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105-16 9-30 Absolute rock dating, metamorphic rx

105-16 9-30 Absolute rock dating, metamorphic rx - mean...

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F D C- D C C+/B- B B+/A- A 34 42,44 50 56 66 70 78 82 90 100 % GEOL. 105 EXAM #1 9/26/2011 GRADE RESULTS mean, median score
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GEOL. 105L 9/3/2011 G. A. DAVIS
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p p p Atomic mass not changed much; atomic number increases by 1 because Neutron becomes proton (b) Beta decay Beta particle Radioactive parent nucleus Decay process Daughter nucleus Atomic mass not changed much; atomic number decreases by 1 (c) Electron capture Beta particle Atomic mass decreases by 4; atomic number decreases by 2 (a) Alpha decay Alpha particle Proton Neutron p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p Emission of 2 protons and 2 neutrons (alpha particle) An electron (beta particle) is ejected from the nucleus electron combines with a proton to form a neutron
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Using radioactivity in dating Parent – an unstable (radioactive) isotope Daughter product –an element resulting from decay of parent (it may also be unstable) Half-life – time required for one-half of the parent isotope in a sample to decay into the daughter product
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HALF-LIFES OF MAJOR RADIOACTIVE ELEMENTS IODINE - 131 ~ 8 DAYS STRONTIUM - 90 28 YEARS PLUTONIUM - 239 24,000 YEARS URANIUM - 235 713,000,000 YEARS URANIUM - 238 4,500,000,000 YEARS CARBON - 14 5730 YEARS
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N loses e —> P with same atomic # Carbon -14 Nitrogen - 14
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Mt. Mazama’s caldera collapse, ca. 5667 ± 150 years BC [C 14 ]
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Mt. Mazama’s caldera collapse, ca. 5667 ± 150 years BC [C 14 ]
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Metamorphism & Metamorphic Rocks GEOL 105 9/30/2011 G. DAVIS
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ROCKS AND THE ROCK CYCLE: METAMORPHISM AND METAMORPHIC ROCKS
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Metamorphic rocks If pre-existing rocks
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