Danxiashan is a typical representative of the world natural heritage of “China Danxia”. At present, the study degree?of the sedimentary environment of Later Cretaceous Danxia Formation is low, especially the sedimentary environment of the Jinshiyan member of Danxia Formation is still controversial. The Jinshiyan member is mainly composed of thick medium?fine sandstone, with large cross?bedding, intercalated with thin and very thin bedded mudstone, silty mudstone and calcareous layer. This paper discussed the sedimentary characteristics and genesis of sandstones of the Jinshiyan member by means of SEM, particle size analysis and petrogeochemistry. The results show that this set of sandstone is mainly feldspar quartz sandstone. Under the microscope, quartz particles are often harbor impact pits, and the edges of the particles are developed with iron, manganese and argillaceous borders. The cementings are mainly montmorillonite and calcite. Under SEM, the surface of quartz particles is characterized by disc impact crater and aeolian deposition. Separation of sandstones is good, ΣREE = 40.2×10-6～215.0×10-6, LREE/HREE = 5.54～12.46, LREE is rich, HREE is relatively deficient. The negative value of δEu is obvious, while the Ce is normal. It is composed of elements with high field intensity （Pb, Zr, Hf） and large ionic lithophile elements （Rb, Ba） similar to the crust of mainland China. The chemical alteration index （CIA） is between 56.99 and 75.87, which reflects the low degree of ancient weathering and indicates the dry and hot climate conditions. La/Yb-ΣREE diagrams and F1-F2 discriminant function diagram indicate that the sandstone of the Jinshiyan member of Danxia Formation is mainly from the ancient upper crust, has the characteristics of intracontinental rift properties of passive continental margin. During the depositional period of the Late Cretaceous Jinshian member in Danxia Basin, there was a dry surface depositional environment, which may be related to the arid paleoclimatic conditions of the Late Cretaceous Campanian in middle latitudes of East Asia.
Liu Fujun Yang Qingkun Guo Fusheng Sun Chuanmin Chen Liuqin Hua Chen. Sedimentary characteristics and genesis of Late Cretaceous sandstone of Jinshiyan member of Danxia Formation, in Danxia Basin, northern Guangdong[J]. Chinese Journal of Geology, 2020, 55(1): 200-217.