【摘要】 <正> 含磷建造系指含有磷块岩的沉积建造。中国东部晚震旦—下寒武世发育有分布广泛而又有工业意义的含磷建造带。深入研究这一时期的含磷建造对阐明古老磷块岩形成机理和大地构造背景,以及磷矿远景预测工作都具有重要意义。更多还原

【Abstract】 According to the threefold meaning of rock-paragenesis suggested by the author and based on the material source .environment and energy equilibrium, the phosphatic formation in the eastern part of China 560-700 Ma has been divided into mono-terrestrial formation, tele-siliceous formation and silice ous shale formation,all belonging to stable type, substable type and unstable type formations, respectively.The giant phosphorus-rich accumulation zone belonging to the characteristic of tele-siliceous formation possesses the combined model of CF+SF+MF+OF with lower value Q （ 49% ）.In the phosphate-rich constituent Na is higher than K,with lower TiO₂,and Al₂O₃.In respect to the relationship between the alternating sequence of sedimentary formations and the spatial distribution,it belongs to the component part of the volcanic-siliceous formation and possesses the characteristics of marginal basin connected with back arc basin.The sources of the elements P, F, I, V,Ni,Mo,Co,Cu ,U and Y are related to the oceanic volcanic action.The phosphorus-rich accumulation zone of tele-siliceous formation includes four models; chemical deposition （ M-Ⅰ ）,algal deposition （ M-Ⅱ ） ,hydrodynamic deposition （ M-Ⅲ ） and gravity gliding superimposition （ M-Ⅳ ） .The writer has analysed the special conditions of tectonics and paleogeog-raphy for the formation of phosphorus-rich deposit by using paleogeographic mapping, comparative sedimentology and comparative sedimentary formational, geology.The paleogeographic settings are the margins of small-scale land-mass, insufficient import of terrigenous fragments and the characteristics of clean-water basin. And the sedimentary framework is that the deep-water depression alternates with shallow-sea platform under the effect of the back are basin. The depressions between platforms are favourable for the import of phosphorus-rich materials from the deep sea, and the clean shallow-sea platform is favourable for the phosphorus accumulations of chemical, algal and hydrodynamic depositions. The gravity gliding superimposition can only occur in the said sedimentary formation.更多还原