A comparison of different magnetic methods for determining the relative grain size of magnetite in natural materials: some results from lake sediments

Author:

King, John, Banerjee, Subir K., Marvin, James, Ozdemir, Ozden

Title:

A comparison of different magnetic methods for determining the relative grain size of magnetite in natural materials: some results from lake sediments

Periodical:

Earth and Planetary Science Letters

Year:

1982

Volume:

59

Pages:

404-419

Subject:

Lake Waiau Lake sediments

Summary:

A new rapid method for identifying relative grain size variations in magnetite samples is proposed to explain the use of the chi (sub ARM) versus chi plot for detecting relative grain-size changes in the magnetite content of natural materials. The sediments of three lakes, including Lake Waiau in Hawaii, are used to test the model. The model is used to interpret the magnetic variations observed, and the interpretations are supported by high-field hysteresis measurements of the same sediments. The combination of the high-field hysteresis method and the chi (sub ARM) versus chi method is a powerful technique allowing the rapid identification of both the relative grain size and domain state for large numbers of samples containing magnetite. The chi (sub ARM) versus chi method should be used as an initial means of identifying distinct groups of samples.

Label:

Lake Waiau

Collection:

Periodicals