Provenance and sedimentary facies of the Dainan Formation in the Lianmengzhuang region, Gaoyou depression, northern Jiangsu

The present paper focuses, in terms of the synthetic analysis of clastic rocks and heavy minerals, on the provenance analysis of the Dainan Formation in the Lianmengzhuang region, Gaoyou depression, northern Jiangsu. The sediment sources are derived from the Zheduo low uplift in the northern part during the early and middle stages, and then from the Lingtangqiao low uplift in the northwestern part during the late stage of the deposition of the Dainan Formation. The sediments in the Formation belong to the recycled deposits. Tectonically, the parent rock provinces are believed to be located on the active continental margins. The source rocks primarily consist of granites and intermediately basic igneous rocks. The sedimentary facies analysis of the Dainan Formation in the Lianmengzhuang region is made on the basis of cores, electric logs, well logs and laboratory analysis. Influenced by the fluviolacustrine processes, the deltas tend to be aligned as flowers, lobes and elongated forms in individual stages.