- Study guides, Class notes & Summaries

Petrology Exam 2 Practice Questions What is done to a sample - ANSWERSA sample is bombarded by energy What happens to electrons in elements of a sample - ANSWERSelectrons absorb the energy and are excited, and move from levels near the nucleus of an atom to higher energy levels How is the identity of an element determined from the detector - ANSWERSUpon de-excitation the electrons fall back to the ground state by releasing energy, and the wavelength, or frequency of the released energ...

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4 pages

Written in 2024/2025

Grade A+

Bensuda

Petrology Test 1 Questions & Answers Classification of any rock is based on what - ANSWERStexture and composition IUGS classification of Pyroclastic Rocks - ANSWERSclassification based on clast size/type. >64 mm - blocks (solid rock during fragmentation) or bombs (molten rock during fragmentation) 2-64 mm - Lapilli < 2 mm - Ash IUGS classification system of Aphanitic (volcanic) rocks. - ANSWERSIf modal comp cannot be determined by hand sample/thin section - analyze the ...

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8 pages

Written in 2024/2025

Grade A+

Bensuda

Petrology Exam Study Questions & Answers What is the dominant process for producing melt in the mantle? - ANSWERSDecompressional melting, where the pressure is lower while the temperature stays constant, moving the mantle up to and over the solidus. How do a suite of igneous rocks become more felsic? - ANSWERSFractional crystallisation. What determines whether a magma is tholeiitic or calc-alkaline? - ANSWERSThe amount of melting; small melts of basalt can be alkalic, but large amount...

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7 pages

Written in 2024/2025

Grade A+

Bensuda

Petrology Midterm Emplacement - ANSWERSWhere igneous rocks form Plutonic - ANSWERSIgneous rocks formed underground Shallow/Epizonal <5km Middle/mesozonal 5-15km Deep/catazonal >15km Volcanic - ANSWERSIgneous rocks formed at the surface, dispersal near to far from vent, Can be lava or pyroclastic Hypabyssal(subvolcanic) - ANSWERSIgneous rocks w/ textural characteristics like volcanic rocks but emplaced in plutonic setting, shallow <1-2km Igneous textures descriptor...

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10 pages

Written in 2024/2025

Grade A+

Bensuda

Petrology Exam 1 Questions Grade A+ What minerals are needed to identify an igneous rock? - ANSWERSF-feldspathoid Q- quartz A- alkali feldspar P- plagioclase Clinopyroxene and Orthopyroxene How is igneous grain size related to the igneous setting where a rock formed? - ANSWERSSlow cooling= Large grains. Coarse-grained. Phaneritic. Intrusive Fast cooling= Small grains. Fine-grained. Aphanitic. Extrusive porphyritic= two-stage cooling process. Phenocryst in a fine matrix. what...

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11 pages

Written in 2024/2025

Grade A+

Bensuda

Petrology Exam 1 Material Questions & Answers

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2 pages

Written in 2024/2025

Grade A+

Bensuda