Dynamics of intracontinental extension in the north Baikal rift from two‐dimensional numerical deformation modeling

Lesne, Olivia; Calais, E.; Déverchère, Jacques; Chéry, Jean; Hassani, Riad

doi:10.1029/2000jb900139

Cited by 34 publications

(27 citation statements)

References 58 publications

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“…Such an effect would also reinforce the difference in lithospheric structure between the stable Ordos Block and the surrounding areas [40,71]. In fact, similar localized lithospheric modification and thinning and sharp contrasts in lithospheric structure between cratonic nucleus and surrounding mobile belts have also been widely documented in other cratonic regions, such as South Africa [74], Europe [75], Siberia [76], East Africa [77] and North America [78,79]. The role of weak tectonic belts acting to protect cratons and to control the location of deformation has also been confirmed by numerical simulations [80], and is considered as an important factor for the long-term stability of cratons.…”

Section: Mechanism Of the Ncc Destructionmentioning

confidence: 85%

Timing, scale and mechanism of the destruction of the North China Craton

Zhu

Chen

et al. 2011

Sci. China Earth Sci.

611

364

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The North China Craton (NCC) is a classical example of ancient destroyed cratons. Since the initiation of the North China Craton Destruction Project by the National Natural Science Foundation of China, numerous studies have been conducted on the timing, scale, and mechanism of this destruction through combined interdisciplinary research. Available data suggest that the destruction occurred mainly in the eastern NCC, whereas the western NCC was only locally modified. The sedimentation, magmatic activities and structural deformation after cratonization at ~1.8 Ga indicate that the NCC destruction took place in the Mesozoic with a peak age of ca 125 Ma. A global comparison suggests that most cratons on Earth are not destroyed, although they have commonly experienced lithospheric thinning; destruction is likely to occur only when the craton has been disturbed by oceanic subduction. The destruction of the NCC was coincident with globally active plate tectonics and high mantle temperatures during the Cretaceous. The subducted Pacific slab destabilized mantle convection beneath the eastern NCC, which resulted in cratonic destruction in the eastern NCC. Delamination and/or thermal-mechanical-chemical erosion resulted from the destabilization of mantle convection. timing, scale and mechanism, craton destruction, North China Craton Citation:Zhu R X, Chen L, Wu F Y, et al. Timing, scale and mechanism of the destruction

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Section: Mechanism Of the Ncc Destructionmentioning

confidence: 85%

Timing, scale and mechanism of the destruction of the North China Craton

Zhu

Chen

et al. 2011

Sci. China Earth Sci.

611

364

View full text Add to dashboard Cite

show abstract

“…It is thus difficult to truthfully interpret this pattern from density model only. Nevertheless, it is worth noting that this anomaly is close to the oldest basin in Lake Baikal and at the junction of the lake to the Barguzin rift valley (Figure 1), a major rift bifurcation [ Lesne et al , 2000, and references therein]. Furthermore, its location corresponds to a potential crustal thinning, according to Petit et al [1997].…”

Section: Discussionmentioning

confidence: 96%

Deep structure of the Baikal rift zone revealed by joint inversion of gravity and seismology

et al. 2003

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[1] The question of plate boundary forces and deep versus shallow asthenospheric uplift has long been debated in intracontinental rift areas, particularly in the Baikal rift zone, Asia, which is colder than other continental rifts. As previous gravity and teleseismic studies support the dominance of opposing mechanisms in the Baikal rift, we reconsidered both data sets and jointly inverted them. This more effective approach brings insight into location of the perturbing bodies related to the extension in this region. Our new joint inversion method allows for inverting the velocity-density relationship with independent model parametrization. We obtain velocity and density models that consistently show (1) crustal heterogeneities that coincide with the main tectonic features at the surface, (2) a faster and denser cratonic mantle NW of Lake Baikal that we relate to the thermal contrast between old and depleted Archean (Siberian platform) and Paleozoic orogenic belt (Sayan-Baikal belt), (3) three-dimensional topographic variations of the crust-mantle boundary with well-located upwarpings, and (4) the lithosphere-asthenosphere boundary uplift up to 70 km depth with a NW dip. Our resulting velocity and density models support the idea of a combined influence of lithospheric extension and inherited lithospheric heterogeneities for the origin of the Baikal rift zone.INDEX TERMS: 1234 Geodesy and Gravity: Regional and global gravity anomalies and Earth structure; 7218 Seismology: Lithosphere and upper mantle; 8122 Tectonophysics: Dynamics, gravity and tectonics; 8180 Tectonophysics: Evolution of the Earth: Tomography; KEYWORDS: joint inversion, gravity, seismology, intracontinental rift, lithospheric structures, Baikal rift zone Citation: Tiberi, C., M. Diament, J. Déverchère, C. Petit-Mariani, V. Mikhailov, S. Tikhotsky, and U. Achauer, Deep structure of the Baikal rift zone revealed by joint inversion of gravity and seismology,

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“…On peut néanmoins noter que des soulèvements supérieurs à 1 000 m ont été enregistrés jusqu'à plus de 300 km de la marge des rifts relativement jeunes de la mer Rouge, de la Chaîne Transantarctique et du lac Baïkal (Van der Beek et al, 1994 ;Lesne et al, 2000). de l'exhumation de la surface infra-ordovicienne dans ce secteur de la péninsule du Labrador ( fig.…”

Section: Discussionunclassified

Calcul de l’érosion à long terme en région de socle autour de grands astroblèmes du Québec et de France

Degeai¹,

Peulvast

2007

gpq

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Une nouvelle méthode de calcul de l’érosion à long terme est proposée à partir des caractéristiques morphométriques des cratères d’impact complexes. Cette méthode permet d’estimer l’épaisseur de la tranche de substrat érodé autour d’un astroblème, forme dégradée d’un cratère d’impact. Pour cela, la morphométrie initiale du cratère est reconstituée afin d’estimer l’altitude de la topographie pré-impactique. Deux paramètres morphométriques sont retenus : le diamètre de la structure d’impact et sa profondeur réelle, c’est-à-dire la distance entre la topographie pré-impactique et la base des brèches d’impact polymictiques. Une relation entre ces deux paramètres a été déterminée à partir d’une base de données portant sur 31 cratères d’impact complexes terrestres bien conservés. Cette méthode est appliquée à quatre grands astroblèmes, d’âge dévonien à triasique, situés au Québec (Charlevoix, Manicouagan, lac à l’Eau Claire est) et dans l’ouest du Massif central français (Rochechouart). Les tranches de substrat érodé autour de ces astroblèmes depuis leur formation sont estimées entre 100 et 2 000 m d’épaisseur. Les taux moyens d’érosion post-impactique sont relativement faibles, avec des valeurs comprises entre 1 et 10 m/Ma. Au Québec, l’érosion à long terme au cours des temps phanérozoïques semble avoir été 2 à 4 fois plus forte sur la bordure du Bouclier canadien (Laurentides) qu’à l’intérieur (Labrador).Morphometric characteristics of complex impact craters are used in order to develop a new calculation method of long-term erosion. This one is based on an assessment of the eroded bedrock thickness around an astrobleme, a morphologically degraded impact crater. First, the initial crater morphometry is reconstructed, in order to determine the elevation of the pre-impact surface. Two morphometric parameters are used : the diameter of the impact structure and its true depth, i.e. the height difference between the pre-impact surface and the bottom of the polymictic impact breccias. A relationship between both parameters was established from a database of 31 morphologically well-preserved terrestrial complex impact craters. This calculation method was applied to four Devonian to Triassic large astroblemes located in Québec (Charlevoix, Manicouagan, Clear Water Lake) and the western French Massif Central (Rochechouart). Bedrock thicknesses eroded around these astroblemes since their formation are evaluated between 100 and 2 000 m. Post-impact mean erosion rates are relatively low, with values ranging from 1 to 10 m/Ma. In Québec, the long-term erosion on the southeastern edge of the Canadian Shield (Laurentides) during the Phanerozoic times seems have been from 2 to 4 times higher than the one in the interior (Labrador)

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Dynamics of intracontinental extension in the north Baikal rift from two‐dimensional numerical deformation modeling

Cited by 34 publications

References 58 publications

Timing, scale and mechanism of the destruction of the North China Craton

Timing, scale and mechanism of the destruction of the North China Craton

Deep structure of the Baikal rift zone revealed by joint inversion of gravity and seismology

Calcul de l’érosion à long terme en région de socle autour de grands astroblèmes du Québec et de France

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