Work

Magmatic and hydrothermal evolution of the Weilasituo Sn polymetallic deposit recorded by the Li and O isotope compositions of zinnwaldite

Year: 2025

Type: article

Abstract: Lithium and O isotopic compositions of zinnwaldite from magmatic (cassiterite), magmatic-hydrothermal transition (UST) and hydrothermal (tin‑tungsten, molybdenum and copper‑zinc) stages of the Weilasituo Sn polymetallic deposit and fluid inclusions in quartz are used to trace the magmatic-hydrothermal evolution. Fluid inclusion microthermometry and laser Raman analysis indicate that the H 2 O-NaCl-CO 2 -CH 4 fluids associated with the Weilasituo deposit have high to medium-high temperatures and moderate salinities . The δ 7 Li values of magmatic zinnwaldite decrease with magmatic differentiation , which cannot be explained by fractional crystallization alone and, therefore, reflect late-stage fluid exsolution . Lithium and O isotope fractionation during fluid evolution depends not only on the temperature, but also on fluid-rock reactions that affect the Li and O isotopic compositions of the fluids from the hydrothermal tin‑tungsten stage and liquid-vapor phase separations that decrease δ 7 Li and increase δ 18 O of the fluids from the copper‑zinc stage.

Source: Journal of Geochemical Exploration

DOI: 10.1016/j.gexplo.2025.107790

Authors: Ruizhe Shi, Junxing Zhao, Rolf L. Romer, Zhenzhen Li, KEZHANG QIN, Shihong Tian

Institutions: Institute of Disaster Prevention, East China University of Technology

Language: English

Topic: Geochemistry and Geochronology of Asian Mineral Deposits

Subfield: Economics and Econometrics

Field: Economics, Econometrics and Finance

Domain: Social Sciences

Open Access status: hybrid

Estimated APC paid: $3,570

Funders: National Natural Science Foundation of China, China Scholarship Council, National Key Research and Development Program of China