Green core clinopyroxenes are reported from the basanites of the Petpenoun volcanoes of the Noun Plain, in the Cameroon volcanic line (CVL). These clinopyroxenes have augite and/or diopside rims and mantles, and green cores with variable chemical composition. Compositionally, three kinds of green cores are distinguished: (i) wollastonite-hedenbergite cores (green core I); (ii) diopside cores (green core II); and (iii) augite cores (green core III). The wollastonite-hedenbergite green cores are identified for the first time in the mafic lavas of the CVL. The three types of green core clinopyroxenes are characterized by a significant enrichment in iron and a corresponding decrease in magnesium, compared with their mantles or rims. These compositional patterns of green cores exhibit an inverse zonation. The coexistence of several populations of clinopyroxenes with distinct compositions in the same sample suite is attributed to the mixing between a mafic and a more evolved melt. Based on petrological, mineralogical, and geochemical studies, we propose two origins to explain the varied occurrence of green core clinopyroxenes in this study: (i) the augite and diopside green cores precipitated from relatively evolved melts which have been mixed with their present host magmas, and (ii) the wollastonite-hedenbergite green cores precipitated from more differentiated melts which have been mixed also with mafic magma. These results provide new constraints on the evolution of the recent lavas in the Noun Plain, Cameroon volcanic line.

喀麦隆火山线（CVL）的Nono平原的Petpenoun火山的basanites报道了绿色核心斜辉石。这些斜茂铁具有辉石和/或透辉石边缘和地幔，以及具有可变化学组成的生芯。从结构上讲，可以区分三种生芯：（i）硅灰石-海伦贝格岩芯（I绿芯）；（ii）透辉石芯（绿色芯II）；（iii）辉石岩心（绿色岩心III）。在CVL的镁铁质熔岩中首次发现了硅灰石-海登贝格绿色核。三种类型的绿色核心环吡rox烯的特征是与地幔或轮缘相比，铁明显富集，镁含量相应降低。这些绿色核心的组成模式显示出反向分区。在同一样品套件中，具有不同组成的数个环吡咯酮的共存归因于铁镁铁矿和析出更多的熔体之间的混合。基于岩石学，矿物学和地球化学研究，我们提出了两个起源来解释本研究中绿芯斜向辉绿岩的不同发生：（i）从相对演化的熔体中析出的闪辉石和透辉石绿芯与它们目前的宿主岩浆混合（ii）硅灰石-变质岩绿芯是从分化程度更高的熔体中沉淀出来的，这些熔体也与铁镁质岩浆混合。这些结果对喀麦隆努诺平原火山岩中最近熔岩的演化提供了新的限制。