Research progress of the boron mineralization belt in the Liaodong Peninsula
The Liaodong Peninsula(LP)is an important metallogenic region of boron in China.The Jiao-Liao-Ji Paleoproterozoic orogenic belt/active belt(JLJ)adjacent to the LP hosts boron deposit formed in a continental active margin setting.The boron deposits in the LP are considered to be resulted from sedimentary-metamorphic reworking mineralization.The boron materials in the LP originated from altered seafloor,subducted sediments,serpentinized mantle wedge in the boron-enriched subducted oceanic system.The boron materials were released from the subducted units at sub-arc depth and were transported upward into the upper mantle and island arc volcanic system.The pristine borate beds in the volcanic basin were enriched by the submarine hot spring,and were isolated by subsequent volcanic-sedimentary covers.The mineralization of borate was associated with the regional metamorphism and deformation.The hydrous borates underwent metamorphic dehydration and re-crystallization and then precipitated in deformation-developed regions.The boron isotopes of boron deposits in the LP strongly inherit from the heavy B isotopic source reservoirs,and thus provide insights into the metallogenic environment of the boron deposits.The copper-bearing pyrite deposits posterior to the boron deposits are located adjacent to the volcanic feeders,whereas the boron deposits formed in the volcanic basin.Accordingly,the boron prospecting is suggested to taking into account of the paleogeographic study by combining the spatiotemporal relations between pyrite deposits and boron deposits.The Hupiyu-Hongshilazi-Qinghe acticlinoria,as a result of multiple and superimposed deformation in the Liaohe tectonic cycling,broadly controlled the spatial patterns of the boron deposits.In conclusion,we established the metallogenic and prospecting models of boron deposits in the LP,and analyzed prospecting criteria of boron deposits in the LP.It is emphasized that the stratum areas partially covered by the Gaixian Formation have the potential for prospecting the concealed boron deposits in future.
万方数据
维普
