Elucidating the compositions of melts from which Hadean zircons crystallized can provide insight into early crust construction. We calculated model melts using Ti-calibrated zircon/melt partition coefficients and trace element data for zircons from the Hadean, Archean, and possible analogue environments (e.g., rifts, hotspots, arcs) to constrain petrogenetic relationships. Model melts from oceanic settings (mid-ocean ridges, arcs, Iceland) showed higher heavy rare earth element (HREE) contents and shallower middle REE (MREE) to HREE/chondrite (ch) slopes than those from continental arcs and tonalite-trondhjemite-granodiorite suites (TTGs). However, Hadean and Archean model melts were consistently similar to each other and to those from continental arcs, hotspots, and TTGs (and dissimilar to oceanic settings), with depleted HREE contents and slope reversal in heaviest REEch. Despite close similarities that suggest comparable petrogenesis of Hadean and early Archean magmas from which Jack Hills detrital zircons crystallized, subtle variabilities in REEch and Zr/Hf suggest thickening crust and evolving igneous systems through time.

中文翻译：

---

锆石模型的熔体揭示了从冥王星到太古宙的地壳形成

阐明 Hadean 锆石结晶的熔体成分可以提供对早期地壳构造的深入了解。我们使用 Ti 校准的锆石/熔体分配系数和来自 Hadean、太古代和可能的类似环境（例如裂谷、热点、弧）的锆石的微量元素数据计算模型熔体，以约束成岩关系。来自海洋环境（大洋中脊、弧形、冰岛）的模型熔体显示出比大陆弧形和英云闪石-长长辉岩-花岗闪长岩组（TTG）。然而，冥王星和太古宙模型的熔体始终彼此相似，并且与来自大陆弧、热点和 TTG 的熔体相似（并且与海洋环境不同），在最重的 REEch 中，HREE 含量耗尽，斜率反转。尽管有密切的相似性表明，Jack Hills 碎屑锆石结晶形成的 Hadean 和早期太古代岩浆具有可比性的岩石成因，但 REEch 和 Zr/Hf 的细微变化表明随着时间的推移地壳增厚和火成系统演化。