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Origin of a carbonate-rich breccia at Lake Minogami, Shawinigan area, Grenville Province, Quebec
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The Lake Minogami carbonate breccia (LMCB) exhibits field characteristics similar to those of a carbonatite diatreme, but a geochemical signature reflecting derivation from nearby marbles. The rocks display a very fine grained calcite matrix containing
mechanically abraded rounded rock fragments. The breccia shows mineralogy and geochemistry distinct from carbonatites, namely a high SiO2 content (÷30%), low abundances of compatible and incompatible trace elements and limited REE fractionation. In addition, breccia samples show REE normalized
patterns parallel to those of nearby tectonic marble and comparable 13C and 18O values. These features provide strong evidence for the derivation of the Lake Minogami carbonate breccia matrix by remobilization of a marble protolith. The presence of microfractures filled by calcite in both rock
fragments and xenocrysts, rare subgrains and neoblasts around xenocrysts, as well as bent twins and kinks in matrix calcite provide additional support for a tectonic origin.
Title: Origin of a carbonate-rich breccia at Lake Minogami, Shawinigan area, Grenville Province, Quebec
Description:
The Lake Minogami carbonate breccia (LMCB) exhibits field characteristics similar to those of a carbonatite diatreme, but a geochemical signature reflecting derivation from nearby marbles.
The rocks display a very fine grained calcite matrix containing
mechanically abraded rounded rock fragments.
The breccia shows mineralogy and geochemistry distinct from carbonatites, namely a high SiO2 content (÷30%), low abundances of compatible and incompatible trace elements and limited REE fractionation.
In addition, breccia samples show REE normalized
patterns parallel to those of nearby tectonic marble and comparable 13C and 18O values.
These features provide strong evidence for the derivation of the Lake Minogami carbonate breccia matrix by remobilization of a marble protolith.
The presence of microfractures filled by calcite in both rock
fragments and xenocrysts, rare subgrains and neoblasts around xenocrysts, as well as bent twins and kinks in matrix calcite provide additional support for a tectonic origin.
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