Provenance Change in the Lower Jurassic in Fukang Depression(Junggar Basin)and Its Response to the Uplift of the Bogda Mountains
[Objective]The Lower Jurassic Badaowan and Sangonghe Formations in the middle and eastern parts of the Fukang Depression are key intervals for oil and gas exploration,but they are restricted due to their unclear prove-nance.[Methods]In this study,the provenance was analyzed from rock clastic composition,paleocurrent analysis,heavy mineral composition,cathodoluminescence properties and the proportion of sandstone in the strata.[Results and Conclusions]The study area is dominated by the Karameri Mountain provenance during the Lower Jurassic,with limited Northern Tianshan and Bogda Mountains provenance.The Sangonghe Formation was influenced by prove-nances inherited from both the Kalameri Mountain and the northern Tianshan,enhanced by a superposed branch provenance from the Bogda Mountains.In the study area,which has a south-dipping structural background,it is clear that the provenance changed due to the increasing east-to-west uplift of the Bogda Mountains.This southeasterly Low-er Jurassic provenance is the scenario for stratigraphic-lithological traps to develop on the southern slope of the Fu-kang Depression.This may be greatly significant for future oil and gas exploration.
Fukang DepressionBogda MountainsLower Jurassicprovenance analysisdepositional systems
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