Guizhou Province ranks third in China in terms of identified phosphate resources, and ranks first about its high-grade phosphate resources. Currently, it hosts the largest phosphate chemical base in Asia. Comparative studies on the Early Sinian phosphate-bearing rock series in central Guizhou Province aim to enhance the understanding of the Qianzhong ancient land or Qianzhong uplift, which are of significant importance for the prediction and exploration of deep phosphate resources. This work took the phosphate-bearing rock series profile of the Dawan phosphate deposit in the Wengfu area of Guizhou as a comparative standard. Through the re-examination of the lithological section of the phosphorite series, the phosphorite layers and phosphorites, the well-developed phosphate-bearing rock series of the Dawan phosphate deposit was divided into two lithological sections and six lithological layers. Vertical and horizontal profile analyses and comparisons were conducted to summarize their characteristics and variations, thereby analyzing the sedimentary environment and facies around the Qianzhong ancient land or Qianzhong uplift. It is suggested that the sedimentary base of the phosphate-bearing rock series is uneven, with greater deposition thickness in depressed areas and erosion or depositional gaps in raised areas. The Qianzhong ancient land covers a small area, with shallow water platform sediments of the Yangshui Formation around and within the ancient land, and deeper water slope sediments of the Doushantuo Formation further away from the ancient land. The Early Sinian sedimentary environment around the ancient land varies greatly, suggesting a multi-island uplift. Within the range of the multi-island uplift, there are favorable geological conditions for mineralization, indicative of a good potential for deep phosphate resource exploration.

phosphate-bearing rock series  /  phosphate ore layer  /  phosphorite  /  multi-island uplift  /  Qianzhong ancient land  /  Qianzhong uplift