![]() ![]() This DVD is for knappers who want to learn flintknapping. They can cause increased pressure and form breccias.Made from Brier creek chert (aka agate). Transform boundaries don't affect metamorphic Metamorphism around igneous rocks or hydrothermal metamorphism from fluidsĬirculating in the ocean crust. Divergent settings typically have contact Or metamorphic rocks (blueschist and eclogite, low How do you relate metamorphic rocks to various tectonic settings? Continental convergent settings have slate-phyllite- schist-gniess-migmatie sequence. What minerals are present What are sources of heat, pressure and fluids? Burial in the earth (increases pressure and heat) -convergent plate boundary causes increased burial(pressure), -divergent plate boundary causes increased heat as the asthenosphere is moved closer to the earth's surface -fluids come from pore space as well as as mineral reactions as minerals loose water and carbon dioxide as they are heated. On land, evaporates are dried up oceans and lakes -limestones are usually in marine settings, etc How do you classify metamorphic rocks? presence or absence of foliation (regional or contact metamorphism) what was the parent rock (or protolith) Wind (eolian) marine sedimentary environments Shallow (to about 200 meters)ĭeep (seaward of continental shelves) How would you distinguish different sedimentary environments such as marine and continental? If it has hematite (makes rock red colored), it was deposited on a continent.įossil content (plants = land, shells = marine), rounding (as angular = not transported far on land) -type of chemical sediment as coals only Continental sedimentary environment Dominated by stream erosion and deposition chemical sed rocks usually form from precipitation of minerals at the earth's surfaceĬompared to detritral which are formed form transported minerals and rock fragments. coquina and chalk r biochemical limestone chemical sedimentary rocks derived from ions that r carried in solution to lakes and seas Compare and contrast chemical and detrital sedimentary rocks. forms mainly in shallow, warm ocean settings Natural cements, which include calcite, silica, and iron oxide cementation crystallization of minerals among individual sediment grains alluvial fan consists of coarse sediments that r deposited when mountain streams reach flat lowlands eolian wind blown sand limestone inorganic limestone forms when chemical changes increase the calcium carbonate content of the water until it precipitates ![]() Occurs within the upper few kilometers of Earth's crust lithification Lithification-sediments are transformed into solid rock by: Rock gypsum and rock salt and are two common evaporites mudstone chunks or blocks of rock diagenesis chemical, physical, and biological changes that take place after sediments are deposited Occasionally, evaporites form on salt flats when dissolved materials are precipitated as a white crust on the ground ![]() Ooids form as tiny "seeds" roll in shallow marine water supersaturated with calcium carbonate evaporite -Form when restricted seaways become over-saturated and salt deposition starts Flint (black), jasper (red), chert arrowhead, petrified wood oolite -limestone is composed of small spherical grains called ooids Forms when dissolved silica precipitates ![]() tidal flats, shallow lakes, desert basins chalk made up mostly of hard parts of microscopic marine organisms chert -Composed of microcrystalline quartz when exposed to air, wet mud dries out and shrinks associated with submarine currents known as turbidity currents mud cracks -reveals that the environment was alternatively wet nd dry precipitated when the water in the cave loses carbon dioxide fissile meaning the rock can be split into thin layers graded beds -characterized by a decrease in sediment size from bottom to top. Bituminous clastic rocks composed of broken pieces of older rocks travertine -type of limestone found in caves Organic Sedimentary Rocks coal (composed of organic material stages of coal formation 1. ![]()
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