Superimposed characteristics and tectonic evolution of Sichuan Basin
Abstract
The Sichuan Basin, located in the western part of the Yangtze Craton, has undergone multi-cycle tectonic evolution after the formation of the pre-Sinian basement. The nature of the tectonic dynamics and basin types in different geological periods has long been a controversy. Clarifying the basin types and superposition characteristics is important for studying the evolution of the sedimentary cover and oil and gas exploration in the Yangtze Craton. The tectonic-sedimentary evolution of the Sichuan Basin is analysed using drilling logs, field and regional geological data, regional seismic reflection profile transecting the northwest-southeast area of the Sichuan Basin.Based on the results, five regional unconformities in the basin and five structural layers in the sedimentary cover are identified. An analysis of the results indicates that the prototype basins were superimposed in the vertical direction in the following order(Fig.1): marine rift cratonic basin (Z-S), marine intra-craton sag basin (P1l-T2l), downfaulted basin (T3x1-T3x3), continental depressed basin (T3x4-J), and foreland basin (K-Q).
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFM.T51D0288Y
- Keywords:
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- 8011 Kinematics of crustal and mantle deformation;
- STRUCTURAL GEOLOGY;
- 8110 Continental tectonics: general;
- TECTONOPHYSICS;
- 8169 Sedimentary basin processes;
- TECTONOPHYSICS;
- 8175 Tectonics and landscape evolution;
- TECTONOPHYSICS