SUCCESSFUL AMS 14C DATING OF NON-HYDRAULIC LIME MORTARS FROM THE MEDIEVAL CHURCHES OF THE ALAND ISLANDS, FINLAND

被引:74
|
作者
Heinemeier, Jan [1 ]
Ringbom, Asa [2 ]
Lindroos, Alf [2 ]
Sveinbjornsdottir, Arny E. [3 ]
机构
[1] Aarhus Univ, Dept Phys & Astron, AMS Dating Ctr 14C, DK-8000 Aarhus C, Denmark
[2] Abo Akad Univ, Turku, Finland
[3] Univ Iceland, Inst Earth Sci, Reykjavik, Iceland
基金
芬兰科学院;
关键词
RADIOCARBON CALIBRATION; ISOTOPIC FRACTIONATION; CARBON; DELTA-C-13; PROGRAM;
D O I
10.1017/S0033822200045124
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Fifteen years of research on accelerator mass spectrometry (AMS) radiocarbon dating of non-hydraulic mortar has now led to the establishment of a chronology for the medieval stone churches of the Aland Islands (Finland), where no contemporary written records could shed light on the first building phases. In contrast to other material for dating, well-preserved mortar is abundantly available from every building stage. We have gathered experience from A MS dating of 150 Aland mortar samples. Approximately half of them have age control from dendrochronology or front C-14 analysis of wooden fragments in direct contact with the mortar. Of the samples with age control, 95% of the results agree with the age of the wood. The age control from dendrochronology, petrologic microscopy, chemical testing of the mortars, and mathematical modeling of their behavior during dissolution in acid have helped us to define criteria of reliability to interpret the C-14 results when mortar dating is the only possibility to constrain the buildings in time. With these criteria, 80% of all samples reached conclusive results, and we have thus far been able to establish the chronology of 12 out of the 14 churches and chapels, while 2 still require complementary analyses.
引用
收藏
页码:171 / 204
页数:34
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