表生环境汞的迁移和富集机制

层控矿床是国际矿床学界近十余年来讨论最热烈的问题之一。我国层控矿床十分发育,其中汞矿也具有典型的层控特征。这些矿床的成因研究目前正受重视,传统的成因观点也被怀疑。近几年,人们普遍认为中国多数汞矿应属“沉积-地下水热液”或“沉积改造”成因。但是,对于这种矿床成因观点的一些具体问题,例如在成矿的第一阶段中,元素的表生迁移搬运、元素的初步沉积富集或使这些元表生富集到形成矿床的机制等,直到目前,研究仍然甚少。本文的目的在于通过探讨,深化对汞矿成因的认识。

PRELIMINARY STUDY ON MECHANISM OF MIGRATION AND CONCENTRATION OF MERCURY IN SUPERGENIC ENVIRONMENT

This paper discussed the mechanism of migration and concentration of mercury in supe-rgenic condition.From the study, the author supposes that migration of mercury shows more intensive in the superficial drainage system its migration was in three ways, i.e. mechanical, colloidal and in complex form. In genral the mercury transported in the sedimentary environment by migration was deposited down there in mechanical clastic sediments, colloid-condensed sediments and biogenic deposits. After migration and sedimentation mercury may be first concentrated to reach the degree of metallization. Therefore, the author holds the opinion that the theory of "sedimentary-non-magmatic hydrothermal" or "sedimentary reformed" origin of mercury ore appears to be scientific and can be considered as a new advance in metallo-geny studies.