On the endemicity of green microdiamonds of the Pobuzhzhya-Prydnistrovya region
DOI:
https://doi.org/10.15407/dopovidi2016.01.057Keywords:
green microdiamonds, isotopic composition of carbon, nitrogen impurities, Pobuzhzhya–Prydnistrovya region, rounded tetrahexahedron, Ukrainian ShieldAbstract
In the 1950–1970, the diamond-bearing uneven terrigenous sediments in the Pobuzhzhya–Prydnistrovya region were discovered. Among the found diamonds, the specific rounded green microdiamonds–tetrahexahedrons were discovered. Such diamond crystals are extremely rare, even in the known deposits of this mineral in the world. They are distributed only in the south-western part of the territory of Ukraine and therefore referred to the diamond-endemic. We obtain new data on the mineralogy of green microdiamonds of the Pobuzhzhya–Prydnistrovya region that confirm their endemicity and point to their local indigenous sources. These microdiamonds are characterized by a high content of nitrogen impurities, low degree of aggregation of nitrogen atoms, and narrow range of values of the isotopic composition of carbon. The distribution of green microdiamonds is analyzed, and their genesis and the possible finding of their root sources are suggested.
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