Seismic method - Geophysics for the Mineral Exploration Geoscientist - page 385

a b

9000 9000

Chromite Chromite

Olivine Olivine

Garnet Garnet

Pyrite Pyrite

8000 8000

Dolomite Dolomite

Pyroxene Magnetite Pyroxene Magnetite

7000 7000

Amphibole Amphibole

Calcite Calcite

Plagioclase feldspar Plagioclase feldspar

Haematite Haematite

Quartz Quartz

6000 6000

Alkali feldspar

Alkali feldspar

Anhydrite Anhydrite

Mica Mica

Sphalerite Sphalerite

Polyhalite Polyhalite

5000 5000

Chalcopyrite Chalcopyrite

Pyrrhotite Pyrrhotite

Halite Halite

Pentlandite Pentlandite

Barite Barite

Sylvite Sylvite

4000 4000

Carnallite Carnallite

Ice Ice

Graphite Graphite

3000 3000

Kaolinite Kaolinite

2000 2000

Igneous rocks
Other rock types
Rock-forming minerals
Economic minerals
Pore contents

Saline water Saline water

All rock types
Rock-forming minerals
Economic minerals
Pore contents

Fresh water Fresh water

1000 1000

Air Air

0 0

0.0 1.0 2.0 3.0 4.0 5.0 6.0 0.0 1.0 2.0 3.0 4.0 5.0 6.0

Density (g/cm 3 ) Density (g/cm 3 )

c) d)

9000 9000

Chromite Chromite

Olivine Olivine

Garnet Garnet

Pyrite Pyrite

8000 8000

Dolomite Dolomite

Magnetite Magnetite

Pyroxene Pyroxene

7000 7000

Amphibole Amphibole

Calcite Calcite

Plagioclase feldspar Plagioclase feldspar

Haematite Haematite

Quartz Quartz

6000 6000

Alkali feldspar Alkali feldspar

Anhydrite Anhydrite

Mica Mica

Sphalerite Sphalerite

Polyhalite Polyhalite

5000 5000

Chalcopyrite Chalcopyrite

Pyrrhotite Pyrrhotite

Halite Halite

Pentlandite Pentlandite

Barite Barite

Sylvite Sylvite

4000 4000

Carnallite Carnallite

Ice Ice

Graphite Graphite

3000 3000

Kaolinite

Sedimentary rocks
Unconsolidated sed's
Other rock types
Rock-forming minerals
Economic minerals
Pore contents

2000 2000 Kaolinite

Metamorphic rocks
Other rock types
Rock-forming minerals
Economic minerals
Pore contents

Saline water Saline water

Fresh water Fresh water

1000 1000

Air Air

0 0

0.0 1.0 2.0 3.0 4.0 5.0 6.0 0.0 1.0 2.0 3.0 4.0 5.0 6.0

Density (g/cm 3 Density (g/cm 3 )

Figure 6.28 Compilation of published seismic velocity and density measurements of rocks for pressure - temperature conditions occurring in
the upper 1 km of the Earth ' s crust. Data for selected rock-forming minerals, economic minerals and pore contents are also included. The red
line is the average crustal density of 2.67 g/cm 3 . The broken lines are contours of acoustic impedance with their separation representing
the contrast required to produce a reflection coefficient of 0.05.