A NOTE ON CHEMICAL MAGNETIZATION OF ROCKS

Autor:	Joseph D. Martinez, Edwin H. Statham, Lynn Gorman Howell, Alex Frosch
Rok vydání:	1960
Předmět:	Geochemistry Mineralogy Crystal growth Weathering Hematite engineering.material Magnetization Geophysics Iron ore Geochemistry and Petrology visual_art visual_art.visual_art_medium engineering Anisotropy Glauconite Geology Limonite
Zdroj:	GEOPHYSICS. 25:1094-1099
ISSN:	1942-2156 0016-8033
DOI:	10.1190/1.1438791
Popis:	Previously obtained magnetic data for Silurian samples from Alabama are presented. Both the remanent vector and the plane of maximum susceptibility lie close to the bedding plane for this ore containing chemically formed hematite. Now, X‐ray measurements show preferred crystal orientation of the hematite in agreement with the susceptibility anisotropy. On the other hand, samples from the Tertiary in Texas containing hematite resulting from chemical alteration show no appreciable preferred crystal orientation or susceptibility anisotropy. Thus, in this case there is no obvious relationship between the crystal growth of the hematite and the direction of the earth’s magnetic field. It is suggested that the stresses probably played a role in the crystal orientation in the Silurian iron ore. An interesting chemical magnetization took place in the Weches of Tertiary age in Texas. The unaltered glauconite in the Weches is reversely magnetized whereas the limonite derived from the glauconite by weathering is normally magnetized.
Databáze:	OpenAIRE
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