安大略阿比提比(Abitibi)绿岩带火山岩的均匀(除花岗质岩石附近外)低级变质作用和巨大地层视厚度(～40公里),被解释是铲状正断裂的结果。紧接着断裂之后发生从拉斑质到钙碱质最后到钙碱性科马提质的火山旋回。地壳的断裂发生在花岗质岩石侵位的初期,在张应力作用下形成。这类花岗质岩基与钙碱性火山岩同源。在火山喷 The uniform (except for the granitic rocks) lower-grade metamorphism of volcanic rocks in Abitibi greenstone volcanic rocks and the huge formation apparent thickness (~ 40 km) in Ontario are interpreted as the result of spatulate normal faults. Immediately after the fracture, a volcanic cycle took place from the platy to calcareous to the calc-alkaline kamabina. The crustal rupture occurred during the initial stage of emplacement of granitic rocks under the action of tensile stress. Such granitic basement is homologous with calc-alkaline volcanic rocks. Spurt in the volcano