The sedimentary environment and geochemical characteristics of isotopes of carbonate rocks of upper Permian in Guandi of Linxi County, Inner Mongolia

Abstract

The Late Permian in Guandi is a set of dark mudstone, gray sandstone, and carbonate sedimentary combination in Linxi County, Inner Mongolia. There are limited drilling footage and coring data and few previous studies on the late Paleozoic strata and sedimentary environment in the basin. In this paper, the carbonate rocks taken from Linxi County are analyzed systematically. The results indicate that the main body of Linxi formation sedimentation period in the study area is sea phase but is significantly affected by the effect of land-source debris – strong reduction environment, carbon and oxygen stable isotope relationship diagram shows the characteristics of typical sea phase and land phase fresh water mixing. The combination of rock phase and paleontological fossils is considered a limited trench environment, which is frequently affected by the mixing effect of land-based debris, reduction-strong reduction, and hydrothermal action during the Late Permian period of Linxi County, Inner Mongolia.