摘要
埃达克岩提出之初是指那些源于俯冲带环境下,玄武质洋壳部分熔融形成的火山岩或者侵入岩。随后的研究发现,埃达克岩不仅仅只形成于岛弧环境,而具有多种成因模型:俯冲洋壳熔融、增厚下地壳熔融、拆沉下地壳熔融、玄武质岩浆的地壳混染和低压分离结晶(AFC)、高压分离结晶、岩浆混合作用以及地幔橄榄岩的直接熔融都可以形成与埃达克岩地球化学特征相同的岩石。这些研究成果丰富了我们对岛弧及下地壳岩浆活动的认识。
In the original intention, the word adakite means the volcanic or intrusive rock formed by the par- tial melting of basaltic ocean crust in subduction zone environment. According to the study afterwards, it is discov- ered that the adakite is not only formed in the island arc environment but also has many genesis models： all melting of subduction ocean crust; melting of thickening lower crust, melting of detachment sinking lower crust; crust contamination of basaltic magma and low P fractional crystallization （AFC）, high P fractional crystallization, magma mixing and direct melting of mantle peridotite can form the rock same as adakite in geochemistry. These re- suits have enriched our knowledge of magma activity of island arc and lower crust.
出处
《云南地质》
2014年第3期309-313,共5页
Yunnan Geology
