Chemical and boron isotopic composition of tourmaline from the Yixingzhai gold deposit, North China Craton: Proxies for ore fluids evolution and mineral exploration
-
Shao-Rui Zhao
, Hao Hu
, Xiao-Dong Deng
, Paul T. Robinson
Abstract
Tourmaline is common in magmatic-hydrothermal deposits, and its composition and boron isotope geochemistry have been widely used to fingerprint the source and evolution of hydrothermal fluids and associated metals. However, whether these chemical or boron isotopic compositions or their combinations can be used as vectors for mineral exploration remains to be explored. In this study, we documented the major and trace element compositions and boron isotopic values of tourmaline along a vertical extension (i.e., 510, 830, 1230 m above sea level, a.s.l.) of the newly discovered porphyry Au mineralization in the Hewan feldspar quartz porphyry, Yixingzhai deposit, to shed light on the evolution of the ore-forming fluid, the mechanisms of Au deposition, and potential indicators for Au exploration. Field observations showed that tourmaline in the Hewan porphyry occurred mainly as orbicules or veins and intergrew with Au-bearing pyrite, hydrothermal quartz, and some clay minerals, indicating a magmatic-hydrothermal origin. Tourmaline sampled from 510 m a.s.l. showed δ11B values (–11.5 to –9.3‰) consistent with those of the average continental crust and tourmaline in magmatic systems, which suggests that the ore-forming fluid was most likely exsolved from the host Hewan porphyry. The δ11B values became heavier upward, reaching –9.9 to –1.5‰ at 830 m and –8.0 to +6.8‰ at 1230 m a.s.l. This boron isotopic variation, integrated with increasing Fe, Mg, Na, Ca, Li, Co, and Sr but decreasing Al, U, Th, REE, Zn, and Pb contents of the tourmaline samples from deep to shallow levels, implies that the initial magmatic fluids were gradually mixed with circulating meteoric water that contained materials leached from peripheral Archean metamorphic rocks and Mesoproterozoic marine sedimentary rocks. Considering the spatial distribution of the Au grade of the porphyry, we propose that a suitable mixing proportion of magmatic and meteoric fluids caused Au deposition and accumulation. We note that tourmaline samples collected from the economic Au zones had much lower and more concentrated δ11B (–11.5 to –3.0‰), Co/(Pb+Zn) (<0.01), and Sr/ (Pb+Zn) (0.27 to 1.07) values than those in low-grade or barren zones. Coeval plutons and breccia pipes, where tourmaline also occurs, are well developed inside and outside the Yixingzhai Au mine. We suggest that the obtained parameters can potentially be used as proxies for further Au exploration in this region. This study highlights the feasibility of using the chemical and isotopic compositions of tourmaline for mineral exploration.
Acknowledgments and Funding
We thank Guo-Ping Wang from the Mineral Exploration Institute, Zijin Mining Group Co., Ltd., and Jie Lin from the GPMR for their assistance during the field investigation and lab analyses. We also thank two anonymous reviewers for their constructive comments, which helped improve the presentation of the manuscript. We extend our gratitude to Don R. Baker and Fang-Zhen Teng for handling the manuscript. This research was funded by the MOST Special Fund from the GPMR of the China University of Geosciences (Wuhan) (MSFGPMR2022-5).
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Articles in the same Issue
- Fingerprinting the source and complex history of ore fluids of a giant lode gold deposit using quartz textures and in-situ oxygen isotopes
- Cu isotope fractionation between Cu-bearing phases and hydrothermal fluids: Insights from ex situ and in situ experiments
- Barium mobility in a geothermal environment, Yellowstone National Park
- Single-crystal elasticity of humite-group minerals by Brillouin scattering
- Sulfur speciation in dacitic melts using X-ray absorption near-edge structure spectroscopy of the S K-edge (S-XANES): Consideration of radiation-induced changes and the implications for sulfur in natural arc systems
- Ab initio calculations and crystal structure simulations for mixed layer compounds from the tetradymite series
- A fast open data reduction workflow for the electron microprobe flank method to determine Fe3+/ΣFe contents in minerals
- Machine learning applied to apatite compositions for determining mineralization potential
- Reconstructing volatile exsolution in a porphyry ore-forming magma chamber: Perspectives from apatite inclusions
- Incommensurate to normal phase transition in malayaite
- Raman spectroscopic measurements on San Carlos olivine up to 14 GPa and 800 K: Implications for thermodynamic properties
- Chemical and boron isotopic composition of tourmaline from the Yixingzhai gold deposit, North China Craton: Proxies for ore fluids evolution and mineral exploration
- Tourmaline chemical and boron isotopic constraints on the magmatic-hydrothermal transition and rare-metal mineralization in alkali granitic systems
- New Mineral Names
Articles in the same Issue
- Fingerprinting the source and complex history of ore fluids of a giant lode gold deposit using quartz textures and in-situ oxygen isotopes
- Cu isotope fractionation between Cu-bearing phases and hydrothermal fluids: Insights from ex situ and in situ experiments
- Barium mobility in a geothermal environment, Yellowstone National Park
- Single-crystal elasticity of humite-group minerals by Brillouin scattering
- Sulfur speciation in dacitic melts using X-ray absorption near-edge structure spectroscopy of the S K-edge (S-XANES): Consideration of radiation-induced changes and the implications for sulfur in natural arc systems
- Ab initio calculations and crystal structure simulations for mixed layer compounds from the tetradymite series
- A fast open data reduction workflow for the electron microprobe flank method to determine Fe3+/ΣFe contents in minerals
- Machine learning applied to apatite compositions for determining mineralization potential
- Reconstructing volatile exsolution in a porphyry ore-forming magma chamber: Perspectives from apatite inclusions
- Incommensurate to normal phase transition in malayaite
- Raman spectroscopic measurements on San Carlos olivine up to 14 GPa and 800 K: Implications for thermodynamic properties
- Chemical and boron isotopic composition of tourmaline from the Yixingzhai gold deposit, North China Craton: Proxies for ore fluids evolution and mineral exploration
- Tourmaline chemical and boron isotopic constraints on the magmatic-hydrothermal transition and rare-metal mineralization in alkali granitic systems
- New Mineral Names