Fractionation of rare earth elements in silicate-sulfate magmatic-hydrothermal systems: Evidence from unique REE-Si-S-O phases

Description

This study investigates how rare earth element (REE) mobilization and precipitation occur under hydrothermal conditions, with a focus on their interaction with silicates and sulfates. The hypothesis is that specific mineralogical and experimental conditions influence the formation and composition of REE products. The dataset comprises four tables, provided as separate sheets in a single Excel file. Each table represents key experimental data and findings: Table S1: Detailed experimental setup and results for synthetic fluid inclusion experiments. Includes temperature, pressure, starting material compositions, and observed inclusions formed under controlled conditions. Table S2: Experimental details and results of hydrothermal reactions between silicates and REE sulfates. Lists reaction conditions (temperature, pressure, duration), silicates, REE sulfate types, and resulting mineralogical changes. Table S3: Average EPMA (Electron Probe Micro-Analysis) compositions of REE-bearing products in quartz (Q), K-feldspar (K), and diopside (D)-bearing hydrothermal experiments. Provides elemental compositions, calculated proportions of REE phases, and insights into preferential REE incorporation. Table S4: Raman spectroscopy peaks of representative REE products in quartz (Q)-, K-feldspar (K)-, and diopside (D)-bearing hydrothermal experiments, aiding in phase identification and structural analysis.

Steps to reproduce

Experimental Setup: Standardized preparation of starting materials and sealed capsules. Reaction Control: Strict temperature and pressure monitoring during experiments. Data Acquisition: Consistent analytical protocols for EPMA and Raman spectroscopy. Data Processing: Use of JEOL and LabSpec software for accurate data analysis.

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