HRTEM/AEM and SEM study of fluid-rock interactions [electronic resource] : Interaction of copper, silver, selenium, chromium, and cadmium-bearing solutions with geological materials at near surface conditions, with an emphasis on phyllosilicates

Published:: Washington, D.C. : United States. Dept. of Energy, 1992.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:: Pages: (61 pages) : digital, PDF file
Additional Creators:: Johns Hopkins University, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

Biotite has been reacted with acidic solutions, at 25'' +/-3''C, bearing silver (Ag₂SO₄), selenium (selenite), chromium (hexavalent Cr), and copper (CuSO₄). The experiments were open to the atmosphere. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) show that biotite sorbs and reduces Ag+(aq) to metallic silver. Polygonal precipitates and inclusions of metallic silver (with diameters ranging from 10's of angstroms to > ≥ μm) are concentrated on the edges of the biotite flakes and also in the interlayer region. X-ray photoelectron spectroscopy (XPS) of biotites reacted with selenite-bearing solutions show that the oxidation state of selenium sorbed on the surface of biotite is Se{sup 4+}. XPS of biotites reacted with Cr{sup 6+}-bearing solutions show that the oxidation state of chromium sorbed on the surface of biotite is Cr{sup 3+}. Copper-bearing solutions were reacted with low-F biotite in contrast to our previous work with high-F biotite (Olden et al., in press). Results indicate that low-F biotite absorbs more readily and extensively than high-F biotite. Further work on copper-enriched biotite from the chrysocolla zone has revealed that the mode of copper incorporation in biotite is more complex than previously described.

Report Numbers:

E 1.99:doe/er/14074-4
doe/er/14074-4

Subject(s):

Geothermal Energy

Other Subject(s):

Note:

Published through SciTech Connect.
05/01/1992.
"doe/er/14074-4"
"DE92040456"
Veblen, D.R.; Ilton, E.S.

Funding Information:

FG02-89ER14074

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