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Geothermal Energy

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Table 1 Densities of rock units

From: 3D geophysical inversion modeling of gravity data to test the 3D geologic model of the Bradys geothermal area, Nevada, USA

Rock unit

Rock type

Starting density (g/cm3)

Homogeneous unit density inversion output (g/cm3)

Heterogeneous unit density inversion output (g/cm3)

Abundance of the rock unita (%)

Q

Quaternary sediments

1.9

2.33

1.9 (fixed)

0.5

Tsy

Miocene sediments

2.1

2.09

2.03–2.15

3.2

Tsl

Miocene lacustrine sediments

1.7

2.2

2.14–2.20

3.0

Tls

Miocene limestone

2.35

2.46

2.40–2.52

0.6

Tbo

Miocene basalt

2.7

2.55

2.49–2.61

20.3

Tpd

Miocene dacite and rhyodacite flows and domes

2.4

2.04

1.98–2.10

0.3

Tlr

Miocene rhyolite lavas and tuffs

2.15

2.3

2.24–2.36

0.3

Tda

Miocene andesite and dacite lavas

2.5

2.1

2.04–2.16

15.8

Trt

Oligocene ash flow tuffs

2.3

2.74

2.68–2.80

11.1

Mzu

Mesozoic undivided basement (meta-sedimentary and granitic rocks)

2.8

2.6

2.54–2.66

44.9

  1. Density values for rock types at Bradys geothermal area: assumed starting densities, density results from the homogeneous rock unit geophysical inversion modeling, and density results from the heterogeneous rock unit geophysical inversion modeling (assumed starting densities were guided by values from analogous rock units in northwestern Nevada; Drakos 2007)
  2. aAs a percentage of the total model volume
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