河北省沙河市白涧铁矿床稀土元素地球化学特征

河北省沙河市白涧铁矿床稀土元素地球化学特征

郝俊杰;莘建宏;赵新卫;冯东东

【期刊名称】《现代地质》 【年(卷),期】2011(025)003

【摘要】通过对河北省沙河市白涧铁矿床稀土元素的研究,判定矽卡岩、矿石与地层(灰岩)具有类似的稀土元素特征,矿石与岩浆岩(闪长岩)也有着密切的关系.矽卡岩、矿石的稀土元素分布模式表现出了承袭围岩的分布模式,造成这一现象的原因可能是由于含矿岩浆形成后经过了较长距离的运移,需要经过断裂等通道到达现在的沉淀位置,并与围岩发生接触交代作用,而在交代过程中,热液萃取了大量地层的成矿物质所造成.矽卡岩、矿石均呈现较强的Eu负异常和较弱的Ce异常,表明它们是由一种低温、Eu强烈富集的岩浆流体在还原环境下形成的.osed on the study of REE geochemistry of Baijian iron deposit in Shahe, Hebei Province, REE in skarns , ores and strata limestone have the similar characteristics, and ores are closely related to magmatic rocks ( diorites) . REE pattern of ores show the same distribution pattern of limestones of wallrocks. A probable reason of the phenomenon is infered that ore-forming fluids or magma experienced long distance transportation after forming, went through structures such as faults to the deposition place , and then acted metasomatism with wallrocks, and that during metasomatism, ore-forming fluids extracted ore-forming matenals from wallrocks. The skams and ores have similar chondrite-normalized REE distribution patterns and are