Echoes of the Center-West Steppe

Across the windswept basins of central-western Mongolia, monumental stone mounds and khirigsuur tombs mark the Late Bronze Age horizon. Archaeological fieldwork at sites such as Khar Sairiin Am (Bayankhongor), Urgun Shireg Tomb 3 (Uvs), Khoit Tsenkheriin gol barrow 3 (Khovd) and Khavtsal II Tomb 1 (Khövsgöl) reveals repeated reuse of burial mounds and rich mortuary architecture between ca. 1414 and 846 BCE. These stone constructions—often paired with wooden elements and small offerings—reflect a regional practice that ties landscape, ritual, and memory.

Material culture and burial patterns suggest communities rooted in mobile pastoralism with ritual investment in tomb-building. Limited evidence points to local development from earlier Bronze Age traditions in Mongolia rather than wholesale population replacement. Radiocarbon-calibrated dates from the sampled individuals anchor this cultural expression in the central-west landscape during the Late Bronze Age Center West 4 phase. Given the modest sample size, interpretations of population origins remain provisional; however, the spatial clustering of tomb types and repeated burial gestures indicate a shared mortuary idiom across these aimags.

Genome-wide and uniparental data from 10 individuals provide a first genetic portrait of the Mongolia_LBA_CenterWest_4 grouping. Y-chromosome haplogroup Q was the most frequent (4/10), consistent with deep-rooted East Siberian/Inner Asian male lineages common on the steppe. Single occurrences of C and N likely reflect additional northern or northeastern connections: haplogroup C is often observed among Mongolic and Altaic-associated groups, while N can indicate more northerly Siberian ancestry. Maternal lineages are dominated by East Eurasian mtDNA: A (3), C (2), and D (2), which are widespread across northern Asia and mirror the regional archaeological setting.

Two maternal haplotypes, K and U, point to sporadic western Eurasian maternal inputs; these could reflect long-distance connections across the steppe or residual ancestry from earlier millennia. Archaeological and genetic concordance suggests a largely local East Eurasian population with some admixture events, yet the sample count is small (n=10). Consequently, population-level inferences should be treated as preliminary. Future denser sampling and genome-wide analyses (including autosomal ancestry components and isotope data) will clarify the timing and scale of gene flow and social patterns such as patrilocality or kinship-based burial clustering.