Abstract The geology of the Korean Peninsula’s northern part is little known to the international community. Even though this area is a critical link between various eastern Asia terranes, its tectonic architecture and geochronological framework are still gaps in knowledge. This study reports integrated field, geochemical and geochronological characteristics of the Precambrian gneissic rocks from this region, focusing on the Rangnim Massif. The studied samples are divisible into three groups according to their field occurrence as granitic gneiss, fine-grained biotite gneiss and leuco-veins. The essential mineralogy of all these rocks is biotite (Bt), muscovite (Mu), plagioclase (Pl), K-feldspar (Kf) and quartz. The analyzed samples show high SiO2 (65.92–77.63 wt%) and Al2O3 (10.23 to 17.56 wt%) contents, low MgO and CaO. Their K2O contents is mostly higher than Na2O. SIMS (Secondary Ion Mass Spectrometry) zircon U-Pb dating of the eleven samples yields magmatic protolith ages of 2454–2567 Ma and multiple metamorphic overprintings during the earliest Paleoproterozoic (~2.45 Ga), Paleoproterozoic (1.87–1.93 Ga) and Jurassic (160 Ma). The presence of these potassic granitoids in different locations indicate the high extent maturation of Neoarchean continental crust in the Rangnim Massif. Zircon Lu-Hf isotopic results of these samples show large variations, mostly plotting between the Depleted mantle linear model line and Chondritic Uniform Reservoir (CHUR) line, but some have negative eHf(t) values. Considering that their protoliths are all crust melting products, it can be concluded that the Neoarchean magmatism incorporated both juvenile crustal components as well as a reworking of older crust. This is supported by the detection of rare early Archean xenocrysts. Based on Juvenile crust having eHf values of ~0 before 3500–3600 Ma, it is concluded that the reworked components were Eoarchean in age, not Hadean. Magmatic as well as Precambrian metamorphic pulses of the Rangnim Massif show broad similarities with the eastern North China Craton, Gyeonggi and Yeongnam Massifs and southwest Japan, which seem to suggest that they might share a coherent Precambrian basement and evolutionary history, at least before the end of late Paleoproterozoic.

中文翻译：

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朝鲜半岛北部朗宁地块太古代基底成分和变质叠印及其对中朝克拉通的构造意义

摘要 国际社会对朝鲜半岛北部的地质情况知之甚少。尽管该地区是东亚各种地体之间的重要联系，但其构造结构和地质年代框架仍然存在知识空白。本研究报告了该地区前寒武纪片麻岩的综合场、地球化学和地质年代学特征，重点是让宁地块。所研究的样品根据其野外产状可分为三组：花岗片麻岩、细粒黑云母片麻岩和无色脉。所有这些岩石的基本矿物组成是黑云母 (Bt)、白云母 (Mu)、斜长石 (Pl)、钾长石 (Kf) 和石英。分析的样品显示高 SiO2 (65.92–77.63 wt%) 和 Al2O3 (10.23 to 17.56 wt%) 含量，低 MgO 和 CaO。它们的 K2O 含量大多高于 Na2O。11 个样品的 SIMS（二次离子质谱）锆石 U-Pb 定年产生 2454-2567 Ma 的岩浆原岩年龄和最早的古元古代（~2.45 Ga）、古元古代（1.87-1.93 Ga）和侏罗纪（16 Ga）期间的多次变质叠印嘛）。这些钾质花岗岩在不同位置的存在表明朗宁地块新太古代大陆地壳的高度成熟。这些样品的锆石 Lu-Hf 同位素结果显示出很大的变化，主要绘制在耗尽地幔线性模型线和球粒陨石均匀储层 (CHUR) 线之间，但有些具有负的 eHf(t) 值。考虑到它们的原岩都是地壳熔融产物，可以得出结论，新太古代岩浆活动包含了年轻地壳成分和旧地壳的改造。这得到了罕见的早期太古宙异种晶体的检测的支持。基于在 3500-3600 Ma 之前具有 ~0 的 eHf 值的幼年地壳，可以得出结论，重新加工的组件在年龄上属于始太古代，而不是冥界。朗宁地块的岩浆和前寒武纪变质脉动与华北克拉通东部、京畿和岭南地块以及日本西南部有着广泛的相似性，这似乎表明它们可能至少在末期之前共享一个连贯的前寒武纪基底和演化历史古元古代晚期。得出的结论是，重新加工的组件在年龄上属于始太古代，而不是冥界。朗宁地块的岩浆和前寒武纪变质脉动与华北克拉通东部、京畿和岭南地块以及日本西南部有着广泛的相似性，这似乎表明它们可能至少在末期之前共享一个连贯的前寒武纪基底和演化历史古元古代晚期。得出的结论是，重新加工的组件在年龄上属于始太古代，而不是冥界。兰宁地块的岩浆和前寒武纪变质脉动与华北克拉通东部、京畿和岭南地块以及日本西南部有着广泛的相似性，这似乎表明它们可能至少在末期之前共享一个连贯的前寒武纪基底和演化历史古元古代晚期。