山东平邑盆地石膏矿地质特征及成因探讨

Geological Characteristics and Its Origin of

摘要:

平邑盆地位于鲁西断块隆起区东南蒙山断裂以南，蒙山断裂位于平邑盆地的北部边缘，盆地的形成、形态分布和演化严格受其控制。平邑盆地石膏矿床赋存于古近系官庄群。中生代的燕山运动，伴随火山活动，沿蒙山断裂南侧不断下沉，为平邑盆地的形成奠定了基础，新生代以来蒙山断裂南东盘仍以断陷为主，为下古近系官庄群地层的沉积提供了空间，平邑盆地便成为石膏矿床形成的有利场所。从矿（岩）石化学成分对比，物质来源分析，平邑盆地石膏矿床为多物源，多成矿期的陆相咸化湖盆蒸发岩矿床。

Abstract:

Pingyi basin located in the south of southeast Mengshan mountain in Luxi faultblock uplift. Mengshan block located in northern edge of Pingyi basin. Formation, morphology and evolution of this basin are strictly controlled by this fault. Gypsum deposits in Pingyi basin occurred in the middle part of the second section of Paleogene Guanzhuang group. Mesozoic Yanshan movement, accompanied by volcanic activities had been sinking along south side of Mengshan fault. It has laid the foundation for the formation of Pingyi basin. The southeast part of Mengshan fault has been sinking from Cenozoic. It will provide space for sedimentary of strata in lower Tertiary Guanzhuang group. Thus, Pingyi basin has become a favorable location for the formation of gypsum deposits. Through constrast of chemical composition of rock and analysis on material sources, it is regarded that gypsum deposits in Pingyi basin are multimaterial and multistage continental salt evaporite basin.