In situ cosmogenic seminar

1
In situ cosmogenic seminar
3. ?????
Outline 1. ???(?????????) 2. ????????(?????)
?? ?? matsushi_at_n.t.u-tokyo.ac.jp
2
1. ??????????
2. ????????(?????)
Goal ????????????????????.
Outline 1. ?????????? 2. ??????? 3. ?????
3
1. ??????????
??????????????????.
Stable
Saturation
Radio active
log-log scale
?????????????, ????????.
4
1. ??????????
Irradiation
??????????????????.
Surface
C(t)
Rock or soil
Saturation
Radio active
log-log scale
?????????????, ????????.
5
1. ??????????
Irradiation
??????????????????.
Surface
C(t)
Rock or soil
Saturation
Radio active
log-log scale
?????????????, ????????.
6
1. ??????????
Irradiation
??????????????????.
Surface
C(t)
Rock or soil
Saturation
Radio active
log-log scale
?????????????, ????????.
7
1. ??????????
Irradiation
??????????????????.
Surface
C(t)
Rock or soil
P(x)/l
Saturation
Radio active
log-log scale
?????????????, ????????.
8
1. ??????????
Irradiation
??????????????????.
Surface
C(t)
Rock or soil
P(x)/l
Saturation
Radio active
log-log scale
?????????????, ????????.
9
2. ???????
2. ????????(?????)
Goal ????????????????????.
Outline 1. ?????????? 2. ??????? 3. ?????
10
2. ???????
?????????????,?????????????.
?????????
???????
11
2. ???????
?????????????,?????????????.
?????????
12
2. ???????
?????????????,?????????????.
?????????
????Dt ???,Dx ????????,
?????????????????F ?
x, C(t,x)
13
2. ???????
?????????????,?????????????.
?????????
????Dt ???,Dx ????????,
?????????????????F ?
x, C(t,x)
14
2. ???????
?????????????,?????????????.
?????????
????Dt ???,Dx ????????,
?????????????????F ?
x, C(t,x)
15
2. ???????
?????????????,?????????????.
?????????
????Dt ???,Dx ????????,
?????????????????F ?
x, C(t,x)
???????(??)???, ????(???)???
16
????,?????????????,?????????,
x f(t) ?????
17
????,?????????????,?????????,
x f(t) ?????
18
????,?????????????,?????????,
x f(t) ?????
??????.
19
??????????????????????
x 0, t ? 8???,
20
??????????????????????
x 0, t ? 8???,
No erosion
Saturation P0/l
e 1
Steady-state erosion equilibrium
e 10
e 100
e ???????,
log-log scale
21
??????????????????????
x 0, t ? 8???,
No erosion
Saturation P0/l
e 1
Age or rate, not both
Steady-state erosion equilibrium
e 10
e 100
e ???????,
log-log scale
22
??????
26Al
10Be
40 mm/kyr 500 kyr
25 mm/kyr 150 kyr
e 6 mm/kyr t 60 kyr
C0 0 atoms/g, x 0 cm
23
3. ?????
??A,B??CA, CB ????.
2. ????????(?????)
Goal ????????????????????.
Outline 1. ?????????? 2. ??????? 3. ?????
24
3. ?????
??A,B??CA, CB ????.
?????,
26Al/10Be
(6.0)
25
3. ?????
??A,B??CA, CB ????.
?????,
26Al/10Be
(6.0)
???????,
(2.8)
26
3. ?????
??A,B??CA, CB ????.
?????,
26Al/10Be
(6.0)
???????,
(2.8)
Steady-state erosion equilibrium ???,
27
3. ?????
??A,B??CA, CB ????.
?????,
26Al/10Be
Steady-state erosion island
(6.0)
102 mm/kyr
101 mm/kyr
???????,
100 mm/kyr
(2.8)
10-1 mm/kyr
Steady-state erosion equilibrium ???,
PBe 5.1 atoms/g/yr PAl 31.2 atoms/g/yr r
2.0 g/cm3
28
???
?????????????????????????, ????????????????????
.
?????????????,????????,????
????????,?????????????.
??????????(?)????,?????,?????
????????????????.