Geological characteristics and its genetic model of tanzanite deposit at Merelani,Tanzania
Through the field geological mapping,the geological setting and its mineralization characteristics for tanzanite deposit at Merelani area,Tanzania are described in details,especially the occurrences of orebodies and characteristics of gemstone are analyzed and reviewed,further its genetic model is discussed preliminarily.It is considered that tanzanite has been formed in the altered graphite gneiss which distributed in the Neoproterozoic Mo-zambique metamorphic belt at proximately 500 Ma when the Pan-African movement was taken place.Being a skarn deposit related to the contact metasomatism,the lithostratigraphic and tectonic deformation are two main controlling factors.
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