Marine Reservoir Correction for the Southern Marshall Islands for the Past 2500 Years
| Autor: | Jian-xin Zhao, Morana Mihaljević, Luke D. Nothdurft, Ai Duc Nguyen, Hiroya Yamano, Marshall I. Weisler, Quan Hua |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010506 paleontology
Archeology geography geography.geographical_feature_category Branch coral 010504 meteorology & atmospheric sciences ved/biology Coral ved/biology.organism_classification_rank.species Atoll 01 natural sciences law.invention Diagenesis Oceanography law Archipelago Period (geology) General Earth and Planetary Sciences Radiocarbon dating Geology 0105 earth and related environmental sciences Accelerator mass spectrometry |
| Zdroj: | Radiocarbon. 60:333-348 |
| ISSN: | 1945-5755 0033-8222 |
| Popis: | A robust marine radiocarbon (14C) reservoir correction (ΔR) is essential for calibrating14C dates of marine mollusks and fish bones routinely found in archaeological sites as discarded food remains and bones of terrestrial animals (including humans) with an appreciable marine diet. New ΔR values are reported for the atoll archipelago of the Marshall Islands, eastern Micronesia. Atolls consist of biogenetic material—mostly coral and foraminifera—that can be directly dated for establishing sequences of atoll emergence and islet development. After sectioning and examination using scanning electron microscopy (SEM) to screen for sample diagenesis, 6 pristine branch coral samples were selected from the modern oceanside beach, 3 archaeological sites, and islet developmental facies from Ebon Atoll (4º34′N, 168º41′E). Each sample was analyzed by U-series and accelerator mass spectrometry (AMS)14C showing no substantial temporal ΔR variations and yielding a weighted mean ΔR of 41±42 yr1spanning ~500 yr before earliest human colonization (the period when islets first became habitable) through the entire 2000-yr occupation sequence. Reliable published ΔR values for Micronesia and Δ14C data for Palmyra Island, together with our results for Ebon Atoll, indicate that the Pacific North Equatorial Counter Current is almost stable for the past 2500 yr. |
| Databáze: | OpenAIRE |
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