陕西山阳县黑色岩系中中村—银花钒矿床地质特征

Characteristics of the Zhongcun-Yinhua vanadium deposit in black rock series,Shanyang County,Shaanxi Province

秦岭黑色岩系中带的钒矿构成超大型规模,中村—银花钒矿是大型钒矿的典型代表,产于下寒武统水沟口组中段硅质板岩-泥板岩-粘土质泥板岩岩性转换过渡层位中。矿石根据岩性划分为硅板岩型、粘土质泥板岩型和硅质泥板岩型3种类型。矿层延长及厚度稳定,V2O5品位为0.70%～1.17%。研究查明,钒与粘土质、泥质板岩密切相关,钒在粘土泥板岩中相对富集。钒与铝、钾、铁存在较密切的地球化学共生关系。钒以钒酸盐、磷酸盐及吸附状态存在于高岭石、水云母中。研究认为,含钒黑色岩系是扬子大陆向华北大陆俯冲启动下,于早寒武世扬子大陆北缘斜坡出现在拉伸裂谷式沉积环境,发育滞留深水环境下的炭-泥-灰-重晶石-硅质含钒沉积建造,含钒的炭质硅板岩-炭质泥板岩层具有热水沉积产物的特征。

The Zhongcun-Yinhua superlarge vanadium deposit is a typical sedimentary vanadium deposit in the mesozone black rock series of Qinling region. The deposit occurs on the lithologic transitional horizon of siliceous slate-argillite-clayey argiUite in Lower Cambrian Shueigoukou Formation. The vanadium ores are of three types,namely siliceous slate type,clayey argiUite type and siliceous-argillite type. Strike extension and thickness of the ore bed are stable, and the V2O5 content of the ores is 0.70%-1.17%. Vanadium is closely related to clayey and politic slate and is relatively abundant in clayey argillite. There exists close geochemical paragenetic relationship between vanadium and aluminum, potassium and iron. Vanadium occurs in kaolinite and hydromica in the forms of phosphate, vanadate and adsorption. Studies have revealed that the vanadium-bearing black rock series was formed in a sedimentary environment of rift zone on the marginal continental slope of North Yangtze Plate in Lower Cambrian under the action of Yangtze Continent-North China Continent underthrust convergence. In the stagnant deep-water sedimentary environment there developed vanadium-bearing sedimentary formation of anthrinoid - lime -mud-barite-siliceous rock. Therefore, the vanadium- bearing sedimentary formation has the genetic characteristic of hot spring exhalative-sedimentary deposition.