Sm-Nd Dating Method

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Samarium-neodymium dating is a radiometric dating method useful for determining the ages of rocks and meteorites, based on the radioactive decay of a long-lived samarium isotope (147 Sm ) to a radiogenic neodymium isotope (143 Nd ) .
Sm-Nd method Based on the decay: 147Sm 143Nd T 1/2 = 106 Ga (l=6 .54x10-12y-1) virtually same equation as for Rb/Sr system Sm-Nd method is useful in Ca-bearing rocks because REE substitute for Ca and garnet (high Sm/Nd ratio) Sm-Nd method relatively resistant to alteration ( 1) 144 147 0 144 143 144 143 + - = e t Nd Nd Sm l
The Sm-Nd system is useful for determining crystallization ages of igneous and metamorphic rocks . It has proven especially valuable for dating mafic and ultramafic rocks that are, in general, difficult to date using other methods . The principles of Sm-Nd dating are identical to those of Rb-Sr dating , which have been discussed in detail elsewhere (e .
Abstract . DefinitionSamarium-neodymium dating uses the radioactive decay of 147Sm to 143Nd and 146Sm to 142Nd to measure the age of rocks and minerals and to trace and date geochemical processes . . .
Other Dating Methods . Sm - Nd Dating . 147 Sm → 143 Nd . λ = 6 .54 x 10-12 /yr, τ 1/2 = 1 .06 x 10 11 yr . 144 Nd is stable and non-radiogenic, so we can write the isochron equation as:
The high pressure (HP) metamorphic age has been dated to HP rocks from the Sanggan area, North China craton . We have got garnet+whole rock isochron ages of (1 842±38) Ma for HP granulite, and (1 856 ±26) Ma for HP amphibolite . The Sm-Nd whole rock isochron of HP granulites give out an age of (1870±150) Ma with Nd depleted mantle model age of . . .
In the present work, trace element composition, Sm-Nd isotope dating , and Sr isotope of scheelite from the Longshan Sb-Au deposit are used to constrain the genesis of the deposit . Based on mineral assemblages and geological characteristics, two types of scheelites can be distinguished (Sch1 and Sch2) .
Samarium- Nd isotope dating of scheelite mineral separates is an established method of constraining the timing of mineralization . Here, we show the successful application of in-situ split stream LA-ICP-MS Sm-Nd isotopes and trace element abundances to determine scheelite paragenesis within
U-Pb and Sm-Nd methods waxed and then waned in popularity in the 1980s . Again, Woodmorappe quoted a field expert who said, "Each of the above dating systems had at some stage . . .been alleged to be immune from isotopic resetting under subsolidus conditions .
CHONDRITES & ACHONDRITES Many stony meteorites have been dated by the Sm -Ndmethod by analyzing mineral fraction separated fromindividual specimens . The isotopic evolution of Nd in the earth is represented by amodel that assumes that the Sm/Nd ratio of the earth isequal to that of chondritic meteorites .
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Sm-Nd Dating Method

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