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Articles in this issue will describe the nature of cometary inorganic phases, volatiles, notable water, and organics.As will be shown in this issue, the relationships between the organics and the volatile inventories of terrestrial planets are critical.However, there are often local, sub-millimetre, sources of radiation heterogeneity that adversely affect a desired luminescence age.For the past 15 years, researchers have been developing Monte Carlo simulations and computer software that can correct for these heterogeneities.Dating, in geology, determining a chronology or calendar of events in the history of Earth, using to a large degree the evidence of organic evolution in the sedimentary rocks accumulated through geologic time in marine and continental environments.To date past events, processes, formations, and fossil organisms, geologists employ a variety of techniques.Now, however, promising results from calcite luminescence dating have been achieved from an unexpected source: the opercula grown by certain species of snail.Coupled with innovations in luminescence imaging systems, snail opercula offer an exciting new approach that may finally unlock calcite’s potential for dating.
Surface processes affect the critical zone, where life interacts with the land surface, and are archived in sediment records.These include some that establish a relative chronology in which occurrences can be placed in the correct sequence relative to one another or to some known succession of events.Radiometric dating and certain other approaches are used to provide absolute chronologies in terms of years before the present.Luminescence dating provides an age estimate for sediment deposition and can provide dates to calculate rates and recurrence intervals of natural hazards and Earth-surface processes.
This method has produced robust age estimates from a wide range of terrestrial, marine, tectonic, and archaeological settings.
Luminescence thermochronometry determines the timing and rate at which electrons are trapped and thermally released in minerals, in response to in situ radiation and rock cooling.