Provenance of Lower Cretaceous Clastic Rocks in Suibin Depression Heilongjiang Province and Its Tectonic Significance

Key words: 
• geochemistry /
• tectonic setting /
• provenance analysis /
• Suibin depression /
• Heilongjiang province

Abstract: Lower Cretaceous of Suibin depression includes Didao , Chengzihe, Muleng and Dongshan Formations.The geochemical compositions of sandstones and mudstones in Suibin depression, Sanjiang basin reveal the tectonic settings in the different epochs. Didao Formation mainly represents active continental margin but the rocks of Chengzihe and Muleng indicate the transition from continental island to active continental margin. Dongshan Formation expresses active continental margin. Combined with ancient direction of waterflow, the characteristic of the facies of sedimentary rocks and lithic fragments, it is referred that the provenance of Didao Formation located in the south of the Suibin depression and the provenance of Chengzihe , Muling and Dongshan Formations in the southeast of the Suibin depression. The primary materials of sedimentary rocks should come from the upper crust. This provides strong geochemical evidence for realizing the evolution of basins of eastern Heilongjian province correctly.