The metamorphic history of the Mesoarchean Amikoq Layered Complex within the Akia terrane of SW Greenland was characterised by electron microprobe mineral data and detailed petrography on 12 representative samples, integrated with zircon U–Pb geochronology and petrology. The complex intruded into a >3004 Ma supracrustal association now consisting of granoblastic metabasites with subordinate quartz-rich gneiss. Supracrustal host rocks contain a relict high-temperature assemblage of orthopyroxene–clinopyroxene (± pigeonite exsolution lamellae, exsolved at ~975–1010°C), which is interpreted to pre-date the Amikoq intrusion. Cumulate to granoblastic-textured rocks of the main Amikoq Layered Complex range modally from leuconorite to melanorite, orthopyroxenite to harzburgite/dunite and rare hornblende melagabbro. Observed mineralogy of main complex noritic lithologies is essentially relict igneous with orthopyroxene–biotite and hornblende–plagioclase thermometers yielding temperatures of ~800–1070°C. An anatectic zircon megacryst from a patchy quartzo–feldspathic leucosome hosted in an orthopyroxene-dominated Amikoq rock reflects local anatexis at peak metamorphic P–T conditions and yields an intrusion minimum age of 3004 ± 9 Ma. Field observations indicate local anatexis of orthopyroxene-dominated lithologies, possibly indicating a post-intrusion peak temperature of >900°C. The last preserved stages of retrogression are recorded in paragneiss plagioclase–garnet, biotite–garnet and host rock ilmenite–magnetite pairs (≤3 kbar and ~380–560°C).

The Amikoq Complex intruded a MORB-like crustal section and the former remained relatively undisturbed in terms of modal mineralogy. Preservation of igneous textures and mineralogy are related to an anhydrous, high-grade metamorphic history that essentially mimics igneous crystallisation conditions, whereas local high-strain zones acted as fluid pathways resulting in hydrous breakdown of igneous minerals. There is no evidence of equilibration of the intrusion at sub-amphibolite-facies conditions.

西南格陵兰岛阿基亚地层内的中古统层阿米科克层状复合体的变质历史特征在于电子微探针矿物数据和12个代表性样品的详细岩石学，以及锆石U–Pb年代学和岩石学。该复合体侵入到一个> 3004 Ma的上壳组合中，该组合现在由粒细胞变质岩和次要的富含石英的片麻岩组成。壳上基质岩含有邻位高温石-斜向辉石的残余高温集合体（±鸽皮石溶出片，在〜975-1010°C溶出），这被解释为Amikoq侵入之前。累积到主要Amikoq层状复合体的颗粒状纹理岩石，范围从白闪石到黑铁矿，正辉石到Harzburgite / Dunite和稀有的hornblende melagabbro。观察到的主要复杂诺西岩性的矿物学基本上与邻辉石-黑云母和角闪石-斜长石温度计相伴，其温度约为800-1070°C。来自于邻苯二茂占主导地位的Amikoq岩石中的斑片状石英-长石质白质体的锆石锆石巨晶反映出峰值变质处的局部麻醉P–T条件产生的最小侵入年龄为3004±9 Ma。现场观察表明，邻苯二酚为主的岩性存在局部麻醉作用，可能表明侵入后的峰值温度> 900°C。倒退的最后一个保存阶段记录在斜长石斜长石-石榴石，黑云母-石榴石和基质岩石钛铁矿-磁铁矿对中（≤3kbar和〜380-560°C）。

Amikoq情结侵入了一个类似于MORB的地壳断面，而就模态矿物学而言，前者仍然相对不受干扰。火成岩质地和矿物学的保存与无水，高品位的变质史有关，该史基本上模拟了火成岩的结晶条件，而局部的高应变区则作为流体通道，导致火成岩矿物的含水分解。没有证据表明在亚闪石岩相条件下浸润平衡。