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Decrease Surface Gabbro R«jp/V^/^ Granite'-^ B Increase Magnetic field strength
Decrease Surface Figure 2.25 Positive magnetic anomalies can indicate hidden
ore and geologic structures. A positive magnetic anomaly is a reading of ...
Positive magnetic anomaly Magnetometer record of magnetic field strength
Oceanic crust Positive magnetic anomaly Negative magnetic anomaly Negative
magnetic anomaly Rift valley at ridge crest Rift valley at ridge crest 10 Kilometers
The dike pattern becomes symmetric about the ridge crest. magnetic anomaly.
Dikes that are reversely magnetized subtract from the present magnetic field of
the earth, and so a magnetometer towed over such dikes measures a weaker ...
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Introduction to Physical Geology
Terms to Remember 382
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