龙门山中段磷矿递进成矿规律及成矿序列探讨  

Discussion on the progressive mining rule and mining sequence in the middle section of Mountain Longmen

作　　者：贺天全 He Tianquan(Sichuan provincial institute of Chemical and geological exploration,Chengdu,Sichuan,611930,China)

机构地区：[1]四川省化工地质勘查院,四川成都611930

出　　处：《化工矿产地质》2022年第1期1-9,共9页Geology of Chemical Minerals

基　　金：中国地质调查局全国矿产资源评价项目“四川省矿产资源潜力评价”(1212010881629)。

摘　　要：龙门山中段产出有泥盆系沙窝子组的什邡式磷矿、寒武系筇竹寺组清平式磷矿、震旦系观音崖组陡梯子式磷矿,三类矿床处于同一大地构造位置,地质特征既有区别也有相同之处。本文通过对三类矿床地质特征、矿床成因分析,探讨地质特征异同的原因,建立磷矿成矿序列,认为三类矿床各自既有原生同沉积特征,又有继承前期矿产或含磷层作为矿物源的特征,继承前期矿产越多,矿床越丰富,具递进成矿富集规律。同时早期矿床成矿作用较单一,后期矿床具有多期成矿、叠加成矿特征。成矿序列为:海水磷质生物、化学沉积-机械搬运簸选早期成矿-风化剥蚀、表生淋滤-再次机械搬运-海进沉积再造。In the middle section of Mountain Longmen, there are Shifang-type phosphate mine of Shawozi group of Devonian System, Qingping-type phosphate mine of Qiongzhusi group of Cambrian system, and Duotizi-type phosphate mine of Guanyinya group of Sinian system. The three types of deposits are in the same earth tectonic position, and the geological characteristics are both different and identical. Through the analysis of geological characteristics and deposit genesis, we probe the cause of the difference and identity of geological characteristics,and establish the sequence of phosphate ore, it was thought that the three types of deposits have both origin syndepositional characteristics and inheritance characteristics of the preliminary mineral or phosphorite deposit as the mineral source. The more the early ore, the more rich the deposit, it shows progressive ore enrichment law.At the same time, the early deposit mining effect is relatively single, and the late deposit has the characteristics of multi-stage and superimposed mining. The mineralization sequence is: seawater phosphobiology, chemical deposition-mechanical transporting and winnowing-early mineralization-weathering and erosion, surface leaching-mechanical transporting again-sea deposition reconstruction.

关 键 词：龙门山中段磷矿 矿床地质特征 矿床成因 递进成矿 成矿序列 

分 类 号：P619.213[天文地球—矿床学]