Crust-derived potassic fluid in metamorphic microdiamond

Details Crust-derived potassic fluid in metamorphic microdiamond Crust-derived potassic fluid in metamorphic microdiamond

Mar 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005e%26psl.231..295h&link_type=abstract

Earth and Planetary Science Letters, Volume 231, Issue 3-4, p. 295-306.

Physics

6

Scientific paper

A highly potassic COH fluid, with dissolved phosphate, chloride and sulfate/sulfide, was identified as nanometer-size inclusions in metamorphic microdiamonds of Kokchetav dolomite marble and garnet quartz pyroxene rock using an analytical electron microscope (AEM) coupled with an energy-dispersive X-ray (EDX) spectrometer. This provides a direct piece of evidence for the formation of metamorphic microdiamonds from such a fluid. Although this crust-derived potassic fluid and the associated solid precipitates are in some respects similar to the fluid inclusions in fibrous/cloudy mantle diamonds, distinct chemical differences exist. This potassic COH fluid, in addition, has the potential to trigger high to ultrahigh-K magmatic and K metasomatic processes in mantle.

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