【摘要】 研究了腾冲火山岩的Pb、Sr、Nd同位素地球化学特征 :该区火山岩具高的2 0 6 Pb 2 0 4Pb、2 0 7Pb 2 0 4Pb、2 0 8　Pb 2 0 4Pb、87Sr 86 Sr和低的1 4 3Nd 1 4 4 Nd值 ,所反映的岩浆源区为EMⅡ。模拟计算表明 :地幔源中下地壳组分(含少量大洋沉积物 )占 2 0 % ,地幔源相当于榴辉岩组成。更多还原

【Abstract】 In this paper, the geochemical characteristics of Pb, Sr and Nd isotopes in the volcanic rocks in Tengchong have been studied. That the volcanic rocks have the high 206 Pb/ 204 Pb, 207 Pb/ 204 Pb, 208 Pb/ 204 Pb and 87 Sr/ 86 Sr and low 143 Nd / 144 Nd values reflects that their magmas originate from the enriched mantleⅡ(EMⅡ). Simulating computation shows that in the mantle source, the lower crust component (including a few oceanic sediments) accounts for 20% and the mantle source matches the eclogite.更多还原