Knowra Salt tectonics Salt tectonics Salt tectonics is the deformation and movement of underground salt deposits under pressure over geologic time. Because salt flows more readily than most surrounding rocks, it can rise, spread, and reshape sedimentary basins.
Salt diapir : A buoyant body of salt that rises through denser surrounding rock and deforms overlying strata. Diapirs are a major form of salt movement, rising when buoyancy and pressure overcome resistance.
Rock salt : A sedimentary rock composed mainly of halite, formed by evaporation of saline water. Rock salt is the material that flows and deforms in salt tectonics.
Salt basin : A sedimentary basin containing thick, regionally extensive salt deposits. Basin geometry and salt distribution set the context for tectonic styles and resource exploration.
Gulf of Mexico salt basin : A major salt-bearing basin whose salt structures developed during opening and subsidence of the Gulf of Mexico. Its linked domains of extension, salt movement, and shortening are a classic salt-tectonic system.
Thin-skinned tectonics : Deformation in which a shallow sedimentary cover moves above a detachment, largely decoupled from deeper basement. Salt can act as the weak detachment beneath thin-skinned deformation, but salt tectonics also includes salt flow itself.
Halokinesis : The movement and deformation of salt within the Earth, including flow, folding, and diapirism. This term names the salt-driven motion at the center of salt tectonics.
Halite : The mineral sodium chloride, which is the principal constituent of many underground salt deposits. Halite’s mechanical properties help explain why salt behaves differently from surrounding rocks.
Petroleum trap : A subsurface arrangement of rocks that prevents migrating petroleum from escaping. Salt bodies and their deformed margins can create traps for oil and gas.
Zechstein : A thick Permian evaporite sequence beneath parts of northwestern Europe. Zechstein salt has been mobilized into extensive diapirs and related structures.
Basement tectonics : Deformation involving faults and structures that extend into crystalline basement rocks. Basement faulting can drive or redirect salt deformation, unlike movement confined to the salt layer.
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