Quantitative modelling of basin and rheological evolution of the Iberian Basin (central Spain): Implications for lithospheric dynamics of intraplate extension and inversion

J D vanWees, R A Stephenson, Randell Stephenson

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Abstract

Subsidence analysis of Mesozoic sediments in the central part of the Iberian Basin in Central Spain demonstrates that basin evolution was related to three stages of lithospheric stretching, each followed by thermal subsidence. The rifting history was followed by Tertiary inversion. The three extensional phases correlate with rifting stages identified in other parts of the Iberian Basin, on the Betic, Lusitanian and Cantabrian margins of Iberia, and with regional extensional tectonics. The first phase (245-157 Ma), marked by rapid tectonic subsidence in Triassic-Early Jurassic times, yields a lithospheric stretching factor of about 1.10. The second, Oxfordian to earliest Albian (157-112 Ma) in age, is characterised by uplift followed by moderate subsidence. The amount of uplift and subsidence during these phases varies significantly within the basin. The uplift implies subcrustal lithospheric stretching factors ranging from 1.06 to 1.28 assuming a thermal uplift mechanism. The subsequent subsidence corresponds to lithospheric stretching factors in the range from 1.00 to 1.06. The third main phase (95-85 Ma), seen as a Cenomanian-early Senonian acceleration of tectonic subsidence, is modelled with lithospheric stretching factors of about 1.02.

The subsidence models are used to reconstruct the paleo-rheological evolution of the area during the Mesozoic, and indicate progressive strengthening of the lithosphere from west to east in the studied area during the Late Jurassic and Cretaceous. For the second phase of rifting and onset of Tertiary basin inversion, strength distributions are not in agreement with localised basin deformation. As an explanation, it is shown that late Variscan faults may have contributed considerably to lithospheric weakening and localisation of extension and inversion.

Original languageEnglish
Pages (from-to)163-178
Number of pages16
JournalTectonophysics
Volume252
Issue number1-4
Publication statusPublished - 30 Dec 1995

Keywords

  • CRITICAL STRESS DIFFERENCE
  • CONTINENTAL LITHOSPHERE
  • STRATIGRAPHIC EVOLUTION
  • SUBSIDENCE CURVES
  • SE SPAIN
  • MARGIN
  • CONSTRAINTS
  • STRENGTH
  • FAULTS
  • ROCKS

Cite this

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title = "Quantitative modelling of basin and rheological evolution of the Iberian Basin (central Spain): Implications for lithospheric dynamics of intraplate extension and inversion",
abstract = "Subsidence analysis of Mesozoic sediments in the central part of the Iberian Basin in Central Spain demonstrates that basin evolution was related to three stages of lithospheric stretching, each followed by thermal subsidence. The rifting history was followed by Tertiary inversion. The three extensional phases correlate with rifting stages identified in other parts of the Iberian Basin, on the Betic, Lusitanian and Cantabrian margins of Iberia, and with regional extensional tectonics. The first phase (245-157 Ma), marked by rapid tectonic subsidence in Triassic-Early Jurassic times, yields a lithospheric stretching factor of about 1.10. The second, Oxfordian to earliest Albian (157-112 Ma) in age, is characterised by uplift followed by moderate subsidence. The amount of uplift and subsidence during these phases varies significantly within the basin. The uplift implies subcrustal lithospheric stretching factors ranging from 1.06 to 1.28 assuming a thermal uplift mechanism. The subsequent subsidence corresponds to lithospheric stretching factors in the range from 1.00 to 1.06. The third main phase (95-85 Ma), seen as a Cenomanian-early Senonian acceleration of tectonic subsidence, is modelled with lithospheric stretching factors of about 1.02.The subsidence models are used to reconstruct the paleo-rheological evolution of the area during the Mesozoic, and indicate progressive strengthening of the lithosphere from west to east in the studied area during the Late Jurassic and Cretaceous. For the second phase of rifting and onset of Tertiary basin inversion, strength distributions are not in agreement with localised basin deformation. As an explanation, it is shown that late Variscan faults may have contributed considerably to lithospheric weakening and localisation of extension and inversion.",
keywords = "CRITICAL STRESS DIFFERENCE, CONTINENTAL LITHOSPHERE, STRATIGRAPHIC EVOLUTION, SUBSIDENCE CURVES, SE SPAIN, MARGIN, CONSTRAINTS, STRENGTH, FAULTS, ROCKS",
author = "vanWees, {J D} and Stephenson, {R A} and Randell Stephenson",
year = "1995",
month = "12",
day = "30",
language = "English",
volume = "252",
pages = "163--178",
journal = "Tectonophysics",
issn = "0040-1951",
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TY - JOUR

T1 - Quantitative modelling of basin and rheological evolution of the Iberian Basin (central Spain): Implications for lithospheric dynamics of intraplate extension and inversion

AU - vanWees, J D

AU - Stephenson, R A

AU - Stephenson, Randell

PY - 1995/12/30

Y1 - 1995/12/30

N2 - Subsidence analysis of Mesozoic sediments in the central part of the Iberian Basin in Central Spain demonstrates that basin evolution was related to three stages of lithospheric stretching, each followed by thermal subsidence. The rifting history was followed by Tertiary inversion. The three extensional phases correlate with rifting stages identified in other parts of the Iberian Basin, on the Betic, Lusitanian and Cantabrian margins of Iberia, and with regional extensional tectonics. The first phase (245-157 Ma), marked by rapid tectonic subsidence in Triassic-Early Jurassic times, yields a lithospheric stretching factor of about 1.10. The second, Oxfordian to earliest Albian (157-112 Ma) in age, is characterised by uplift followed by moderate subsidence. The amount of uplift and subsidence during these phases varies significantly within the basin. The uplift implies subcrustal lithospheric stretching factors ranging from 1.06 to 1.28 assuming a thermal uplift mechanism. The subsequent subsidence corresponds to lithospheric stretching factors in the range from 1.00 to 1.06. The third main phase (95-85 Ma), seen as a Cenomanian-early Senonian acceleration of tectonic subsidence, is modelled with lithospheric stretching factors of about 1.02.The subsidence models are used to reconstruct the paleo-rheological evolution of the area during the Mesozoic, and indicate progressive strengthening of the lithosphere from west to east in the studied area during the Late Jurassic and Cretaceous. For the second phase of rifting and onset of Tertiary basin inversion, strength distributions are not in agreement with localised basin deformation. As an explanation, it is shown that late Variscan faults may have contributed considerably to lithospheric weakening and localisation of extension and inversion.

AB - Subsidence analysis of Mesozoic sediments in the central part of the Iberian Basin in Central Spain demonstrates that basin evolution was related to three stages of lithospheric stretching, each followed by thermal subsidence. The rifting history was followed by Tertiary inversion. The three extensional phases correlate with rifting stages identified in other parts of the Iberian Basin, on the Betic, Lusitanian and Cantabrian margins of Iberia, and with regional extensional tectonics. The first phase (245-157 Ma), marked by rapid tectonic subsidence in Triassic-Early Jurassic times, yields a lithospheric stretching factor of about 1.10. The second, Oxfordian to earliest Albian (157-112 Ma) in age, is characterised by uplift followed by moderate subsidence. The amount of uplift and subsidence during these phases varies significantly within the basin. The uplift implies subcrustal lithospheric stretching factors ranging from 1.06 to 1.28 assuming a thermal uplift mechanism. The subsequent subsidence corresponds to lithospheric stretching factors in the range from 1.00 to 1.06. The third main phase (95-85 Ma), seen as a Cenomanian-early Senonian acceleration of tectonic subsidence, is modelled with lithospheric stretching factors of about 1.02.The subsidence models are used to reconstruct the paleo-rheological evolution of the area during the Mesozoic, and indicate progressive strengthening of the lithosphere from west to east in the studied area during the Late Jurassic and Cretaceous. For the second phase of rifting and onset of Tertiary basin inversion, strength distributions are not in agreement with localised basin deformation. As an explanation, it is shown that late Variscan faults may have contributed considerably to lithospheric weakening and localisation of extension and inversion.

KW - CRITICAL STRESS DIFFERENCE

KW - CONTINENTAL LITHOSPHERE

KW - STRATIGRAPHIC EVOLUTION

KW - SUBSIDENCE CURVES

KW - SE SPAIN

KW - MARGIN

KW - CONSTRAINTS

KW - STRENGTH

KW - FAULTS

KW - ROCKS

M3 - Article

VL - 252

SP - 163

EP - 178

JO - Tectonophysics

JF - Tectonophysics

SN - 0040-1951

IS - 1-4

ER -