PPT-GEY 314: Sedimentary structures

Sedimentary structures Sedimentary structures  are those structures formed during sediment deposition Sedimentary structures such as  cross bedding graded bedding mud cracks Strata. . Folded beds. Tilted beds. Discordant relationships. Tilted bedding . below discordance. (nonconformity). Discordance. (nonconformity). Bedding above the discordance. Sedimentary structures. Bedding and lamination. OR. Strategy:. Relate sedimentary characteristics of ancient deposits (grain size, . sedimentary . structures, geometry) to features observed in modern rivers. Bedforms. during traction deposition from unidirectional flow. Kinematic analysis of deformation. B. Natalin. Structural geology and tectonics. Structural geology is the study of deformation of rocks. - we study such features as folds, faults, their geometry, movements, origins;. Geology 103. Depositional environment. Is the term given to the area where the sediment was originally deposited. Must be inferred from the rock identity. Clastic. . depositional environments. Dominated by actions of waves, tides and currents. UNIT . 5. What are Sediments. Sediments are loose Earth materials (unconsolidated materials) such as sand . which are . transported by the action of water, wind, glacial ice and . gravity.. These . materials are . What You Will Learn. Describe the origin of sedimentary rock. . Describe the three main categories of sedimentary rock. . Describe three types of sedimentary structures. . Where does Sand come from?. Sedimentary rocks form in 1 of 3 ways:. 1. . Clastic. Sedimentary Rocks- made of pieces and grains of other rocks. Material such as . sand . or . mud. -usually deposited in . water. Conglomerate sandstone. Microbial assemblages (in biofilms) form sticky films that influence sediment deposition. Microbially. -bound sediments are stabilized and more cohesive. Microbialite. : a rock formed via the influence of microbial trapping, binding, and precipitation. What are Sediments. Sediments are loose Earth materials (unconsolidated materials) such as sand . which are . transported by the action of water, wind, glacial ice and . gravity.. These . materials are . TRANSPORT MEDIA. Gravity. . is the . simplest mechanism of sediment . transport.. It includes the . movement of particles under gravity . down a . slope. .. Rock falls generate piles of sediment at . Kinematic analysis of deformation. B. Natalin. Structural geology and tectonics. Structural geology is the study of deformation of rocks. - we study such features as folds, faults, their geometry, movements, origins;. BSc 4. th. Semester (Open Elective). Other than Geology main students . Dr Abdullah Khan. Associate Professor. Department of Geology, AMU. Sedimentary structures. Sedimentary structures are generally three-dimensional physical features of sedimentary rocks; they are best seen in outcrop or in large hand specimens rather than through a microscope. . Sediment . Texture. Sediment texture refers to the shape, size and three-dimensional arrangement of the particles . that make . up sediment or a sedimentary rock.. Textures can be . clastic or . crystalline. Do Now. 1.  What is an igneous rock?. 2. How do sedimentary rocks form?. Sedimentary Rocks -. are one of the three main rock types . A sedimentary rock can form one of three ways: . by the . deposition.