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![Geological map (a) and section (b) of the Huogezhuang Fe deposit (modified after Beijing Bureau of Geology and Mineral Resources 1991).]()
![Concentrations of selected elements in altered and unaltered zones of apatite in the Huogezhuang BIF-hosted Fe deposit.]()
![Representative backscattered electron images and U-Pb concordia plots for apatite from the Huogezhuang BIF-hosted Fe deposit. (a) High-grade Fe ore (Sample D01DB6). (b) BIF (Sample D01DB5).]()
![Schematic model for BIF-hosted high-grade magnetite mineralization and modification of the Huogezhuang Fe deposit (after Shi et al. 2019a; Li et al. 2019). (a) BIF deposition. (b) BIF deposition at ca. 2500–1900 Ma, and high-grade magnetite mineralization during retrogressive metamorphism, modification, and alteration of BIFs at <1900 Ma.]()
![(a) Chondrite-normalized REE patterns of apatite in the Huogezhuang BIF-hosted Fe deposit. Chondrite normalization values are after Sun and McDonough (1989). (b) Total REE contents in altered and unaltered zones of apatite. (c) δCe and δEu values in altered and unaltered zones of apatite. (d) Concentrations of selected elements in altered and unaltered zones of apatite.]()
![Geochronology of high-grade Fe ore and BIF from the Huogezhuang BIF-hosted Fe deposit showing: (a) U-Pb concordia plot for high-grade Fe ore (sample D01B3) and representative CL images of zircons; (b) U-Pb concordia plot for BIF (sample D01B5) and representative CL images of zircons; and (c) combined probability density plot for samples D01B3 and D01B5.]()
![Geological sections, field photographs and hand specimens of the ore samples and wall rock from the Huogezhuang BIF-hosted Fe deposit. (a–b) Geological sections showing the ore body with porphyritic granite, chlorite-alteration, and faults. (c) Garnet and calcite distributed in the contact of ore body and garnet gneiss. (d) Calcite vein from the high-grade Fe ore with chlorite-alteration. (e) BIF. (f) High-grade Fe ore.]()
![Representative microphotographs under cross-polarized light and backscattered electron images of ore samples from the Huogezhuang BIF-hosted Fe deposit. (a) Magnetite-rich and quartz layers with granulite-to amphibolite-facies (clinopyroxene and hornblende) and greenschistfacies minerals (chlorite and epidote). (b) Magnetite, quartz, apatite, and epidote. (c) Magnetite showing destruction texture. (d–e) Magnetite and coexisting apatite. (f–i) Apatite showing partly altered zones with greenschist-facies minerals (epidote, allanite, and titanite). Mineral abbreviations: Mt = magnetite; Ap = apatite; Qtz = quartz; Cpx = clinopyroxene; Hbl = hornblende; Pl = plagioclase; Chl = chlorite; Ep = epidote; Aln = allanite; Ttn = titanite.]()
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Huogezhuang Deposit
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Journal Article
Modified magnetite and hydrothermal apatite in banded iron-formations and implications for high-grade Fe mineralization during retrogressive metamorphism
Journal: American Mineralogist
Publisher: Mineralogical Society of America
Published: 01 February 2024
American Mineralogist (2024) 109 (2): 286–301.
... deposits hosted by BIFs. In this study, we have investigated the geochemical composition of modified magnetite and hydrothermal apatite and in situ U-Pb geochronology on apatite from the Huogezhuang BIF-hosted Fe deposit in northeastern China. The magnetite in metamorphosed BIF is modified, locally...
FIGURES
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Includes: Supplemental Content
Image
Geological map ( a ) and section ( b ) of the Huogezhuang Fe deposit (modif...
in Modified magnetite and hydrothermal apatite in banded iron-formations and implications for high-grade Fe mineralization during retrogressive metamorphism
> American Mineralogist
Published: 01 February 2024
Figure 2. Geological map ( a ) and section ( b ) of the Huogezhuang Fe deposit (modified after Beijing Bureau of Geology and Mineral Resources 1991 ).
Image
Concentrations of selected elements in altered and unaltered zones of apati...
in Modified magnetite and hydrothermal apatite in banded iron-formations and implications for high-grade Fe mineralization during retrogressive metamorphism
> American Mineralogist
Published: 01 February 2024
Figure 13. Concentrations of selected elements in altered and unaltered zones of apatite in the Huogezhuang BIF-hosted Fe deposit.
Image
Representative backscattered electron images and U-Pb concordia plots for a...
in Modified magnetite and hydrothermal apatite in banded iron-formations and implications for high-grade Fe mineralization during retrogressive metamorphism
> American Mineralogist
Published: 01 February 2024
Figure 9. Representative backscattered electron images and U-Pb concordia plots for apatite from the Huogezhuang BIF-hosted Fe deposit. ( a ) High-grade Fe ore (Sample D01DB6). ( b ) BIF (Sample D01DB5).
Image
Schematic model for BIF-hosted high-grade magnetite mineralization and modi...
in Modified magnetite and hydrothermal apatite in banded iron-formations and implications for high-grade Fe mineralization during retrogressive metamorphism
> American Mineralogist
Published: 01 February 2024
Figure 15. Schematic model for BIF-hosted high-grade magnetite mineralization and modification of the Huogezhuang Fe deposit (after Shi et al. 2019a ; Li et al. 2019 ). ( a ) BIF deposition. ( b ) BIF deposition at ca. 2500–1900 Ma, and high-grade magnetite mineralization during retrogressive
Image
( a ) Chondrite-normalized REE patterns of apatite in the Huogezhuang BIF-h...
in Modified magnetite and hydrothermal apatite in banded iron-formations and implications for high-grade Fe mineralization during retrogressive metamorphism
> American Mineralogist
Published: 01 February 2024
Figure 12. ( a ) Chondrite-normalized REE patterns of apatite in the Huogezhuang BIF-hosted Fe deposit. Chondrite normalization values are after Sun and McDonough (1989) . ( b ) Total REE contents in altered and unaltered zones of apatite. ( c ) δCe and δEu values in altered and unaltered zones
Image
Geochronology of high-grade Fe ore and BIF from the Huogezhuang BIF-hosted ...
in Modified magnetite and hydrothermal apatite in banded iron-formations and implications for high-grade Fe mineralization during retrogressive metamorphism
> American Mineralogist
Published: 01 February 2024
Figure 10. Geochronology of high-grade Fe ore and BIF from the Huogezhuang BIF-hosted Fe deposit showing: ( a ) U-Pb concordia plot for high-grade Fe ore (sample D01B3) and representative CL images of zircons; ( b ) U-Pb concordia plot for BIF (sample D01B5) and representative CL images
Image
Geological sections, field photographs and hand specimens of the ore sample...
in Modified magnetite and hydrothermal apatite in banded iron-formations and implications for high-grade Fe mineralization during retrogressive metamorphism
> American Mineralogist
Published: 01 February 2024
Figure 3. Geological sections, field photographs and hand specimens of the ore samples and wall rock from the Huogezhuang BIF-hosted Fe deposit. ( a – b ) Geological sections showing the ore body with porphyritic granite, chlorite-alteration, and faults. ( c ) Garnet and calcite distributed
Image
Representative microphotographs under cross-polarized light and backscatter...
in Modified magnetite and hydrothermal apatite in banded iron-formations and implications for high-grade Fe mineralization during retrogressive metamorphism
> American Mineralogist
Published: 01 February 2024
Figure 4. Representative microphotographs under cross-polarized light and backscattered electron images of ore samples from the Huogezhuang BIF-hosted Fe deposit. ( a ) Magnetite-rich and quartz layers with granulite-to amphibolite-facies (clinopyroxene and hornblende) and greenschistfacies
