A new kinematic model for Iberia; further palaeomagnetic and isotopic age evidence

Storetvedt, K.M.; Mitchell, J. G.; Abranches, M.C.; Oftedahl, S.

doi:10.1016/0031-9201(90)90196-5

Cited by 23 publications

(15 citation statements)

References 38 publications

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“…In b poles corresponding to directions 1-6 of a are shown in relation to the Upper Cretaceous-Tertiary APW curve for continental Africa and Meso-Caenozoic poles (circles) from the Cape Verde and Canary Islands (Storetvedt et al 1979;Storetvedt 1980;Storetvedt and Løvlie 1983;Abranches et al 1990). See text and Storetvedt et al (1990) for discussion The combined palaeomagnetic and isotopic age studies of alkaline intrusions in Portugal (Storetvedt et al 1987 gave some unexpected results. The data are displayed in Fig.…”

Section: Palaeomagnetic and Tectonic Frameworkmentioning

confidence: 85%

“…According to relevant large-scale tectonic conclusions summarized previously, the relative rotation between Africa and Europe, with the Pyrenean belt acting as a primary tectonic boundary, apparently did not terminate before late Eocene (cf. Storetvedt et al 1990). However, by the end of the Cretaceous the Pyrenean alkaline rocks had already been subjected to intermittent remagnetization processes for approximately 20-30 m.y., so by the Lower Tertiary the magnetomineralogical state of these rocks is likely to have been much more stable chemically, and therefore less susceptible to remagnetization agents, than they had been before.…”

Section: The Tectonomagnetic Issuementioning

confidence: 93%

“…For more detailed palaeomagnetic and geological discussion, the reader is referred to Storetvedt (1990) and Storetvedt et al (1990). The kinematic history of Iberia, independent of its parental African block, is depicted in Fig.…”

Section: Palaeomagnetic and Tectonic Frameworkmentioning

confidence: 99%

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Alpine remagnetization and tectonic rotations in the French Pyrenees

Storetvedt

Márton

Abranches

et al. 1999

Geologische Rundschau

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A palaeomagnetic study of the 100 to 90 m.y. old alkaline igneous rocks of the French Pyrenees has in part revealed large between-site scatter caused by highly variable declination. Magnetomineralogical evidence suggests that the original titano-magnetite has undergone variable low-temperature oxidation through martitization and maghemitization processes, suggesting that the rocks have been remagnetized. When viewed in the context of the Upper Cretaceous-Lower Tertiary inclination pattern based on Portuguese palaeomagnetic data, it is concluded that the rocks most likely acquired their present magnetization during early Campanian-Maastrichtian time, i.e. 20-30 m.y. after their original cooling. On the other hand, this magnetization postdates a major phase of late Cretaceous compressive deformation. Subsequent strike-slip movement along the Pyrenean zone in the Lower Tertiary led to variable rotation of cover units along the orogenic belt, producing the inconsistent palaeomagnetic declination picture presently observed. It is concluded that the geological history of the alkaline rocks of the French Pyrenees, from the magmatic stage to the subsequent events of remagnetization and tectonic deformation, is strongly associated with the Alpine-age rotational instability of Iberia. The principal kinematic history of the Peninsula comprised ca. 40°counterclockwise rotation (relative to Europe) during Cenomanian-Turonian time (100-90 m.y. ago) followed by ca. 70°clockwise rotation in the early Campanian (ca. 75 m.y. ago).

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Section: Palaeomagnetic and Tectonic Frameworkmentioning

confidence: 85%

Section: The Tectonomagnetic Issuementioning

confidence: 93%

See 1 more Smart Citation

Alpine remagnetization and tectonic rotations in the French Pyrenees

Storetvedt

Márton

Abranches

et al. 1999

Geologische Rundschau

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“…Results from igneous rocks seemed to suggest complicated rotations, both in the CCW and CW sense, before Iberia became eventually attached to Europe (Storetvedt et al, 1987(Storetvedt et al, , 1990. Paleomagnetic data from Jurassic-Cretaceous sediments (Galdeano et al, 1989;Moreau et al, 1997) indicated only CCW rotations during the Cretaceous.…”

Section: Introductionmentioning

confidence: 91%

“…In addition, important igneous activity is known during Turonian-Eocene (Lisbon volcanics) in the Lusitanian basin, and there are intrusions of moderate sizes in Algarve, the "Salema intrusions" (petrological affinity connects them to the Monchique complex) which cut Triassic and Jurassic sediments. Radiometric data for the massifs are also available, which are Rb-Sr whole rock isochron, Rb-Sr model, and K/Ar ages (Bonhomme et al, 1961;Mendes, 1968;Canilho, 1971;Rock, 1976;Abranches and Canilho, 1981;Canilho and Abranches, 1982;MacIntyre and Berger, 1982;Storetvedt et al, 1987;Storetvedt et al, 1990). For the Lisbon basalts the last two (Ferreira and Macedo, 1979;Alves et al, 1980), for the Salema intrusions, only the last (Storetvedt et al, 1990) method was used.…”

Section: Geological Frameworkmentioning

confidence: 98%

Iberia in the Cretaceous: new paleomagnetic results from Portugal

Márton¹,

Abranches²,

Pais³

2004

Journal of Geodynamics

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Assessing discrepancies between previous plate kinematic models of Mesozoic Iberia and their constraints

2016

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Currently, there are several published end-member plate models that describe the evolution of Iberia during the Mesozoic. We review key geological and geophysical data sets previously used as constraints on these models including (1) geological interpretations of Pyrenean geology; (2) end-member interpretations of magnetic anomalies along the West Iberian and Newfoundland margins and Bay of Biscay;(3) the paleomagnetic data set of Iberia; and (4) seismic tomography models, which have previously been used to support Cretaceous subduction between Iberia and Eurasia. From this review we identify key constraints and argue that a reasonable plate kinematic model of Iberia should satisfy all of these. Instead, we determine inconsistencies between these key constraints and several published end-member plate models through a kinematic analysis using the GPlates software. We also analyze published seismic tomography models, not previously considered, across northern Africa and Iberia, and identify no slab preserved within the mantle supposedly linked to Cretaceous subduction between Iberia and Eurasia. A lack of published geological evidence along the Pyrenees supporting this subduction history also casts doubt on this scenario. Our kinematic analysis highlights that, first, the cessation in transtensional motion between Iberia and Eurasia by the Albian cannot be kinematically reconciled with the concurrent breakup between Iberia and Newfoundland in the Atlantic when reconstructing existing continent-ocean boundary interpretations along their respective margins. Second, either fit of the contentious end-member M 0 interpretations (~120.6 Ma) between Iberia and Newfoundland implies plate velocities of Iberia that results in its undocumented transpressional or compressional motion relative to Eurasia until C 34 .

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A new kinematic model for Iberia; further palaeomagnetic and isotopic age evidence

Cited by 23 publications

References 38 publications

Alpine remagnetization and tectonic rotations in the French Pyrenees

Alpine remagnetization and tectonic rotations in the French Pyrenees

Iberia in the Cretaceous: new paleomagnetic results from Portugal

Assessing discrepancies between previous plate kinematic models of Mesozoic Iberia and their constraints

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