While textile evidence has been used to argue for an ethnic enclave of Tiwanaku colonists within the Coyo Oriental cemetery (Kolata 1993:277; Oakland Rodman 1992), radiogenic strontium isotope analyses of human remains from Coyo Oriental suggests that first generation immigrants to the oases were rare (Knudson 2008), and it is possible that stylistically different textile groups may instead represent local lineages with differential access to Tiwanaku-style trade goods (Goldstein 2005:94).
Together, the use of radiogenic strontium isotope ratios ([sup.
As indicated in Table 3, a subset of samples for radiogenic strontium isotope analysis were analyzed on a Thermo Neptune multicollector inductively coupled plasma mass spectrometer (MCICP-MS) at the W.
All isotopic results were interpreted with reference to published baseline data on the carbon isotopic signature of various food sources in the Atacama Desert (Tieszen and Chapman 1992) and on the radiogenic strontium and stable oxygen isotopic signatures for the San Pedro de Atacama area and surrounding regions of the Tiwanaku polity (Knudson 2008, 2009).
The distribution of radiogenic strontium and stable oxygen isotope values found in the tooth enamel of individuals from the Solcor ayllu is presented in Figure 5.
Differences in radiogenic strontium isotope signatures within the San Pedro population do appear to pattern with cemetery membership.
If the slightly divergent radiogenic strontium isotope discrepancies between individuals interred in the Solcor 3 and Solcor Plaza cemeteries represent differences in the geographic origin of food sources, they may indicate that dietary distinctions between the social groups were maintained based not only on the types of foods consumed but also on the origins of food sources exploited.
Previous radiogenic strontium isotope analyses conducted on skeletal material from San Pedro de Atacama have suggested that few first-generation migrants from other regions of the Tiwanaku polity were buried within the cemeteries of Solcor 3, Coyo 3, and Coyo Oriental (Knudson 2008; Knudson and Price 2007).