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subsidence Analysis and Burial History of the Late Carboniferous to Early Jurassic Soutpansberg basin,Limpopo Province,South Africa

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Acta Geologica Sinica(English Edition) 2016年第6期90卷 2000-2007页

作者： Ntokozo MALAZA LIU Ken ZHAO Baojin Department of Geology University of Fort Hare Worley Parsons 39 Melrose BoulevardMelrose Arch

The subsidence history of the Soutpansberg basin was reconstructed by a tectonic subsidence analysis coupled with backstripping calculations based on data of newly interpreted sequence boundaries. Furthermore, burial and time plots were constructed in order to understand the burial and thermal history of the basin. Input data were based on facies, lithostratigraphic models and tectonic interpretations. The studied succession is up to 1000 m and is underlain by the Achaean Limpopo Mobile Belt. The subsidence within the basin supports the primary graben system which must have been centred within the present basins, and later became a region of faulting. The subsidence and burial history curves suggests two phases of rapid subsidence during the Early-Late Permian （300–230 Ma） and Middle Triassic （215–230 Ma）. The areas of greater extension subsided more rapidly during these intervals. Two slow subsidence phases are observed during the Late Triassic （215–198 Ma） and Early Jurassic （198–100 Ma）. These intervals represent the post-rift thermal subsidence and are interpreted as slow flexural subsidence. Based on these observations on the subsidence curves, it is possible to infer that the first stage of positive inflexion （300 Ma） is therefore recognised as the first stage of the Soutpansberg basin formation.

关键词： basin subsidence Karoo Supergroup Soutpansberg basin Permian-Jurassic

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A Global Perspective on Crustal Structure and Evolution based on A New Crustal Classification

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Acta Geologica Sinica(English Edition) 2021年第S1期95卷 48-50页

作者： Irina M.ARTEMIEVA Alexey SHULGIN School of Earth Sciences China University of GeosciencesWuhan 430074China Marine Geodynamics GEOMAR Helmholtz Center for Ocean ResearchKielGermany Department of Geophysics Stanford UniversityCAUSA CEED University of OsloNorway

Knowledge of the crustal structure is the key for understanding physical and chemical conditions of its formation and later modification by geodynamic *** has long been recognized that crustal structure is controlled by tectonic settings,and that the crustal thickness is one of the most important parameters that reflects the geodynamic origin of the crust.A long tectonic life of continental crust leads to its significant reworking by plate tectonics processes and crust-mantle interaction,which include mechanical extension.

关键词： crustal delamination granitization basin subsidence orogenic processes continental rifting hotspots continental shelves failed oceans oceanic crust

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