辽东—吉南地区下元古界硼矿床成因的商榷——兼论容矿大理岩及硼矿矿床的成因

Analysis on cause of Lower Proterozoic Erathem boron deposit in eastern Liaoning and southern Jilin, and discussion on cause of ore-hosting marble and boron deposit

辽东—吉南地区下元古界产有丰富的硼矿资源,半个多世纪以来几乎所有硼矿地质勘查报告及有关论文、专著等无不涉及矿床成因。关于硼矿床成因主要有沉积变质成矿、沉积变质再造成矿、超变质热液成矿等3种观点(称传统观点,下同),传统观点认为硼的成矿物质来源于下元古界地层,经混合岩化或超变质热液将地层中分散的硼活化、迁移至镁质大理岩富集成矿。在编纂《中国矿产地质志·硼矿卷》过程中,对辽吉硼矿进行了新一轮研究,认为传统观点硼矿床成因值得商榷,并提出碳酸岩岩浆期后含硼热液交代早期喷溢的碳酸岩成矿的论说。

There are lots of boron resources in Lower Proterozoic Erathem of eastern Liaoning and southern Jilin. For more than half a century, almost all of geological survey reports, papers and monographs on boron deposits involve genesis of deposits. There are 3 kinds of traditional views of genesis of boron deposits： sedimento-metamorphic deposit, sedimento-metamorphic-remoulded deposit and ultrametamorphism-hydrothermal deposit. From traditional views, we can summarize that metallogenic materials are from Lower Proterozoic Erathem, and the dispersed boron in stratum is activated and migrated into magnesia marble to enrich by these materials which are are subjected to migmatization or ultrametamorphism. In the compilation of ＂Volume for Boron of Mineral Geology of China＂, boron deposits in Liaoning and Jilin are further studied. We consider that it is worth discussed for the traditional genesis of boron, and based on the study, we carry out a new argument that hydrothermal containing boron metasomatics early eruption carbonate rocks to mineralization after the magmatic period of carbonatite.