DATING THACH LAC: CRYPTIC CaCO<sub>3</sub> DIAGENESIS IN ARCHAEOLOGICAL FOOD SHELLS AND IMPLICATIONS FOR <sup>14</sup>C

نویسندگان

چکیده

ABSTRACT In many locations around the world, shell radiocarbon dates underpin archaeological research. The dating of brings chronological relationship between sample and target event (e.g., hunting food preparation) into congruence, while shells are valuable geochemical proxies for understanding past climate dynamics environments. However, this information can be lost as shell, composites biopolymers carbonate minerals (mostly calcite or aragonite), undergo diagenetic alteration. While studies Pleistocene-age carbonates common in literature, there has been little research impact alteration on Holocene-age used to interpret recent societal developments. limits our these changes became evident when Placuna placenta (naturally calcitic) Tegillarca granosa aragonitic) from site Thach Lac Vietnam. These returned ages significantly younger than associated charcoal terrestrial bone at site, but standard tests secondary recrystallization (XRD staining techniques) did not indicate any Further investigation revealed that cryptic (i.e., same crystal structure) had occurred both aragonite shells. This finding suggests may have an undetected some dates.

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ژورنال

عنوان ژورنال: Radiocarbon

سال: 2022

ISSN: ['0033-8222', '1945-5755']

DOI: https://doi.org/10.1017/rdc.2022.63