Table 2.

Data on representative flow lobes from study areas of Argana Basin (see Fig. 4 for the location of flow lobes in lithostratigraphic columns)

AreaLobesTotal thickness (m)Basal crust (m)Core (m)Upper crust (m)Remarks
Tizi el Hajaja302010Thick, extensive (exposed length >100 m) sheet lobe. Dense lava core with vesicles cylinders. Presence of several injections of baked siltstone, randomly dispersed within the lava core and the upper lava crust (‘peperites’?). Multiple small P-type and S-type lobes at the top of the lava flow.
c20.20.2155Well-preserved thin basal lava crust. Dense lava core and vesicular upper crust.
d1284Dense core. Vesicular upper crust. Multiple small S-type lobes at the top of the lava flow.
Alemzi Southa302010Thick and extensive sheet lobe (exposed length >150 m). Multiple S-type lobes at the top of the lava flow.
c110.3773.63Thin basal lava crust well preserved. Dense core with horizontal jointing. Vesicular crust. Multiple small P-type and S-type lobes at the top of the lava flow.
Tasguinta20.514.56Sheet lobe with horizontal jointing at the upper part of the lava core.
b12102Dense core. Vesicular upper crust.
c6.54.52Horizontal jointing in the upper part of the lava core.
e6.20.233Well-preserved thin basal lava crust. The boundary between the lava core and the lava crust is not clear.
f9.250.2563Three-tired structure with thin basal lava crust, dense core and vesicular upper crust.
g963Dense core. Vesicular upper crust.
h13.750.258.55Three-tired structure: thin basal lava crust, dense core and vesicular upper crust. Presence of pipe vesicles.
i1587Well-preserved thin basal lava crust. Horizontal jointing in lava core.
m844Dense core and vesicular upper crust.
Alemzi Northa9.563.5Base not well exposed. Important vesiculation at the upper part of lava core.
b27.11611.1Multiple small P-type and S-type lobes at the top of the lava flow. Existence of squeeze-ups, and horizontal squeezes.
d1284Multiple small P-type and S-type lobes at the top of the lava flow.
Aguersouanea16106Dense core, and vesicular upper crust.
b18108Vesicular core and upper crust.
c26188Dense core with horizontal jointing.
Igounana251312Thick, extensive sheet lobe. Presence of vesicles cylinders and horizontal vesicles sheets in the lava core. Multiple P-type lobes at the top of the lava flow.
d20119Dense core and vesicular upper crust.
g14104Dense core and vesicular upper crust.