Geology Reference
In-Depth Information
(a)
0
100
200
300
400
500
600
700
800
100
C18n.2n
C18n.1n
C17n.3n
C17n.2n
C17n.1n
356.5 kyr
231.7 kyr
ARM stratigraphy
2
π
MTM power spectrum
80
10
133.5 kyr
C18r
C18n.1r
C17r
C17n.2r
C17n.1r
C16r
60
8
ARMstratigraphy
63.5 kyr
40
6
20
4
less 13%weighted average
0
2
2
0
0.05
0.1
0.15
0.2
0.2
5
1.5
Cycles/kyr
GPTS2004 time
(b)
squeezed
Filter minima define
405-kyr cycles
1
30
0.5
GPTS2004 time
2
π
MTM
0
25
400 kyr
Low-pass taner filter
to aid in selecting
405-kyr cycles;
f
cut
= 0.004 cycles/kyr
-0.5
20
-1
di l ated
125 kyr
15
Filter minima notused
-1.5
405-kyrtime
-2
2
10
80 kyr
1.5
5
1
0
0.5
0
0.01
0.02
0.03
0.04
0.05
0.06
0
(c)
Cycles/kyr
-0.5
-1
50
400 kyr
405-kyr time
2
π
MTM
-1.5
40
-2
0.06
30
250 kyr
0.04
20
129 kyr
0.02
10
0
2
0
0
0.01
0.02
0.03
0.04
0.05
0.06
La2004eccentricitytime
1.5
(d)
Iteration 1
Cycles/kyr
1
0.5
30
400 kyr
La2004 eccentricity time Iteration 1
2
π
MTM
0
25
-0.5
2
20
Low-pass gauss filter
for eccentricity variation;
f
cut
= 0.015 cycles/kyr
-1
1.5
Filter minima tied to
eccentricity minima
15
-1.5
1
178 kyr
94 kyr
-2
0.5
10
0
5
-0.5
0.06
0
-1
0
0.01
0.02
0.03
0.04
0.05
0.06
-1.5
(e)
Cycles/kyr
0.04
-2
30
400 kyr
0.02
La2004 eccentricity time Iteration 2
2
π
MTM
25
94 kyr
Band-pass gauss filter
for precession index;
f
cut
= 0.05±0.02 cycles/kyr
0
20
2
1.5
La2004 eccentricitytime
15
Iteration2
1
10
0.5
5
0
-0.5
0
-1
0
0.01
0.02
0.03
0.04
0.05
0.06
(f)
0.5
Filter maxima tied to
precession index minima
-1.5
Cycles/kyr
-2
25
0
La2004 precession index time
2
π
MTM
20
400 kyr
-0.5
15
-0.08
-0.04
0
0.04
0.08
95 kyr
128 kyr
10
5
24 kyr
22 kyr
19 kyr
2
0
1.5
La2004 precessionindex time
0
0.01
0.02
0.03
0.04
0.05
0.06
1
Cycles/kyr
(g)
0.5
0
36000
36500
37000
37500
38000
38500
39000
39500
40000
-
0.5
-
1
1.2
-
1.5
1
-
2
0.8
Accumulation rate
0.6
GTS2004
405 kyr
Eccentricity 1
Eccentricity 2
Precession index
0.4
0.2
0
39500
39000
38500
38000
37500
37000
36500
36000
0 00
200 00
400 00
600 00
800
40000
Stratigraphic position (m)
Kiloyears before present
