آناليز ايزوتوپ هاي پايدار استرانسيوم و عناصر كمياب Sr و Ba اسكلت‌هاي گورستان عصر آهن مسجد كبود تبريز

Strontium Stable Isotopes and Trace Elements Analysis of Skeletons in the Iron Age Cemetery of Blue Mosque in Tabriz

در اين پژوهش نمونه هاي دندان و استخوان ده اسكلت از اسكلت هاي محوطه باستاني مسجد كبود تبريز به منظور تعيين بومي يا غيربومي بودن آنها با دو روش آناليز ايزوتوپ هاي پايدار استرانسيوم 87Sr/86Sr و آناليز عناصر كمياب Sr/Ca و Ba/Ca بررسي و مطالعه شدند. نتايج آناليز ايزوتوپ هاي پايدار نشان مي دهد كه غير از اسكلت شماره 8/81 مابقي نمونه ها بومي هستند. مقايسه لگاريتم Sr/Ca نمونه هاي استخوان با اين نسبت در نمونه هاي دندان نشان داد كه مقدار پي (P-Value) 509/0 و بزرگ‌تر از سطح معناداري 05/0 است (05/0 P > )؛ در نتيجه مي توان گفت كه اختلاف معناداري بين نسبت Sr/Ca نمونه هاي دندان و استخوان وجود ندارد. مقايسه لگاريتم Ba/Ca نمونه هاي استخوان و دندان از طريق آزمون تي نيز عدد پي 821/0 را نشان داد كه اين مقدار نيز بزرگ‌تر از سطح معناداري است (05/0 P > )؛ در نتيجه، در اين مورد نيز، تفاوت معناداري بين نسبت Ba/Ca نمونه هاي دندان و استخوان وجود ندارد؛ بنابراين، نتايج آناليز عناصر كمياب حاكي از بومي بودن نمونه هاست.

Stable isotope analysis, being used in many research areas, has also been applied in archaeology during the last three decades to address questions regarding the paleoclimatology and ancient diet, mobility and migration. Despite the growing number of the application of stable isotope analysis in archaeological studies, there is a very few research in this regard in archaeology of Iran. This research aims to study the human skeleton remains of Iron Age site of Masjed Kabud in Tabriz, using strontium stable isotope analysis. Therefore, tooth and bone samples obtained from skeletons of the mentioned site where studied through strontium isotope ratio (87Sr/86Sr) and trace element analysis Sr/Ca and Ba/Ca to address the question if the skeletons are local or non-local. Result of 87Sr/86Sr revealed that all samples could be considered as local except of 81-8 burial, which belongs to a female individual, as it was out of the local range (local mean ± 2 SD). The result of trace element analysis and measuring the Sr/Ca and Ba/Ca were analyzed statistically suing independent test sample. Results for both sample groups (Sr/Ca and Ba/Ca between teeth and bones) demonstrate that there is no significant difference between the two sample groups. Therefore skeletons could be considered as local. This research in addition to addressing the hypothesis, mentioned above, revealed that the method could be applied in similar research projects and the result of strontium isotope and trace element analysis could be also sued in different studies such as archaeology, geology and other interdisciplinary scientific areas.