Environmental Engineering Reference
In-Depth Information
KTB
(a)
Age (Ma)
61
62
63
64
65
66
67
68
69
C27r
C28n
C29n
C29r
C30n
C31n
(b)
Deccan 3rd
phase
Deccan 2nd
phase
Deccan 1st
phase
Age (Ma)
61
62
63
64
65
66
67
68
69
C27r
C28n
C29n
C29r
C30n
C31n
(c)
?
10 3 yr to 10 5 yr
1 pulse
(d)
N flows
Years to decades
<100 yr
Figure 15.4 Embedded timescales of volcanic activity in traps (Deccan case).
(a) Reversal timescale near the KTB (indicated by the vertical line) and schematic
spread of the total database of age determinations indicating activity over several
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