The boron isotopic composition of tourmaline from tsavorite deposits in the Neoproterozoic Mozambique metamorphic belt, with a special focus on the mining districts in Kenya

Citation:
Nyamai C, Rollion C, Feneyrol J, Martelat J-E, Omito E, Daniel Ichang'i, Wamunyu A. "The boron isotopic composition of tourmaline from tsavorite deposits in the Neoproterozoic Mozambique metamorphic belt, with a special focus on the mining districts in Kenya.". In: 13th SGA Biennial Meeting. Nancy, France; 2015.

Date Presented:

August 2015

Abstract:

The dravitic tourmalines associated with different types of rock from the tsavorite-bearing
metasedimentary Neoproterozoic sequence in Kenya, Tanzania, and Madagascar show two
ranges of boron isotopic compositions:(1) Tourmalines associated with tsavorite nodules
have homogenous 8113 values of-19.8 1 1.2 'llm that clearly involve continental evaporitic
material;(2) Tourrnalines from unmineralized rocks (elastic metasediments, metapegmatite,
and marble) have 8118 values between 45.9 and 40.356 “, which reflect a magmatic source
for the elastic tourmaline and probably an evaporitic one for tourmaline in marble.

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