| Autor: |
Suhail, H. A., Nie, Q. H., Zhang, X. Q., Akbar, A., Aliyeva, G. |
| Předmět: |
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| Zdroj: |
Geotectonics; Aug2023, Vol. 57 Issue 4, p460-470, 11p |
| Abstrakt: |
The better understanding of the initial rifting would complement the knowledge of continental breakup and the oceanic opening process. Traditionally, mechanisms controlling the initial rifting have been divided into two schools of end-member models, magma-rich vs magma-poor rifting and pure-shear vs simple shear rifting. However, the linkage between these two schools has been rarely addressed. In our study, extension magnitude and ratio obtained from the balanced cross-sections were applied in magma-poor and magma-rich segments in South Atlantic margins to establish the possible linkage, as classic pure-shear and simple-shear models predict different extension magnitudes and ratios. Two pairs of structural sections Campos basin‒Kwanza basin from the central segment and Pelotas basin‒Walvis basin from the south segment, the southern segment temporally and spatially related to the (Paraná‒Etendeka Large Igneous Province) were subjected to balanced cross-section analysis to determine the extension magnitudes and ratios at the initial rifting stage predating finally opening of South Atlantic Ocean. Comparing the results in the South Atlantic margins with those obtained in classic shear models may suggest the magma-rich segment would return a larger extension ratio and possibly prefer to pure-shear rifting. Results of this study might build a likely linkage between the magma-rich and pure-shear mechanisms during the initial rifting of the oceanic opening process. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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