Chlorine 36 dating


It is an excellent way of directly dating glaciated regions.It is particularly useful in Antarctica[1], because of a number of factors[2]: Cosmogenic nuclide dating is effective over short to long timescales (1,000-10,000,000 years), depending on which isotope you are dating.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.The surface erosion rate is usually poorly constrained; thus an apparent exposure age is usually calculated for a plausible range of erosion rates.The systematics of chlorine-36 production and its application to surface exposure dating are described by Zedra and Phillips (2000).Cl mass balance for recharge estimation Chloride is chemically inert and remains conservative during passage through the unsaturated zone and records the rainfall signature modified by evapotranspiration, or the record of human impacts through pollution.For example, it can be used to estimate groundwater recharge in semi-arid and arid drylands, where the recharge rate is generally low and water balance techniques are not applicable.

This long period of applicability is an added advantage of cosmogenic nuclide dating.Cl can chemically be extracted from any kind of rock or mineral that contains at least one of these target elements, such as limestone, Ca-/K-feldspar or Ca-pyroxene.We try to avoid rocks with high chlorine concentrations because of the complex Cl).Background We think of a battery today as a source of portable power, but it is no exaggeration to say that the battery is one of the most important inventions in the history of mankind.Volta's pile was at first a technical curiosity but this new electrochemical phenomenon very quickly opened the door to new branches of both physics and chemistry and a myriad of discoveries, inventions and applications.Chloride has two stable isotopes (35Cl and 37Cl) and one cosmogenic isotope (Cl, has a long half-life (T1/2=301,000 yr), making it useful in dating groundwaters up to 1 million years old. Most natural variation in 37Cl values in hydrologic systems are related to diffusion processes.

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