Simultaneous use of thermal indicators to analyse the transition 
from diagenesis to metamorphism: an example from the Variscan 
Belt of northwest Spain

García-López, Susana; Brime, Covadonga; Bastida, Fernando; Sarmiento, Graciela N.

doi:10.1017/s0016756897006882

Cited by 37 publications

(32 citation statements)

References 16 publications

(20 reference statements)

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“…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%

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: 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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“…The Permian heating phase in the Sabero Coalfield (Fig. 3) was probably caused by the well-known magmatism and its associated hydrothermal activity under an extensional tectonic regime (Aller et al 2005;García-López et al 1997, 2007. The important heating phase had a significant thermal effect due to a deep source of heat.…”

Section: Discussionmentioning

confidence: 97%

“…Therefore, new models (Fig. 3) were constructed taking into account previous thermal history studies in the SCZ (García-López et al 1997, 2007Ayllon 2003;Ayllon et al 2003;Frings et al 2004;Aller et al 2005;Frings and Warr 2012;Botor 2012), which indicated that the Late Carboniferous-Permian period was the main heating time. Vitrinite reflectance data were used to calculate the maximum palaeotemperatures (values T max 2 and T max 3 in Fig.…”

Section: Discussionmentioning

confidence: 99%

“…These basins are considered to have initially formed as small pullapart basins along strike-slip fault systems under a Late Carboniferous syn-orogenic transtensional regime (Julivert 1971;Reading 1975;Heward and Reading 1980;Wagner and Winkler-Prins 1985;Alonso et al 1995;García-López et al 1997, 2007Bastida et al 1999). Many of these basins in the Southern Cantabrian Zone (SCZ) were structurally controlled by a major E-W trending Variscan strikeslip fault system, named the Sabero-Gordon Line (Julivert 1971;Reading 1975;Heward and Reading 1980;Alonso et al 1995;García-López et al 1997, 2007Bastida et al 1999). Transpressional faulting and folding during the later Abstract Apatite fission track (AFT) central ages from Carboniferous (Stephanian) tonsteins of the Sabero Coalfield, NW Spain, range from 140.8 ± 7.5 to 65.8 ± 8.1 Ma (Cretaceous), with mean c-axis projected track length values ranging from 12.5 to 13.4 μm.…”

Section: Introductionmentioning

confidence: 99%

“…Geological data combined with thermal models of AFT data indicate that Stephanian strata reached the maximum palaeotemperatures in the Permian period, which was therefore the major time of the coalification processes. The Permian magmatic activity was responsible for a high heat flow, which, with the added effect of sedimentary burial, could account for 1 3 stages of the Variscan orogeny at the end of the Carboniferous to the early Permian resulted in basin closure and inversion (Julivert 1971;Alonso et al 1995;García-López et al 1997, 2007Bastida et al 1999). This study examines the thermal history of one of these small basins (~12-15 km long and 3-4 km wide) located along the eastern end of the Sabero-Gordon fault line (Fig.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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Structural, Reverse‐Basin and Forward Stratigraphic Modelling of the Southern Cantabrian Basin, Northwest Spain

Veselovský¹,

Bechstädt

Zühlke

2008

Analogue and Numerical Modelling of Sedimentary Systems: From Understanding to Prediction

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The evolution of the Palaeozoic Southern Cantabrian Basin is quantified by a multidisciplinary approach of structural balancing, reverse-basin and forward stratigraphic modelling. These methods were applied to the N-S trending, 54 km long Bernesga Transect in the Cantabrian Mountains. Total tectonic shortening of the Southern Cantabrian Basin amounted to a minimum of 54%. These data were derived from two-dimensional structural balancing of the deformed basin infill. Two-dimensional reverse-basin modelling was used for analysing the evolution of the basin architecture, considering lithofacies, incremental compaction, eustatic sea-level changes and flexural loading of the crust. The model comprises the entire basin infill between the top of the Neoproterozoic basement and the time of maximal burial (Cenozoic). Six major subsidence trends, with time spans between 9 and 65 Myr, subdivide the long-term evolution of accommodation space in time. These trends reflect different lithospheric configurations prior to, during and after the Variscan Orogeny, having been primarily triggered by major changes in thermo-tectonic and flexure-induced subsidence, as well as by regional and extraregional tectonics. Basin modelling permits the identification of two encroachment subcycles during the Silurian and Devonian, as well as the approach of the Variscan orogenic front in the Early Carboniferous. The latter is reflected by migrating, strongly subsiding depocentres (orogenic foredeep), controlled by increased flexural-induced and thermo-tectonic subsidence. Two-dimensional stratigraphic forward modelling was used to simulate the evolution of the Southern Cantabrian Basin, and to quantify internal and external parameters governing deposition (e.g. sediment transport, sedimentation rates, in-situ carbonate production, erosion and compaction). The model includes data from the Neoproterozoic to the Lower Carboniferous with a focus on the Devonian. Carbonate factories in the Devonian were controlled by fluctuating siliciclastic input and differential thermo-tectonic subsidence, and subordinately influenced by eustatic sea-level changes. Decompacted carbonate production rates reach up to 780 m Myr −1 . The changes in carbonate production rates mirror the drift of Iberia from cooler to subtropical/tropical conditions during Devonian times.

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Simultaneous use of thermal indicators to analyse the transition from diagenesis to metamorphism: an example from the Variscan Belt of northwest Spain

Cited by 37 publications

References 16 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

Structural, Reverse‐Basin and Forward Stratigraphic Modelling of the Southern Cantabrian Basin, Northwest Spain

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