Abstract: We collected micrographs of Permian volcanolithic sandstone-laden fragments from southwestern China and build this microscopic image dataset. This paper is an endeavor to present this dataset and to introduce the lithic characteristics of representative micro images. A camera-loaded Zeiss polarizing microscope (Zeiss) was used to observe and photograph sandstone thin sections. This microscopic image dataset contains 318 micrographs of 43 medium-grained sandstone flakes. Based on their micro textures and detrital components, the sandstone flakes were divided into the five categories: lithic, feldspatho-lithic, litho-feldspathic, quarto-lithic and litho-quartzose sandstone. This dataset can be used to support research on sandstone microscopic observation, classification and modal composition. It can also be used as a reference for digitization and auto identification of sandstone petrofacies, providing bases for accurate digital identification of sandstone features in the future.
Keywords: Permian sandstone; volcanic lithic fragment; southwest China; micrographs; digitization