Study On The Surface Morphology Of Quartz Particles In The Red Weathering Crust Of Liaodong Peninsula

Based on a large number of field surveys in the Liaodong Peninsula,this paper selects 6 red weathering crust samples and 1 base rock in the Chengshantou red weathering crust section in the east and Lashufang red weathering crust section in the west for sample processing,and screened out coarse sand and medium.Fine sand.In the two sections,representative samples of quartz particles were selected,and the samples were observed in detail with a scanning electron microscope.Using the quartz particle percentage method,the morphological characteristics of the red weathering crust and bedrock particles in the Liaodong Peninsula were deeply studied,and the sedimentary environment was inferred.Characteristics,material sources and paleoenvironmental evolution,draw the following conclusions:(1)The roundness of quartz particles in the bedrock and red weathering crust of Chengshantou and Lashufang sections is mainly sub-angular.The quartz particles in the two sections have not been transported remotely,and the edge shapes are mainly sub-ridges and ridges.Less ridge erosion,mainly mechanical abrasion,supplemented by chemical erosion.The quartz particles in the bedrock of Chengshantou section experience strong wind erosion mechanical impact and medium-high energy underwater environment;the quartz particles in the bedrock of Lashufang section experience weak wind erosion mechanical collision and high-energy underwater environment;in the two sections The red weathering crust quartz particles are more strongly modified by chemical action,and the bedrock quartz particles are more highly modified by eolian and hydraulic processes.(2)The four sections of bedrock and red weathered crust quartz particles all have the characteristics of aeolian and hydromechanical genesis.The bedrock particles undergo strong wind erosion and collision and are transported underwater,and then transported by rivers in high-energy underwater environments.It enters the sea and has the characteristics of mechanical origin in the high-energy underwater environment.Therefore,the bedrock particles are subjected to the combined influence of aeolian and hydraulic effects,and the bedrock material has aeolian and water background.Based on the percentage of chemical genesis characteristics,it is inferred that the degree of development of the red weathering crust in the Liaodong Peninsula is decreasing from east to west.It may be due to the relatively flat terrain in the east and the proximity to the Pacific Ocean,which is susceptible to the influence of water vapor,with more precipitation and better hydrothermal conditions than the west.,The chemical transformation is more intense,in line with the development environment of the red weathering crust in the Liaodong Peninsula.(3)The surface morphology of the quartz particles in the bedrock and the red weathering crust are basically the same.During the diagenesis process,the bedrock pellets are transported to the ocean by rivers at a short distance after wind erosion and underwater transportation,indicating that the quartz particles may originate from Terrigenous debris.During the weathering process,the red weathering crust quartz particles effectively carry most of the surface morphological characteristics of the bedrock particles.The aeolian and hydrogenic mechanical characteristics of the quartz particles in the red weathering crust on the surface are inherited from the quartz particles in the bedrock.,It is inferred that the source of the red weathering crust is formed by the in-situ residue formation of the bedrock after weathering,that is,it is composed of the acid-insoluble residues left in-situ by the underlying carbonate rock under the action of chemical weathering.