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Tanan Depression is a Cretaceous sub-basin in the Tamtsag Basin of eastern Mongolia. The early Cretaceous strata contain three second-order sequences and six third-order sequences deposited during the syn-rift phase. The primary target for petroleum exploration in the Lower Cretaceous Nantun Formation is a sublacustrine fan system deposited in a deep-water setting during the rift-climax stage corresponding...
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