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ESS 461 Cosmic Ray Exposure Dating Cosmogenic Nuclide Lab - 413 Johnson Hall This lab will provide hands-on experience of a geochronological technique. Lectures can't convey all of the technicalities involved in the laboratory work that goes into an age determination. It‘s easy to write formulae that describe how some chemical or The chlorine-36 method for surface exposure dating relies on the accumulation of the isotope chlorine-36 produced by reactions of cosmic rays with the nuclei of K, Ca, and Cl atoms. It is one of several methods based on the accumulation of cosmogenic nuclides. The surface one to two metres of rock shield underlying rock from most types of cosmic radiation.
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Cosmogenic exposure dating Text by Carrie Patterson, MGS. Cosmogenic isotopes are created when elements in the atmosphere or earth are bombarded by high energy particles µ-mesons and protons, collectively known as cosmic rays that penetrate into the atmosphere from outer space. Cosmogenic nuclides are utilised in a wide range of applications in Earth Science concerned with establishing the timing of geological events and the rates of geological processes. Examples are dating of glacial landforms, fault scarps, rock avalanches. Cosmogenic nuclide dating is effective over short to long timescales 1,000-10,000,000 years, depending on which isotope you are dating. Different isotopes are used for different lengths of times. This long period of applicability is an added advantage of cosmogenic nuclide dating.
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Surface exposure dating is a collection of geochronological techniques for estimating the length of time that a rock has been exposed at or near Earth's surface.Surface exposure dating is used to date glacial advances and retreats, erosion history, lava flows, meteorite impacts, rock slides, fault scarps, cave development, and other geological events.It is most useful for rocks which have been exposed for between 10 years and 30,000,000 years.
Earth is constantly bombarded with primary cosmic rays, high energy charged particles — mostly protons and alpha particles.These particles interact with atoms in atmospheric gases, producing a cascade of secondary particles that may in turn interact and reduce their energies in many reactions as they pass through the atmosphere.This cascade includes a small fraction of hadrons, including neutrons.When one of these particles strikes an atom it can dislodge one or more protons and/or neutrons from that atom, producing a different element or a different isotope of the original element.
In rock and other materials of similar density, most of the cosmic ray flux is absorbed within the first meter of exposed material in reactions that produce new isotopes called cosmogenic nuclides.At Earth's surface most of these nuclides are produced by neutron spallation.Using certain cosmogenic radionuclides, scientists can date how long a particular surface has been exposed, how long a certain piece of material has been buried, or how quickly a location or drainage basin is eroding.