摘要
壳粒磷块岩被作为一种独立的重要类型划分出来。壳粒磷块岩的性质从极重要的方面揭示了海相磷块岩的本质特征。本文以生物成矿论为指导,研究了扬子地块晚震旦世陡山沱期磷块岩形成的古地理,并阐述了磷块岩成矿与富集规律。
As an independent phosphorite type the coated grain phosphorite has been diggerentiated for ten years and gradually become well known. It reveals the essential characteristics of the marine phosphorite from a very important aspect. The coated grain phosphorite occupies a special place in phosphorites,especiall the pay ore consists mainly of it. The basic characteristics of the coated grain phosphorite and set forth the biological and biochemical causes of formation,as well as minerogenetic pattern of phosphorite are discussedin ten aspects in the paper.
The section of industrial ore beds of the marine phosphorite from bottom to top is in the proper order: argillaceous striped phosphorite (1), argillaceous onyx (Ⅱ), dolomitic striped (Ⅲ), and compact block (Ⅳ), etc. Each ore of the natural types consists of three texture-type phosphorites from lower to upper,e. g. gel-phosphorite(A),cumularspharolith (B) and coated grain (C). More obvious the phosphorite sequence is the bigger and richer phosphorite ore occurs, however, but the more developmental the endofragmental phosphoriteis, thepoorer ore oppears. Under the guidance of the biominerogernetic theory we have drawn up the palaeographic map for the phosphorite formation in Doushantuo formation of Upper Sinian in Yangtze area and put forward a conception about the shelf background. The research indicates, the shelf background itself is the most prospective minerogenetic belt. Two main industrial ore beds in Doushantuo formation offer the regular overlaping migration as the direction of upwelling oceanic current ands sea current. Accoding to the regular pattern we can get the minerogenetic foecast to guide the prospecting of minerals.
出处
《矿物岩石》
CAS
CSCD
1992年第2期61-69,共9页
Mineralogy and Petrology
关键词
壳粒
磷块岩
成矿作用
成矿规律
coated grain
coated grain phosphorite
phosphorus microorganism
mineralization
minerogenetic regular pattern
