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The rate of chlorine-36 production by cosmic rays (thermal and fast neutrons) depends on the concentrations of potassium (K), Calcium (Ca) and chlorine (Cl), the elevation of the rock, surface orientation, and geomagnetic latitude.The rate of accumulation of chlorine-36 depends on the balance between the production rate of chlorine-36 and on the rate of erosion of the rock surface.

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The Foothills erratics originated as one or more rock avalanches on to a valley glacier in the The penultimate glaciation of the Interior Plains, the Illinoian glaciation predates the last interglaciation ca.Isotopically enriched 35Cl was added during dissolution and isotope dilution mass spectrometry (during the accelerator mass spectrometric analysis of the chlorine-36/Cl ratio) was used to determine the Cl content.Complete major element analyses and analyses of B, Gd, U, and Th were used to compute thermal neutron profiles and chlorine-36 production from radiogenic neutrons which are produced from radioactive decay within the rock. For each sample the apparent age was calculated as a function of erosion rate for rock erosion rates varying from 0 to 5 mm per thousand years.He was employed at Caltech's Division of Geological & Planetary Sciences at the time of writing the first edition.He is presently employed in the Space & Atmospheric Sciences Group at the Los Alamos National Laboratory.2 m) of these blocks make it unlikely that the present surface of an erratic was exposed to cosmic radiation prior to falling from a mountain side onto passing ice.If one side of a block had been exposed in the cliff face, then the chances range between about 0.17 and 0.50 (for blocky and equant erratics and tabular erratics, respectively) that the pre-exposed side would be the present upper surface.The latter is considered to be minor—measured in hundreds of years.Glacial flow of 1 km/year would transport an individual erratic the 600 km length of the erratics train in 600 years.An erosion rate of less that 1 mm/1000 years is a reasonable assumption.Other variables that cannot be known in detail are the amount and over what period that the erratic changed its orientation with relation to the sky due to compaction of underlying sediments following deposition and the amount of exposure that the sampled surface received during transport from the to the site of deposition.


  1. COMMONLY USED RADIOMETRIC techniques for the dating of rocks are of two types. The first, exemplified by the K-Ar, Rb-Sr, and U-Th methods, makes use of the buildup of daughter products from primordial radionuclides. The second approach uses the decay of cosmogenic isotopes that are produced in the.

  2. Aug 13, 2015. Application of chlorine-36 technique in determining the age of modern groundwater in the Al-Zulfi province, Saudi Arabia. Challan MB12. Dating based on a 36Cl bomb pulse may be more reliable and sensitive for groundwater recharged before 1975, back as far as the mid-1950s. The above 36Cl.

  3. The few pioneer studies performed with the 36Cl method have demonstrated the validity of this theoretical framework showing that the 36Cl dating approach is a powerful way to find the number, age and displacement of the last few major earthquakes Mitchell et al. 2001; Benedetti et al. 2002, 2003; Palumbo et al. 2004.

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