<b>Supplementary Datasets for "Tracing crustal thickness evolution </b><b>of the Rodinia’s peripheral orogen</b><b>s as recorded in the Yangtze Block, South China</b><b>" submitted to Global and Planetary Change</b>
收藏资源简介：
The Tonian (ca. 1000–720 Ma) magmatic orogens along western and northern margins of the Yangtze Block represent critical components of the long-lived peripheral orogenic system of Rodinia supercontinent. Reconstructing their crustal thickness evolution is essential for understanding the paleotectonic and paleoenvironment of Neoproterozoic Earth. In this study, we integrate Eu/Eu*-in-zircon crustal thickness proxy with U-Pb-Hf-O isotopes from in Late Tonian and Cryogenian strata to revisit Rodinia’s peripheral orogenesis as recorded in the Yangtze Block, South China. The results indicate the average orogenic crust underwent a rapid thickening from ~40 to ~60 km during ca. 970–920 Ma. Zircons of this age mainly present positive ε<sub>Hf</sub>(t) (+8.0–+11.1) and mantle-like δ<sup>18</sup>O (4.80–6.33 ‰) values. Combined with geologic observations, this thickening may result from both juvenile magmatic addition and crustal shortening. During ca. 860–750 Ma, a period of significant flare-ups of continental arc magmatism occurred, the crustal thickness fluctuated slightly and stabilized around 50 km. Zircons from this interval exhibit highly variable ε<sub>Hf</sub>(t) (-22.2–+10.2) and δ<sup>18</sup>O (1.57–10.60 ‰) values, reflecting active crustal recycling and mantle-crust differentiation. The maintenance of a constant average crustal thickness during this time likely reflects a dynamic balance between crustal thickening and thinning processes. Furthermore, our findings suggest that the Tonian peripheral orogens of Rodinia may represent a key transitional phase in the evolution of both crustal thickness and geothermobaric regimes, bridging the orogenic styles of the Mesoproterozoic and Phanerozoic eras.
