This study reports the mineralogy and petrology, together with the major and trace element composition of pyroxenes, garnets and apatite from ijolite series rocks occurring at the Prairie Lake carbonatite complex, northwestern Ontario, with comparative data for ijolites from the Fen complex, Norway. The ijolites and calcite ijolites (hollaites) of Prairie Lake record the effects of magma mixing, crystal settling, solid-state re-equilibration and deuteric alteration. The Prairie Lake complex was formed by at least three stages of intrusion. The initial stage was predominantly biotite pyroxenite and associated coarse carbonatite veins. The second stage is represented primarily by members of the ijolite series together with meta-ijolites created by solid state re-equilibration of previously crystallized rocks. Differentiation of the magmas which formed the ijolite suite resulted in the formation of calcite ijolites (hollaites) and malignites (potassic nepheline syenites). The final stage was the intrusion of the heterogeneous carbonatites derived from different batches of carbonatite related magmas. These rocks contain xenoliths of ijolite suite rocks, pyroxene apatitite, wollastonite apatitite, and phoscorite.

Pyroxene compositions show an evolutionary trend from diopside in biotite pyroxenites through Fe-enriched diopside-augite in ijolites to aegirine in malignites. Clinopyroxene major and trace element data show that the cores of clinopyroxene in biotite pyroxenites formed as antecrysts at depth and were emplaced as part of a later event. Trace element data from pyroxenes, garnets and apatite from Prairie Lake and Fen are similar to each other and those found in carbonatite complexes worldwide. It is proposed that a continuously-filled fractionating magma chamber was not present at Prairie Lake and that the ijolite–malignite members of the complex formed as result of small intrusions of nephelinitic magma into pre-existing ijolites. Similar styles of magmatic evolution by fractional crystallization are indicated for the Prairie Lake, Fen, and Belaya Zima ijolite‑carbonatite complexes and there is no evidence that liquid immiscibility played any role in their petrogenesis.

这项研究报告了矿物学和岩石学，以及安大略省西北部Prairie Lake碳酸盐岩联合体中ijolite系列岩石中辉石，石榴石和磷灰石的主要和微量元素组成，以及挪威Fen配合物的ijolites的对比数据。草原湖的辉绿岩和方解石辉绿岩（hollaites）记录了岩浆混合，晶体沉降，固态再平衡和氘代变化的影响。草原湖综合体是由至少三个阶段的入侵形成的。初始阶段主要是黑云母辉石岩和相关的粗碳酸盐岩脉。第二阶段主要由ijolite系列的成员以及通过先前结晶的岩石的固态重新平衡所产生的亚硬沸石组成。形成ijolite套件的岩浆的分化导致了方解石ijolites（hollaites）和malignite（钾霞石正长岩）的形成。最后阶段是入侵来自不同批次的碳酸盐岩相关岩浆的非均质碳酸盐岩。这些岩石包含异黄铁矿套件岩石，辉石磷灰石，硅灰石磷灰石和磷灰石。

辉石成分显示出从黑云母辉石岩中的透辉石到在辉绿岩中富铁的透辉石-闪锌矿到恶变岩中的eg亮氨酸的演变趋势。Clinopyroxene主要和微量元素数据显示，黑云母辉石岩中的clinopyroxene的核在深处形成为前驱体，并在以后的事件中被放置。来自草原湖和芬的辉石，石榴石和磷灰石的痕量元素数据与全球碳酸盐复合物中的痕量元素数据相似。有人建议在草原湖不存在一个连续充满的分馏岩浆室，并且由于霞石岩浆少量侵入已存在的伊沃石中而形成了该复合体的伊闪石-恶性岩成员。芬河的草原湖显示出类似的通过分步结晶形成的岩浆演化样式。