Startseite Naturwissenschaften Direct evidence for the source of uranium in the Baiyanghe deposit from accessory mineral alteration in the Yangzhuang granite porphyry, Xinjiang Province, northwest China
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Direct evidence for the source of uranium in the Baiyanghe deposit from accessory mineral alteration in the Yangzhuang granite porphyry, Xinjiang Province, northwest China

  • Long Zhang , Xiaofeng Li EMAIL logo , Guo Wang und Mou Wang
Veröffentlicht/Copyright: 29. Oktober 2020
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 105 Heft 10

Abstract

Circumstantial evidence for the sources of uranium in ore deposits may be drawn from the study of deposit geochemistry and mineralogy. However, direct evidence supporting uranium leaching from source rocks has rarely been found. This study investigates the source of uranium in the Baiyanghe deposit in the Xiemisitai Mountains, northwest China. The main uranium ore bodies occur as fracture-fillings along contact zones between the Yangzhuang granite porphyry and the Devonian volcanic rocks. Zircon, thorite, columbite-(Mn), and bastnäsite are the dominant accessory minerals that host uranium in the granite porphyry. In situ columbite-(Mn) LA-ICP-MS U-Pb dating yields a weighted mean 206Pb/238U age of 310 ± 4 Ma, suggesting that the Yangzhuang granite porphyry was emplaced during the Late Carboniferous. Backscattered electron (BSE) images reveal that various degrees of alteration of these same accessory minerals may be observed in the granite porphyry, and the altered domains of these minerals have lower BSE intensities compared to the unaltered domains. Results indicate that the altered domains of zircon grains have lower concentrations of Zr, Si, and U, and higher concentrations of Y, Fe, Ca, and P relative to the unaltered domains, and the altered domains of columbite-(Mn) grains are enriched in Ti and Fe and are depleted in Nb, Ta, Mn, U, and Zr. The altered domains of thorite grains have higher concentrations of Zr, Fe, Ca, Nb, and P, and lower Th and U compared to those of the relict domains. The petrochemical data indicate that the granite porphyry experienced losses in U, Be, F, Ba, Sr, Pb, Zr, Mo, Nb, Ta, and Hf during alteration. These results suggest that the past-magmatic hydrothermal fluids might be responsible for the mobilization of uranium form minerals in the granite porphyry. It is concluded that U-bearing accessory minerals in the granite porphyry were the primary source of uranium, and that post-magmatic hydrothermal processes caused remobilization and significant localized enrichment of the uranium to form high-grade ores as fracture-fillings along its contacts.

Keywords: U-bearing accessory minerals; hydrothermal alteration; element maps; uranium source; Yangzhuang granite porphyry; Baiyanghe volcanic deposit

Present address: Institute of Geology and Geophysics, Chinese Academy of Sciences, No. 19, Beitucheng Western Road, Chaoyang District, Beijing 100029, China

Acknowledgments and Funding

We are very grateful to the editor Hongwu Xu and associate editor Callum Hetherington, as well as three anonymous referees for their constructive comments that have significantly improved the manuscript. We also thank Zhenyu Chen from the Institute of Mineral Resources, Chinese Academy of Geological Sciences, for his help with electron-microprobe data collection. We thank Jeffrey de Fourestier from the Key State Laboratory of Nuclear Resources and Environment, East China University of Technology, for polishing this manuscript and his helpful comments. This study was financially supported by the Key Research Program of the Institute of Geology and Geophysics, CAS (Grant No. IGGCAS-201902), the National Natural Science Foundation of China (Grant No. 41972087), and the China National Nuclear Corporation (Grant No. LTD1603).

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Received: 2019-11-26
Accepted: 2020-03-05
Published Online: 2020-10-29
Published in Print: 2020-10-27

© 2020 Walter de Gruyter GmbH, Berlin/Boston

Artikel in diesem Heft

  1. Roebling Medal Paper
  2. The effects of solid-solid phase equilibria on the oxygen fugacity of the upper mantle
  3. Structural and spectroscopic study of the kieserite-dwornikite solid-solution series, (Mg,Ni)SO4·H2O, at ambient and low temperatures, with cosmochemical implications for icy moons and Mars
  4. Mineral compositions and thermobarometry of basalts and boninites recovered during IODP Expedition 352 to the Bonin forearc
  5. An evolutionary system of mineralogy. Part II: Interstellar and solar nebula primary condensation mineralogy (>4.565 Ga)
  6. Swelling capacity of mixed talc-like/stevensite layers in white/green clay infillings (“deweylite”/“garnierite”) from serpentine veins of faulted peridotites, New Caledonia
  7. Experimental observations of TiO2 activity in rutile-undersaturated melts
  8. Direct evidence for the source of uranium in the Baiyanghe deposit from accessory mineral alteration in the Yangzhuang granite porphyry, Xinjiang Province, northwest China
  9. Extraction of high-silica granites from an upper crustal magma reservoir: Insights from the Narusongduo magmatic system, Gangdese arc
  10. “EosFit-Pinc: A simple GUI for host-inclusion elastic thermobarometry” byAngel et al. (2017)—Discussion
  11. “EosFit-Pinc: A simple GUI for host-inclusion elastic thermobarometry” —Reply to Zhong et al
  12. Letter
  13. Synthesis and crystal structure of Pb-dominant tourmaline
  14. Element loss to platinum capsules in high-temperature–pressure experiments
  15. New Mineral Names
  16. Book Review
  17. Book Review: Fundamental Planetary Science: Physics, Chemistry and Habitability
https://doi.org/10.2138/am-2020-7383
Schlagwörter für diesen Artikel
U-bearing accessory minerals; hydrothermal alteration; element maps; uranium source; Yangzhuang granite porphyry; Baiyanghe volcanic deposit

Artikel in diesem Heft

  1. Roebling Medal Paper
  2. The effects of solid-solid phase equilibria on the oxygen fugacity of the upper mantle
  3. Structural and spectroscopic study of the kieserite-dwornikite solid-solution series, (Mg,Ni)SO4·H2O, at ambient and low temperatures, with cosmochemical implications for icy moons and Mars
  4. Mineral compositions and thermobarometry of basalts and boninites recovered during IODP Expedition 352 to the Bonin forearc
  5. An evolutionary system of mineralogy. Part II: Interstellar and solar nebula primary condensation mineralogy (>4.565 Ga)
  6. Swelling capacity of mixed talc-like/stevensite layers in white/green clay infillings (“deweylite”/“garnierite”) from serpentine veins of faulted peridotites, New Caledonia
  7. Experimental observations of TiO2 activity in rutile-undersaturated melts
  8. Direct evidence for the source of uranium in the Baiyanghe deposit from accessory mineral alteration in the Yangzhuang granite porphyry, Xinjiang Province, northwest China
  9. Extraction of high-silica granites from an upper crustal magma reservoir: Insights from the Narusongduo magmatic system, Gangdese arc
  10. “EosFit-Pinc: A simple GUI for host-inclusion elastic thermobarometry” byAngel et al. (2017)—Discussion
  11. “EosFit-Pinc: A simple GUI for host-inclusion elastic thermobarometry” —Reply to Zhong et al
  12. Letter
  13. Synthesis and crystal structure of Pb-dominant tourmaline
  14. Element loss to platinum capsules in high-temperature–pressure experiments
  15. New Mineral Names
  16. Book Review
  17. Book Review: Fundamental Planetary Science: Physics, Chemistry and Habitability
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