Sedimentology Lecture Series: Residual Deposits, Terra Rossa, Laterite & Bauxite
Residual Deposits Residual deposits are an important topic in sedimentology, representing materials left behind after extensive chemical weathering of rocks. These deposits provide valuable clues about past climates and soil-forming processes. What are Residual Deposits? Residual deposits are formed in place by the breakdown and chemical alteration of pre-existing rocks. Unlike transported sediments, they remain at the site of their formation. These deposits are particularly significant in tropical and subtropical regions, where weathering is intense. Texture of Residual Deposits The texture of residual deposits is typically fine-grained due to the removal of soluble minerals and the concentration of insoluble materials like iron and aluminum oxides. This gives rise to distinctive soil types and ore deposits. Types of Residual Deposits Terra Rossa: A red, clay-rich soil formed over limestone, common in Mediterranean climates. Its color comes from iron oxide accumulation. Laterite:...