The provenance of Middle Jurassic-Cretaceous sedimentary rocks deposited in the southern Peruvian Arequipa Basin has been investigated based on the measurement of 41 Sr-Sm-Nd isotopic compositions of sedimentary rocks, 993 U-Pb zircons ages, and 202 Lu-Hf zircon isotope data. The Middle Jurassic units are dominated by Brazilian/Pampean and Grenville/Sunsas and have juvenile to evolved Hf isotopic compositions of Permian zircons. These are consistent with an Eastern Cordillera (EC) provenance. In contrast, the Late Jurassic Labra Formation presents the first appearance of Triassic-Jurassic zircons and an increase in Famatinian zircons thus suggesting a mixed provenance from the EC and/or Altiplano and the Coastal Cordillera (CC). The Gramadal Formation shows older U-Pb zircon ages, which reflect a major contribution from Precambrian sources either from the Amazon craton or the EC thus implying a change in provenance. Another change in provenance is documented for the Hualhuani Formation with sources located both in the CC and EC. Finally, the Santonian Chilcane Formation is characterized by a large contribution of Cretaceous to Famatinian zircons indicating that it was mainly sourced from the CC. Our provenance dataset associated with the depositional setting of the Middle Jurassic to Early Cretaceous formations and the cumulative curves of zircon age distribution, indicate that the Arequipa Basin was not a back-arc setting but rather a rift-like setting. Contrary to the older formations, the Chilcane Formation is dominated by contributions from the CC in a retroarc foreland basin setting. This statement further implies that the Andean basin located eastward of the volcanic arc had evolved directly from a rift to a retroarc foreland basin and implies that the control of Andean subduction on these basins might be much younger than previously thought.

基于沉积岩41 Sr-Sm-Nd同位素组成、993 U-Pb锆石年龄和202 Lu-Hf锆石同位素测定，研究秘鲁阿雷基帕盆地南部中侏罗世-白垩统沉积岩物源数据。中侏罗世单元以巴西/潘潘和格伦维尔/Sunsas 为主，并具有二叠纪锆石的年轻到演化的 Hf 同位素组成。这些与东科迪勒拉 (EC) 出处一致。相比之下，晚侏罗世拉布拉组首次出现三叠纪-侏罗纪锆石，法马提阶锆石增加，因此表明来自 EC 和/或高原和沿海山脉 (CC) 的混合物源。Gramadal 组显示了更古老的 U-Pb 锆石年龄，这反映了来自亚马逊克拉通或欧共体的前寒武纪来源的主要贡献，因此意味着来源发生了变化。Hualhuani 组的另一个来源变化被记录在案，其来源位于 CC 和 EC。最后，Santonian Chilcane 组的特征是白垩纪对 Famatinian 锆石的大量贡献表明它主要来自 CC。我们与中侏罗世至早白垩世地层的沉积环境和锆石年龄分布累积曲线相关的物源数据集表明，阿雷基帕盆地不是弧后环境，而是类似裂谷的环境。与较旧的地层相反，Chilcane 地层主要是在弧后前陆盆地环境中来自 CC 的贡献。