ヒマラヤのロイコ花崗岩におけるマグマ-熱水流体-融体相互作用による鉄同位体分化

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Updated: Jan 31, 2026

Quantitating Iron Transport Across the Mouse Placenta In Vivo Using Nonradioactive Iron Isotopes

Quantitating Iron Transport Across the Mouse Placenta In Vivo Using Nonradioactive Iron Isotopes

Published on: May 10, 2022

Yikang Quan¹, Xia Hu¹, Dingsheng Jiang¹

¹State Key Laboratory of Lithospheric and Environmental Coevolution, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China.

Fundamental research

|January 30, 2026

Abstract:

Iron (Fe) isotopes have been used to trace magmatic evolution (e.g., mineral fractional crystallization, partial melting degree, and fluid exsolution), but the behavior of Fe isotopes in magmatic-hydrothermal processes remains poorly constrained. Here we report Fe isotope compositions of the Kampa leucogranites from the Himalayan orogenic belt to understand the fluid-melt interaction and rare metal enrichment in highly-evolved granites. The Nb/Ta ratio divides samples into two groups: group 1 with high Nb/Ta ratios while group 2 with low Nb/Ta ratios. The δ⁵⁶Fe of group 1 leucogranites range from 0.14‰ to 0.23‰, isotopically heavier than the average upper continental crust value, indicative of the residues from fractional crystallization. On the contrary, the group 2 leucogranites exhibit large range of δ⁵⁶Fe from -0.21‰ to 0.21‰. The correlations between fluid-mobile/fluid-immobile element ratios, and iron isotope, and tetrad effect were attributed to the effect of magmatic-hydrothermal fluid-melt interaction during magma evolution. A fluid-melt interaction model with an initial δ⁵⁶Fe of -0.4‰ for the fluid and a fractionation factor Δ⁵⁶Fe_fluid-melt of -0.35‰ successfully explains the observed Fe isotope data. It is likely that these magmatic-hydrothermal fluids are derived from exsolution from the underlying magma reservoirs in the middle crust, which can modify the Fe isotope compositions and bring abundant rare metal elements into the leucogranites. Therefore, Fe isotope data can reveal the properties of magmatic-hydrothermal fluids and serve as an indicator for ore-forming processes.

キーワード:

ヒマラヤ鉄同位体ロイコ花崗岩マグマ-熱水流体レアメタル鉱化作用

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Simulation of Early Earth Hydrothermal Chimneys in a Thermal Gradient Environment

Simulation of Early Earth Hydrothermal Chimneys in a Thermal Gradient Environment

Published on: February 27, 2021

Chemical Gardens as Flow-through Reactors Simulating Natural Hydrothermal Systems

Chemical Gardens as Flow-through Reactors Simulating Natural Hydrothermal Systems

Published on: November 18, 2015

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