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超基性岩的定年一直是地学界的一大难题,前人大多采用Sm-Nd测年技术(如汤中立等1992;Chen J F et al.,1991),近年来,随着测试技术的进步,对早期Sm-Nd测试结果争议也较大(李献华等,2004;杨刚等2005)。由于橄榄岩属硅不饱和硅酸盐类,锆石(ZrSiO_4)矿物偏少,而斜锆石(ZrO_2)相对
The dating of ultramafic rocks has always been a major problem for geosciences. Most of them used Sm-Nd dating techniques (eg, Tang et al. 1992; Chen JF et al. 1991). In recent years, with the progress of testing techniques , The controversies over the early Sm-Nd test results are also large (Li Xianghua et al., 2004; Yang Gang et al. 2005). Because of the peridotitic silicon-unsaturated silicates, the zircon (ZrSiO 4) minerals are somewhat less and the orthorhombic zircon (ZrO 2)