秘鲁海岸岩基侵入在南美板块的边缘,它的出露平行于现存的深海沟,主体位于扩张边缘盆地的轴部,盆地内有早白垩世所形成的火山熔岩和火山碎屑岩,这些“初始”基性岩形成新地壳,岩基即侵入其中。沿这条火山—深成岩线早已出现的高热流,可以通过对基本上无变形的埋藏变质作用的研究得到证实,而这种变质作用伴有轻微的挤压相。含角闪石的早期辉长岩是构成这种新地壳的主要组分,并且继而标明火山—深成岩线超出了边缘盆地的范围。它们代表了由地幔楔状体部分熔融所成的拉斑玄武质的岩 Permian intrusion into the coast of the South American plate on the coast of Peru, its exposure parallel to the existing deep trench, the main body is located in the axis of the expansion of the margin basin, the basin has the Early Cretaceous formed volcanic lava and volcaniclastic rocks, these “ Initial ”basic rock to form a new crust, which intruded into the rock base. The high heat flow that has already occurred along this volcano-deep diagenetic line can be confirmed by a study of a substantially undeformed burial metamorphism accompanied by a slight crustal phase. Early gabbro-bearing gabbro was the major component of this new crust, and then marked that the volcanic-plutonic line exceeded the marginal basin. They represent thylakoite rocks formed by partial melting of mantle wedges