✦ LIBER ✦

Lightning strikes and prehistoric ovens: Determining the source of magnetic anomalies using techniques of environmental magnetism

✍ Scribed by David Maki

Book ID: 102222990
Publisher: John Wiley and Sons
Year: 2005
Tongue: English
Weight: 162 KB
Volume: 20
Category: Article
ISSN: 0883-6353
DOI: 10.1002/gea.20059

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✦ Synopsis

Abstract

Techniques of environmental magnetism were used to examine soil samples from a North American archaeological site in an effort to determine the source of magnetic field gradient anomalies. Testing revealed the source of one anomaly to be lightning‐induced remanent magnetization (LIRM). This anomaly had initially been identified as a possible archaeological feature, but excavations were unable to identify a visible source. LIRM appears to be a relatively common source of anomalous signal on archaeological sites and may often be misinterpreted in magnetic imagery. Thermoremanent magnetization (TRM) was also documented and quantified in soil from archaeological hearths at the site, as were changes in the ferrimagnetic mineral concentration and coercivity spectra resulting from high‐temperature enhancement within the hearths. © 2005 Wiley Periodicals, Inc.

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