Forms the basis of archaeomagnetic dating gratis chat sider Guldborgsund

Posted by / 22-Sep-2017 13:01

For the first time archaeomagnetic dating of the red pictorial layer was carried out at a Maya archaeological site, providing a direct date to the pigmented lime plasters.

The method is based on the findings of Chiari and Lanza [31] who reported that the direction of the magnetic field persisted in the hematite of the red pigments of the pictorial layer in the Sistine Chapel.

Several works specify organic substances as components that modify the properties of the lime mortars in Maya archaeological sites [12,16,27].

The instrumental dating of Maya lime plaster presents a major problem.

We decided to attempt the AMS dating of a mortar sample in order to further explain its result on the basis of petrographic observations.

Taking into account the high risks of obtaining an inadequate radiocarbon age, we decided to apply an alternative dating technique to the stuccoes of Dzibanché.

There are some key publications [10,11,12,13,14,15,16] establishing the ways in which the Maya created their plasters, mortars, and stuccoes in a broad way.

We have chosen the petrographic analysis of thin sections from undisturbed mortar samples (complemented with other analyses) because only with this technique could we identify the mineral composition, micromorphology, distribution, and quantity of aggregates and matrix of the samples.

This technique also allowed us to distinguish secondary features formed due to weathering.

We use mainly thin sections for the study and other types of analysis to reinforce the results.

Thus, combining the data on composition and structure of the plasters with their instrumental dating and archaeological characteristics, we intended to answer the following questions: Special attention was paid to the controversial issue of interpretation of the organic compounds in the plasters: our purpose was to identify them and to understand whether they were introduced intentionally as part of technological manipulations or appeared accidentally due to natural processes.

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Contamination of this kind results in C14 dates much older than supposed by the historical context, and obviously the mortar itself.