We present, for the first time, comprehensive Re-Os isotopic data for 23 late Cenozoic intraplate basaltic rocks from seven locations (Mount Baekdu, Jeongok, Baengnyeong Island, Ganseong, Ullueng Island, Dok Island, and Jeju Island) on the Korean Peninsula. The Re-Os isotopic system serves as an important tracer of processes such as the reworking of old continental lithosphere or the deep crustal recycling. We use these data to investigate the role of the lithospheric mantle, which is currently debated as a source of the basaltic rocks, and to constrain the source lithology. The initial Os/Os ratios of the Korean basalts range from 0.1321 to 0.6455, with γ values of 4.0–408.3. The γ values do not show a simple correlation with Sr-Nd-Hf-Pb isotope compositions. There are no significant correlations between MgO contents and Os/Os ratios or Os contents and Os/Os ratios, which demonstrate that crustal assimilation did not produce the supra-chondritic Os isotopic compositions. The γ values of the Korean basalts are much higher than previously published γ of spinel peridotite xenoliths (−9.1 to +1.2) hosted in the basalts, indicating the subcontinental lithospheric mantle was not the main source of the basaltic magmatism. The combination of the Os and Sr-Nd-Hf-Pb isotopic compositions suggests that recycled oceanic crust (potentially Pacific oceanic lithosphere), along with pelagic sediments, which possibly reside in the mantle transition zone, is the enriched component with the supra-chondritic Os isotopic composition in the mantle source of the Korean basalts.

中文翻译：

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韩国晚新生代板内玄武岩的铼-锇同位素系统学：对地幔来源中回收的板状材料的影响


我们首次提供了来自朝鲜半岛七个地点（白头山、全谷、白翎岛、甘城、郁陵岛、德岛和济州岛）的 23 个晚新生代板内玄武岩的综合铼锇同位素数据。铼锇同位素系统是旧大陆岩石圈改造或深部地壳循环等过程的重要示踪剂。我们利用这些数据来研究岩石圈地幔的作用，并限制源岩性，岩石圈地幔目前被争论为玄武岩的来源。韩国玄武岩的初始Os/Os比范围为0.1321至0.6455，γ值为4.0至408.3。 γ 值并未显示出与 Sr-Nd-Hf-Pb 同位素组成的简单相关性。 MgO含量与Os/Os比值或Os含量与Os/Os比值之间不存在显着相关性，这表明地壳同化并没有产生球粒状上Os同位素组成。韩国玄武岩的γ值远高于先前发表的玄武岩中尖晶石橄榄岩捕虏体的γ值（-9.1至+1.2），表明次大陆岩石圈地幔不是玄武岩岩浆作用的主要来源。 Os 和 Sr-Nd-Hf-Pb 同位素组成的组合表明，再循环的洋壳（可能是太平洋岩石圈）以及可能位于地幔过渡带的远洋沉积物是超球粒岩的富集成分。朝鲜玄武岩地幔源区的骨同位素组成。