低硅埃达克岩和高硅埃达克岩问题

摘要

低硅埃达克岩(low-SiO2 adakites,LSA,SiO2＜ 60％)和高硅埃达克岩(high-SiO2 adakites,HSA,SiO2＞60％)的术语是Martin等(2005)提出来的.本文不赞同上述分类,因为,他们的低硅埃达克岩是赞岐岩而不是埃达克岩.赞岐岩是幔源的,埃达克岩是壳源的,虽然埃达克岩可以与地幔混合形成高镁的埃达克岩,但仍然是壳源的.不应当把壳源的岩浆和幔源的岩浆混淆起来.%The terms of low-SiO2 adakite (LSA, SiO2<60%) and high-SiO2 adakite (HSA, SiO2> 60%) were put forward by Martin et al. (2005). This paper does not agree with this classification, because the low-SiO2 adakite is sanukite rather than adakite. Sanukite is a mantle source rock, whereas adakite is a crust-derived rock. Although adakite can be mixed with the mantle to form high-Mg adakite, it is still of the crust source. Crust- and mantle-derived magmas are different types of magma, so it is not proper to confuse them.