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传统方法不能明确揭示泥河铁矿床多阶段热液叠加蚀变过程中元素迁移的继承性特征.运用等浓度图法(the isocon diagram),根据该区晚阶段蚀变都是叠加在稍早阶段蚀变之上的实际情况,采用早期蚀变岩石为原岩与稍晚期蚀变岩石的不活动元素拟合最佳等浓度方程,定量揭示主量元素在热液蚀变过程的迁移规律.研究表明,泥河铁矿床阳离子的沉淀顺序大致为:Na→Ca、Mg、Fe、P→Ca、Fe→Al、Si.从早到晚,元素的带入和带出是连续互补的,蚀变矿化作用是一个连续的过程.钠长石的大量出现是Na质沉淀的标志,代表铁矿化的开始;膏辉岩化是Ca、Mg、Fe质沉淀的表现形式,为磁铁矿体的近矿和容矿蚀变;次生石英岩化、高岭石化是早期迁移出的Al、Si质沉淀的结果,是磁铁矿化远程指示性蚀变.
The traditional method can not clearly reveal the inherited characteristics of element migration during multi-stage hydrothermal superposition alteration in the Nihe iron ore deposit.Using the isocon diagram, according to the late stage alteration of the area, Based on the actual situation above the stage of alteration, the best equal concentration equation was fitted by using the original altered rock as the original rock and the later inactive rock, and quantitatively revealed the migration rule of major elements during hydrothermal alteration. The results show that the sequence of deposition of cations in Nihe ore deposit is roughly as follows: Na → Ca, Mg, Fe, P → Ca, Fe → Al, Si. From early to late, Alteration of mineralization is a continuous process.A large number of albite is a sign of Na deposition, which represents the beginning of iron mineralization.Alumina is a manifestation of Ca, Mg and Fe precipitates, Nearly mineralization and ore-hosting alteration. Secondary quartzization and kaolinite are the result of Al, Si-type sediments that migrated from the early stage and are the remote indication alteration of magnetite mineralization.