摘要
水沟钒矿床产于南秦岭下寒武统水沟口组的黑色岩系中,该黑色岩系为一套碳—硅—泥岩建造,形成于早寒武世扬子陆块北部的被动大陆边缘。钒矿体呈层状产出,与地层产状一致,含矿岩石主要为硅质岩夹炭质泥岩。通过对岩性组合与钒含量的对比分析,发现钒含量与含矿岩石中炭质泥岩出现的频率呈正相关;对较富的钒矿石进行X衍射测试,钒主要赋存于炭质泥岩中的钒云母中。通过对钒矿石的主量元素、微量元素、稀土元素及氧同位素特征研究,表明水沟钒矿床形成于大陆边缘与深海环境过渡带上的缺氧沉积环境中,其沉积物源来自海底热水及近陆源剥蚀的混合区,生物活动对于成矿物质的聚集、沉淀具有重要作用。综合地质、地球化学特征,认为该矿床属于生物-热水沉积成因。
The Shuigou vanadium deposit occurs in the black rock series of Lower Cambrian Shuigoukou Formation in southern Qinling.The black rock series is a suit of carbon-silicon-mudstone formation,formed in the passive continental margin of northern Yangtze Plate during the Early Cambrian.This vanadium ore body is controlled by the strata of black rock series.The ore-hosted rocks are silicalite intercalated with carbargillite.Via comparing lithologic association with vanadium content,it is concluded that the vanadium content is positive correlation with the frequency of carbargillite occurrence in ore-bearing rocks.Testing the rich vanadium ore in X-ray diffraction,vanadium mainly occurs in the roscoelite in the carbargillite.The characteristics of major elements,trace elements,REE and oxygen isotopes of vanadium ore indicate that Shuigou vanadium deposit formed in the anoxic sedimentary environment in the intermediate zone between continental margin and deep-sea,the sediment come from the mixed zone between the submarine hydrothermal spring and the land-source area,biological activities have an important effect on the conglomeration and precipitation of the ore-forming materials.It is concluded that the vanadium deposit should be of biological and hydrothermal sedimentary origin.
出处
《现代地质》
CAS
CSCD
北大核心
2012年第2期243-253,共11页
Geoscience
基金
陕西省国土资源厅项目(6100000410516
6100000520527)
关键词
南秦岭
黑色岩系
钒矿床
地球化学特征
生物-热水沉积
southern Qinling
black rock series
vanadium deposit
geochemical characteristics
biological and hydrothermal sediment
