This page documents some of the features recorded related to vesicle accumulation and flow as vesicle aggregates,
exposed in pavement stones in the city of Melbourne. Key features are:
1. Pipes: simple and composite
2. Layers: irregular surfaces and gradient in vesicle sizes
3. Vesicles in fractures and in breccias
4. Drainage pipes
5. Complex features, including vesicular dykes
1. Pipes: simple and composite, longitudinal and orthogonal sections
Figure 3b) Angular blocks of vesicle-poor basalt separated by vesicle-rich bands .
Figure 3c) Breccia formed by vesicle-poor basalt and vesicle-rich matrix (black stains are wet areas).
Figure 3d) Breccia formed by vesicle-poor basalt and vesicle-rich matrix (black stains are wet areas).
Figure 3e) Breccia formed by vesicle-poor basalt and vesicle-rich matrix(black stains are wet areas).
Figure 3f) Fractures forming a conjugate set (?) (marked as two black lines).
4. Drainage pipes
Figure 4a) Vesicle-rich pipe linked with a wider region, possibly a layer.
Figure 4b) On the right-hand-side there is a layer of bubbly-basalt (vertical on photograph). This
is linked with an irregular network of interconnected narrow bands of bubbly basalt that trends horizontally on photo.
The bands widen from left to right, and the bands merge leftwards.
Figure 4c) On the right-hand-side there is a layer of bubbly-basalt (vertical on photograph). This
is linked with an irregular network of interconnected narrow bands of bubbly basalt that trends horizontally on photo.
The bands widen from left to right, and the bands merge leftwards.).
Figure 4d) Same pattern.
Figure 4e) Detail of features above.
5. Complex features including vesicular dykes
Figure 5a) Merging of planar (2D)? vesicle-rich zones.
Figure 5b) Irregular vesicle-rich band, in both width and orientation.
Figure 5c) .
Figure 5d) .
Figure 5e) Splitting of a single central, wide band into two narrower bands. This is similar to the splitting of a dyke and
suggests that these are planar features rather than pipes.
Figure 5f) Divergence or the splitting of a wide vesicle-rich band into two, akin to the splitting of
a dyke tip.
Figure 5g) Complex features including a narrow fracture marked by two arrow heads in the high resolution
version (double click on photograph). .