摘要
利用标准矿物分类系统进行TTG岩石组合鉴别,认为中阿尔泰地区存在早古生代中晚期(416～462 Ma)侵位的英云闪长岩-奥长花岗岩-花岗闪长岩组合(T1T2G1)及英云闪长岩-奥长花岗岩-花岗岩组合(T1T2G2)。岩石具富镁、钙而贫碱特点,Rb,Th,La,Ce,Nd,Zr,Hf相对富集,Ba,Sr,P,Nb强烈亏损。(La/Yb)N比为4.61～5.69,轻稀土分馏程度较高,为板块碰撞前(俯冲期)花岗岩,并与外蒙古地区早古生代GG侵入岩浆构造带组合,构成指示洋壳俯冲方向的TTG-GG岩石组合岩浆带。
The use of standard classification system for TTG rock mineral identification, The results show that in the late Paleozoic（416-462Ma） exist tonalite-trondhjemite-granodiorite combination （T1T2G1） and tonalite-trondhjemite-granite combination （T1T2G2）. The rock combination with magnesium rich, calcium and alkaline poor characteristics, the relative enrichment of Rb,Th,La,Ce,Nd,Zr, Hf; Ba, Sr, P, Nb strongly losses. （La/Yb）N ratio of 4.61 to 5.69, with higher levels of light rare earths fractionation, plate before collision （ subduction period） granite. And Mongolia Early Paleozoic intrusive magma tectonic belt GG combination, which indicates the oceanic crust subduction direction of TTG-GG rock assemblage zone of magma.
出处
《新疆地质》
CAS
CSCD
北大核心
2012年第2期165-171,共7页
Xinjiang Geology
基金
新疆矿产资源潜力评价项目(1212010813030)资助
