Typical magnetic properties of rocks
- Typical magnetic properties of rocks
-
Typical magnetic properties of rocks
rock Jn
natural remanent magnetization (10−5 electromagnetic units per cubic centimetre) k
magnetic susceptibility (10−5 electromagnetic units per cubic centimetre) ratio*
Qn=Jn/k·Hex
Igneous
granite 10–80 50–400 0.3–1
diabase 190–400 100–230 2–3.5
basalt 200–1,000 100–700 5–10
seafloor basalt (1–6 metres) 500–800 30–60 25–45
typical (
average)
10–
4,
000 5–
500 1–
40
Sedimentary
red sediments 0.2–2 0.04–6 2–4
sandstone 1–40
shale 1–50
limestone 0.5–20
typical (
average)
0.
1–
10 0.
3–
30 0.
02–
10
Ores
magnetite ore 300,000–1,000,000 30,000–100,000 Typical magnetic properties of rocks10–50
hematite ore 10–70
*For external magnetic field (Hex) = 0.5 oersted, the cgs electromagnetic unit of magnetic field intensity.
Source: After Robert S. Carmichael, ed., Handbook of Physical Properties of Rocks, vol. II, CRC Press, Inc. (1982).
See as table:
* * *
Universalium.
2010.
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