Abstract
The rift-related depositional system developed in the divergent plate-margin basin where sedimentary heavy-minerals preserve a record of the tectonic elements. This paper presents how heavy-mineral assemblages and concentrations serve as rifting criteria in rift-related basin. From the Dragon-1 well samples, distinctive change of heavy-mineral assemblages could be used to distinguish different rifting stages and to subdivide a changing tectonic setting. Heavy-mineral concentrations are mainly controlled by the amount of heavy-mineral supply from source area and depositional slope angle in a half-graben.
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