Archeomagnetism in the use of brick dating lanos

Rock magnetic properties reveal high variance in the kilns that point to varying spatial heating and cooling conditions in the kilns.

archeomagnetism in the use of brick dating lanos-26

Archeomagnetism in the use of brick dating lanos

The integration of dating methods in building archaeology has resulted in an advance in the qualitative and quantitative information available for the study of the history of architecture and building techniques.

To examine the question of the origin of post-Roman ceramic building materials, archaeological studies of early medieval buildings in France and England have been combined with scientific dating methods and applied to their component tiles and bricks.

The latter were sampled and analysed using luminescence dating techniques.

The results show that, as well as the practice of reusing bricks or tiles salvaged from abandoned Roman sites, brickmaking was not a forgotten skill in north-western France and appears to have been continuously practised in the region.

Although the method is geographically restricted since it depends on the existence of a reference curve per region, there is also the possibility in Europe to resort to a geomagnetic model which allows predicting the secular variation in one site (for the last 3 millenia), even if reference data is little in the area.

For the geographical regions where the method has been developed and for which reference curves have been well established, AM can be applied from 1500 BC (in France)- 6000 BC (in Bulgaria) until now (Lanos et al., 1999).

The three kilns yielded very well defined ancient field directions but two possible dating solutions for each of them when no a priori time constraints are taken into account, due to field direction recurrence.

As an increase of the dating accuracy and reduction of the number of dating solutions can be expected using the full field vector information, also field intensity determinations on burnt clays from the kilns were attempted.

If several intervals of dates can be obtained, another independent dating method or the historical or archaeological context can help provide an indication of which interval is the most probable (Blain et al, 2014) The method consists in measuring the intensity, the inclination and the declination of the TRM from a homogeneous group of bricks or tiles and comparing them with the reference secular variation curves of the known EMF direction and intensity for the given geographical area (Lanos, 1990; 1994; Lanos et al., 1999).

Those reference curves, characteristic of a specific area (of a 1000 km radius), have been built from data of the TRM measured on well-dated archaeological local fired structures (such as Roman, medieval kilns, et.

Many areas in the European Union (EU) are undergoing rapid economic expansion, inevitably involving the loss of our shared cultural heritage.

Tags: , ,