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Home NEWS Science News Chemistry

Tree rings and strontium point researchers to the provenance of 400-year-old timber

Bioengineer by Bioengineer
March 3, 2023
in Chemistry
Reading Time: 3 mins read
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Tree-ring analysis – so-called dendrochronological analysis – has been part of archaeology for many years and has made it possible for archaeologists to date old wooden objects with great precision. And in many cases, they have also been able to determine the provenance of the wood.

Sample

Credit: Photo: Aofie Daly, University of Copenhagen

Tree-ring analysis – so-called dendrochronological analysis – has been part of archaeology for many years and has made it possible for archaeologists to date old wooden objects with great precision. And in many cases, they have also been able to determine the provenance of the wood.

But it has proven difficult for researchers to determine timber’s place of origin when the historic timber was imported into Denmark from further afield to serve as building material.

In a new study in the journal PLOS ONE, Associate Professor Aoife Daly and Dr Alicia Van Ham-Meert from the University of Copenhagen show that combining analyses of strontium and tree rings in timber can provide a more detailed picture of the origin of timber.

“Dendrochronology is a powerful tool for identifying the region of origin of historic timber. One of the potential biases in the method is the use of a dataset that in itself has a history of transport and re-use. This phenomenon is clear, for example, when timber particularly from urban centres are from varying sources. This is where strontium enters the picture,” says Aoife Daly and adds: 

“Specifically, we have taken timber samples from three old houses in the Danish towns of Aalborg and Horsens. A good example is a sample from a house in Horsens, where the dendrochronological analysis mistakenly showed that the wood was Danish; the strontium signature, however, precisely matched a location in southern Sweden, which indicates that the timber had been transported from southern Sweden to Horsens and used to build the house there. This is not surprising in as much as Sweden was part of the Kingdom of Denmark at the time, but it is important for us to be able to distinguish between places of origin of the objects we find.”

Busy timber trade along the south coast of Sweden
Gothenburg used to be regarded as the central shipping port for the timber trade during this period. However, the new results suggest that other ports also played a role in the very lively timber trade in the region: 

“The fact that some of the samples have been found to originate from southern Sweden is important because it tells us that the timber trade was spread out over a much larger area than we have previously believed. And the strontium signatures point to an area around the Göta River, which must have been an important transport route for the timber traders,” concludes Aoife Daly.

Dendrochronology 
Dendrochronology, also called tree-ring analysis, is the scientific discipline concerned with dating and interpreting past events based on the analysis of tree rings. The rings are counted and measured, and the sequence of rings is correlated with sequences from other trees.    

 

Strontium 
Strontium is a chemical element found in the Earth’s crust, but its prevalence varies depending on the geology of each region. Humans, animals and plants absorb strontium through water and food. In this way, strontium works a bit like a satnav: by analysing the strontium isotopes in archaeological artefacts, you can determine where in the world they originate from, because their strontium isotope signature will reflect the region the artefacts come from.   

 

The article “Provenancing 16th and 17th century CE building timbers in Denmark – combining dendroprovenance and Sr isotopic analysis” has just been published in the journal PLOS ONE.

The study is part of the TIMBER research project, which is funded by the European Research Council (ERC).



Journal

PLoS ONE

DOI

10.1371/journal.pone.0278513

Method of Research

Content analysis

Article Title

Provenancing 16th and 17th century CE building timbers in Denmark–combining dendroprovenance and Sr isotopic analysis

Article Publication Date

9-Feb-2023

COI Statement

The authors have declared that no competing interests exist.

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