黔北下寒武统黑色岩系元素赋存状态及富集模式

通过对黔北下寒武统黑色岩系的地质和地球化学分析,结合前人研究成果,探讨了黑色岩系元素赋存状态及富集模式。黑色岩系富含有机质,粘土矿物成分高,Ni-Mo矿层以硫化物矿物为主,表明元素赋存状态主要为硫化物态、有机质结合态和粘土矿物吸附态等,但各个元素的赋存状态有所不同。黑色岩系多元素富集层是贵金属元素、稀土元素和其他微量元素的富集体,富集系数高。黑色岩系多元素的异常富集是古地理环境、构造运动、热液活动和缺氧事件的综合作用结果。

A Study on Occurrence Modes and Enrichment Patterns of Lower Cambrian Black Shale Series in Northern Guizhou Province, China

Based on the analysis of geological and geochemical characteristics,combining with former researches,this paper deals with occurrence modes and enrichment patterns of elements in Lower Cambrian black shale series in northern Guizhou Province,China.The black shale series are rich in organic matters and clay minerals,mainly with the sulfide in Ni-Mo ore bed,indicating that occurrence modes of elements are of sulfide,organic matter bound and clay mineral adsorption.Geochemical determination has revealed anomalies of noble metal elements,REE and other trace elements in multi-element-rich strata of black shale series,which have relatively higher contents than those in its overlying and underlying beds.And high contents of elements might be resulted from paleogeographical conditions,tectonic movement,marine hydrothermal movement and noxic events.