Examining surface water δ18O and δ2H values in the western Central Andes: A watershed moment for anthropological mobility studies

被引:5
作者
Milton, Emily B. P. [1 ,2 ,8 ]
Stansell, Nathan D. [3 ]
Bocherens, Herve [4 ,5 ]
Brownlee, Annalis [6 ]
Chala-Aldana, Doebereiner [7 ]
Rademaker, Kurt [1 ,2 ]
机构
[1] Michigan State Univ, Dept Anthropol, E Lansing, MI USA
[2] Michigan State Univ, Environm Sci & Policy Program, E Lansing, MI USA
[3] Northern Illinois Univ, Dept Earth Atmosphere & Environm, De Kalb, IL USA
[4] Univ Tubingen, Dept Geosci, Biogeol, Tubingen, Germany
[5] Univ Tubingen, Senckenberg Ctr Human Evolut & Palaeoenvironment, Tubingen, Germany
[6] Univ Alaska Anchorage, Environm & Nat Resources Inst Stable Isotope Lab, Anchorage, AK USA
[7] Univ Tubingen, Inst Prehist Early Hist & Medieval Archaeol, Tubingen, Germany
[8] 655 Auditorium Rd,Baker Hall,Room 355, E Lansing, MI 48824 USA
基金
美国国家科学基金会;
关键词
South America; Stable isotopes; Biogeochemistry; Paleomobility; Migration; Mountain hydrology; ISOTOPE COMPOSITION; OXYGEN ISOTOPES; GEOGRAPHIC ORIGINS; COLLAGEN TURNOVER; HYDROGEN ISOTOPES; STABLE-ISOTOPES; BONE PHOSPHATE; EARLY HOLOCENE; TOOTH ENAMEL; STRONTIUM;
D O I
10.1016/j.jas.2022.105655
中图分类号
Q98 [人类学];
学科分类号
030303 ;
摘要
Oxygen isotopes are commonly applied to study archaeological human and animal mobility among the vertical ecological zones of the Central Andes in South America. Such research assumes that oxygen and hydrogen isotopes in meteoric waters demonstrate an inverse relationship with elevation. However, because the primary source of precipitation in the Central Andes is the Atlantic Ocean, this expectation is likely complicated by surface-level processes on the western Andean slope. We evaluate the spatial patterning of stable isotope values in surface waters along a coast-highland transect in southern Peru (similar to 15-17 degrees S). Surface water delta O-18 and delta H-2 values in the study area are consistent with regional and global meteoric waters. However, lowland and highland surface waters demonstrate wide variability and overlapping ranges of surface water isotope values. Therefore, it is challenging to discern the origin of surface waters based on elevation alone. Rather, surface water delta O-18 and delta H-2 values appear to reflect hydrologic processes including seasonality, stream order, catchment size, and distance from the source. We identify the "Watershed Effect," which precludes the use of delta O-18 and delta H-2 in Andean bioarchaeological studies of inter-zonal mobility. Moreover, changing hydroclimate over the Holocene and present sampling precision for biological analytes confound existing interpretations of delta O-18 derived from archaeological bioapatite. Given the regional complexities of delta O-18(water) presented here, isotopic assessments of human paleomobility require better baseline data than those currently available for the Central Andes. We contend that previous archaeological datasets using delta O-18(bioapante) to assess mobility between high and low elevations should be re-evaluated. Further, future studies should provide adequate baseline data to justify archaeological analyses and support subsequent interpretations.
引用
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页数:12
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