Geology Reference
In-Depth Information
~
6 times
the longest
cycle
3 or 4 times per
shortest cycle
1. Field sampling
2. Tr im and weigh samples
(a)
ARM
C18n.2n
C18n.1n
C17n.3n C17n.2n
C17n.1n
0.4
0.2
0.0
10
C18r
C18n.1r
C17r
C17n.2r C17n.1r
C16r
8
6
4
-0.2
-0.4
2
0
100
200
300
400
500
600
700
800
0
200
400 600
Time (ms)
800
1000
Meters upsection
(b)
150
356.5 kyr
231. 7 kyr
133.5 kyr
GTS2004 paleomag reversal scale:
1000 m/4.35 myr=230 m/myr
53 m
30.7 m
100
24.3 kyr
22.8 kyr
20.6 kyr
5.58 m
5.25 m
50
(
63.5 kyr
)
(14.6 m)
4.73 m
0
0
0.05
0.1 0.15
Cycles/meter
0.2
0.25
3. Apply laboratory remanence
and measure remanence
4. Time series analysis
Figure 1.1
Steps to a rock magnetic cyclostratigraphy. Step 1: The field sampling picture is the Eocene Arguis
Formation in the Spanish Pyrenees. Step 2: Cretaceous Cupido Formation limestone samples in 8 cm
3
plastic
sampling boxes. Step 3: Diagram of alternating and direct fields during application of an ARM. Lehigh University 2G
Enterprises superconducting rock magnetometer. Step 4: (a) Arguis Formation ARM series and magnetostratigraphy
developed for the Arguis Formation. (b)
Multitaper method (MTM)
power spectrum of the Arguis Formation ARM
time series. Source: Kodama, Anastasio, Newton, Pares & L. A. Hinnov 2010. Reproduced with permission of
John Wiley & Sons, Inc.
