黔中寒武系底部磷块岩沉积特征
[Abstract]:The phosphorous-bearing formation, dominated by bioclastic phosphorite, developed at the bottom of the Cambrian system in Zhijin-Qingzhen area, Guizhou Province, and is famous for its rich rare earth elements at home and abroad. Through the sedimentological study of more than 10 sections of phosphate-bearing rocks in central Guizhou, it is found that they have complex sedimentary structures, including breccia, bioclastic, lenticular, interbedded and interlaced phosphate blocks, and that they have complex sedimentary structures, including breccia, bioclastic, lenticular and interbedded phosphorite. Strip-banded phosphate block rock, striate phosphor rock, etc. The results of sedimentary facies analysis show that the Qingzhen area is in the subtidal low-energy environment, and the sedimentary strip-banded phosphate rocks are the main ones. Zhijin Maobao Chong to Gaozhongwu area is intertidal-subtidal high-energy tidal channel environment, sedimentary breccia phosphate rock is the main. Zhijin Xiongjiachang to Xishui big rock line, located in the sedimentary environment of the supra-tidal zone, the area between Jinshui Yatang and Nayong is post-tidal olake low-energy environment, sedimentary dolomite and phosphorous dolomite are the main. It is believed that the phosphorus-rich ocean current flows into the Jinge Zhongwu-Xinglian area along the tidal channel along the Maobechong area, and a large amount of phosphorus is deposited in the barrier post-bay to form phosphate rock. The sedimentary center of phosphate rock is located in Zhijingo Zhongwu-Xinglian area. The main phosphorus-forming environment is intertidal-subtidal high energy environment. Based on the analysis of regional sedimentary characteristics of phosphate-bearing rock series, the palaeogeography of phosphorus-forming period was restored, the P2O5 contours were compiled, and the phosphorus-rich areas were delineated, and the controlling factors of phosphorus formation were analyzed.
【作者单位】: 贵州大学资源与环境工程学院;
【基金】:贵州省国土厅基础性、公益性研究项目(编号:2012294)
【分类号】:P619.213
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