The rotation of Iberia; Caenozoic palaeomagnetism from Portugal

Storetvedt, K.M.

doi:10.1016/0040-1951(73)90063-2

Cited by 19 publications

(16 citation statements)

References 23 publications

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“…The clay section may thus have acquired remanent magnetizations of depositional (DRM) and/or chemical (CRM) origin during the initial phase of submergence of the Iceland-Faeroe Ridge. A postulated shift of the geomagnetic field axis occurring in mid-Tertiary times (Storetvedt, 1972;L^vlie and Kvingedal, 1975), corresponding to steepening of the paleomagnetic inclination, from around 55° to 76° at the latitude concerned, would thus allow an independent determination of the time of submergence of the Iceland-Faeroe Ridge.…”

Section: History Of Ice Raftingmentioning

confidence: 99%

Sites 336 and 352

Talwani¹,

Udintsev²,

Bjorklund³

et al. 1976

Initial Reports of the Deep Sea Drilling Project

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Section: History Of Ice Raftingmentioning

confidence: 99%

Sites 336 and 352

Talwani¹,

Udintsev²,

Bjorklund³

et al. 1976

Initial Reports of the Deep Sea Drilling Project

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“…Later, this idea seemed compatible with palaeomagnetic data (e.g. Schwartz 1963;Van Dongen 1967;Van der Voo 1967Storetvedt 1973). Although a pole of rotation in the western Pyrenees would adequately account for the measured palaeomagnetic declination discordance between Europe and Iberia, there are important geological arguments against such a model (Mattauer 1969).…”

Section: Geological Settingmentioning

confidence: 85%

“…Argand 1924;Carey 1958;Bullard et al 1965;Matthews and Williams 1968;Van der Voo 1967Bacon and Gray 1970;Storetvedt 1972Storetvedt , 1973Choukroune et al 1973; Van den Berg 1980;Sibuet 1989) but the overall understanding of the structural development still remains speculative. It is accurate to say that exploration of plate tectonics has confused the issue rather than resolved it.…”

Section: Geological Settingmentioning

confidence: 95%

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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“…Until now the palaeomagnetic data are ambiguous whether the major amount of rotation occurred in late Jurassic-Cretaceous time before the late Eocene folding of the Pyrenees (VAN DER Voo • BOESSENKOOL, 1973) or after this event in late-or post-Eocene times (STORETVEDT, 1978). Until now the palaeomagnetic data are ambiguous whether the major amount of rotation occurred in late Jurassic-Cretaceous time before the late Eocene folding of the Pyrenees (VAN DER Voo • BOESSENKOOL, 1973) or after this event in late-or post-Eocene times (STORETVEDT, 1978).…”

Section: Rotating Mieroplates In the Mediterraneanmentioning

confidence: 99%

Intraplate tectonics in stable Europe as related to plate tectonics in the Alpine system

Illies

1975

Geol Rundsch

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ZusammenfassungWesteuropa ist von einem Schwarra k~,inozoiseher Griiben durehzogen. Die Stadien der Grabenbildung ereigneten sich gleichzeitig mit den Episoden verst~rkter Faltung in den Alpen. Das Aufreil3en des Rheingrabens wurde dureh einen Manteldiapirismus ausgelSst, die alpine Orogenese dagegen durch Subduktion yon Lithosphtire. Es wird angenommen, dab der Subduktionsvorgang im Alpenbereich den Mantelaufstieg im Vorland bedingt hat.Die mitteleoz~ine bis oligoz~ine Zerrungstektonik des Rheingrabens setzt eine Kompression parallel zur Grabenachse in ca. 20~voraus. Im selben Gebiet betr~igt die rezente Richtung maximaler Kompressionsspannung ca 820 ~ (NW), wie in situ stress-Messungen, Herdfl:,iehenlSsungen yon Erdbeben sowie rezente Krustenbewegungen erkennen lassen. Die sinistrale Rotation des Beansprnchungsplans relativ zur Kruste des stabilen Europa hat sich im Anschlul3 an eine entspreehende Rotation yon Mikroplatten im Mittelmeerraum vollzogen. Diese Rotationen werden alternierenden Scherbewegungen zugesehrieben, welche sich zwischen dem stabilen Europa und den Afro-Arabischen Platten im Laufe des K~inozoikums ereignet haben. Hierdurch wurden die zwischengelagerten Mikroplatten einem Kugellager-Effekt ausgesetzt. Die postulierten Scherbewegungen entsprechen der alternierenden Gesehwindigkeitsverteilung des ocean floor spreading beiderseits der afrikanischen Platte. Die Stadien alpiner Plattenkollision hatten entsprechende Umorientierungen des intraplate stress-Feldes in den kratonisierten Bereichen des mitteleurop~iischen Vorlandes im Gefolge. AbstractWestern Europe is traversed by the Rhinegraben rift system. The stages of graben formation evolved coineidentally with the culminations of compressional folding in the Alps, Rhinegraben rifting has been controlled by mantle diapirism, but the Alpine orogeny by subduction of lithosphere. Presumably, Alpine subduction forced compensating mantle uplift in the foreland.The Middle Eocene to Oligocene crustal spreading of the Rhinegraben implies a state of stress with a maximum horizontal component parallel to the graben axis (about 20~ In the same area, the Recent average direction of maximum compressive stress is of about 820 ~ (NW), as calculated by in-situ stress measurements, fault-plane solutions of earthquakes and Recent crustal movements. The rotation of the stress components relative to the ernst of stable Europo evolved subsequent to counterclockwise rotations of microplates in the Mediterranean. A model is proposed which ascribes these rotations to alterating shear motions of the Afro-Arabian macroplates relative to stable Europe exerting a ball-bearing effect to the intervenient microplates. The 05JIaCTH nMeeT HanpaBJieHHe npHMepHo 320 ~ r.e. ceBepo-3ana~Hoe, Kai~ BI~ITe-EaeT It3 n3MepeHHffI cTpeeea in situ, HCcJIe~0BaHH~ O~tal"OB 3aMJIaTpHCeHHI~ H CoBpeMeHHI~IX ~BHYEeHHI:I I~0pl, I. I][OBOpOT IIJIaHa HanpYl~eHHffI OTHOCHTeJIbHO Kop~I CTaSHJIbHO~ EBpOUbI BJIeBO np0H3Orn~JI O~HOBpeMeHHO C COOTBeTCTByI~II~HM HOBO-pOTOM cpe~(H3eMHoM0pCEOffI MHEpoFJI~I6bI...

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The rotation of Iberia; Caenozoic palaeomagnetism from Portugal

Cited by 19 publications

References 23 publications

Sites 336 and 352

Sites 336 and 352

Alpine remagnetization and tectonic rotations in the French Pyrenees

Intraplate tectonics in stable Europe as related to plate tectonics in the Alpine system

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