Introduction
Luminescence dating has become one of the most widely applied geochronological techniques in Quaternary science, providing chronologies to constrain geomorphic processes and to date archaeological sites across timescales ranging from decades to several hundred thousand years. Over the past several decades, luminescence methods have rapidly evolved through advances in instrumentation, measurement protocols, statistical approaches to equivalent dose estimation, and new applications beyond geochronology. These developments have enabled increasingly robust methods and chronologies for a wide range of depositional environments and have expanded the role of luminescence dating in addressing fundamental questions about Earth-surface processes and environmental change.
The 2024 New World Luminescence Dating Workshop, hosted at the Desert Research Institute in Reno, Nevada, brought together researchers applying luminescence dating methods to a diverse array of applications in the Earth sciences. The meeting provided a forum for discussion of methodological advances, emerging applications, and continual challenges in the field. The papers included in this special issue reflect these themes and collectively provide a snapshot of the current state of luminescence research across the Americas and beyond. The contributions highlight the growing diversity of applications, continued refinement of analytical approaches, and increasing integration of luminescence methods with other geochronological and sedimentological tools.
Historical development of luminescence geochronology
Luminescence dating emerged in the mid-twentieth century through the recognition that minerals such as quartz and feldspar accumulate trapped charge in response to ionizing radiation. Early efforts primarily focused on thermoluminescence (TL) measurements and were closely tied to the development of custom-built instrumentation and experimental protocols within individual laboratories. These early innovations established the theoretical and methodological foundations for modern luminescence dating.
A historical perspective on the development of luminescence instrumentation and measurement approaches is provided by Lian et al. (Reference Lian, Spooner, Bailiff, Smith, Thomsen and Godfrey-Smith2026), who document the evolution of the field from early bespoke laboratory-built TL systems to modern automated luminescence readers capable of measuring optically stimulated luminescence (OSL) and infrared stimulated luminescence (IRSL) signals. The authors emphasize how innovations in stimulation sources, detection systems, and measurement protocols enabled the development of widely adopted approaches such as single-aliquot regenerative-dose (SAR) procedures. This historical context provides an important framework for understanding the methodological advances and expanding applications presented in this special issue.
Expanding applications across Quaternary environments
Many of the contributions to this special issue demonstrate the continued expansion of luminescence dating into a wide range of depositional and geomorphic settings. These include aeolian systems, glacial and ice-marginal environments, fluvial deposits, volcanic terrains, archaeological materials, and debris-flow deposits. Collectively, these studies illustrate the versatility of luminescence methods and their increasing importance for understanding Quaternary environmental change.
Several studies focus on sedimentary systems associated with aeolian environments. Hanson and Joeckel (Reference Hanson and Joeckel2025) present OSL ages from lunettes associated with deflation basins in the rainwater basin region of Nebraska, demonstrating that most lunette deposition occurred during Marine Isotope Stage (MIS) 3 under conditions that alternated between those that favored basin deflation and their occasional inundation. Similarly, Loope et al. (Reference Loope, Antinao, Hanson, Jacobs and Grimley2026) reconstruct Late Pleistocene aeolian sand activity near the southern margin of the Laurentide Ice Sheet in Indiana, documenting phases of dune activity linked to glacial outwash dynamics and rapid environmental change during the last deglaciation.
Applications of luminescence dating to older Quaternary deposits are explored by Antinao et al. (Reference Antinao, Loope and Jacobs2026), who evaluate quartz OSL and feldspar post-infrared–infrared stimulated luminescence (post-IR IRSL) methods for dating MIS 6 ice-marginal sediments. Their results demonstrate that conventional quartz OSL protocols may significantly underestimate ages for some older glacial deposits, while feldspar post-IR IRSL methods yield results more consistent with independent stratigraphic and cosmogenic constraints. Likewise, Mahan et al. (Reference Mahan, Mead, Hanson, Krolczyk and Jass2026) apply feldspar IRSL dating to sediments from the Mammoth Site bone bed in Hot Springs, South Dakota. Whereas earlier radiocarbon analyses of mammoth bone apatite suggested deposition during MIS 2–3, the new post-IR IRSL ages ranging from ∼131 to 232 ka instead indicate that the bone-bearing sediments accumulated during MIS 6 and 7. These results suggest that the mammoth remains were deposited through episodic runoff events along the margins of a sinkhole pond and demonstrate the value of luminescence methods for resolving conflicting chronologies in complex Quaternary deposits.
Other studies extend luminescence dating to contexts involving thermal resetting or anthropogenic heating. Frederick et al. (Reference Frederick, Rodrigues, Bateman, Norment, Costa, Oksanen and Gregory2026) investigate the potential for luminescence dating of burned clay objects from an archaeological site in Texas, providing a direct comparison between luminescence dating of heated clay objects and radiocarbon dates from associated charcoal. In volcanic environments, Cordero et al. (Reference Cordero, Brown, Harrison and Hurwitz2026) use multiple luminescence signals to date hydrothermal explosion deposits in the Yellowstone Plateau Volcanic Field, demonstrating that luminescence methods can provide valuable constraints on the timing of hydrothermal hazards in these types of settings.
Luminescence methods are also applied to reconstruct the timing of geologic hazards. Joshi et al. (Reference Joshi, Brown, Argueta, Moon and Blisniuk2026) apply single grain post-IR IRSL dating of K-feldspar to alluvial deposits along the Mission Creek strand of the San Andreas Fault in southern California, showing that deposits previously inferred to be several thousand years old were emplaced within the last millennium. These young depositional ages indicate rapid Holocene resurfacing of the valley floor, suggesting that the absence of geomorphic evidence for recent fault rupture does not necessarily imply fault inactivity and has important implications for seismic hazard assessment. Wood et al. (Reference Wood, Mahan, East, Bilderback, Krolczyk, Rasmussen, Zyatitsky and Hallas2026) combine luminescence dating with radiocarbon analyses to reconstruct a chronology of debris flows in the Klamath Mountains of northern California, documenting repeated debris-flow events during the Late Holocene and highlighting the role of wildfire in triggering these events.
Signal behavior and controls on luminescence sensitivity
Understanding the physical and geological factors controlling luminescence signal behavior remains a key topic area for luminescence geochronological research. Several contributions to this issue examine processes that influence luminescence sensitivity, bleaching behavior, and OSL signal stability in natural sediments.
Oliveira Sawakuchi et al. (Reference Oliveira Sawakuchi, Jain, Kook, Mineli, Parra and Mazur Chiessi2026) investigate the development of OSL sensitivity in quartz grains through cycles of illumination and irradiation, demonstrating that repeated burial and exposure cycles alone are unlikely to account for the high sensitivities observed in many natural quartz sediments. Complementary work by Mills et al. (Reference Mills, Tanski, Rittenour, Pazzaglia, Pavano and Roberge2026) explores the geomorphic and pedogenic controls on quartz OSL sensitivity in a tectonically active catchment. Their results suggest that pedogenic processes and sediment residence times may enhance luminescence sensitivity, offering a key insight into sensitizing processes useful for sediment tracing and provenance applications.
Other contributions explore alternative luminescence signals and measurement protocols. Devi et al. (Reference Devi, Singhal, Khanduri, Chauhan and Singhvi2025) evaluate the use of a post-violet infrared SAR protocol for polymineral fine- and coarse-grained samples, demonstrating improved bleachability and reproducibility compared with traditional IRSL approaches. These developments highlight the continuing evolution of luminescence measurement techniques and their potential to address challenges associated with signal instability and incomplete bleaching.
Improving dose-rate characterization and analytical workflows
Accurate estimation of environmental dose rates remains essential for reliable luminescence age calculations. Several studies in this issue address practical approaches to improving dose-rate characterization and sample preparation.
Strange et al. (Reference Strange, Rittenour, Tanski and Woznick2026) demonstrate how scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) can be used to assess mineral purity, identify feldspar phases, and estimate internal potassium concentrations in feldspar separates. These measurements provide improved constraints on internal beta dose contributions and highlight the value of integrating mineralogical analyses into luminescence workflows.
Other presented research evaluates potential effects of analytical procedures on luminescence signals. Woor et al. (Reference Woor, Hughes, D’Arcy, Lian, Stacey and Enkin2025) examine whether common geophysical analyses of sediment cores, such as X-radiography and gamma-ray logging, may influence luminescence measurements. Their results indicate that these techniques impart negligible radiation doses to samples, inspiring confidence that such analyses can be incorporated into sediment core studies without compromising luminescence signals.
Community tools and emerging resources
In addition to methodological advances, the luminescence community has increasingly emphasized the development of shared computational tools and resources. Brown (Reference Brown2026) introduces a graphical luminescence simulation tool designed to model the effects of sunlight exposure, burial duration, and thermal events on luminescence signals. Such tools provide valuable opportunities for exploring luminescence behavior and may help bridge the gap between theoretical models and empirical observations.
Future directions for luminescence research
The studies presented in this special issue highlight both the maturity of luminescence geochronology and the continuing evolution of luminescence dating methods. Advances in measurement protocols, improved understanding of luminescence signal behavior, and expanding applications across diverse depositional environments continue to strengthen the role of luminescence dating in Quaternary science.
Important challenges nevertheless remain for luminescence geochronology. Continued progress will depend on improving the understanding of mineral-specific signal behavior and the geological processes that influence luminescence sensitivity and stability. Variability in quartz and feldspar signals, problems associated with incomplete or post-burial bleaching, and uncertainties in environmental dose-rate reconstruction remain central issues that require continued methodological refinement. Advances in mineralogical characterization, improved statistical approaches, and expanded experimental studies of luminescence signal development will be critical for addressing these challenges. Additionally, the increasing application of luminescence methods alongside other geochronological techniques provides valuable opportunities to test chronologies and develop more robust reconstructions of Quaternary landscapes.
The contributions to this special issue reflect the collaborative and interdisciplinary nature of the luminescence community. Together, they illustrate how luminescence methods continue to advance our understanding of Quaternary landscapes, environmental change, and Earth-surface processes.
