中祁连西段余石山铌钽矿含矿地层重新厘定及意义

余石山变粒岩型铌钽矿是近年在中祁连西段发现大型铌钽矿,但对铌钽矿含矿地层归属厘定不清,本研究在梳理前人研究成果基础上,通过野外精细调研和区域对比,重新厘定了这套地层,建议将其从长城纪熬油沟组中解体出来,建立新的岩石地层单位,即新元古代余石山岩组;同时,分析了余石山岩组原始层序,总结了其形成过程。研究为中祁连地块西段地层对比和研究提供了新材料,同时为中祁连西段变粒岩型铌钽矿找矿和成矿研究提供了基础。

Determination of Yusishan Nb-Ta deposit bearing strata in western Central Qilian and its significance

Yushishan Leptynite type Nb-Ta Deposit is a large Nb-Ta ore discovered in western Central Qilian in recent years, but the attribution of Nb-Ta ore bearing strata is unclear. This study, on the basis of combing previous research results, through fine field research and regional comparison, this set of strata has been redefined, and it is suggested that it is disassembled from the Changcheng Period Aoyougou Formation to establish a new lithostratigraphic unit, namely the Neoproterozoic Yushishan Formation; The original sequence of Yusishan Formation is analyzed, and the formation process is also summarized. The study provides new materials for stratigraphic correlation and research in the western section of the Central Qilian massif, and also provides a basis for prospecting and metallogenic research of Yusishan granulite Nb Ta deposit in the western section of the Central Qilian massif.