Abstract: Late Cretaceous-Eocene carbonate rocks (with some sandstone or mixed siliciclastic-carbonate interlayers) are widely exposed in the western Tarim Basin, Xinjiang Uygur Autonomous Region, China. The study of these carbonate rocks can be used to restore the Cretaceous-Paleogene paleogeographical evolution of the Tarim Basin and the tectonic evolution of the northern margin of Tibetan Plateau, reveal the aridification process of Central Asia, and provide the necessary evaluation suggestions for oil and gas exploration. Although these stratums have been researched for over 30 years, the publicly accessible basic petrological datas are still very scarce, and thus repeated studies are still ongoing. Therefore in this paper, we provide polarized light micrographs under thin section of 682 rocks from these strata. Only micrographs include the necessary repeatable observation information are included in the dataset; and the sample location, stratigraphic age, rock name, and rock characteristics are also provided. This micrographs dataset can be widely used for academic geological research of the Late Cretaceous-Eocene in the western Tarim Basin, and can be applied to petroleum exploration and engineering survey. Among them, the typical shallow marine sedimentary characteristics in thin sections can also be applied to scientific research, teaching, and public outreach.
Keywords: thin section; polarized light micrograph; carbonate rocks; western Tarim Basin; Late Cretaceous-Eocene