Metamorphic Rock Research Paper

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Next, we can see that the rock displays a subtle porphyritic texture with plagioclase comprising the phenocrysts. The overall texture of the surrounding groundmass is granoblastic equigranular. Under thin section we also see a weakly defined foliation evidenced in the preferential alignment of actinolite grains and to a lesser extent chlorite grains. Undulose extinction is also observed in quartz indicating the rock was subject to deformation. The normalized quartz, alkali-feldspar, and plagioclase (QAP) values of this rock indicate that it is classified as a grano-diorite according to the IUGS QAPF classification system which is consistent with the hand sample interpretation.

The event of September of 1957 Arkansas was part of a movement that change the world as we know starting with The Little Rocks Nine. Nine African American students were placed in a white only school district in hope to merging into a better enhancement and transformation of a country that isn’t a reflection of racial inequalities and segregation. Meanwhile, it was an event that was fought and rebel against by many white officials and citizens in effort block these students from entering the schools because it was in the era's when the Jim Crows were still in effect. Many couldn’t accept revolution because they were content with where its stood then Therefore, bigotry behavior was accepted and consider reasonable. However, all African American

Metamorphic rocks are the result of the transformation of a pre-existing rock type, the protolith, in a process called metamorphism, which means "change in

“Metamorphic Rocks.” Living With Volcanic Past. http://vulcan.wr.usgs.gov/LivingWith/VolcanicPast/Notes/metamorphic_rocks.html (accessed May 23, 2012). Oregon Bureau of Mines and Geology. The Mineral Resources of Oregon.

Regional metamorphism of slate from mudstone occurred due to changes in temperature and pressure over an area of the crust. Orogenesis (mountain building) due to the collision of continents lead to increased pressure and temperature. (Rock Library, 2016) The mountain grew and its base melted due to the intense heat; this magma invaded the original slate and formed a granite intrusion. This happened underground millions of years ago and after weathering it is now visible from the surface. (Devon County Council, 2016) The Dartmoor granite was intruded into Devonian and Carboniferous sandstones, limestones, shales and lavas.(Woods, S. 1988) These neighbouring country rocks were altered, resulting in the development of many types of metamorphic rocks, which form an aureole around the granite. (Keene, P. 2001)

Gone are the ages where geological events were shaped by animals, climate, and other forces. Today, much of the earth’s activities involve acquiring of energy and utilization of resources used not only to survive but also to thrive in a way that no species has done before in history. Jessica Abramovic’s posting has outlined how several natural resources such as forests, minerals, and water have been utilized as energy sources to the point of near depletion in many parts of the world. The anthropogenic period has been marked by significant human influence, which has for the few thousands of years affected the overall geological make-up of the earth. Natural events such as earthquakes, volcanic eruptions, hurricanes do not come close to affecting the earth in the way that human activities to today (Steffen et al, 2011; Ellis, 2011). What is more interesting is the fact that humans have lived on earth for only a few hundred thousand years, but have become a geologically dominant species within that time as compared to the estimated 4.5 billion years of earth’s existence.

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Metamorphic rocks change based upon heat, pressure, and chemical processes. Sedimentary rocks change into metamorphic rocks by withstanding heat, pressure, or by chemical action. Igneous rocks change by weathering and erosion. Metamorphic rocks can change into igneous rocks by experiencing melting and cooling. Sedimentary rocks change by weathering and erosion. Sedimentary rocks are formed by the accumulation of sediments and other fragments. When utilizing the rock cycle igneous rocks can change into both sedimentary rocks and metamorphic rocks when experiencing weathering and erosion. Igneous rocks are formed from the volcanic magma that cools and hardens on the surface of the earth.

The objective of this paper is to inform, and educate one in the origin of pseudotachylite and its parent rock for which it intruded. Pseudotachylite derives from early 1900 's when it was describe as glassy metamorphosed rock that was “almost a tachtylite” (Superfaults and Pseudotachylite). When a group of children slide down a snowy hillside on a wintry day, a process known as frictional melting is happening underneath them. At first, they cannot gain enough speed to fulfill their excitement because of the loosely packed snow. Eventually, their track that they have used over and over again becomes packed down and looks somewhat more glossy than the snow. Their tracks are frictional melting. As the weight of their sled is pushed downward by gravity to the snow-packed embankment, the cold dry snow is heated up by the energy of the two masses rubbing together and the snow melted quickly and was released to the atmosphere after the sled passed over. In geology, the sled and snow are replaced with plate boundaries that cover the earth (Mcgoughlin, 1992).

Contact metamorphic rocks form when other rocks come into contact with heat; magma. The convection currents in the mantle, that causes the magma to rise are also in contact with other surrounding rocks. The hot magma changes the formation of surrounding rocks and turn into a contact metamorphic rocks. A regional metamorphic rock is formed by the heat and pressure of the tectonic plate movement.How to tectonic plate move? They move because of the convection currents in the Earth's mantle.The rocks material in the Earth's mantle are in a constant circular motion,that eventually move the plates. When two plates collided they create heat and pressure in between each other and cause rocks to

Marble is made up by the regional metamorphism of dolomite and limestone rock. A lot of pressure applied to the limestone over a very long period of time form marble. High temperature and pressure turns limestone crystal into smaller, finer and harder crystals. Extended duration of metamorphism process grows crystal size larger and becomes easily recognizable interlocking

What are the properties/ characteristics of the rock? (With links to formation): It is a mafic extrusive (formed when magma makes its way to the earth’s surface) rock. It contains more than 90% of all volcanic rocks. Due to its low silica content basalt lava has a comparatively low viscosity,

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     Metamorphic rocks are pre-existing rocks that are changed by heat and pressure. The pre-existing rock is called the parent rock, or protolith. Metamorphism occurs in these rocks when the minerals become instable. There are two types of metamorphism, contact and regional. Contact is high temperature, low pressure. It is basically a massive rock that is baked. Regional is high pressure and low temperature. Strong fabric, or layering, develops from