Typical magnetic properties of rocks

Typical magnetic properties of rocks

Table
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).
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