REE geochemistry of the weathered crust of acid volcanic rocks—An experimental study |
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| Authors: | Song Yunhua Shen Lipu |
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| Institution: | (1) Institute of Geochemistry, Academia Sinica, China |
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| Abstract: | Experimental data show that the Ce-family REE are more accessible to hydrolysis than the Y-family REE, and the optimum pH
conditions for REE adsorption vary from one system to another, for example, pH = 3–6 for the chloride system, and 3–4 for
the acutate system. At pH = 3–6, no obvious selective REE adsorption is observed in both the systems. From the deep levels
of the weathered crust towards the surface the percent content of the Ce-family REE tends to increase progressively, whereas
that of the Y-family REE tends to decrease, with La/Ce varying from <1 → > 1 → <1. More or less fractionation would take place
among the rare-earth elements due to their different geochemical behaviors. Nevertheless, the REE distribution patterns in
the weathered crust can still reflect the REE distribution patterns in the parent rocks. Relatively unstable independent REE
minerals, such as bastinaesite, parisite and britholite are considered as the main source of rare-earth elements in the weathered
crust of this area. |
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