Other
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993e%26psl.119...19s&link_type=abstract
Earth and Planetary Science Letters, Volume 119, Issue 1-2, p. 19-26.
Other
8
Scientific paper
Coarse graphite in association with cordierite and quartz within a vein in a metapelite locality at Chittikara (CHT) in southern India illustrates precipitation of graphite from CO2-rich fluids. Carbon isotope traverses within individual graphite crystals using a microsampling technique reveal strong isotopic zonations in graphite crystal from the vein, with δ13C values oscillating between -13‰ in the core and -8.5‰ in the rim. CO2 trapped within fluid inclusions in the cordierite shows δ13C = -5‰, suggesting isotopic equilbrium with the core composition of the graphite. A graphite crystal from the metapelite immediately adjacent to the vein is also zoned, with a smooth rimward increase in 13C. Disseminated graphite flakes in the host metapelites ca. 1 m from the vein are, however, unzoned, and possess strongly negative δ13C values (-34.4‰). The rimward increase in 13C, the absence of other carbon-bearing phases and the sluggish exchange rates for carbon in graphites preclude diffusive re-equilibration, and suggest that the different zoning patterns in the coarse graphite flakes within and adjacent to the vein assemblage at CHT have resulted from precipitation in different parts of a highly channelled fluid regime, where fluids are non-wetting and move episodically by a hydraulic fracture mechanism. Our study provides the first unambiguous insight into graphite precipitation mechanisms, and has potential implications for the nature of fluid interconnectivity and CO2 transport and equilibration length scales within the crust.
Santosh Mogurampelly
Wada Hideki
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