Determining the key conditions for the formation of metamorphic core complexes by geodynamic modeling and insights into the destruction of North China Craton
| Autor: | Kun Wang, Liang Zhao, Tianyu Zheng, Gang Lu, Jianfeng Yang |
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| Rok vydání: | 2016 |
| Předmět: |
geography
geography.geographical_feature_category 010504 meteorology & atmospheric sciences Deformation (mechanics) Metamorphic core complex Crust Pure shear 010502 geochemistry & geophysics 01 natural sciences Tilted block faulting Detachment fault Tectonics Craton General Earth and Planetary Sciences Petrology Geology Seismology 0105 earth and related environmental sciences |
| Zdroj: | Science China Earth Sciences. 59:1873-1884 |
| ISSN: | 1869-1897 1674-7313 |
| DOI: | 10.1007/s11430-015-5407-5 |
| Popis: | Metamorphic core complex (MCC) is characterized by the exhumation of lower crust over a large-scale detachment fault, providing natural records for tectonic extension. MCCs are widely identified in the North China Craton (NCC), which have been intensively studied on their structural and geological characteristics. Yet, the condition for the formation of MCCs and their link with NCC destruction are still in debate. In this study, we perform numerical simulations to investigate MCC formation under extension, with a focus on the effect of crustal rheologies. Results indicate that three end-member modes of deformation may occur: the metamorphic core complex mode, the detachment fault-uplifting mode and the pure shear mode. Weaker lower crust and stronger upper crust may promote the formation of MCC. In contrast, stronger lower crust (>1.3×1021 Pa s) may prohibit the exhumation of lower crust (detachment fault-uplifting mode), while weaker upper crust ( |
| Databáze: | OpenAIRE |
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