Eoarchean rocks in the Napier Complex of East Antarctica are largely known from a few localities in the western Tula Mountains of Enderby Land. Zircon from trondhjemitic and mafic gneisses from Aker Peaks in Kemp Land, 200 km further east, were analysed by secondary ion mass spectrometry (SIMS), yielding concordant UPb dates between 3860 and 3700 Ma, which can be attributed to magmatic and possibly metamorphic activity. Concurrent analysis of ²⁰⁷Pb/²⁰⁶Pb ratios and LuHf isotopes in the trondhjemitic sample by laser ablation ICPMS provide initial ε_Hf(t) estimates for this age range that are slightly sub-chondritic (ca 0 to −2). This can be attributed to the incorporation of older crust into the magmatic protoliths of the gneisses, although there is no requirement that this crustal source be older than Eoarchean. Much scatter in the UPb dataset is attributable to isotopic disturbance of Pb during high-temperature metamorphism at 2.5 Ga, and if not corrected for, can lead to overestimation of model crust formation ages, a critical problem in the search for evidence of Hadean crust in Eoarchean rocks, and for estimating the timing and rate of ancient continental growth.

南极东部纳皮尔复合体中的欧陶统岩石在恩德比土地的西部图拉山的一些地方广为人知。通过二次离子质谱（SIMS）分析了更远东边200 km的肯普兰（Kemp Land）的长生菊和镁铁质片麻岩中的锆石和镁铁质片麻岩，产生了3860至3700 Ma一致的U Pb日期，这可能归因于岩浆活动和可能的变质活动。 。的并行分析²⁰⁷的Pb / ²⁰⁶的Pb的比率和路Hf构成的奥长花岗样品中的同位素通过激光烧蚀ICPMS提供初始ε _HF（t）的该年龄范围是略微子球粒估计（CA0至-2）。这可以归因于将较早的地壳结合到片麻岩的岩浆原岩中，尽管并没有要求该地壳的来源要早于欧陶统。U Pb数据集中的大部分散布归因于2.5 Ga高温变质过程中Pb的同位素扰动，如果不进行校正，可能导致模型地壳形成年龄的高估，这是寻找Hadean地壳证据的关键问题在欧亚大陆的岩石中，用于估算古代大陆增长的时间和速度。