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DIGITAL.CSIC
Article . 2008 . Peer-reviewed
Data sources: DIGITAL.CSIC
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Docta Complutense
Article . 1996
Data sources: Docta Complutense
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Subsidence analysis, maturity modelling and hydrocarbon generation of the Alpine sedimentaty sequence in the MW ofthe Iberian Ranges (Central Spain)

Authors: Ramos, Alfredo; Sopeña, Alfonso; Sánchez Moya, Yolanda; Muñoz Martín, Alfonso;

Subsidence analysis, maturity modelling and hydrocarbon generation of the Alpine sedimentaty sequence in the MW ofthe Iberian Ranges (Central Spain)

Abstract

[EN] The burial, thermal and hydrocarbon histories of late Permian-Tertiary sedimentary succession in the NW of the Iberian Ranges were investigated using asingle-well model. The reconstructed geobistories indicate four stages of evolution during early Alpine to late Alpine infill in the studied area: late Permian, Triassic, early and middle Jurassic, and latest Jurassic-middle Cretaceous. The differences between interpreted basement behaviour interpreted from tectonic subsidence curves differentiates four major «rift-uplift realms ». The «riftluplift» realm is defined either as an individual fault-bounded structural domain of ifie continental phase of the rift system or as an uplift that displays similar extensional/uplift proeesses. Thcse «riftlupliftrealms » show a propagation of rifting/uplift stages through time. The initial Permian, Triassic and Jurassic episodes show a north-eastem propagation foliowed by a south-western propagation from the Central realm. Each of these realms shows aLo a gradual north-eastern progress of the extension strain. The Cretaceous rift/uplift stage seems to behave in the opposite direction. Present day bottom heat flow and thermal history were modelled, using both a steady sUite thermal aud a paleothermal heat flow-invariant model. Thc present average bottom heat flow oblained faills within the range of values reported in the literature from similar tectonic contexts. Different hcat flow values were tentatively adopted to determine maturation. Ml the quantitative estimations of generated hydrocarbons indicate that insignificant volumes of hydrocarbons were generated by source rocks considered in this study.

[ES] A partir de los datos geológicos disponibles, se ha realizado lamodelización computerizada de la evolución térmica y de la generación de hidrocarburos de la sucesión sedimentaria pérmico-terciaria en elNWde la Cordillera Ibérica. El análisis de la subsidencia indica que existen cuatro estadios diferenciados en la evolución Mesozoica de este área durante el ciclo de sedimentación Alpino. Estas cuatro etapas corresponden al Pérmico superior, Triásico, Jurásico inferior y medio, y Jurásico superior-Cretácico medio. Las diferencias observadas en las curvas de subsidencia tectónica obtenidas, permiten diferenciar cuatro dominios de cxtensión/elevaeión. Estos dominios de extensión/elevación se definen como bloques limitados por fallas donde se han registrado similares procesos extensionales y/o de elevación en un mismo estadio tectónico. Los dominios de extensión/elevación muestran la propagación areal de los procesos tectónicos a través del tiempo. Durante los tresprimeros estadios evolutivos, se produce una extensión gradual a partir de un dominio central hacia el noreste y posteriormente hacia en suroeste. En el estadio CretAcico latendencia de propagación se invierte. El flujo de caloren la base de la sucesióny la historia térmica del área, han sido reconstruidos empleando diferentes modelos de distribución del flujo de calor. La maduración térmica de la materia orgánica ha sido evaluada tentativamente, adoptando diferentes flujos de calor. Los resultados obtenidos se corresponden con los datos hasta ahora conocidos del área.

This work is a contribvítion to the project PB94-1219 funded by the CICYT.

Peer reviewed

Country
Spain
Keywords

551.7, Cordillera Ibérica, 2506.19 Estratigrafía, Rift / uplift realm, Subsidencia tectónica, Flujo de calor, Numerical simulation, Generación de hidrocarburos, Subsidence, Hydrocarhon generation, Simulación numérica, Geología estratigráfica, Rift/ uplift realm, Hydrocarbon generation, Iberian Ranges, Heat flow

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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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