Mengling Li’s scientific contributions

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Publications (1)


Figure 2. Photos of granite porphyries B02 and B10. The (a) and (b) are natural outcrops of granite porphyries.
Figure 3. Photomicrographs of selected samples from granite porphyries B02 (a,b) and B10 (c,d). Pl: plagioclase; Qtz: quartz; Py: pyrite.
Figure 4. Representative cathodoluminescence (CL) images and 206 Pb/ 238 U ages of zircon from granite porphyries B02 and B10.
Figure 5. U-Pb concordia diagrams and weighted mean graph for zircon from granite porphyries. (a,b) granite porphyry B02; (c,d) granite porphyry B10. The units for the mean numbers are Ma.
Figure 7. Major and trace element Harker variation diagrams showing the magmatic evolution of granite porphyries B02 and B10. Pl: plagioclase, Hbl: hornblende, Bt: biotite, Kfs: K-feldspar. (a-h) variation trend of TiO2, Al2O3, Fe2O3 t , MgO, CaO, Na2O, K2O and P2O5 with SiO2 in granite porphyries; (i,j) variation trend of Ba and Rb with Sr in granite porphyries.

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Genesis and Tectonic Implications of Early Cretaceous Granites in the Haobugao Area, Southern Great Xing’an Range: Insights from Zircon U–Pb Geochronology, Hf Isotopic Composition, and Petrochemistry
  • Article
  • Full-text available

November 2024

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Minerals

Mengling Li

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He’nan Yu

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Yi Tian

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Zhenjun Sun

In the Huanggangliang–Ganzhuermiao metallogenic belt in the southern Great Xing’an Range, the Haobugao Pb‒Zn deposit is the most widespread skarn-type polymetallic deposit. The observed mineralization processes in this area are closely associated with both magmatic and tectonic activity. The zircon U‒Pb ages of two granitoid phases are 134.0 ± 0.6 Ma and 133.4 ± 0.9 Ma (Early Cretaceous). High SiO2 content (average mass fractions of 77.98 wt.% and 73.25 wt.%), high alkalinity (average mass fractions of 6.19 wt.% and 8.78 wt.%), and low CaO levels (average mass fractions of 0.16 wt.% and 0.12 wt.%) are characteristic of these rocks. They are also enriched in high-field-strength elements (HFSEs) (Th, U, Ta, Zr, Hf, etc.) and depleted in large ion lithophile elements (LILEs) (Ba, Sr, etc.). Furthermore, the Nb/Ta ratios (7.80~8.82, 10.00~10.83) point to a crustal origin of the magma. The zircon Hf isotopic compositions suggest that the melting of young crust derived from Meso-Neoproterozoic and Neoproterozoic depleted mantle gave rise to the magma in these granite porphyries. These rocks formed in an extensional environment driven by the subduction and retreat of the Paleo-Pacific plate during the Early Cretaceous.

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