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- W4285605674 endingPage "106802" @default.
- W4285605674 startingPage "106802" @default.
- W4285605674 abstract "The eastern Tibetan Plateau has the highest topographic relief on Earth and is studded with abundant mineral reserves. However, the orogenic evolution and its link to mineral resources are unclear. The Zhongdian block, as the convergent center of several blocks during the final closure of the Paleotethys, is one of the most important regions for exploring the evolution of the eastern Tibetan Plateau. The geochemical parameters of intermediate-composition magmatic rocks can reflect mineral assemblages in the lower crust and can be used to constrain crustal thickness. Here, we show that the whole rock Sr/Y and (La/Yb)N and zircon Eu/Eu* values for the Late Triassic and Late Cretaceous intermediate to silicic magmatic rocks reveal two changes in crustal thickness of the Zhongdian block. The crustal thickness of the Zhongdian block increased to >70 km during ca. 230 to 210 Ma, while it decreased from >70 km to ~55 km during ca. 90 to 80 Ma. The two changes in crustal thickness could have benefited the formation of Late Triassic subduction-related porphyry copper deposits and Late Cretaceous collision-related porphyry molybdenum deposits. By quantitatively constraining the paleoelevation of the Zhongdian block, we interpret the existence of a paleoplateau (~5500 m in elevation) during the Early Jurassic–Early Cretaceous and a relict peneplain (~3500 m) during the Late Cretaceous to the present day. This is supported by the absence of Jurassic–Cretaceous strata and the decrease in the erosion rate during the Late Cretaceous. The slowing of the erosion rate caused by the decrease in elevation during the Late Cretaceous may be key to the preservation of these Mesozoic porphyry ore deposits. Quantifying crustal thickness is of great significance for understanding how orogenesis impacts elevation, magmatism, and mineralization in the eastern Tibetan Plateau." @default.
- W4285605674 created "2022-07-16" @default.
- W4285605674 creator A5015577975 @default.
- W4285605674 creator A5016673919 @default.
- W4285605674 creator A5019069101 @default.
- W4285605674 creator A5037684325 @default.
- W4285605674 date "2022-10-01" @default.
- W4285605674 modified "2023-10-04" @default.
- W4285605674 title "Changes in crustal thickness of Zhongdian block, eastern Tibetan Plateau, and implications for formation and preservation of porphyry ore deposits" @default.
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