Archaeometric Investigation of Longshan-Period Pottery from Western Shangqiu, Henan: Raw Material Selection, Technological Choices, and Regional Variation

Ceramic production technology is a key indicator of craft specialization and social differentiation in Late Neolithic societies of the Central Plains. This study investigates Longshan-period pottery excavated from three representative sites, Niumugang, Zhoulonggang, and Shigudui in western Shangqiu, Henan Province. A suite of archaeometric techniques, including X-ray fluorescence (XRF), infrared spectroscopy (IR), X-ray diffraction (XRD), differential thermal analysis (DTA), and scanning electron microscopy coupled with energy-dispersive spectroscopy (SEM–EDS), was employed to systematically examine the chemical composition, mineralogical phases, thermal behavior, and microstructural characteristics of the pottery assemblages. The results reveal statistically significant differences (p < 0.05) in the contents of major ceramic-forming oxides (SiO2, Al2O3, Fe2O3, CaO, etc.) among the three sites. Pottery from the Shigudui site exhibits the narrowest range of compositional variation, whereas that from the Zhoulonggang site shows moderate dispersion. In contrast, pottery from the Niumugang site displays the widest compositional range. Mineralogical analyses indicate that pottery from all three sites is primarily composed of quartz, mica, and mullite. Notably, the high degree of mineralogical homogeneity observed in the Shigudui assemblage reflects a well-controlled and technologically mature firing process. Microstructural observations further demonstrate that pottery from the Shigudui site is characterized by uniformly dense fabrics, functionally differentiated vessels from the Zhoulonggang site exhibit clear technological stratification, and black pottery from the Niumugang site shows highly compact microstructures. These technological patterns closely correspond to differences in vessel assemblages and indicate varying levels of craft specialization and production control. Together, the results provide archaeometric evidence for the differentiation of settlement hierarchy and the development of specialized handicraft production during the Longshan period, contributing to a deeper understanding of regional technological interaction and social processes within the Longshan cultural sphere of the Central Plains.