Linear Correlation of Ba and Eu Contents by Hydrothermal Activities: A Case Study in the Hetang Formation, South China

Figure 3

The occurrences of Ba-rich minerals. (a) Hyalophane grains in the vein matrix and a hydrothermal vein and cymrite in the matrix, sample WN-13. Both hyalophane and cymrite in the matrix occur as fillings of interparticle pores. Note that some hyalophane aggregates in veins are connected to those in the matrix. (b) Hyalophane in veins and in the matrix, sample WN-19. Nearly all the clastic K-feldspar grains are surrounded by hyalophane rims. Some hyalophane aggregates in veins are connected to hyalophane rims in the matrix. (c) Closeup of the marked area in (b), sample WN-19. Hyalophane rims can be easily distinguished from clastic K-feldspar cores by the difference in brightness. Hyalophane in veins and in the matrix is closely associated. (d) Hyalophane in veins and the matrix, sample WN-44. Hy: hyalophane; Cym: cymrite; Qz: quartz.

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