In the Early Silurian carbonaceous slates of the Serracin sycline there is a series of veins filled by strained fibrous quartz and low-K muscovite. Two types of veins have been distinguished: 1. -veins with antitaxial growth fibers and 2. - veins with sintaxial growth fibers. Fibers in these veins were formed by a "crack-seal" mechanism, produced by sucessive development of microfissures followed by periods of cementation.
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