从暗色沉积型硅质岩的形成环境看有机成矿

ON ORGANIC ORIGIN OF ORE DEPOSIT IN VIEW OF THE SEDIMENTARY ENVIRONMENT OF DARK SILICEOUS ROCKS OF SEDIMENTARY TYPE

李道琪

Li Daoqi

地质矿产部华东石油地质局

Petroleum Geology Bureau of East China, Ministry of Geology and Minerals

在以扬子地台为代表的中国南方震旦纪和古生代地层中,有多层暗色沉积型硅质岩。它包括硅质层、燧石层、硅质碳质页岩,有时还伴有硅质灰岩、硅质白云岩、硅质锰质碳质页岩及灰质硅质页岩。它们在上震旦统陡山沱组(兰田组)皮园村组(灯影组);下寒武统荷圹组(幕府山组);上奥陶统五峰组;下二叠统栖霞组、孤峰组(茅口组);上二叠统大隆组等都有发育。

It is proposed in this paper that the sedimentary dark siliceous rock is of enclosed gulf facies or lagoon facies according to the characteristics of rocks,minerals and paleontology.This denies the possibility of regarding them as of swamp or deep sea facies.Dark siliceous rock is essentially a kind of biological skeleton boundstone.This kind of rock serves not only as favourable source rock and reservoir but also as favourable bed for metal to be enriched there to form various kinds of ore deposit.Further study on the formational condition of this kind of rock, its sedimentary environment and changes in the landscape can be of much help in reconstructing the global tectonic of both the past and the present.

https://doi.org/10.11781/sysydz198402142