Geology Reference
In-Depth Information
10
-10
10
-12
10
-14
Micropores
10
-16
Diktytaxitic
Flow 2
Flow 1
Scoria
10
-18
0
10
20
30
40
50
60
70
80
Total porosity (
φ
)%
Figure 10.9
Total porosity versus permeability relationship in volcanic rocks
(basaltic andesites and scoria) from the Cascades, USA. Porosity ranges from
close to 0% to nearly 80% in highly vesicular scoria.
N
Teide - Pico Viejo
Main growth stages of the
Las Cañadas edifice
S
Breccia deposits
N
S
Old Basaltic Edifices
Figure 10.10
Schematic cross section through the island of Tenerife showing
basement rock (old volcanic edifice) and breccia deposits to the north (interpreted
as the products of successive northward directed lateral collapse), with the active
Teide-Pico Viejo complex constructed on top. The structure and stability of the
volcano are governed by the geotechnical properties of both the edifice and the
basement rocks upon which it is built.
