Geology Reference
In-Depth Information
Mauch chunk Fm.
portable susceptibility meter
0.35
0.3
0.25
0.2
0.15
0.1
Figure 6.12
Magnetic
susceptibility (χ) for 63 m of
the Mauch Chunk Formation
collected in 0.5 m intervals at
Pottsville, Pennsylvania. Note
the meter scale variability
superimposed on ~10 m cycles.
0.05
0
0 0 0 0
Stratigraphic position (m)
40
50
60
70
Mauch chunk Fm-pottsville
portable susceptibility meter
0.02
13.3 m
Red noise
90%
95%
10.3 m
Figure 6.13
MTM spectral
analysis of susceptibility rock
magnetic cyclostratigraphy
collected with a hand-held
susceptibility meter for the
Mauch Chunk Formation
at Pottsville, Pennsylvania.
If the 11 cm/kyr sediment
accumulation rate determined
by magnetostratigraphy is
applied to the spectral peaks,
13.3 and 10.3 m are short
eccentricities and the 2.6, 2.1,
and 1.7 m peaks are in the
precessional band.
0.015
99%
Power
0.01
0.005
2.6 m
1. 7m
2.1 m
0
0
0.2
0.4 0.6
Frequency
0.8
1
et al.'s (2000) calibration to the Carboniferous and the most recent Gradstein
et al. (2012) geologic timescale, this normal polarity interval is 890 kyr in
duration that would suggest an 11 cm/kyr sediment accumulation rate for
the Mauch Chunk Formation at Pottsville. The magnetostratigraphically
constrained sediment accumulation rate would indicate that the 13.3 m
spectral peak is 121 kyr in duration, the 10.3 m peak is 94 kyr in duration,
