RUSSIAN JOURNAL OF EARTH SCIENCES, VOL. 14, ES2002, doi:10.2205/2014ES000540, 2014

Table 9. Sm-Nd and Rb-Sr Isotopes of Ultramafic Xenoliths and Basalts of North Tien-Sahn
N Sample Sm* Nd* Rb* Sr* $^{147}$Sm/$^{144}$Nd $^{143}$Nd/$^{144}$Nd$+ 2\sigma$ $^{86}$Rbr/Sr $^{87}$Sr/$^{86}$Sr
1 TS-90-5, bas. 3.021 12.64 16.84 830.7 0.14442 0.513305$\pm$16 0.05862 0.70404$\pm$14
2 TS-90-5, bas. 26.95 37.00 17.47 846.6 0.512872$\pm$11 0.05965 0.70331$\pm$20
3 TS-90-6, bas. 37.77 41.50 0.512906$\pm$24
4 TS-90-1, bas. 38.37 1145.3 0.09700 0.70468$\pm$15
5 TS-90-1, Rpy 0.964 1.113 0.139 16.50 0.52345 0.513660$\pm$53 0.02440 0.703448$\pm$38
6 TS-90-5, Cpy 1.140 2.316 0.507 51.11 0.29762 0.513362$\pm$ 41 0.02869 0.703535$\pm$72
7 TS-90-5, Rpy 0.033 0.075 1.057 0.956 0.26199 0.512009$\pm$150 3.19869 0.708786$\pm$254
8 TS-90-5, Ol 0.010 0.027 0.368 0.367 0.14442 0.511865$\pm$115 2.90618 0.713428$\pm$440
Note: Sm, Nd, Rb and Sr concentrations in ppm (isotope dilution, precision is about 0.5%), error estimations on $^{147}$Sm/$^{144}$Nd and $^{87}$Rb/$^{86}$Sr are $\pm 0.3$% and 0.5% respectively. During the period of analytical work the weighted mean of 10 La Jolla Nd standart runs yielded 0.511852 $\pm 4$ ($2\sigma$), using 0.241579 for $^{143}$Nd/$^{144}$Nd to normalize; and NBS-987 standard yeilded 0.710255 $\pm 15$ ($2\sigma$), using 8.375210 for $^{87}$Sr/$^{86}$Sr to normalize. Total procedure blanks for Nd and Sm are 0.08 and 0.03 ng respectively, and for Sr and Rb are 0.3 and 0.4 ng respectively. All isotopic analyses were carried out on the Finningan MAT-261 solid source machine under multicollector static mode. Chemical preparation of rock samples and elements separation were done using standart procedure similar to [Richard et al., 1976] in the Precambrian Geolody and Geochemistry Institute (St. Petersburg).

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Citation: Grachev A. F., P. V. Ermolov, Yifen Wang (2014), Modification of the lithospheric mantle during the early activity of a cenozoic plume in the North Tien Shan: Evidence from mantle xenoliths in basalts, Russ. J. Earth Sci., 14, ES2002, doi:10.2205/2014ES000540.
 

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