re-os и pt-os системы. =1.666×10 –11 год –1 =1.666×10 –11 год –1 (smoliar...
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![Page 1: Re-Os и Pt-Os системы. =1.666×10 –11 год –1 =1.666×10 –11 год –1 (Smoliar et al., 1996) at % AW 184 Os 0.018%190.21 186 Os 1.584% 187 Os 2.400%](https://reader036.vdocuments.mx/reader036/viewer/2022062423/5697bfc31a28abf838ca562c/html5/thumbnails/1.jpg)
Re-Os и Pt-Os системы
![Page 2: Re-Os и Pt-Os системы. =1.666×10 –11 год –1 =1.666×10 –11 год –1 (Smoliar et al., 1996) at % AW 184 Os 0.018%190.21 186 Os 1.584% 187 Os 2.400%](https://reader036.vdocuments.mx/reader036/viewer/2022062423/5697bfc31a28abf838ca562c/html5/thumbnails/2.jpg)
QOs 18776
18775Re
l187=1.666×10–11 год–1 (Smoliar et al., 1996)
at %% AW184Os 0.018%
190.21
186Os 1.584%187Os 2.400%188Os 13.176%189Os 16.058%190Os 26.146%192Os 40.617%
192Os/188Os3.0827185Re 37.07%
186.21187Re 62.93%190Pt 0.01296%
195.08
192Pt 0.8017%194Pt 32.934%195Pt 33.799%196Pt 25.215%198Pt 7.240%
194Pt/195Pt0.9744
1998)Walker,(Shirey,
40186.0Re
1270.0
188
187
188
187
CHUR
CHUR
Os
OsOs
?ReRe
188
187
ATW OsOs
QOsPt 18676
19078
l190=1.477×10–12 год–1 (Begemann et al., 2001)
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1001
188
187
188
187
T
CHUR
T
SampleOs
OsOs
OsOs
]1)[exp(Re
188
187
0188
187
188
187
t
OsOsOs
OsOs
![Page 4: Re-Os и Pt-Os системы. =1.666×10 –11 год –1 =1.666×10 –11 год –1 (Smoliar et al., 1996) at % AW 184 Os 0.018%190.21 186 Os 1.584% 187 Os 2.400%](https://reader036.vdocuments.mx/reader036/viewer/2022062423/5697bfc31a28abf838ca562c/html5/thumbnails/4.jpg)
CHUR
Crust
Mantle
0.0
0.2
0.4
0.6
0.8
1.0
1.2
0 1 2 3 4
T, млрд.лет
187Os188Os
![Page 5: Re-Os и Pt-Os системы. =1.666×10 –11 год –1 =1.666×10 –11 год –1 (Smoliar et al., 1996) at % AW 184 Os 0.018%190.21 186 Os 1.584% 187 Os 2.400%](https://reader036.vdocuments.mx/reader036/viewer/2022062423/5697bfc31a28abf838ca562c/html5/thumbnails/5.jpg)
Walker R.J. et al., 1997.Geochimica et Cosmo-chimica Acta. V. 61.P.4799-4807.
T=251.2±0.3 My(Kamo et al., 1996)
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0.0
0.5
1.0
1.5
2.0
0 200 400 600 800 1000 1200 1400 1600
187Re/188Os
187Os188Os
T=65.5±0.8 Ma
(187Os/188Os)0=0.1285±23MSWD=7
Allegre C.J., Birck J.L., et al. Age of the Deccan Traps Using Re-187-Os-187 Systematics. // Earth and Planetary Science Letters. 1999. 170(3): 197-204.
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Повторные анализы двух образцов ренита (ReS2) с вулкана Кудрявый (о.Итуруп).
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Fig. 3 Photographs of ore veins from the Yaogangxian tungsten deposit, South China.a - Quartz–molybdenite ore vein.b - Quartz–molybdenite ore vein.c - Quartz–feldspar–phlogopite–sulfide vein. d - Quartz–muscovite vein
Jiantang Peng, Mei-Fu Zhou, Ruizhong Hu, Nengping Shen, Shunda Yuan, Xianwu Bi, Andao Du, Wenjun Qu.
Precise molybdenite Re–Os and mica Ar–Ar dating of the Mesozoic Yaogangxian tungsten deposit, central Nanling district, South ChinaMinerlium Deposita (2006) 41: 661–669
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Fig. 4 187Re–187Os isochron diagram for eight molybdenite samples from the Yaogangxian tungsten deposit, South China
Fig. 5 40Ar/39Ar age spectrum for phlogopite (a) and muscovite (b) from the Yaogangxian deposit, South China
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Задача 18.Рассчитать возраст молибденита, в котором обнаружены Re и 187Os в следующих количествах:
Вариант Re, % 187Os, ppm Вариант Re, % 187Os, ppm1 1.702 275.79 21 0.115 21.742 0.825 136.35 22 1.813 340.843 0.689 71.66 23 1.39 274.894 1.74 214.52 24 1.485 119.555 0.401 94.58 25 1.085 90.826 1.392 147.75 26 1.753 358.107 1.622 201.71 27 0.152 31.228 1.921 486.71 28 1.105 173.099 1.664 325.46 29 0.824 150.4510 1.981 115.21 30 1.964 191.6611 0.434 75.95 31 1.633 303.4612 1.048 68.75 32 1.218 134.5013 1.66 406.05 33 1.983 165.9914 0.257 24.26 34 0.53 108.8415 0.253 51.68 35 0.312 48.8716 1.551 100.09 36 0.401 41.7017 0.197 37.25 37 1.981 501.9118 0.546 38.14 38 0.253 61.8919 0.587 151.94 39 1.907 133.2120 1.907 165.73 40 1.085 214.57
AW187Os=186.956
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Puchtel I.S., Brugmann G.E., et al. Precise Re-Os Mineral Isochron and Pb-Nd-Os Isotope Systematics of a Mafic-Ultramafic Sill in the 2.0 Ga Onega Plateau (Baltic Shield). // Earth and Planetary Science Letters. 1999. 170(4): 447-461.
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Puchtel I.S., Brugmann G.E., et al. Precise Re-Os Mineral Isochron and Pb-Nd-Os Isotope Systematics of a Mafic-Ultramafic Sill in the 2.0 Ga Onega Plateau (Baltic Shield). // Earth and Planetary Science Letters. 1999. 170(4): 447-461.
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(MSWD=108)
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Содержание Re и PGE в мантии (PUM: Becker et al., Geochimica et Cosmochimica Acta. 2006. V.70. P.4528–4550)
(CI: Horan et al. Chemical Geology. 2003. V.196. P.5-20)
PUM, ppb CI, ppb PUM/CI
Ru 7.0 652 0.0107
Rh* 1.1 130 0.0085
Pd 7.1 563 0.0126
Os 3.9 459 0.0085
Ir 3.5 456 0.0077
Pt 7.6 858 0.0089
Re 0.35 38.0 0.0092
Re/Os 0.090 0.083 1.084
Pt/Os 1.95 1.87 1.043
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Задача 19.Рассчитать современное 187Os/188Os в мантии, если Re/Os отношение в мантии на 8.4% выше хондритового, а начальные изотопные отношения осмия в этих резервуарах были одинаковые.
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Ertel et al., 2006
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CHUR
MantleOsmiridium
Osmiridium
IridosmineDeccan
KonchozeroKostomuksha
Gorgona
Gorgona
Gorgona
Gorgona
Iceland
0.090
0.100
0.110
0.120
0.130
0.140
0.150
0 1 2 3 4
T, млрд.лет
187Os188Os
Самородные платиноиды:Bird et al., EPSL, 1999.
V.170. P.83-92
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Задача 20.Рассчитать модельный возраст образца иридосмина относительно мантийного источника, если выделенный из него осмий имеет указанное в таблице 187Os/188Os. Представить результат графически.
Вариант 187Os/188Os Вариант 187Os/188Os1 0.1223 21 0.11452 0.1216 22 0.11423 0.1212 23 0.11384 0.1209 24 0.11345 0.1205 25 0.11306 0.1201 26 0.11267 0.1198 27 0.11238 0.1194 28 0.11199 0.1190 29 0.1115
10 0.1186 30 0.111111 0.1183 31 0.110812 0.1179 32 0.110413 0.1175 33 0.110014 0.1172 34 0.109615 0.1168 35 0.109216 0.1164 36 0.108917 0.1160 37 0.108518 0.1157 38 0.108119 0.1153 39 0.107720 0.1149 40 0.1073
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0.00001
0.0001
0.001
0.01
10 100 1000 10000
Ni, ppm
Re, ppm
OIB
CFB
MORB
0.0000001
0.000001
0.00001
0.0001
0.001
0.01
10 100 1000 10000
Ni, ppm
Os, ppm
OIB
CFB
MORB
Re/
Os=
1
0.00001
0.0001
0.001
0.01
0.0000001 0.000001 0.00001 0.0001 0.001 0.01 0.1
Os, ppm
Re, ppmSediments
IAB
OIB
CFB
HIMU
MORB
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0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
0.0000001 0.000001 0.00001 0.0001 0.001 0.01 0.1Os, ppm
(187 O
s/18
8 Os
) 0IAB
OIB
CFB
HIMU
MORB
Sediments
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0.10
0.12
0.14
0.16
0.18
0.20
0.22
0.24
0.001 0.01 0.1 1 10 100 1000 10000Re/Os
(187 O
s/18
8 Os
) 0IAB
OIB
CFB
HIMU
MORB
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0.11.010
0.0
0.2
0.4
0.6
0.8
1.0
1.2
0.001 0.01 0.1 1 10 100 1000 10000Re/Os
(187 O
s/18
8 Os
) 0
Sediments
IAB
OIB
CFB
HIMU
MORB
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0.11.010
0.10
0.12
0.14
0.16
0.18
0.20
0.22
0.24
0.26
0.28
0.30
0.001 0.01 0.1 1 10 100 1000 10000Re/Os
(187 O
s/18
8 Os
) 0
Sediments
IAB
OIB
CFB
HIMU
MORB
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CHUR
0.090
0.100
0.110
0.120
0.130
0.140
0 1 2 3 4
T, млрд.лет
187Os188Os