coalification

Botor

Anczkiewicz

2015

Int J Earth Sci (Geol Rundsch)

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Permian and Triassic

Cited by 55 publications

References 0 publications

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

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

Hydrothermal fluids influence on the thermal evolution of the Stephanian sequence, the Sabero Coalfield (NW Spain)

Thermal history of the Sabero Coalfield (Southern Cantabrian Zone, NW Spain) as revealed by apatite fission track analyses from tonstein horizons: implications for timing of coalification

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