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Textural and isotopic variations in graphite from plutonic rocks, South-Central New Hampshire

Textural and isotopic variations in graphite from plutonic rocks, South-Central New Hampshire,10.1007/BF00371711,Contributions To Mineralogy and Petro

Textural and isotopic variations in graphite from plutonic rocks, South-Central New Hampshire   (Citations: 15)
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Graphite occurs in two distinct textural varieties in syntectonic granitoids of the New Hampshire Plutonic Series and in associated metasedimentary wall rocks. Textural characteristics indicate that coarse graphite flakes were present at an early stage of crystallization of the igneous rocks and thus may represent xenocrystic material assimilated from the wall rocks. The range of d13C values determined for flake graphite in the igneous rocks (-26.5 to -13.8‰) overlaps the range for flake graphite in the wall rocks (-26.0 to -16.7‰), and spatial correlation of some d13C values in the plutons and wall rocks supports the assimilation mechanism. The textures of fine-grained irregular aggregates or spherulites of graphite, on the other hand, indicate that they formed along with secondary hydrous silicates and carbonates during retrograde reactions between the primary silicates and a carbon-bearing aqueous fluid phase. Relative to coexisting flake graphite, spherulitic graphite shows isotopic shifts ranging from 1.9‰ higher to 1.4‰ lower in both igneous and metasedimentary samples.
Journal: Contributions To Mineralogy and Petrology - CONTRIB MINERAL PETROL , vol. 93, no. 4, pp. 409-419, 1986
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