Геохимия лекции
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vk.com/club152685050 | vk.com/id446425943 |
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0.9 |
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0.8 |
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атомов |
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0.6 |
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Количество |
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0.4 |
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T1 2 |
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0.2 |
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0.1 |
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Время |
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vk.Цепочкиcom/club152685050 | vkрадиоактивных.com/id446425943 превращений
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DN |
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N1 N2 |
N3 |
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N − N |
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DN1 − N |
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DT |
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DT |
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N N0 |
EXP(− T), где |
N0 |
N |
при |
T 0 |
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DN2 |
N0 |
EXP(− T)− N |
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DT |
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N |
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N0[EXP(− T)− EXP(− T)]+ N0 |
EXP(− T) |
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− 1 |
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если N0 |
0 |
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vk.com/club152685050 | vk.com/id446425943
vk.com/club152685050Изотопные| vk.com/id446425943системы, используемые
в геохронологии
• U-Th-Pb |
238U 206Pb 235U 207Pb 232Th 208Pb |
|
• |
Rb-Sr |
87Rb 87Sr+β- |
• |
Sm-Nd |
147Sm 143Nd+α |
• |
Lu-Hf |
176Lu 176Hf+β- |
• |
Re-Os |
187Re 187Os+β- |
• |
K-Ar |
40K 40Ar+β+ |
• |
K-Ca |
40K 40Ca+β- |
•Радиоуглерод
•Pt-Os, U-Th-He и др.
vk.com/club152685050 | vk.com/id446425943
Общая геохимия
Лекция 6 Изотопная геохимия. Общие вопросы
(изотопы, радиоактивный распад)
vk.com/club152685050Зачем| vkнужна.com/id446425943изотопная геохимия?
vk.com/club152685050 | vk.com/id446425943Литература
1986
1989
2006
vk.com/club152685050 | vk.com/id446425943Литература
1993 2001 2007