This type of metamorphic was created by regional metamorphism, in which a sedimentary or igneous rock has been deeply buried and subjected to high temperatures and pressures. Nearly all traces of the original structures (including fossils) and fabric (such as layering and ripple marks) are wiped out as the minerals migrate and recrystallize.
In regional metamorphism, because of the large distance to cover, it is not easy to see different mineral assemblages (in equilibrium at different temperatures) right next to each other. In contact zones around igneous intrusions (CONTACT METAMORPHISM) these relationships are more readily observable.
The geology of the Neoproterozoic SwakopOtavi transition zone ... greenschist facies regional metamorphism during ... a limestonedolomite ...
Regional distribution of mineral assemblages ... limestones and dolomites intercalated with minor ... Metamorphism of mesozoic calcareous metasediments 105
Stratigraphy, structural geology and metamorphism of the Inwood Marble Formation, northern Manhattan, ... Club in front of a "limestone" waste ...
The PT conditions of metamorphism in the southern and central Damara Orogen are determined by correlations of mineral assemblages in siliceous dolomites with corresponding experimentally investigated reaction equilibria. The temperature peak reached during metamorphism was assessed by appliion of the dolomitecalcite .
· Limestone is a sedimentary rock composed mainly of calcium carbonate (CaCO3). It may contain considerable amounts of magnesium carbonate (dolomite) as well. Marble is a metamorphic rock resulting from regional or rarely contact metamorphism of sedimentary carbonate rocks, or metamorphism of older marble.