1. 1. Instituted of Geology 6th Semester (Morning) Submitted by: Raja Saad Qamar Roll No: 37 Submitted To: Mam Shazia Subject: sedimentation and sedimentary basin
2. 2. Topic Classification of Marine Depositional Environment
3. 3. Introduction Depositional environment Landscapes form and constantly change due to weathering and sedimentation. The area where sediment accumulates and is later buried by other sediment is known as its depositional environment.
4. 4. Types of Depositional Environments Continental Transitional Marine
5. 5. Marine Environments (1) The continental shelf It is nearly flat, gently sloping edge of the continent that extends under the ocean. Sediments wash off of the continent onto the shelf and range in size from coarse sand closest to the continent fining to clays. In some areas coral reefs or carbonate muds dominate the shelf.
6. 6. (2) Continental Slope More steeply sloping edge of shelf that extends down to the ocean floor. Sediments on the slope consist of fine silts and clays.
7. 7. (3)Continental Rise Fan shaped deposit of sediment at the base of the continental slope, often contains turbidities deposits from turbidity currents. Sediments consist of sands, silts and clays from shelf.
8. 8. (4)Abyssal plain It is the deep ocean floor. It is basically flat, and is covered by very fine-grained sediment, consisting primarily of clay and the shells of microscopic organisms (such as foraminifera, radiolarians, and diatoms). Abyssal plain sediments may include chalk, diatomite, and shale, deposited over the basaltic ocean crust.