mantled gneiss dome
mantled gneiss dome A dome of granitic migmatites and gneisses surrounded by a ‘mantle’ of metasediments which characteristically show outward-dipping parallel fabrics and foliations. The feature is thought to be produced by gravitational instabilities due to a density inversion in which dense rocks overlie a less dense, granite—gneiss core.
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Core , core / kôr/ • n. 1. the tough central part of various fruits, containing the seeds: an apple core. 2. the central or most important part of something… xenolith , xenolith An inclusion or enclave of a preexisting rock in an igneous rock. Xenoliths are often derived from the country rocks that have been invaded… Exfoliation , Exfoliation
Exfoliation is the term used to describe the peeling away of sheets of rock millimeters to meters in thickness from a rock's surface due… Igneous Rocks , Igneous rocks are formed by the cooling and hardening of molten magma. The word igneous comes from the Latin word igneus, meaning fire, and there are… Magma , Magma is molten rock within Earth that consists of liquids, gases, and particles of rocks and crystals. Magma has been observed in the form of hot la… Hornfels , Hornfels is a fine-textured metamorphic rock formed by contact metamorphism . Contact metamorphism occurs when a mass of hot magma intrudes into pree…
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mantled gneiss dome