Search criteria and signs for asbestos deposits
Abstract
The search for chrysotile asbestos deposits is facilitated by the constant confinement of deposits to certain rocks - to serpentinites. These rocks arise mainly by metamorphosis of ultramafic intrusive rocks and occasionally - by metamorphosis of dolomitized limestones, in both cases as a result of hydrothermal processes. Naturally, the search criteria and features for chrysotile asbestos deposits associated with serpentinized ultramafic rocks will be different than for deposits associated with serpentinized limestones. The most favorable parent rocks for industrially valuable anthophyllite-asbestos deposits are large- and coarse-grained pyroxenites, forming xenoliths within younger granite intrusions, especially those areas of pyroxenites that are cut by dikes of vein derivatives of granite magma.
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