摘要
从区域成矿条件、矿床地质特征、围岩蚀变及蚀变岩石的元素含量研究入手,对大官厂矿床围岩蚀变与矿化的关系进行了论述。研究表明,矿区围岩蚀变始终伴随成矿作用的每个阶段。蚀变类型具有多样性,但蚀变分带不明显,矿前期为面型蚀变,呈碱交代(以钾长石化为主)特征;成矿期呈线型蚀变(强赤铁矿化-弱赤铁矿化-水云母化)叠加于面型蚀变之上;矿后期多为脉状分布于早期已蚀变的岩石裂隙中,呈酸性蚀变组合(以水云母化为主)。通过对该矿床围岩蚀变类型、叠加关系的研究,据此对矿床的成因类型进行探讨。
The relationship between wall-rock alteration and mineralization are introduced based on regional metallogenetic condition,geological characteristics of deposit,wall-rock alteration and elements content of altered rocks.Results show wall-rock alteration is always associated with each steps of mineralization.The types of alteration present diversity with unobvious zoning.The earlier stage of ore-formation presents surface alteration with alkali metasomatism,and linear alteration（strong hematitizatoin-weak hematitizatoin-damouritization） overlap surface during the period of mineralization,late stage with dike distribution in altered rock fracture in earlier stage and acid altered combination.The genetic types of deposit are discussed based on wall-rock alteration and overlying relationship.
出处
《东华理工大学学报（自然科学版）》
CAS
2012年第1期30-37,共8页
Journal of East China University of Technology(Natural Science)
基金
天津华北地质勘查局地质勘查项目"河北省沽源县大官厂地区铀成矿作用研究"(20101002)
关键词
铀钼矿床
围岩蚀变
流纹斑岩
大官厂
uranium-molybdate deposit
wall-rock alteration
rhyolite porphyry
Daguanchang
