Retrograde motion in astronomy is, in general, orbital or rotational motion of an object in the direction opposite the rotation of its primary, that is the central object (right figure). It may also describe other motions such as precession or nutation of the object's rotational axis. Prograde or direct motion is motion in the same direction as the primary rotates. prograde vs retrograde geology International Geology Review Volume 44, 2002 Issue 9. Submit an article Journal homepage. 139 Views 48 CrossRef citations to date Altmetric Listen. Original Articles Prograde and Retrograde PT Paths of the Late Paleozoic Glaucophane Eclogite from the Renge Metamorphic Belt, Hida Mountains, Southwestern Japan.
Prograde and retrograde metamorphism are not balanced processes. Prograde metamorphism takes place faster, and produces more dramatic change because of the presence of water in the rocks (see explanation of the difference water makes). Retrograde metamorphism, beginning with a dry rock, is slower, and does not produce as dramatic a change. prograde vs retrograde geology
prograde vs. retrograde textures prograde reactions involve dehydration; the dehydration, along with higher T, promotes diffusion, leading to large, homogeneous grains Part 11. Interaction Between Metamorphism and Deformation Part 12. Metamorphism and Geochronology Part 13. Retro vs Prograde Rotating Earth Climates May 1, 2018 1554 664 What Would Happen If the Earth Started Spinning Backward? Kppen Climate Classification (colors) for a retrograde (RETRO; left) and a prograde (CNTRL; right) rotating Earth under preindustrial climate forcing. In metamorphic rock: Retrograde metamorphism. In general, the changes in mineral assemblage and mineral composition that occur during burial and heating are referred to as prograde metamorphism, whereas those that occur during uplift and cooling of a rock represent retrograde metamorphism. prograde vs retrograde geology Prograde and retrograde. Metamorphism is further divided into prograde and retrograde metamorphism. Prograde metamorphism involves the change of mineral assemblages Marshak, Stephen, 2009, Essentials of Geology, W. W. Norton& Company, 3rd ed. ISBN The metamorphic rocks in the Arquia valley were affected by prograde metamorphism, which was followed by a retrograde event after reaching maximum temperature and pressure conditions. The relationships among the various types of rocks that form the Retrograde skarn mineralogy, in the form of epidote, amphibole, chlorite, and other hydrous phases, typically is structurally controlled and overprints the prograde zonation sequence. Thus, there often is a zone of abundant hydrous minerals along fault, stratigraphic, or intrusive contacts. How can the answer be improved?