Transition from Diagenesis to Metamorphism Near the Front of the Variscan Regional Metamorphism (Cantabrian Zone, Northwestern Spain)

Brime, Covadonga; García-López, Susana; Bastida, Fernando; Valín, M. Luz; Sanz-López, Javier; Aller, J.

doi:10.1086/319978

Cited by 37 publications

(48 citation statements)

References 38 publications

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“…The Cantabrian Zone is essentially regarded as a non-metamorphic unit. Several studies dealing with illite crystallinity, vitrinite reflectance, cleavage development and conodont colour alteration index have been published (Brime 1985, Aller et al 1987, Alonso & Brime 1990, Colmenero & Prado 1993, García-López et al 1997, Brime et al 2001. They have shown the distribution and main features of the various zones within the transition from diagenesis to metamorphism, formed during at least two episodes of low-temperature metamorphism in the Cantabrian Zone, which influenced the Carboniferous sediments.…”

Section: Resultsmentioning

confidence: 99%

“…However, low-grade metamorphism developed locally (Aller & Brime 1985, Aller 1986, Raven & Van der Pluijm 1986, Colmenero & Prado 1993, García-López et al 1997, Brime et al 2001, Frings et al 2004. Two distinct metamorphic events affected the CZ.…”

Section: Geological Settingmentioning

confidence: 99%

“…Metamorphic grade (up to epizone) is higher in older rocks. It developed previously and/or during the early stages of thrusting, with little of post-thrusting metamorphism resulting from tectonic loading (Raven & Van der Pluijm 1986, García-López et al 1997, Brime et al 2001. The second event is late-to post-Variscan and is thought to be Late Stephanian-Early Permian in age (Aller 1986, García-López et al 1999, Brime et al 2001).…”

Section: Geological Settingmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

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

Botor¹

2012

geol

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“…Aller et al (2005) argued that increased heat flow due to hydrothermal-fluid circulation was the last important thermal episode in the SCZ, facilitated by pathways along faults. As a consequence, the effects of this episode are irregularly distributed within the basins (Brime et al 2001;Aller et al 2005). Fluid inclusion results confirm that there was fracture-controlled fluid flow along thrusts and/or strike-slip faults (Gasparrini et al 2003(Gasparrini et al , 2006Ayllon et al 2003).…”

Section: Geological Settingmentioning

confidence: 71%

“…3.96 % Rmax) in rare cases, mostly in close association with sills (Botor et al 2009). Estimated geothermal gradients of 52 °C/km (Botor 2012) are lower than those at other Stephanian basins (Mendez 1985;Frings et al 2004;Ayllon et al 2003) and in the Palaeozoic basement (c. 35 °C/km; Brime et al 2001). Aller et al (2005) argued that increased heat flow due to hydrothermal-fluid circulation was the last important thermal episode in the SCZ, facilitated by pathways along faults.…”

Section: Geological Settingmentioning

confidence: 80%

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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Unconventional gas resources in theCantabrian Zone(NW Spain): A comprehensive preliminary assessment

et al. 2018

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With the aim of acquiring a better knowledge of the potential for unconventional gas resources in Spain, 134 rock samples were taken from 12 lithostratigraphic units in the Cantabrian Zone (north‐west Spain) and studied for a 3‐year period. The selected units gather, a priori, the basic conditions to constitute potential source rocks for unconventional hydrocarbons. Petrographic studies and total organic carbon analyses were carried out for all samples, whereas Rock‐Eval pyrolysis and vitrinite reflectance measurements with kerogen visual analysis were performed on selected samples. Lutites, litharenites, limestones, and slates are the predominant petrographic types. In most cases, the mean total organic carbon content is below the 2% limit for good quality potential source rocks. Only the Jurassic Rodiles and Tereñes limestones show total organic carbon values above this threshold. Rock‐Eval data reveal very low potential for hydrocarbon generation in almost all cases, with the exception of the dark mudstones of the Carboniferous Barcaliente Formation and the Rodiles Formation (fair and good potential for hydrocarbon generation, respectively). As regards thermal maturation, only the Ordovician formations are located in the peak of the gas generation interval. The Barcaliente and Rodiles formations are near the frontier oil/wet gas maturation areas, and the rest of the units are immature for gas generation.

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Transition from Diagenesis to Metamorphism Near the Front of the Variscan Regional Metamorphism (Cantabrian Zone, Northwestern Spain)

Cited by 37 publications

References 38 publications

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

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

Unconventional gas resources in theCantabrian Zone(NW Spain): A comprehensive preliminary assessment

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