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D. Zircon (ZrSiO,) forms in magma and lava as it cools into igneous rock. It is also useful for absolute age dating (Figure 8.10). 1. If you walk on a modern New Jersey beach, then you will walk on some zircon sand grains. Yet if you determine the absolute age of the zircons, it does not indicate a modern age (zero years) for the beach. Why? 2. Suggest a rule that geologists should follow when they date rocks according to radiometric ages of crystals inside the rocks.

D. Zircon (ZrSiO,) forms in magma and lava as it cools into igneous rock. It is also useful for absolute age dating (Figure 8.10). 1. If you walk on a modern New Jersey beach, then you will walk on some zircon sand grains. Yet if you determine the absolute age of the zircons, it does not indicate a modern age (zero years) for the beach. Why? 2. Suggest a rule that geologists should follow when they date rocks according to radiometric ages of crystals inside the rocks.

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
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D. Zircon (ZrSiO,) forms in magma and lava as it cools into igneous rock. It is also useful for absolute age dating (Figure 8.10). 1. If you walk on a modern New Jersey beach, then you will walk on some zircon sand grains. Yet if you determine the absolute age of the zircons, it does not indicate a modern age (zero years) for the beach. Why? 2. Suggest a rule that geologists should follow when they date rocks according to radiometric ages of crystals inside the rocks.
Transcribed Image Text:D. Zircon (ZrSiO,) forms in magma and lava as it cools into igneous rock. It is also useful for absolute age dating (Figure 8.10). 1. If you walk on a modern New Jersey beach, then you will walk on some zircon sand grains. Yet if you determine the absolute age of the zircons, it does not indicate a modern age (zero years) for the beach. Why? 2. Suggest a rule that geologists should follow when they date rocks according to radiometric ages of crystals inside the rocks.
SOME ISOTOPES USED FOR RADIOMETRIC DATING Daughter Isotope (D) Half-Lives (T½) Useful Dating Range Parent Isotope (P) Materials Dated Newly formed crystal Uranium-238 4.5 billion years Zircon 713 million years Zircon Lead-206 ages > 10 m.y. 100 Uranium-235 Lead-207 ages > 10 m.y. 0000000o o00000 15.9% decayed to daughter Potassium-40 Argon-40 Biotite, muscovite, whole volcanic rock 1.3 billion years ages > 50,000 yr Shells, limestone, organic materials ages 100-60,000 yr Carbon-14 Nitrogen-14 5730 years 84.1 29.3% decayed 70.7 Parent Atoms (P) 000000000e 50% decayed RADIOACTIVE DECAY 50.0 Daughter Atoms (D) 25.0 75% decayed 87.5% decayed 12.5 93.8% decayed 96.9% decayed 6.2 3.1 14 2 3 4 5 6 Half-Lives (T1) Elapsed DECAY PARAMETERS FOR ALL RADIOACTIVE DECAY PAIRS Percent of Parent Atoms (P) Percent of Daughter Atoms (D) Half-Lives Elapsed Age 0.000 x T 0.015 x T 0.031 x Ty 0.062 x Ty 0.125 x T 0.250 x T 0.500 x T2 1.000 x Ty2 100.0 0.0 98.9 1.1 1/64 97.9 2.1 1/32 95.8 4.2 1/16 91.7 8.3 1/8 84.1 15.9 1/4 70.7 29.3 1/2 50.0 50.0 1 1'½ 1.500 x T, 2.000 x T 3.000 x T 4.000 x Ty 5.000 x Ty2 35.4 64.6 25.0 75.0 2 12.5 87.5 3 6.2 93.8 4 3.1 96.9 Percent of Parent (P) Atoms Remaining
Transcribed Image Text:SOME ISOTOPES USED FOR RADIOMETRIC DATING Daughter Isotope (D) Half-Lives (T½) Useful Dating Range Parent Isotope (P) Materials Dated Newly formed crystal Uranium-238 4.5 billion years Zircon 713 million years Zircon Lead-206 ages > 10 m.y. 100 Uranium-235 Lead-207 ages > 10 m.y. 0000000o o00000 15.9% decayed to daughter Potassium-40 Argon-40 Biotite, muscovite, whole volcanic rock 1.3 billion years ages > 50,000 yr Shells, limestone, organic materials ages 100-60,000 yr Carbon-14 Nitrogen-14 5730 years 84.1 29.3% decayed 70.7 Parent Atoms (P) 000000000e 50% decayed RADIOACTIVE DECAY 50.0 Daughter Atoms (D) 25.0 75% decayed 87.5% decayed 12.5 93.8% decayed 96.9% decayed 6.2 3.1 14 2 3 4 5 6 Half-Lives (T1) Elapsed DECAY PARAMETERS FOR ALL RADIOACTIVE DECAY PAIRS Percent of Parent Atoms (P) Percent of Daughter Atoms (D) Half-Lives Elapsed Age 0.000 x T 0.015 x T 0.031 x Ty 0.062 x Ty 0.125 x T 0.250 x T 0.500 x T2 1.000 x Ty2 100.0 0.0 98.9 1.1 1/64 97.9 2.1 1/32 95.8 4.2 1/16 91.7 8.3 1/8 84.1 15.9 1/4 70.7 29.3 1/2 50.0 50.0 1 1'½ 1.500 x T, 2.000 x T 3.000 x T 4.000 x Ty 5.000 x Ty2 35.4 64.6 25.0 75.0 2 12.5 87.5 3 6.2 93.8 4 3.1 96.9 Percent of Parent (P) Atoms Remaining
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