Late Permian paleomagnetic results from the Lodève, Le Luc, and Bas-Argens Basins (southern France): Magnetostratigraphy and geomagnetic field morphology

Evans, Michael; Павлов, В. Е.; Veselovsky, R.V.; Fetisova, A. M.

doi:10.1016/j.pepi.2014.09.002

Cited by 16 publications

(10 citation statements)

References 20 publications

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“…It is remarkable to note that the differences between the TDP poles and the paleomagnetic means calculated with the GAD formula are statistically indistinguishable. This illustrates the accurateness of both paleomagnetic determinations and plate tectonic reconstructions in the context of a dominantly geocentric, axial, and dipolar geomagnetic field, further supporting previous analyses of the Upper Paleozoic geodynamo [e.g., Bazhenov and Shatsillo , ; Evans et al ., ].…”

Section: Discussion and Reconstructionsmentioning

confidence: 99%

“…The angular difference between the TDPs and the paleomagnetic means calculated using the GAD formula illustrates the accuracy of paleomagnetic determinations in the context of a dominantly GAD geomagnetic field, further supporting previous analyses of the upper Paleozoic geodynamo [e.g., Bazhenov and Shatsillo , ; Evans et al ., ]. As a consequence, the Upper Paleozoic paleomagnetic database provides an accurate record of the paleolatitudes using the GAD field model.…”

Section: Discussionmentioning

confidence: 99%

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A pure dipole analysis of the Gondwana apparent polar wander path: Paleogeographic implications in the evolution of Pangea

Gallo

Tomezzoli

Cristallini

2017

Geochem Geophys Geosyst

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The paleogeography of prebreakup Pangea at the beginning of the Atlantic Spreading has been a subject of debate for the past 50 years. Reconciling this debate involves theoretical corrections that cast doubt on available data and paleomagnetism as an effective tool for performing paleoreconstructions. This 50 year old debate focuses specifically on magnetic remanence and its ability to correctly record the inclination of the paleomagnetic field. In this paper, a selection of paleopoles was made to find the great circles containing the paleomagnetic pole and the respective sampling site. The true dipole pole (TDP) was then calculated by intersecting these great circles, effectively avoiding nondipolar contributions and inclination shallowing, in an innovative method. The great circle distance between each of these TDPs and the paleomagnetic means show the accuracy of paleomagnetic determinations in the context of a dominantly geocentric, axial, and dipolar geomagnetic field. The TDPs calculated allowed a bootstrap analysis to be performed to further consider the flattening factor that should be applied to the sedimentary‐derived paleopoles. It is argued that the application of a single theoretical correction factor for clastic sedimentary‐derived records could lead to a bias in the paleolatitude calculation and therefore to incorrect paleogeographic reconstructions. The unbiased APWP makes it necessary to slide Laurentia to the west in relation to Gondwana in a B‐type Pangea during the Upper Carboniferous, later evolving, during the Early Permian, to reach the final A‐type Pangea configuration of the Upper Permian.

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Section: Discussion and Reconstructionsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

A pure dipole analysis of the Gondwana apparent polar wander path: Paleogeographic implications in the evolution of Pangea

Gallo

Tomezzoli

Cristallini

2017

Geochem Geophys Geosyst

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“…However, two red Middle Permian palaeofloras of similar ages are known, from the Bau Rouge Member (Kungarian–Roadian2223, Toulon Basin, Var), and the Mérifons Member (Kungurian–Capitanian2324, Salagou Formation, Lodève Basin, Hérault), at ∼150 and 350 km from the Dome de Barrot. All these outcrops are corresponding to shallow playa lakes and submerged flood plains25.…”

Section: Discussionmentioning

confidence: 99%

Insect mimicry of plants dates back to the Permian

et al. 2016

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In response to predation pressure, some insects have developed spectacular plant mimicry strategies (homomorphy), involving important changes in their morphology. The fossil record of plant mimicry provides clues to the importance of predation pressure in the deep past. Surprisingly, to date, the oldest confirmed records of insect leaf mimicry are Mesozoic. Here we document a crucial step in the story of adaptive responses to predation by describing a leaf-mimicking katydid from the Middle Permian. Our morphometric analysis demonstrates that leaf-mimicking wings of katydids can be morphologically characterized in a non-arbitrary manner and shows that the new genus and species Permotettigonia gallica developed a mimicking pattern of forewings very similar to those of the modern leaf-like katydids. Our finding suggests that predation pressure was already high enough during the Permian to favour investment in leaf mimicry.

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“…New magnetostratigraphic data show that the upper part of the Salagou Formation extends through the Capitanian‐Wuchiapingian transition ( ca . 260 Ma; Evans et al ., ). These strata are well correlated to other European Permo‐Carboniferous basins (e.g.…”

Section: Introductionmentioning

confidence: 97%

Permian exhumation of the Montagne Noire core complex recorded in the Graissessac‐Lodève Basin, France

et al. 2016

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The paleogeographic reconstruction of the Variscan Mountains during late Carboniferous-Permian post-orogenic extension remains poorly understood, owing to the subsequent erosion and/or burial of most associated sedimentary basins during the Mesozoic. The Graissessac-Lod eve Basin (southern France) preserves a thick and exceptionally complete record of continental sedimentation spanning late Carboniferous through late Permian time. This section records the localized tectonic and paleogeographic evolution of southern France in the context of the low-latitude Variscan Belt of Western Europe. This study presents new detrital zircon and framework mineralogy data that address the provenance of siliciclastic strata exposed in the basin. The ages and compositions of units that constitute the Montagne Noire metamorphic core complex (west of the basin) dictate the detrital zircon age populations and sandstone compositions in Permian strata, recording rapid exhumation and unroofing of the Montagne Noire dome. Cambrian-Archean zircons and metamorphic lithic-rich compositions record derivation from recycled detritus of the earliest Paleozoic sedimentary cover and Neoproterozoic-early Cambrian metasedimentary Schistes X, which formerly covered the Montagne Noire dome. Ordovician zircons and subarkosic framework compositions indicate erosion of orthogneiss units that formed a large part of the dome. The youngest zircon population (320-285 Ma) reflects derivation from late Carboniferous-early Permian granite units in the axial zone of the Montagne Noire. This population appears first in the early Permian, persists throughout the Permian section and is accompanied by sandstone compositions dominated by feldspar, polycrystalline quartz and metamorphic lithic fragments. The most recent migmatization, magmatism and deformation occurred ca. 298 AE 2 Ma, at ca. 17 km depth (based on peak metamorphic conditions). Accordingly, these new provenance data, together with zircon fission-track thermochronology, demonstrate that exhumation of the Montagne Noire core complex was rapid (1-17 mm year À1 ) and early (300-285 Ma), reflecting deep-seated uplift in the southern Massif Central during postorogenic extension.

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Late Permian paleomagnetic results from the Lodève, Le Luc, and Bas-Argens Basins (southern France): Magnetostratigraphy and geomagnetic field morphology

Cited by 16 publications

References 20 publications

A pure dipole analysis of the Gondwana apparent polar wander path: Paleogeographic implications in the evolution of Pangea

A pure dipole analysis of the Gondwana apparent polar wander path: Paleogeographic implications in the evolution of Pangea

Insect mimicry of plants dates back to the Permian

Permian exhumation of the Montagne Noire core complex recorded in the Graissessac‐Lodève Basin, France

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