科研之友
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摘要
The Baikal Rift and the Fenwei Graben are two famous rift systems located in the eastern Eurasian plate, with similar topographic features and geomorphic characteristics. Their tectonic evolution histories are also similar. Many studies have shown that their formation is closely related to the Indo-Eurasian collision, however, the mechanism for this long-range effect is not clear. In this paper, basing on the evolution of extensional tectonics caused by mantle upwelling in the continental margin during the continental drift and continental margin splitting, combined with the Cenozoic tectonic evolution of Eurasia, we studied the evolution of microcontinental fragments and extensional tectonics under the long-range effect. The results show that the origin of the two rift systems is closely related to the Cenozoic large-scale fragmentation and drift of microcontinents in the eastern margin of the Eurasian. Briefly, the Qinghai-Tibet Plateau uplift results in large-scale mantle upwelling and continental breakup in the Cenozoic, where the breakup and drift of the proto-Japan/proto-Kamchatka blocks form a differential sinistral strike-slip environment, and lead to the formation of the two rift systems in two seismic zones on the southeast side of the Siberian and Ordos Basins. These two seismic zones, which have similar genetic mechanisms to the Türkiye earthquake in February 2023, are formed by strike slip faults, and their genetic mechanisms can be reasonably explained by the new continent drift model.
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