Metamorphic rock can be describe in many ways. 17120 and actual rock samples of them if available.
Chapter 7 Metamorphic Rocks Metamorphic Rocks Metamorphic Igneous
The general process for writing rock descriptions is to start off with a general description general colour grain size texture followed by identification of the minerals within the rock the mineral assemblage the name of the rock deduced from the assemblage and then finally your best guess on how and where.
. Within those classifications there are further subdivisions to accommodate the. Regional metamorphism transforms large areas of existing rocks under the tremendous heat and pressure created by tectonic forces. They are distinguished from igneous rocks which form from molten magma and sedimentary rocks which form from sediments eroded from existing rock or precipitated chemically from bodies of water.
Metamorphism meta change morph form happens when molten rock intrudes other rocks and bakes the contact zone where the molten rock touches the preexisting rock. The term as we will use it has no genetic implication. How are metamorphic textures described.
Metamorphic rocks form when rocks are subjected to high heat high pressure hot mineral-rich fluids or more commonly some combination of these factors. The concept of metamorphic facies is a systematic way to look at the mineral assemblages in rocks and determine a potential range of pressure and temperature PT conditions that were. As metamorphic rocks change under heat and pressure their ingredients recombine into new minerals that are suited to the conditions.
The word metamorphic means change of form. Igneous sedimentary and metamorphic. Conditions like these are found deep within the Earth or where tectonic plates meet.
Updated on March 27 2017. Metamorphism is the addition of heat andor pressure to existing rocks which causes them to change physically andor chemically so that they become a new rock. A texture that shows layers or bands within the rock and a texture that lacks such layering or banding.
Sedimentary and igneous rocks began as something other than rock. Metamorphic rocks is foliation. It can be equally applied to surfaces that may be relict bedding or to surfaces that are purely the consequence of deformation andor recrystallization.
A foliated rock is a metamorphic rock with a texture that gives the rock a layered appearance. These rocks form under the action of pressure volume and temperature PVT changes. Contact metamorphism occurs when hot magma transforms rock that it contacts.
Metamorphism happens when an existing rock finds itself under great heat and. Metamorphic rocks are formed igneous and sedimentary rocks undergo changes due to extreme heat and pressure. Metamorphic texture is the description of the shape and orientation of mineral grains in a metamorphic rock.
Be neath or beside each picture briefly note the most distinctive. Most metamorphic rocks are L-S tectonites that form from a more general strain history. You will sort metamorphic rocks into categories that describe their overall patterns and then label metamorphic rocks with the materials they contain.
Metamorphism takes place when rocks are forced down to lower levels by tectonic processes or when molten magma rising through the crust comes in contact with the crustal rocks or the underlying rocks are subjected. Contact or regional metamorphism. Metamorphic rocks arise from the transformation of existing natural rock substances to new types of rock without any exterior liquefaction manually done in a process called metamorphism.
Metamorphic Rock Inquiry Name. Describe a metamorphic rock. Rocks with purely planar fabrics are called S tectonites and form by a flattening deformation oblate strain ellipsoid.
They are usually formed from high temppressure and can be sub devided into foliation and non foliation. Metamorphic rocks form when heat and pressure transform an existing rock into a new rock. The process of metamorphism does not melt the rocks but instead transforms them into denser more.
Metamorphic rock is formed under extreme heat or pressure Unlike other types of rock metamorphic rocks start as rocks which are then transformed into different rocks Metamorphic rocks are classified as either foliated or non foliated depending on their mineral structure and pattern. A metamorphic rock was once a sedimentary rock but under heat and. Sedimentary igneous and metamorphic.
Metamorphic rocks are rocks that have been changed. 7 rows Metamorphic Rocks Metamorphic rocks changed rocks are made when existing rocks are subjected to high temperatures and high pressures for long periods of time. A foliation formed by platy minerals such as mica.
Metamorphic rocks that are not layered are called massive or. Metamorphic rocks form one of the three great divisions of rock types. Foliation - Any layering in a metamorphic rock.
Analyze the metamorphic rocks in Fig. You might have seen the word metamorphism used to describe how a caterpillar changes into a butterfly. They are commonly classified into three categories based on how they form.
Changes occur in the solid state because melting doesn t occur. During metamorphism new minerals grow at the expense of old minerals andor the shape size and arrangement of grains in the rock may change. Most commonly used to describe low-grade micaceous pelitic rocks such as.
Part A - Textures of Metamorphic Rocks Metamorphic rocks have two basic types of textures. Learning Goal You will analyze and describe samples of metamorphic rock and then consider how they might be classified into logical groups A. Metamorphic rocks may change so much that they may not resemble the original rock.
Examples of metamorphic rocks are marble slate quartzite gneiss etc. In the rock cycle there are three different types of rocks. Metamorphic rock forms from a pre-existing rock or protolith.
Rocks that undergo a change to form a new rock are referred to as metamorphic rocks.
Rock On Metamorphic Rocks Science Classroom Fun Science
Pin On Crystal Magick
Pin On Crystals
0 Comments