Cyclical sediment, Varves deposited in a glacial age lake in easten Canada
Cyclical sediment, Varves deposited in a glacial age lake in easten Canada
Rhythmic lamination and Cross Bedding a Rhythmic laminations may result from a succession of large storms a Cross bedding creates beds that are inclined with respect to a thicker stratum within which they occur. Cross bedding is the work of turbulent flow in the transporting agency
Rhythmic Lamination and Cross Bedding ◼ Rhythmic laminations may result from a succession of large storms. ◼ Cross bedding creates beds that are inclined with respect to a thicker stratum within which they occur. ◼ Cross bedding is the work of turbulent flow in the transporting agency
Graded Bedding In graded bedding, the particles are sorted more or less according to size, grading upward from coarser to finer. Most coarse clastic sediments consist of mineral grains and rock least susceptible to chemical and physical breakdown. High content of quartz and potassium feldspar
Graded Bedding ◼ In graded bedding, the particles are sorted more or less according to size, grading upward from coarser to finer. ◼ Most coarse clastic sediments consist of mineral grains and rock least susceptible to chemical and physical breakdown. ◼ High content of quartz and potassium feldspar
Graded Bed, Mudflow sediment
Graded Bed, Mudflow sediment
Characteristics of chemical sediments Chemical sediments are formed by precipitation of of minerals from solution in water They form in two principal ways Through biochemical reactions resulting from the activity of plants and animals in the water. Inorganic reactions in the water. When water from a hot spring cools, it may precipitate opal (a hydrated silicate)or calcite(calcium carbonate)
Characteristics of Chemical Sediments ◼ Chemical sediments are formed by precipitation of minerals from solution in water. ◼ They form in two principal ways: 1. Through biochemical reactions resulting from the activity of plants and animals in the water. 2. Inorganic reactions in the water. ◼ When water from a hot spring cools, it may precipitate opal (a hydrated silicate) or calcite (calcium carbonate)