摘要
庐枞盆地是长江中下游成矿带重要的矿集区之一,盆地内发育众多铁矿床(点)。本文以玢岩型铁矿和沉积-热液叠改型铁矿为研究对象,在前人大量研究成果的基础上,通过野外地质调查和钻探等工作,对含矿建造构造特征进行了综合研究。结果表明:玢岩型铁矿的含矿建造包括粗安岩-凝灰岩建造、与膏辉岩化有关的变质建造和闪长玢岩建造;沉积-热液叠加改造型铁矿的含矿建造包括灰岩建造或钙质粉砂岩建造及粗安斑岩建造,与矽卡岩化有关的变质建造和正长岩建造关系密切;铁矿化与基底断裂、基底隆起带和岩侵型穹窿息息相关。初步认为庐枞火山岩盆地铁矿成矿作用可划分为沉积作用成矿期和岩浆热液成矿期。
The Lujiang- Zongyang volcanic basin in Anhui province is one of the important ore concentration regions in the Middle-Lower Yangtze metallogenic belt, where there are many iron deposits(points). The authors chose porphyrite iron deposit and sedimentary hydrothermal-transformation iron deposit in the basin to study. On the basis of the collection and secondary development on the number of previous studies data and achievements of exploration projects, throngh field geological investigation and drilling exploration, and identify characteristics of ore- bearing formation- tectonic. It is suggested that the ore bearing formation of porphyrite iron deposit includes trachyandesites- tuff formation, anhydrite- pyroxene alteration metamorphic formation and diorite porphyrite formation. And the ore bearing formation of sedimentary hydrothermal- transformation iron deposit includes limestone or calcareous siltstone formation, skarnized metamorphic formation and syenite formation.The iron mineralization was associated with basement fault, basement uplift and volcanic dome. On the combination of metallogenic regularity, and the mineralization of iron deposits in the Lujiang-Zongyang volcanic basin can be divided into sedimentation period and magma hydrothermal metallogeny period.
作者
杜玉雕
魏国辉
DU Yu-diao;WEI Guo-hui(Geological Survey of Anhui Province, Hefei 230001, China)
出处
《地质调查与研究》
2018年第4期270-279,共10页
Geological Survey and Research
基金
国家地质调查项目"安徽庐江矾山-枞阳周潭地区深部找矿靶区验证与评价(12120114012701)"
关键词
庐枞盆地
铁矿床
含矿建造
构造
成矿
Lujiang-Zongyang volcanic basin
iron deposit
ore bearing formation
tectonic
mineralization
