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Experimental study of apatite-fluid interaction and partitioning of rare earth elements at 150 and 250 °C by J. Caleb Chappell; Alexander P. Gysi; Thomas Monecke; Zhaoshan Chang is a Earth and Planetary Sciences article available to read on EtoBox.

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## Abstract Apatite is a common accessory phase in igneous and metamorphic rocks. Its stability in magmatichydrothermal and hydrothermal systems is known to be a key control on the mobility of rare earth elements (REE). To better constrain how apatite is altered during fluid-rock interaction at comparably low temperatures, batch-type apatite dissolution experiments were conducted at 150 and 250 °C at saturated water vapor pressure in acidic to mildly acidic (pH of 2–4) aqueous fluids having variable salinities (0, 0.5, and 5 wt% NaCl). The study reveals the dominance of apatite dissolution textures with the formation of micrometer-scale etch pits and dissolution channels developing prominently along the c-axis of the apatite crystals. Backscattered electron imaging shows an increase in apatite dissolution with increasing temperature and upon reacting the crystals with more acidic and higher salinity starting fluids. This study also demonstrates an increase in dissolved REE in the experimental fluids corroborating with the observed apatite dissolution behavior. Backscattered electron imaging of secondary minerals formed during apatite dissolution and scanning electron microscopy-bas

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Author

J. Caleb Chappell; Alexander P. Gysi; Thomas Monecke; Zhaoshan Chang

Publisher

Mineralogical Society of America

Published

2023

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)