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Lin Ding - One of the best experts on this subject based on the ideXlab platform.
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The Ancestral Lhasa River: A Late Cretaceous trans-arc river that drained the proto–Tibetan PLateau
Geology, 2019Co-Authors: Andrew K. Laskowski, Devon A. Orme, Fulong Cai, Lin DingAbstract:Abstract Late Cretaceous trench basin strata were deposited in the subduction zone that consumed Neo-Tethyan oceanic lithosphere along the southern margin of the proto–Tibetan PLateau. We conducted detrital zircon (DZ) U-Pb geochronology on six trench basin samples (n = 1716) collected near Dênggar, Tibet (∼500 km west of Lhasa), to assess the provenance of these rocks and reconstruct Late Cretaceous sediment transport pathways. They contained DZ ages that point to a unique source around Lhasa city, north of the Late Cretaceous Gangdese magmatic arc. The modern Lhasa River catchment contains the requisite sources, and its main trunk transects the Gangdese magmatic arc, joining with the Yarlung River at a barbed junction at the India-Asia suture. We infer that the Lhasa River is an ancient feature that transported sediment to the subduction zone in Late Cretaceous time and persisted during India-Asia collision.
Trond H Torsvik - One of the best experts on this subject based on the ideXlab platform.
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Late Cretaceous India–Madagascar fit and timing of break‐up reLated magmatism
Terra Nova, 2000Co-Authors: Trond H Torsvik, Lewis D Ashwal, Robert D. Tucker, L.m. Carter, Bjørn Jamtveit, K.t. Vidyadharan, P. VenkataramanaAbstract:A U–Pb zircon age of 91.2 ± 0.2 Myr from western India (St. Mary islands) confidently links India with the Late Cretaceous magmatic province in Madagascar (≈ 84–92 Ma), and the U–Pb age is within analytical error of the U–Pb age of the Analalava gabbro pluton (91.6 ± 0.3 Myr) in northeastern Madagascar. Palaeomagnetic data from India and Madagascar allow us to postuLate a new India–Madagascar fit (Euler latitude = 14.24°, longitude = 38.8° and rotation angle = –69.2°). This fit is applicable to the Late Cretaceous, directly prior to and during the early phase of Madagascar–India separation. In our Late Cretaceous reconstruction, south-west India runs roughly subparallel with the first known break-up reLated magnetic anomaly (A34); it maintains a close connection between Mada-gascar and India, but places India slightly rotated compared to the eastern margin of Madagascar and more northerly compared with some reconstructions. St. Mary magmatism is linked to the initial break-up between India and Madagascar, and magmatism probably resulted from rift-reLated extensional processes initially induced by the Marion hotspot underlying southern Madagascar during the Late Cretaceous.
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Late Cretaceous magmatism in Madagascar: Palaeomagnetic evidence for a stationary Marion hotspot
Earth and Planetary Science Letters, 1998Co-Authors: Trond H Torsvik, E. A. Eide, N. A. Rakotosolofo, R D Tucker, Lewis D Ashwal, M. J. De WitAbstract:Late Cretaceous basalic volcanics in the Morondava Basin (SW Madagascar) possess high-quality and pre-fold palaeomagnetic data (declination 353.5°, inclination -54.8°, α95 = 2.4°). The palaeomagnetic data are all of normal magnetic polarity, and remanence acquisition is linked to the terminal stages of the Cretaceous Normal Superchron (≥83 Ma). This is sustained by an 40Ar/39Ar age of 83.6 ± 1.6 Ma from one of the tested basaltic flows. A precise U/Pb zircon-baddeleyite age from northeast Madagascar demonstrates magmatism at least back to 91.6 ± 0.3 Ma; thus reliable isotope ages for the Madagascar Cretaceous igneous province span a range of 8 million years. Late Cretaceous palaeomagnetic data obtained from volcanics and dolerites all over Madagascar are directionally concordant, and the combined palaeomagnetic pole (latitude 68.5°N, longitude 230.3°E, A95 = 5.5°, N = 8 studies; sampling age range ca. 84-90 Ma) represents one of the best Late Cretaceous poles for the former Gondwanan elements. The collective palaeomagnetic data yield a palaeolatitude of 45.3°S-4.7+5.3 for the proposed focal point of the Marion plume (Volcan de l'Androy, southeast Madagascar) during the Late Cretaceous. This is in perfect agreement with hotspot-controlled reconstructions that place the Marion hotspot (46.0°S) beneath southeast Madagascar during the Late Creataceous. Setting true polar wander aside, hotspot movements in the Indian Ocean do not appear to exceed ca. 0.75 cm/yr, and the Marion hotspot appears stationary within the resolution power of palaeomagnetic data.
Dimitri Schreiber - One of the best experts on this subject based on the ideXlab platform.
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The Southeast France basin during Late Cretaceous times: The spatiotemporal link between Pyrenean collision and Alpine subduction,
Geodinamica Acta, 2012Co-Authors: Jean-marc Lardeaux, Gérard Giannerini, Dimitri SchreiberAbstract:We present and discuss the Late Cretaceous evolution of the Southeast France Basin (SEFB) owing to the Pyrenean and Alpine belts. The available geological data (isopachs maps, boreholes and field data) were integrated in 3D GeoModeller software to build a 3D model of the geometry of the Cenomanian to Campanian sedimentary series of the Late Cretaceous period. Maps, 3D block diagrams and cross-sections extracted from the 3D model reveal a significant eastward marine regression during the Late Cretaceous with an average velocity of 0.5 to 1 cm per year. According to the location of the Late Cretaceous depocenters, two sub-basins are recognized in the SEFB and correspond to "en-échelon" synclines filled by syn-buckling sediments. These events are reLated to the sub-meridian "Pyrenean-Provence" crustal shortening. During Campanian time, the deepening and the tilting of the SEFB are interpreted as a consequence of the subduction of the Alpine Tethys. The Late Cretaceous SEFB is the prolongation on the European foreland of the Alpine subduction trench.
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The Southeast France basin during Late Cretaceous times: The spatiotemporal link between Pyrenean collision and Alpine subduction
Geodinamica Acta, 2011Co-Authors: Dimitri Schreiber, Gérard Giannerini, Jean-marc LardeauxAbstract:We present and discuss the Late Cretaceous evolution of the Southeast France Basin (SEFB) owing to the Pyrenean and Alpine belts. The available geological data (isopachs maps, boreholes and field data) were integrated in 3D GeoModeller software to build a 3D model of the geometry of the Cenomanian to Campanian sedimentary series of the Late Cretaceous period. Maps, 3D block diagrams and cross-sections extracted from the 3D model reveal a significant eastward marine regression during the Late Cretaceous with an average velocity of 0.5 to 1 cm per year. According to the location of the Late Cretaceous depocenters, two sub-basins are recognized in the SEFB and correspond to “en-echelon” synclines filled by syn-buckling sediments. These events are reLated to the sub-meridian “Pyrenean-Provence” crustal shortening. During Campanian time, the deepening and the tilting of the SEFB are interpreted as a consequence of the subduction of the Alpine Tethys. The Late Cretaceous SEFB is the prolongation on the European...
Jean-marc Lardeaux - One of the best experts on this subject based on the ideXlab platform.
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The Southeast France basin during Late Cretaceous times: The spatiotemporal link between Pyrenean collision and Alpine subduction,
Geodinamica Acta, 2012Co-Authors: Jean-marc Lardeaux, Gérard Giannerini, Dimitri SchreiberAbstract:We present and discuss the Late Cretaceous evolution of the Southeast France Basin (SEFB) owing to the Pyrenean and Alpine belts. The available geological data (isopachs maps, boreholes and field data) were integrated in 3D GeoModeller software to build a 3D model of the geometry of the Cenomanian to Campanian sedimentary series of the Late Cretaceous period. Maps, 3D block diagrams and cross-sections extracted from the 3D model reveal a significant eastward marine regression during the Late Cretaceous with an average velocity of 0.5 to 1 cm per year. According to the location of the Late Cretaceous depocenters, two sub-basins are recognized in the SEFB and correspond to "en-échelon" synclines filled by syn-buckling sediments. These events are reLated to the sub-meridian "Pyrenean-Provence" crustal shortening. During Campanian time, the deepening and the tilting of the SEFB are interpreted as a consequence of the subduction of the Alpine Tethys. The Late Cretaceous SEFB is the prolongation on the European foreland of the Alpine subduction trench.
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The Southeast France basin during Late Cretaceous times: The spatiotemporal link between Pyrenean collision and Alpine subduction
Geodinamica Acta, 2011Co-Authors: Dimitri Schreiber, Gérard Giannerini, Jean-marc LardeauxAbstract:We present and discuss the Late Cretaceous evolution of the Southeast France Basin (SEFB) owing to the Pyrenean and Alpine belts. The available geological data (isopachs maps, boreholes and field data) were integrated in 3D GeoModeller software to build a 3D model of the geometry of the Cenomanian to Campanian sedimentary series of the Late Cretaceous period. Maps, 3D block diagrams and cross-sections extracted from the 3D model reveal a significant eastward marine regression during the Late Cretaceous with an average velocity of 0.5 to 1 cm per year. According to the location of the Late Cretaceous depocenters, two sub-basins are recognized in the SEFB and correspond to “en-echelon” synclines filled by syn-buckling sediments. These events are reLated to the sub-meridian “Pyrenean-Provence” crustal shortening. During Campanian time, the deepening and the tilting of the SEFB are interpreted as a consequence of the subduction of the Alpine Tethys. The Late Cretaceous SEFB is the prolongation on the European...
Andrew K. Laskowski - One of the best experts on this subject based on the ideXlab platform.
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The Ancestral Lhasa River: A Late Cretaceous trans-arc river that drained the proto–Tibetan PLateau
Geology, 2019Co-Authors: Andrew K. Laskowski, Devon A. Orme, Fulong Cai, Lin DingAbstract:Abstract Late Cretaceous trench basin strata were deposited in the subduction zone that consumed Neo-Tethyan oceanic lithosphere along the southern margin of the proto–Tibetan PLateau. We conducted detrital zircon (DZ) U-Pb geochronology on six trench basin samples (n = 1716) collected near Dênggar, Tibet (∼500 km west of Lhasa), to assess the provenance of these rocks and reconstruct Late Cretaceous sediment transport pathways. They contained DZ ages that point to a unique source around Lhasa city, north of the Late Cretaceous Gangdese magmatic arc. The modern Lhasa River catchment contains the requisite sources, and its main trunk transects the Gangdese magmatic arc, joining with the Yarlung River at a barbed junction at the India-Asia suture. We infer that the Lhasa River is an ancient feature that transported sediment to the subduction zone in Late Cretaceous time and persisted during India-Asia collision.