喜马拉雅康巴淡色花岗岩的高分异成因及 岩浆⁃热液演化特征

刘志超, 刘小驰, 俞良军, 王建刚

Highly fractionated origin and magmtic⁃hydrothermal evolution of the Kampa leucogranites in the Tethyan Himalaya

Zhichao Liu, Xiaochi Liu, Liangjun Yu, Jian'gang Wang

表3 康巴淡色花岗岩Sr?Nd?Hf同位素组成

Table 3 Sr?Nd?Hf isotope compositions of the Kamba leucogranites

13KB01 13KB03 13KB05 13KB17 GBY02 GBY37 GBY39 GBY41 87Rb/86Sr 262.353 101.414 97.447 33.823 23.239 54.733 42.839 45.563 87Sr/86Sr 0.709939 0.710788 0.756544 0.797358 0.761257 0.769585 0.793107 0.781371 2σ 0.000006 0.000005 0.000008 0.000009 0.000007 0.000019 0.000013 0.000011 (87Sr/86Sr)i 0.613061 0.673338 0.720560 0.784868 0.752675 0.749374 0.777288 0.764546 147Sm/144Nd 0.2882 0.2888 0.2017 0.2123 0.2828 0.2120 0.2630 143Nd/144Nd 0.512085 0.512176 0.512131 0.512070 0.512118 0.512136 0.512233 2σ 0.000007 0.000009 0.000006 0.000007 0.000007 0.000008 0.000007 εNd(t) -11.1 -9.3 -9.9 -11.1 -10.4 -9.8 -8.1 TDM(Ma) -2203 -1995 12430 88725 -2300 71048 -2869 TDM2 (Ma) 1765 1617 1574 1208 1711 1226 1523 fSm/Nd 0.47 0.47 0.03 0.08 0.44 0.08 0.34 176Lu/177Hf 0.0043 0.0148 0.0342 0.0559 0.0264 0.0355 0.0269 0.0348 176Hf/177Hf 0.282510 0.282528 0.282529 0.282615 0.282553 0.282604 0.282601 0.282759 2σ 0.000003 0.000003 0.000004 0.000014 0.000004 0.000018 0.000004 0.000051 εHf(t) -8.8 -8.3 -8.6 -5.9 -7.6 -6.0 -5.9 -0.5 TDM(Ma) 1148 1615 8532 -1980 3019 10838 2945 6868 TDM2 (Ma) 1655 1628 1645 1477 1584 1481 1478 1134 fLu/Hf -0.87 -0.55 0.03 0.68 -0.21 0.07 -0.19 0.05