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川西磷酸岩的特征,对阐明磷的沉积作用和磷块岩的成因,有一定的重要性。多年来,四川省地质局在该区作了大量的详细的勘查和研究。这里仅就我们的工作所及,讨论磷酸岩的一些沉积学问题。一、含磷岩系的岩性序列与岩相系列掌握含矿岩系本身在纵横两个方向上变化更替的规律,对沉积矿床的勘查是很重要的。这种变化规律,可以用岩性序列与岩相系列表示之。岩性序列是含矿岩系的各个岩类在纵剖面上转换的次序,反映它成生时期沉积盆地的地质、自然地理、物理、化学和生物等诸方面的状况及其在时间上的演化;而岩相系列则是含矿岩系的各个岩类及其组合在横向上的转换次序,反映上述诸方面状况在空间上的演变。
The characteristics of phosphate rock in western Sichuan have certain importance for elucidating the sedimentation of phosphorus and the genesis of phosphorite. Over the years, Sichuan Bureau of Geology in the area made a lot of detailed exploration and research. Here we discuss only some of the sedimentological problems of phosphate rocks as far as our work is concerned. First, the lithologic sequence and lithofacies series of phosphorus-bearing rock series It is very important for the prospecting of sedimentary deposits to master the regularity that the ore-bearing rock series change and change in both vertical and horizontal directions. This pattern of variation can be expressed in terms of lithologic sequences and lithofacies series. Lithologic sequence is the order of conversion of each rock type of ore-bearing rock series in the longitudinal section, reflecting the geologic, physical, physical, chemical and biological aspects of the sedimentary basin during its genesis and its evolution in time ; And the lithofacies series are the transversal order of each rock type and its combination of the ore-bearing rock series, reflecting the spatial evolution of the above aspects.