Orogenic processes associated with the supercontinent cycle play crucial roles in the evolution of continental crust and surface environments. Detrital zircon records, useful archives of orogenic history, have recently suggested the possibility of orogenic quiescence during the Mesoproterozoic, the so-called . However, detrital zircon may not always provide a precise record of crustal evolution due to preservation bias. Detrital monazite, another beneficial accessory mineral, can provide key archives for a better understanding of the continental crust evolution over geological history. Here, we present the U–Pb ages, trace element abundances, and Nd isotope compositions of detrital monazites from four major rivers on the North and South American continents: the Mackenzie, Mississippi, Amazon, and Paraná rivers. The monazite U–Pb age data showed an uneven distribution, with peaks even during the Mesoproterozoic. The age distribution of the detrital monazites was broadly consistent with that of the detrital zircons in the same rivers. However, the two mineral's different occurrences and preservation potentials result in significant differences. The trace element and Nd isotope data of the detrital monazites indicate that the monazite U–Pb age peaks reflect the timing of the collision stage rather than the subduction stage. We further found cyclic secular variations in the detrital monazite Nd isotope compositions: their Nd/Nd averages shifted from juvenile to reworked crustal signatures during the interval of supercontinent assembly, including the Proterozoic period. The Nd isotope shifts can be interpreted as crustal maturation through crustal re-melting and metamorphism driven by orogenic events. The monazite U–Pb age peaks and Nd isotope shift during the Mesoproterozoic suggest sustained crustal evolution rather than orogenic quiescence during the Boring Billion.

中文翻译：

---

碎屑独居石证据证明了无聊十亿年间北美和南美大陆的地壳演化


与超大陆旋回相关的造山过程在大陆地壳和地表环境的演化中发挥着至关重要的作用。碎屑锆石记录是造山运动历史的有用档案，最近表明中元古代期间造山运动静止的可能性，即所谓的。然而，由于保存偏差，碎屑锆石可能并不总能提供地壳演化的精确记录。碎屑独居石是另一种有益的副矿物，可以为更好地了解地质历史上大陆地壳的演化提供关键档案。在这里，我们展示了来自北美和南美大陆四条主要河流（马更些河、密西西比河、亚马逊河和巴拉那河）的碎屑独居石的 U-Pb 年龄、微量元素丰度和 Nd 同位素组成。独居石U-Pb年龄数据显示分布不均匀，甚至在中元古代也出现峰值。碎屑独居石的年龄分布与同一河流中碎屑锆石的年龄分布大致一致。然而，两种矿物的产状和保存潜力不同，导致存在显着差异。碎屑独居石的微量元素和Nd同位素数据表明，独居石U-Pb年龄峰反映了碰撞阶段而不是俯冲阶段的时间。我们进一步发现了碎屑独居石 Nd 同位素组成的周期性长期变化：在超大陆聚集期间（包括元古代时期），它们的 Nd/Nd 平均值从幼年期转变为改造后的地壳特征。 Nd同位素变化可以解释为造山事件驱动的地壳重熔和变质作用导致的地壳成熟。 独居石 U-Pb 年龄峰值和中元古代时期的 Nd 同位素变化表明，在 Boring Billion 期间，地壳持续演化，而不是造山静止。