Geochemical Evidence for Diachronous Uplift and Synchronous Collapse of the High Elevation Variscan Hinterland

Hillenbrand, Ian; Williams, Michael L.

doi:10.1029/2022gl100435

Cited by 10 publications

(2 citation statements)

References 103 publications

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“…The Permo-Carboniferous Lorraine Basin (NE France) -21/28 these anticlines. The basin was mainly supplied by rivers draining the surrounding high-altitude massifs; at least 3 km above sea level (Hillenbrand and Williams, 2022). The eroded anticlines demonstrate that rock uplift was also generated at that time within the basin, the eroded material being recycled during syn-and early post-orogenic stages.…”

Section: Integration Of Seismic Data Into a New Regional Structural Mapmentioning

confidence: 97%

A deformed wedge-top basin inverted during the collapse of the Variscan belt: the Permo-Carboniferous Lorraine Basin (NE France)

Hemelsdaël¹,

Averbuch

Beccaletto

et al. 2023

Preprint

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<div> <div> <div> <p>A new structural model is presented for the Permo-Carboniferous Lorraine Basin (NE France), a major intramountain basin that developed during the latest stages of the Variscan orogeny (ca 315&#8211;270 Ma). This basin is buried in NE France below the Paris Basin but outcrops in southern Germany (Saar-Nahe Basin). Digitalized well logs and reprocessed seismic data were used to decipher the kinematic evolution of this basin located along the Rhenohercynian orogenic suture zone. The basin initiated during the late collision stage (Late Namurian-Westphalian) in a wedge- top position upon the Saxoth&#252;ringian retrowedge. The syn-orogenic sequences are delimited to the north by the major SE-directed Metz Thrust, which is part of the backthrust system that propagated during Late Westphalian times. Seismic data provide evidence of negative tectonic inversion, allowing the formation of syn-rift depocenters (Stephanian-Early Permian) above the former anticlines. Erosion of these anticlines results in a major unconformity (base of Stephanian) marking the onset of post-orogenic collapse stage. The late Early Permian shortening (Saalian phase) reactivated former thrusts and normal faults, thus generating uplift of the basin. The post- orogenic phase is complex and diachronous at basin scale, and both compression and extension can be recorded in the same area over a short period (<10 Ma). The Late Carboniferous negative tectonic inversion along the Rhenohercynian suture zone is proposed to result from the lithospheric delamination of the Variscan orogenic roots. The associated upwelling of asthenospheric material is recorded by intense magmatic activity, and can be, in turn, considered as the main trigger for the subsequent thermal subsidence of the Paris basin.</p> </div> </div> </div>

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Section: Integration Of Seismic Data Into a New Regional Structural Mapmentioning

confidence: 97%

A deformed wedge-top basin inverted during the collapse of the Variscan belt: the Permo-Carboniferous Lorraine Basin (NE France)

Hemelsdaël¹,

Averbuch

Beccaletto

et al. 2023

Preprint

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show abstract

“…During late Middle Pennsylvanian (stage b; Figure 10), deformation progressively migrated toward the SE, with development of intrabasinal folds and thrusts (e.g., Morhange thrust) as documented by growth strata in the forelimbs of these anticlines. The basin was mainly supplied by rivers draining the surrounding high‐altitude massifs; probably >3 km above sea level (Hillenbrand & Williams, 2022). The eroded anticlines demonstrate that rock uplift was also generated at that time within the basin, the eroded material being recycled during syn‐ and early post‐orogenic stages.…”

Section: A New Tectonic Model For the Lsnbmentioning

confidence: 99%

A Deformed Wedge‐Top Basin Inverted During the Collapse of the Variscan Belt: The Permo‐Carboniferous Lorraine Basin (NE France)

Hemelsdaël,

Averbuch,

Beccaletto

et al. 2023

Tectonics

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A new structural model is presented for the Permo‐Carboniferous Lorraine Basin (NE France), a major intramountain basin that developed during the latest stages of the Variscan orogeny (ca. 315–270 Ma). Digitalized well logs and reprocessed seismic data were used to decipher the kinematic evolution of this basin located along the Rhenohercynian orogenic suture zone. The basin was initiated during the late collision stage (Early to Middle Pennsylvanian) in a wedge‐top position upon the Saxothuringian retro‐wedge. The syn‐orogenic sequence is delimited to the north by the major SE‐verging Metz Thrust, which is part of the backthrust system that propagated during Middle Pennsylvanian (Late Westphalian). Seismic data provide evidence of negative tectonic inversion, allowing the formation of syn‐rift depocenters (Late Pennsylvanian‐Early Permian) above the former anticlines. Erosion of these anticlines results in a major unconformity marking the onset of post‐orogenic collapse. The late Early Permian shortening (Saalian phase) is suggested to reactivate former thrusts and normal faults, thus generating late uplift of the basin. The post‐orogenic phase is complex and diachronous at basin scale, and both compression and extension can be recorded in the same area over a short period (<10 Myr). The Late Carboniferous negative tectonic inversion along the Rhenohercynian suture zone is proposed to result from the lithospheric delamination of the Variscan orogenic roots. The associated upwelling of asthenospheric material is recorded by intense magmatic activity, and can be, in turn, considered as the main trigger for the subsequent thermal subsidence of the Mesozoic Paris Basin.

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Provenance of the Lower Jurassic pyroclastic sediments in the Zigui Basin: Implication for crustal thickening in the eastern Qinling orogenic belt

Chai,

Yang,

et al. 2023

Sci. China Earth Sci.

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Geochemical Evidence for Diachronous Uplift and Synchronous Collapse of the High Elevation Variscan Hinterland

Abstract: The late Paleozoic Variscan (Hercynian) orogen is a classic example of collisional tectonics associated with the amalgamation of Laurentia-Baltica and Gondwana during the final assembly of the supercontinent Pangea (Dewey

Cited by 10 publications

References 103 publications

A deformed wedge-top basin inverted during the collapse of the Variscan belt: the Permo-Carboniferous Lorraine Basin (NE France)

A deformed wedge-top basin inverted during the collapse of the Variscan belt: the Permo-Carboniferous Lorraine Basin (NE France)

A Deformed Wedge‐Top Basin Inverted During the Collapse of the Variscan Belt: The Permo‐Carboniferous Lorraine Basin (NE France)

Provenance of the Lower Jurassic pyroclastic sediments in the Zigui Basin: Implication for crustal thickening in the eastern Qinling orogenic belt

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