NDLI: Changes in Magnetic Properties of Baked Archaeological Samples. Implications for Palaeointensity Determination

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Reviews Monitoring the Comprehensive Nuclear-Test-Ban Treaty: Source Location, edited by Frode Ringdal and Brian L. N. Kennett. Birkhäuser Verlag Basel-Boston-Berlin, 2001, Reprint from Pure and Applied Geophysics (PAGEOPH), Volume 158 (2001), No.1/2, 428 pages

Studia Geophysica et Geodaetica : Volume 45, Issue 1, January 2001

Studia Geophysica et Geodaetica : Volume 44

Studia Geophysica et Geodaetica : Volume 43

Studia Geophysica et Geodaetica : Volume 42

Studia Geophysica et Geodaetica : Volume 41

Changes in Magnetic Properties of Baked Archaeological Samples. Implications for Palaeointensity Determination

Content Provider	Springer Nature Link
Author	Jordava, N. Jordava, D. Petrovský, E. Kovacheva, M.
Copyright Year	2001
Abstract	Rock magnetic investigations of archaeological materials of burnt clay from Eneolithic ovens (∼4500 years BC) showed particular changes with time in the magnetic mineralogy of samples, stored under normal conditions. Our results indicate that well-burnt clay from the archaeological materials contains a significant amount of very fine magnetic grains, which could notably influence the rock magnetic properties and behavior at room temperature. The main observations after 4 years of storage under laboratory conditions are as follows: 1) decrease in the final unblocking temperature of NRM from ∼600–620°C to ∼580°C and 2) increase in the capacity of laboratory TRM acquisition. The most probable mechanism responsible for the observed changes is supposed to be fast low-temperature oxidation of the finest (superparamagnetic) grains and the development of the maghemite shell in coarser single-domain grains. The Thellier palaeointensity experiments, carried out at the beginning of the study, showed very good results, which satisfy all acceptance criteria, applied to evaluation of the results, quite well. Palaeointensity determinations repeated 4 years later on samples from the same material showed the experimental results to be of significantly inferior quality. The main difference is the presence of the significant deviation (change in the slope) on the Arai diagram after T>350–400°C. The calculated palaeointensity is either higher than the one obtained before, or similar, but evaluated with large uncertainty. Therefore, we conclude that the possibility to obtain biased palaeointensity values increases during short-time storage (i.e. several years) due to the low-temperature changes of the material.
Starting Page	297
Ending Page	318
Page Count	22
File Format	PDF
ISSN	00393169
Journal	Studia Geophysica et Geodaetica
Volume Number	45
Issue Number	3
e-ISSN	15731626
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2001-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Structural Geology Geophysics/Geodesy Meteorology/Climatology
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Geophysics

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