摘要
沉积相研究表明昆明坳陷南段早寒武世早期沉积为一海湾泻湖潮坪体系;进一步划分为浅滩、泻湖、近滨泻湖和潮坪等四个相区。原生菌藻磷块岩主要形成于泻湖相区;内碎屑磷块岩主要形成于浅滩相区。研究强调指出古构造及其演化控制了磷矿床的时空分布和次生富集。建立了磷块岩矿床多因素(生物、生物化学,物理机械和化学溶解、沉淀等)多阶段(同生沉积成矿、同生成岩成矿、表生淋积成矿)富集的成矿摸式。
Sedimentary facies study shows that in early Cambrian the southern part of the Kunming Depression was in a bay-lagoon-tidal flat environment. It can be further classified into four facies regions,i.e. shoal,lagoon-body,shore -lagoon and tidal flat. The primary algae-bacterial phosphorites mainly occur in lagoon facies,while the intraclastic phosphorites chiefly in shoal facies. Palaeotectonic evolution had controlled the distribution and secondary enrichment of the phosphorite in space and in time. The minerbgenetic model of phosphate deposits is characterized in multiple factors (biological,biochemical, physico-michamical, chemical dissolution and pricipitation) and multiple stages (synsedimentation, syndiagenesis, epidiagenesis and leaching).
出处
《矿物岩石》
CAS
CSCD
1989年第2期45-59,共15页
Mineralogy and Petrology
