What Type of Plate Boundary Is Associated With Regional Metamorphism

Metamorphism occurs when solid rock changes in composition andor texture without the mineral crystals melting which is how igneous rock is generated. The Chile Ridge also known as the Chile Rise is a submarine oceanic ridge formed by the divergent plate boundary between the Nazca Plate and the Antarctic PlateIt extends from the triple junction of the Nazca Pacific and Antarctic plates to the Southern coast of Chile.

Regional Metamorphism Subduction Zone Metamorphic Subduction

- divergence - convergence - subduction.

. A pluton causes metamorphism in a small surrounding region. The Chile Ridge is easy to recognize on the map as the ridge is divided into several segmented fracture. Just over half of estimated oil reserves are found associated with rifts containing marine syn-rift and post-rift sequences just under a quarter in rifts with a non-marine syn-rift and post-rift and an eighth in non-marine syn-rift with a marine post-rift.

The subduction type of regional metamorphism is associated with subduction of an oceanic plate underneath a continent and results in rocks formed at high pressure and relatively low temperatures blueschist eclogite. Using what you know about how each rock type forms determine the rock type for each of your unknown samples and fill in Table 24. - earthquakes other boundary.

Regression of the sea leads to erosion of sedimentary cover atop a body of rock c. Exercise 23- Identifying Types of Rocks. Which of the following variables could influence the width of marine magnetic anomalies on the floor of the ocean.

Regional metamorphism occurs where large areas of rock are subjected to large amounts of differential stress for long intervals of time conditions typically associated with mountain building. The Ordovician metamorphism is associated with accretionary event along the northern Gondwana margin. Basic igneous rocks basalt gabbro volcanogenic rocks together with clay-bearing clastic sediments are the dominant protolithic materials.

Polyphase metamorphism is observed in the Baoban Complex Hainan Island. Rate at which the plates are moving. Mountain building occurs at subduction zones and at continental collision zones where two plates each bearing continental crust converge upon each other.

Dynamothermal regional metamorphism occurs when _____. Effective regional seals may be present within the post-rift sequence if mudstones or evaporites are deposited. Texture crystal size and structure grain size layering phenocrysts fossils.

Regional metamorphism also takes place in this setting and because of the extra heat associated with the magmatic activity the geothermal gradient is typically steeper in these settings between 40 and 50 Ckm. SIMS zircon U-Pb geochronological dating yielded a metamorphic age of 462 Ma. The upper surface of a body of rock develops a thick soil profile d.

The peak metamorphic conditions are 715650 C091086 GPa. Extrapolation of the role of plate tectonics further back into the Archean or into the Hadean is hindered by the paucity of the rock record apart from a few regional remnants eg Isua greenstone belt Acasta Gneiss Nuvvuagittuq greenstone belt along with mineral fragments detrital zircons and their inclusions of appropriate age eg Jack Hills of the Narryer Gneiss. Rock becomes buried deeply during continental collision and mountain building b.

Describe rocks using the following terms. Sort the following processes those likely to be related to a transform boundary or those likely associated with other boundary types. The Mapping of Geological Structures Geological Society of London Handbookpdf.

Metamorphism often results in some type of pattern or orientation to the minerals called foliation. Table 24 Worksheet for Exercise 23. 61 Metamorphic Processes.

Because metamorphism is caused by plate tectonic motion metamorphic rock provides geologists with a history book of how past tectonic processes shaped our planet. Describe how a rang. Under these conditions higher grades of metamorphism can take place closer to surface than is the case in other areas.

Your instructor will provide you with a selection of unknown rocks.

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