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...Hello Sichuan basin (large ellipse; the small ellipse is the study area). The 180 000 sq. km Sichuan basin is a composite foreland basin to the Longmenshan (i.e. the first rise to Tibet, in the northwest), the Qinling terrane of the North China block (to the northeast), and the Yangtze fold-and-thrust belt (to the southeast)
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