| Petrographic, mineral chemical and whole rock geochemical data of hypabyssal kimberlite from the Finlay, Muskox, Rich and Jean bodies were acquired for a comparative study of hypabyssal kimberlite across the Slave craton.; Petrographic examination revealed the samples from the Finlay body to be representative of a single intrusive phase, which can be classified as a uniform textured, macrocrystic, phlogopite-rich, calcite monticellite serpentine hypabyssal kimberlite. The Muskox samples are representative of two intrusive phases; one is a uniform textured, macrocrystic, spinel-rich, monticellite serpentine calcite hypabyssal kimberlite, and the other is a uniform textured, macrocrystic, spinel-rich, serpentine hypabyssal kimberlite breccia. The Rich samples are representative of two intrusive phases; a uniform textured, macrocrystic, spinel-rich carbonatized hypabyssal kimberlite breccia, and a flow-banded, aphanitic, spinel-rich carbonatized hypabyssal kimberlite. The samples from the Jean body are representative of at least four intrusive phases: a uniform textured, macrocrystic, serpentinized spinel-rich hypabyssal kimberlite microbreccia; a uniform textured, sparsely macrocrystic, serpentinized opaque oxide-rich hypabyssal kimberlite microbreccia; a flow-banded, macrocrystic spinel-rich carbonatized and serpentinized hypabyssal kimberlite microbreccia; and a sparsely macrocrystic, spinel-rich serpentinized hypabyssal kimberlite breccia. (Abstract shortened by UMI.)... |
