CMBBZCentral Metasedimentary Belt Boundary Zone (geology)
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However, we have also found zeolites in various granitic pegmatites, nepheline syenitic pegmatites, fractured diabase dikes, calc-silicate gneisses and fenites in the same area, and in agpaitic rocks and calc-silicate skarns in the CMBBZ.
The CMBBZ is characterized by brecciated carbonate metasediments, and is host to intrusions of nepheline syenite along its length.
Natrolite is frequently encountered in the nepheline-bearing metasediments, pegmatitic segregations in nepheline gneiss and nepheline syenite deposits that parallel the CMBBZ.