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Grain-scale zircon Hf isotope heterogeneity inherited from sediment-metasomatized mantle: Geochemical and Nd-Hf-Pb-O isotopic constraints on Early Cretaceous intrusions in central Lhasa Terrane, Tibetan Plateau

  • Ming-Jian Li , Yun-Chuan Zeng ORCID logo , Massimo Tiepolo , Federico Farina , Ji-Feng Xu , Feng Huang , Xi-Jun Liu , Qin Chen and Yuan Ma
Published/Copyright: August 31, 2023
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Abstract

Clarifying the mechanism of recycling of pre-existing continental crustal materials into the source of mantle-derived magma is a challenging efort that can be of great value to improving our understanding of mantle processes and continental crust growth. This study presents an integrated investigation of whole-rock and mineral geochemical and Nd-Hf-O-Pb isotopic data for dolerites and diorites intruded in the central Lhasa Terrane of Tibetan Plateau at ca. 120 Ma (zircon U-Pb ages). These intrusions have similar distributions of trace elements that are characterized by depletion in Nb-Ta relative to Th, Ba, and U, and moderately negative whole-rock εNd(t) (–5.0 to –1.7) values. Magmatic zircon shows dramatically variable εHf(t) values (from –5.0 to +13.7 in the same rock, including up to 12 epsilon unit variability in single grains). On the other hand, the zircon δ18O values are relatively uniform (+6.0‰ to +7.7‰). The constant 208Pb/206Pb values of clinopyroxene crystallized at ca. 500–900 MPa suggest no contamination with lower continental crust. The lack of covariation between Hf and O isotopes from the same grains, and the lack of relationship between Hf isotopes and trace elements (e.g., Hf, Th/U, and Yb/Gd) in the magmatic zircons, together with the absence of ancient zircon xenocrysts, imply limited upper crustal contamination. In combination with high-whole-rock Th/La (>0.29) ratios, we interpret the zircon Hf isotope heterogeneity as inherited from a depleted asthenospheric mantle with the addition of 1–4% Hf from isotopically heterogeneous sediments. Our study therefore emphasizes the need for caution when using complex Hf isotopic zonation in zircon as an argument for intracrustal hybridization of two end-member magmas derived from distinct reservoirs. In addition, the high-Zr/Y ratios and no negative Zr-Hf anomalies of the Aruo intrusions imply a high surface temperature of the down going slab that was able to fully dissolve zircons in the subducted sediments. This requires a special geodynamic condition that was most likely related to the steepening of flatly subducted Neo-Tethyan lithosphere at ca. 120 Ma according to a synthesis of regional tectonic-magmatic-sedimentary records.

Funding statement: This research is supported by: the Natural Science Foundation of China (42121002); the Second Tibetan Plateau Scientific Expedition (STEP) program (2019QZKK0702); the Fundamental Research Funds for the Central Universities (376202107 and 292019063); the National Key and Development Project of China (2020YFA0714800); the Natural Science Foundation of China (92055208, 42273045, and 41903034), and the 111Project of the China Ministry of Science and Technology (BP0719021). Ming-Jian Li is supported by a scholarship from the China Scholarship Council (202106400045).

Acknowledgments

We are grateful to Christopher Spencer and an anonymous reviewer for their insightful reviews and to Paul Tomascak for his excellent editorial work, which substantially improved the manuscript. Assistance from Ding-Shuai Xue, Dan-Ping Zhang, Bing-Yu Gao, Wen-Jun Li, Yong-Hai Yuan, Hong-Xia Yu, Zheng-Lin Li, Yin-Hui Zhang, Le Zhang, Pei-Zhi Wang, and Hao-Ran Dou are sincerely acknowledged during the geochemical analyses.

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Received: 2022-02-28
Accepted: 2022-09-22
Published Online: 2023-08-31
Published in Print: 2023-09-26

© 2023 by Mineralogical Society of America

Articles in the same Issue

  1. Fluorine-rich mafic lower crust in the southern Rocky Mountains: The role of pre-enrichment in generating fluorine-rich silicic magmas and porphyry Mo deposits
  2. Apatite in brachinites: Insights into thermal history and halogen evolution
  3. A high-pressure structural transition of norsethite-type BaFe(CO3)2: Comparison with BaMg(CO3)2 and BaMn(CO3)2
  4. An evolutionary system of mineralogy, Part VII: The evolution of the igneous minerals (>2500 Ma)
  5. Oriented secondary magnetite micro-inclusions in plagioclase from oceanic gabbro
  6. A multi-methodological study of the bastnäsite-synchysite polysomatic series: Tips and tricks of polysome identification and the origin of syntactic intergrowths
  7. Petrogenesis of Chang’E-5 mare basalts: Clues from the trace elements in plagioclase
  8. Experimental investigation of trace element partitioning between amphibole and alkali basaltic melt: Toward a more general partitioning model with implications for amphibole fractionation at deep crustal levels
  9. Grain-scale zircon Hf isotope heterogeneity inherited from sediment-metasomatized mantle: Geochemical and Nd-Hf-Pb-O isotopic constraints on Early Cretaceous intrusions in central Lhasa Terrane, Tibetan Plateau
  10. Mechanism and kinetics of the pseudomorphic replacement of anhydrite by calcium phosphate phases at hydrothermal conditions
  11. Vacancy infilling during the crystallization of Fe-deficient hematite: An in situ synchrotron X-ray diffraction study of non-classical crystal growth
  12. Simulated diagenesis of the iron-silica precipitates in banded iron formations
  13. Wave vector and field vector orientation dependence of Fe K pre-edge X-ray absorption features in clinopyroxenes
  14. Structure and compressibility of Fe-bearing Al-phase D
  15. Synthesis of boehmite-type GaOOH: A new polymorph of Ga oxyhydroxide and geochemical implications
  16. Scheelite U-Pb geochronology and trace element geochemistry fingerprint W mineralization in the giant Zhuxi W deposit, South China
  17. A rare sekaninaite occurrence in the Nenana Coal Basin, Alaska Range, Alaska
  18. Slyudyankaite, Na28Ca4(Si24Al24O96)(SO4)6(S6)1/3(CO2)·2H2O, a new sodalite-group mineral from the Malo-Bystrinskoe lazurite deposit, Baikal Lake area, Russia
  19. Ruizhongite, (Ag2□)Pb3Ge2S8, a thiogermanate mineral from the Wusihe Pb-Zn deposit, Sichuan Province, Southwest China
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