4.2 Article

Quantitative assessment of the oxygen isotope composition of fish otoliths from Lake Mungo, Australia

期刊

QUATERNARY RESEARCH
卷 102, 期 -, 页码 234-246

出版社

CAMBRIDGE UNIV PRESS
DOI: 10.1017/qua.2020.121

关键词

Quaternary; Oxygen isotopes; Willandra Lakes; Otoliths; Arid zone

资金

  1. Willandra Lakes Region Aboriginal Advisory Group
  2. ARC [DP150100487, DP1092966]
  3. ARC Centre of Excellence in Australian Biodiversity and Heritage
  4. Australian Research Council [DP1092966] Funding Source: Australian Research Council

向作者/读者索取更多资源

The Willandra Lakes region in southeastern Australia is a UNESCO World Heritage Site of cultural, archaeological, and geological significance, preserving records of Aboriginal occupation and environmental change. The linkage between archaeology and palaeoenvironmental information is complicated by the different time scales represented in the data.
The Willandra Lakes region is a series of once interconnected and now-dry lake basins in the arid zone of southeastern Australia. It is a UNESCO World Heritage Site of cultural, archaeological, and geological significance, preserving records of Aboriginal occupation and environmental change stretching back to at least 50 ka. Linking the archaeology with the commensurate palaeoenvironmental information is complicated by the millennial time spans represented by the past hydrological record preserved in the sediment vs. the subdecadal evidence of each archaeological site. Oxygen isotope records across annual growth rings of fish otoliths (ear stones) can elucidate flooding and drying regimes on subannual scales. Otoliths from hearth sites (fireplaces) link lake hydrology with people eating fish on the lakeshore. Oxygen isotopic trends in hearth otoliths from the last glacial maximum (LGM) were previously interpreted in terms of high evaporation under dry conditions. However, this ignored hydrology-driven changes in water delta O-18. Here, a mass balance model is constructed to test the effect lake desiccation has on water delta O-18 and how this compares with the LGM otolith records. Based on this modelling, we suggest that Lake Mungo otolith signatures are better explained by evaporation acting on full lakes rather than by lake drying.

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