The REY geochemistry of phosphorites during metamorphism of the Haizhou Group, NW Yangtze Block, China

Liu, Xiqiang; Fan, Haifeng; Zhang, Hongjie; Xiao, Chaoyi; Yang, Haiying; Zhou, Ting; Tang, Yong; Shang, Pengqiang; Zhu, Chuanwei; Wen, Hanjie

doi:10.1016/j.chemgeo.2023.121781

Cited by 1 publication

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“…The meta‐phosphorites are a distinguishing feature from the metamorphic belts to the north, and constitute the main industrial phosphate ore belt in China. The phosphate units were part of an Ediacaran shallow‐marine carbonate shelf and platform (Prave et al., 2018) and can be correlated with the Hong'an Group of the Hong'an orogen (H. Liu et al., 2023; X. Liu et al., 2023) and the Haizhou Group of the Sulu orogen (S. X. Li et al., 2022; H. Liu et al., 2023; X. Liu et al., 2023). Compiled detrital zircons from the metasedimentary rocks show major age peaks at c. 2.0 Ga and subordinate peaks at c. 2.5 Ga and c. 0.8 Ga ( n = 1,317, see Section 5.2 and Figure 10), with a SCB affinity.…”

Section: Geologic Backgroundmentioning

confidence: 99%

Sedimentological Evidence for Pre‐Early Permian Continental Subduction in the Dabie Orogen, Central‐East China

Deng,

Hu,

Chew

et al. 2024

Tectonics

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How to constrain the onset of continental subduction and prograde metamorphism in an orogen remains a fundamental question. The widespread Triassic ultrahigh‐pressure (UHP) metamorphic rocks in the Dabie orogen in central‐east China are generally attributed to continental subduction. The earliest Triassic peripheral basins (the Huangshi, Yueshan and Nanjing basins) around the Dabie orogen represent an ideal archive to reconstruct the early evolution of the orogen. Here we present a multidisciplinary provenance study on these Triassic strata, including framework petrography and heavy mineral analyses combined with U‐Pb age and trace‐element analyses of detrital zircon, rutile and apatite. The abundant metapelitic lithics and muscovite grains, a heavy mineral population dominated by metamorphic apatite, and a significant Permian (270–290 Ma) age peak from U‐Pb age spectra of detrital zircon, rutile and apatite imply an Early Permian medium‐high grade metamorphic source in the uppermost structural levels of the Dabie orogen. Our provenance data indicate that the onset of northward continental subduction of the South China Block commenced no later than the Early Permian (c. 290 Ma). This event is clearly earlier and distinct from the more widespread Triassic UHP metamorphism of the Dabie orogen, suggesting that continental subduction and mountain‐basin interaction were protracted processes (>55 Myr, c. 290–235 Ma). When combined with other geological evidence, our results show that the prolonged continental subduction is not always preceded by subduction of oceanic crust.

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