Abstract
Based on the coupling control between the tectonic evolution and sedimentary characteristics, the tectonic evolution and sedimentary characteristics of Cenozoic rift basins in western southeast Asia are investigated by the contrast between basins. First, with the example of Malay basin, the tectonic evolution rule of each basin is compared, the result shows that although there are some differences existed, but more common points showed among the tectonic evolution rule of each basin, they can all divided into three stages, rift period, depression period and compressional inversion period, and the only difference is the corresponding time of each stage. With the further use of core and log data, the sedimentary characteristics of Malay basin has been interpreted, the results suggest that the main sedimentary facies in the Cenozoic Malay basin are alluvial-alluvial fan facies, delta facies and coastal facies. In the Oligocene epoch, the main facies in Malay basin is alluvial-alluvial fan deposit and braided stream-delta deposit; in the early Miocene epoch, the main facies in Malay basin is braided stream-shallow water delta facies; after the middle Miocene epoch, the main facies in Malay basin is coastal facies, coastal plain facies and shallow sea facies. At last, with the comparison of the sedimentary characteristics of each basin, a conclusion is settled that the distribution of sedimentary facies of each basin is controlled by the tectonic evolution, there are some obvious differences in the distribution of sedimentary facies of each tectonic evolution stage. In the rift period, the distribution of sedimentary facies is mainly alluvial-alluvial fan facies and alluvial-braided stream-delta facies accompanied with the fault and half graben; in the depression period, the sedimentary characteristics is following the typical sedimentation model of braided stream-shallow water delta of depression basin.KeywordsTectonic evolutionSedimentary characteristicsRift BasinSoutheast Asia
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