中扬子区中生代含变质岩屑砂岩的显微图像数据集

A microscopic image dataset of Mesozoic metamorphic grains bearing sandstones from mid-Yangtze,China

本文收集和归纳了中扬子北缘三叠系至侏罗系砂岩的显微图像数据。样品主要为中粗粒砂岩。我们系统鉴定和部分统计了86件岩石样品的碎屑组分,识别出岩屑石英砂岩、石英岩屑砂岩和长石石英砂岩等8种不同类型的砂岩,拍摄了287张岩石显微图像照片。我们重点描述了含变质岩屑的砂岩显微图像特征,并对变质岩屑的变质等级和原岩类型进行了分类。本图集的建立丰富了中扬子区中生代沉积地质演化的基础研究,并可作为变质岩屑的识别与分类的案例,为追溯变质岩屑源区,重塑造山带剥露历史等研究提供一定的参考。

This paper presents a microscopic image dataset of the Triassic-Jurassic clastic rocks in mid-Yangtze.Our samples are mainly medium to coarse sandstone.We systematically analyzed and partially counted detrital components of 86 samples,and after a detrital modal analysis,identified eight different types of sandstone including litho-quartzose,quartzo-lithic,feldspatho-quartzose,etc.287 microscopic images of them were taken.We mainly deciphered the microscopic characteristics of the metamorphic grains and further classified their metamorphism rank as well as their prototypes.The establishment of this dataset helps enrich the basis for skeleton research of the Mesozoic sedimentary evolution in mid-Yangtze.It provides references for identifying and classifying metamorphic grains,tracking their places of origin,or reconstructing the exhumation process of orogenic belts.