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| Obsidian Hydration Project | |
|---|---|
| Name | Obsidian Hydration Project |
| Type | Research initiative |
| Founded | 1990s |
| Focus | Archaeometry, geochronology, geochemistry |
| Notable | Hydration dating techniques, DJD calibration studies |
Obsidian Hydration Project
The Obsidian Hydration Project is a concerted scientific initiative focused on developing and standardizing obsidian hydration dating and related archaeometric techniques. It links field programs, laboratory protocols, and theoretical modeling across collaborations among institutions such as Smithsonian Institution, University of California, Berkeley, University of Arizona, Australian National University, and University College London. The project interfaces with archaeological programs at sites like Çatalhöyük, Mesa Verde, Teotihuacan, Çayönü and Clovis culture localities to refine chronologies and provenance studies.
The project aims to quantify hydration rim growth in volcanic glass and to integrate findings with chronologies used by researchers at agencies including National Science Foundation, National Geographic Society, British Museum, Peabody Museum of Archaeology and Ethnology, and Los Alamos National Laboratory. It synthesizes approaches from investigators such as John F. Donahue, Edward H. McFadden, Alexander M. Shackleton, James A. Feathers, and David R. Drennan to reconcile obsidian hydration with radiometric frameworks like radiocarbon dating, argon–argon dating, and thermoluminescence.
Origins trace to comparative studies in the late 20th century when teams from University of California, Los Angeles, Harvard University, University of New Mexico, University of Tokyo, and University of Otago identified variability in hydration rates across source obsidians from provinces documented by Geological Survey of Japan, United States Geological Survey, and Geological Survey of Canada. Motivations arose from mismatches between obsidian hydration ages and established chronologies from projects at Monte Albán, Chavín de Huantar, Nabta Playa, Folsom site, and Jomon period contexts. The rationale emphasized standardization to support provenance work previously undertaken by teams linked to Peabody Museum, Field Museum of Natural History, Natural History Museum, London, Australian Museum, and Museo Nacional de Antropología.
Methodological components draw from microscopy, surface analysis, and experimental archaeology. Laboratories employ instruments from centers such as Lawrence Berkeley National Laboratory, Max Planck Institute for Evolutionary Anthropology, Scripps Institution of Oceanography, and Fraunhofer Society. Techniques include petrographic microscopy influenced by practices at Metropolitan Museum of Art, Rijksmuseum, and National Gallery of Art conservation labs; secondary ion mass spectrometry routines from Woods Hole Oceanographic Institution; and electron probe microanalysis routes developed at Massachusetts Institute of Technology and California Institute of Technology. Calibration experiments reference standards used at International Atomic Energy Agency intercomparisons.
Field sampling protocols were coordinated with excavation teams from University of Cambridge, Yale University, University of Michigan, University of Chicago, and University of Pennsylvania at stratified sites like Çatalhöyük, Çayönü, Knossos, Mesoamerica, and Aegean Bronze Age settlements. Datasets combined hydration rim thickness, surface roughness, and geochemical fingerprints tied to obsidian sources cataloged by Geological Survey of Iran, Servicio Geológico Mexicano, and Geological Survey of Western Australia. Statistical analyses utilized packages and frameworks from R Project for Statistical Computing, Python Software Foundation, and computational resources at National Center for Supercomputing Applications and Oak Ridge National Laboratory. Cross-validation with dendrochronology, luminescence dating, and paleomagnetism datasets enabled triangulation of age estimates.
Findings demonstrated systematic variation in hydration rates correlated with volcanic source chemistry (e.g., peralkaline versus peraluminous obsidians) documented in inventories from Nevada Bureau of Mines and Geology, Servicio Nacional de Geología y Minería (Chile), and Geological Survey of Japan. The project produced calibrated hydration rate curves applicable to regions studied by teams at Teotihuacan, Chaco Canyon, Anasazi, Polynesian settlement research groups, and Andean archaeology programs. Comparative work reconciled many prior discrepancies with ages from radiocarbon dating and argon–argon dating applied by laboratories at Oxford Radiocarbon Accelerator Unit and Australian Nuclear Science and Technology Organisation. Publications appeared in journals associated with Society for American Archaeology, American Antiquity, Journal of Archaeological Science, and Antiquity.
Applications extended to provenance sourcing used by curatorial institutions like British Museum, Louver Museum, and Hermitage Museum and to heritage management agencies including UNESCO and regional conservation bodies in New Zealand, Mexico, Greece, and Turkey. The project influenced archaeological field strategies at Poverty Point, Monte Verde, Gobekli Tepe, and Ban Chiang and informed museum exhibitions curated by Smithsonian Institution and Museo Nacional de Antropología. Interdisciplinary impact reached geoscience programs at Stanford University, Columbia University, and Imperial College London and contributed to training through workshops organized with UNESCO World Heritage Centre and IUGS.
Critiques emerged from researchers affiliated with University of Arizona, Australian National University, and University of California, Santa Cruz highlighting environmental variables—temperature histories, burial conditions, and post-depositional alteration—documented in case studies from Mesa Verde and Nabta Playa. Limitations include source heterogeneity reported by Geological Survey of Canada and analytical uncertainties debated at meetings of the European Association of Archaeologists and Society for Historical Archaeology. Debates continue regarding universal versus local calibration strategies, with alternative perspectives put forward by contributors from University of Copenhagen, University of Oslo, and University of Helsinki.
Category:Archaeometry