The increase in initial Hf isotopes identified in early Mesoarchean detrital zircon is commonly interpreted as a reflection of the geodynamic transition from stagnant-lid to mobile-lid tectonics. However, given the lack of petrogenetic context, interpreting detrital zircon may lead to spurious conclusions. In this contribution, we use zircon U-Pb-Hf-O isotopic and bulk rock compositions of newly identified 3.05–2.9 Ga granitoids from the SW Yangtze Block to posit petrogenesis within an isotopically juvenile magmatic system. A statistical analysis of these data with a global igneous zircon Lu-Hf isotopic compilation reveals an increase in average initial radiogenic Hf isotopes during the Paleoarchean to Mesoarchean transition. We posit that the Earth's continental crust underwent a global rejuvenation across the Paleo-Mesoarchean transition. This rejuvenation can be explained by an independently observed increase in mantle temperatures resulting from mantle thermal evolution and does not require a change in tectonic style.

中文翻译：

---

古中太古代过渡时期大陆地壳的复兴是地幔地温升高的结果

在早期中太古代碎屑锆石中发现的初始 Hf 同位素的增加通常被解释为从静止盖构造到移动盖构造的地球动力学转变的反映。然而，由于缺乏岩石成因背景，解释碎屑锆石可能会导致虚假结论。在这篇文章中，我们使用来自西南扬子地块的新发现的 3.05-2.9 Ga 花岗岩的锆石 U-Pb-Hf-O 同位素和块体岩石成分来确定同位素幼年岩浆系统内的岩石成因。通过全球火成锆石 Lu-Hf 同位素汇编对这些数据进行统计分析，揭示了古太古代到中太古代过渡期间平均初始放射性 Hf 同位素的增加。我们假设地球大陆地壳在古中太古代过渡期间经历了全球复兴。这种复兴可以通过独立观察到的地幔热演化导致的地幔温度升高来解释，并且不需要构造样式的变化。