ductile deformation or metamorphism is documented. Contact metamorphism exists along the contact volcanic and intrusive units, but foliation and folding are not a significant part of the regional geology. Bedding due to debris, ash, and lava flow exists in the volcanic units and bedding structures are apparent in the Cambrian and Ordovician rocks.

CONTACT/REGIONAL AND METASOMATIC ROCKS Marble, Quartzite, and Serpentinite Marble is a metamorphic rock consisting of fine to coarsegrained recrystallized calcite and/or dolomite. It is often formed by metamorphosis of limestone and may be either contact or regional metamorphic rock intermediate in grade between slate and mica schist. The surface may

Marble is a metamorphic rock that forms when limestone is subjected to the heat and pressure of metamorphism. It is composed primarily of the mineral calcite (CaCO 3) and usually contains other minerals, such as clay minerals, micas, quartz, pyrite, iron oxides, and graphite.

regional metamorphism of dolomite and limestone. Marble forms as the result of the metamorphism of limestone and dolomite Marble is a metamorphic rock resulting from regional or rarely contact metamorphism of . Get Price; Dolomite: A sedimentary rock known as dolostone or,

limestone is defined by isoclinally refolded recumbent folds. Osberg (1968 and personal communication) and Ferry (1984) mapped isograds in pelitic schists based on the development of biotite, garnet, staurolite + andalusite, and sillimanite during Buchan regional metamorphism. Porphyroblasts of biotite and

Quartzite is a nonfoliated, granoblastic (intergrown, interlocking, equidimensional, enlarged grains), metamorphic rock composed predominantly of quartz. It forms by the regional, burial or contact metamorphism of quartzrich sandstones or chert. Grade: low to high. Parent Rock: quarrzrich sandstone or chert.

Regional Metamorphism Regional metamorphism is metamorphism that occurs over broad areas of the crust. Most regionally metamorphosed rocks occur in areas that have undergone deformation during an orogenic event resulting in mountain belts that have since been .

Nov 06, 2009· Marble is a metamorphic rock resulting from regional or, rarely, contact metamorphism of sedimentary carbonate rocks (either limestone or dolomite rock) or metamorphism of older marble. This metamorphic process causes a complete recrystallization of the original rock into an interlocking mosaic of calcite, aragonite and/or dolomite crystals.

Subduction zone metamorphism is a type of regional metamorphism that occurs when a slab of oceanic crust is subducted under continental crust (see Chapter 2). Because rock is a good insulator, the temperature of the descending oceanic slab increases slowly relative to the more rapidly increasing pressure, creating a metamorphic environment of high pressure and low temperature .

Close to the intrusion is the hydrothermal (or metasomatic) aureole where minerals from the hot fluids have their greatest effect. Further away is the thermal aureole where heat is the primary effect. The dimensions of the aureoles are dependent on the size of the intrusive body and the amount of .

Zeolite Facies. Rocks formed under extremely high pressures (>10 kb) and moderate to high temperatures are called eclogite and are often rich in garnet and pyroxene. 8. The hornfels comprise the series of rocks that result from contact metamorphism under low pressures and a .

Dolostone is the name of a sedimentary rock that is dominantly composed of the mineral dolomite (CaMg(CO3)2). Dolomite is a carbonate mineral similar to calcite (CaCO3), the dominant mineral in limestone and marble. Dolostones are easily distinguished from limestones by using the dilute hydrochloric acid (HCL) test.

Contact or thermal metamorphism – driven by a rise in temperature within the host rock. Metamorphic settings. Hydrothermal metamorphism – chemical alterations from hot, ionrich water. Regional metamorphism . Occurs during mountain building. Produces the greatest volume of metamorphic rock. Agents of metamorphism. Heat. Most important agent

Metamorphic rock fall into two categories, foliated and unfoliated. Most foliated metamorphic rocks originate from regional metamorphism. Some unfoliated metamorphic rocks, such as hornfels, originate only by contact metamorphism, but others can originate either by contact metamorphism or by regional metamorphism.

Metamorphism can be instantaneous as in the shearing of rocks at plate boundaries or can take millions of years as in the slow cooling of magma buried deep under the surface of the Earth. There are three ways that metamorphic rocks can form. The three types of metamorphism are Contact, Regional, and Dynamic metamorphism.

Regional Metamorphism occurs on a large scale, typically involving hundreds of square kilometers of surface area. It is the most widespread of the metamorphic types and is typical of the major foldmountain belts such as the Appalachians, Himalayas, Alps or Rocky Mountains.

Foliated Texture. The mineral constituents of foliated metamorphic rocks are oriented in a parallel or suhparallel arrangement. Foliated metamorphic rocks are generally associated with regional metamorphism. Four kinds of foliated textures arc recognized. In order of increasing metamorphic grade, these are slaty, phyllitic, schistose and gneissic.

Dolomite is a carbonate mineral similar to calcite (CaCO3), the dominant mineral in limestone and marble. Dolostones are easily distinguished from limestones by .

regional metamorphism [ rē ′ jənəl ] A type of metamorphism in which the mineralogy and texture of rocks are changed over a wide area by deep burial and heating associated with the largescale forces of plate tectonics.

Metamorphic Rocks, Processes, and Resources Metamorphic rocks are rocks changed from one form to another by intense heat, intense pressure, and/or the action of hot fluids. Protolith or parent rock is the rock type that a metamorphic rock was before it was subjected to metamorphic conditions.

A collection of Javascript utilities to be incorporated into scientific courseware. Multiple Choice Questions Metamorphic Rocks Chapter 7. Each chapter will include a few questions designed to test your knowledge of material covered in the chapter and in the Internetbased resources.