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British Virgin Islands Daria Jones

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Virgin Gorda, BVI James O'Brien

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SEDIMENTATION AND SEDIMENTARY ROCKS DEPOSITIONAL or SEDIMENTARY ENVIRONMENTS Analysis of sedimentary shake can give hints to their DEPOSITIONAL ENVIRONMENT . Can then be utilized to translate geologic history of a region. Can incorporate Continental situations Transitional situations Marine situations

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SEDIMENTATION AND SEDIMENTARY ROCKS DEPOSITIONAL or SEDIMENTARY ENVIRONMENTS Continental Environments Found on landmasses. Most silt are clastic. Incorporate paleocurrent direction or pointers. Plant and freshwater fossils common. Incorporates streams, lakes, holes, deserts and icy masses.

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SEDIMENTATION AND SEDIMENTARY ROCKS DEPOSITIONAL or SEDIMENTARY ENVIRONMENTS Transitional Environments Occur at limit amongst ocean and land. A few dregs are clastic, some are natural. Affected by tides, streams, and breaking waves. Incorporates estuaries, deltas, beaches and tidal ponds.

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SEDIMENTATION AND SEDIMENTARY ROCKS DEPOSITIONAL or SEDIMENTARY ENVIRONMENTS Marine Environments Entirely maritime situations. Most residue are clastic, some are natural. Fluctuate as per profundity of water. Shallow marine < 200 m. Limit band along mainland. Sandstone, mudstone, limestone Deep marine - seaward. Fine-grained wind blown muds and natural, calcareous or siliceous slimes.

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SEDIMENTATION AND SEDIMENTARY ROCKS DEPOSITIONAL or SEDIMENTARY ENVIRONMENTS Shallow Marine Environments

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SEDIMENTATION AND SEDIMENTARY ROCKS DEPOSITIONAL or SEDIMENTARY ENVIRONMENTS Deep Marine Environments

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SEDIMENTATION AND SEDIMENTARY ROCKS DEPOSITIONAL or SEDIMENTARY ENVIRONMENTS Deep Marine Environments

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SEDIMENTATION AND SEDIMENTARY ROCKS SEDIMENTARY FACIES Adjacent sedimentary or depositional situations produce distinctive residue and shake sorts. While distinctive, they are saved in the meantime. Speaks to a flat continuum. The flat changes show the fluctuation of the contiguous situations. Vertical changes reflect how situations have changed after some time.

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SEDIMENTATION AND SEDIMENTARY ROCKS SEDIMENTARY FACIES

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SEDIMENTATION AND SEDIMENTARY ROCKS SEDIMENTARY FACIES Walther's Law of Succession of Facies Sedimentary facies move as natural conditions change. Position of the shoreline will fluctuate as position of ocean level changes. Neighboring facies will stack up vertically after some time.

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SEDIMENTATION AND SEDIMENTARY ROCKS SEDIMENTARY FACIES

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SEDIMENTATION AND SEDIMENTARY ROCKS DIFFERENCES IN CLIMATE AND WEATHERING Arid Regions Sandstones and Limestones deliver precipices. Mudrocks make up slants. Muggy Regions Sandstones create precipices Mudrocks and limestones make up slants

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SEDIMENTATION AND SEDIMENTARY ROCKS DIFFERENCES IN CLIMATE AND WEATHERING Slopes in Arid Regions

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SEDIMENTATION AND SEDIMENTARY ROCKS DIFFERENCES IN CLIMATE AND WEATHERING Slopes in Humid Regions Kope Formation, OH Showangunks, NY

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Maine Geological Survey July 2002, Site of the Month

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METAMORPHISM AND METAMORPHIC ROCKS All stones are defenseless to transformative nature. Change happens in light of conditions influencing them.

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METAMORPHISM AND METAMORPHIC ROCKS METAMORPHIC ROCKS Generally shape at conditions between those that frame igneous and sedimentary rocks. Changeability is the procedure by which warmth, weight, and compound responses somewhere down in the Earth adjust the mineral substance as well as structure of previous shake without liquefying it .

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METAMORPHISM AND METAMORPHIC ROCKS Most are covered underneath layers of sedimentary rocks. Forms occur somewhere down in the Earth. Conveyed to the surface by tectonics and disintegration. A large portion of what we think about transformative nature and metamorphic rocks originates from lab tests.

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METAMORPHISM AND METAMORPHIC ROCKS What Drives Metamorphism? Rocks and minerals are most steady at the conditions under which they shape. Development of rocks causes dangers to exist. New minerals and rocks are framed in a attempt to wind up stable. Increment the measure of progress, transformative nature happens. Create muds by weathering With transformative nature, mud are adjusted to wind up micas with expanding warmth and weight.

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METAMORPHISM AND METAMORPHIC Rocks stay strong amid transformative nature . Minerals get to be temperamental amid transformative nature . Bonds soften up minerals permitting the creation of new minerals, stable at new conditions. Not every one of the bonds break, that would liquefy . Dissemination of particle rich liquids upgrades the development within a stone experiencing changeability. The force of water strikes once more. Sythesis of the parent shake additionally impacts the metamorphic shake that structures.

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METAMORPHISM AND METAMORPHIC ROCKS METAMORPHISM is the change of strong rock to frame new minerals and surfaces. Quartz will remain quartz, yet size and shape may change. Dirts separate and components and particles recombine to shape new minerals. With enough warmth, molecules and particles can move inside a rock to frame new minerals. Creation of the stone may finish what has been started, yet the minerals and surface may change.

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METAMORPHISM AND METAMORPHIC ROCKS FACTORS INFLUENCING METAMORPHISM HEAT Most vital calculate driving transformative nature. Quickens the pace of most synthetic responses. Warm increments with profundity in the Earth Thermal Gradient 20-30 C/kilometer profundity 74 F/mile profundity Rocks at profundity are dependably at higher temperature. Rocks and minerals that shape there are steady.

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METAMORPHISM AND METAMORPHIC ROCKS FACTORS INFLUENCING METAMORPHISM HEAT Moving rocks from the surface to profundity causes increment in warm and transformative potential. Hotspots for Increase in Heat Tectonic action pushes shake from surface to profundity. Dregs get covered. Contact with magma.

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METAMORPHISM AND METAMORPHIC ROCKS FACTORS INFLUENCING METAMORPHISM Heat in the covering is delivered by: Decay of radioactive isotopes Upward conduction of warmth from the mantle Friction from subduction Heat vital for changeability is not achieved until a profundity of 10 kilometers (6 miles). To happen at the surface it requires contact with rising magma.

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