A simple model for the pressure preservation index of inclusions in diamond
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L.M. Barron
Abstract
The isovolume locus for a diamond-mineral inclusion pair occurs where the relative volumes of the two minerals respond identically to changes in pressure-temperature (P-T) conditions. Thirty potential inclusion minerals have been assessed with a simple linear model of this system. The remnant pressure on the inclusion (diamond at the Earth’s surface) can be estimated by extrapolating the conditions of diamond formation to 0 °C using the slope of the isovolume locus. Remnant pressures can be positive (isovolume locus lower than formation pressure) or negative (locus higher than formation pressure), the latter indicating the inclusion has decompressed completely. When placed in order of increasing isovolume slope, this mineral list defines a pressure preservation index (PPI). Published work confirms that the model is quantitative up to diamond formation pressures of 50 Kb and qualitative beyond. Ten minerals are identified as key PPI indicators-in decreasing order of PPI they are: sanidine, coesite, dolomite, (sphene, garnet, diopside, zircon), magnesiowüstite, spinel, Mg0.9Fe0.1SiO3 perovskite. For most diamond formation conditions, inclusions of the first three minerals will retain high remnant pressures, whereas the last three will decompress completely. The central four minerals in brackets will have a highly variable response because their isovolume loci pass through diamond formation conditions. Preliminary calculations suggest that fluid inclusions (H2O, CO2) fall at or near the top of the list.
For inclusion-bearing diamonds at the Earth’s surface, the model predicts: (1) remnant pressures; (2) confining pressure on inclusion during delivery; (3) the stability of high-pressure polymorphs; (4) retention vs. resetting of radiometric ages; (5) those minerals suited for determining the conditions of formation based on measured remnant pressure; (6) those minerals capable of stabilizing a microdiamond inclusion; and (7) that supercritical fluids preserve inclusions of microdiamond in most minerals.
© 2015 by Walter de Gruyter Berlin/Boston
Articles in the same Issue
- Structural systematics of hydrous ringwoodite and water in earth’s interior
- Compressibility of phase Egg AlSiO3OH: Equation of state and role of water at high pressure
- Synchrotron infrared spectroscopy of OH-chondrodite and OH-clinohumite at high pressure
- Structural deformation mechanisms of zeolites under pressure
- Variation of hydrogen bonded O···O distances in goethite at high pressure
- Pressure-controlled polytypism in hydrous layered materials
- OH– in synthetic and natural coesite
- Pressure-induced phase transformation of kalicinite (KHCO3) at 2.8 GPa and local structural changes around hydrogen atoms
- Potential docking sites and positions of hydrogen in high-pressure silicates
- Contrasting bonding behavior of two hydroxyl-bearing metamorphic minerals under pressure: Clinozoisite and topaz
- Experimental investigation of crystallization kinetics in a haplogranite system
- Assessment of cation substitutions along the gallium and fluorine analogue of the tremolite-glaucophane join
- Experimental hydrothermal alteration of partially metamict zircon
- On the origin of size-dependent and size-independent crystal growth: Influence of advection and diffusion
- Ordering in spinels—A Monte Carlo study
- Single-crystal in situ high-temperature structural investigation of the I1̅ –I2/c phase transition in Ca0.2Sr0.8Al2Si2O8 feldspar
- New clinopyroxene-liquid thermobarometers for mafic, evolved, and volatile-bearing lava compositions, with applications to lavas from Tibet and the Snake River Plain, Idaho
- Fe and Ni impurities in synthetic diamond
- Phase transformations and reaction kinetics during the temperature-induced oxidation of natural olivine
- Thermal infrared spectroscopy and modeling of experimentally shocked plagioclase feldspars
- Oxygen isotopic composition of nano-scale uraninite at the Oklo-Okélobondo natural fission reactors, Gabon
- Clinopyroxenite from the Sulu ultrahigh-pressure terrane, eastern China: Origin and evolution of garnet exsolution in clinopyroxene
- Letters. An assessment of nuclear microprobe analyses of B in silicate minerals
- Incommensurate phase in the kosmochlor-diopside join: A new polymorph of clinopyroxene
- Elastic properties of hydrous ringwoodite
- Thermochemistry of guest-free melanophlogite
- A simple model for the pressure preservation index of inclusions in diamond
Articles in the same Issue
- Structural systematics of hydrous ringwoodite and water in earth’s interior
- Compressibility of phase Egg AlSiO3OH: Equation of state and role of water at high pressure
- Synchrotron infrared spectroscopy of OH-chondrodite and OH-clinohumite at high pressure
- Structural deformation mechanisms of zeolites under pressure
- Variation of hydrogen bonded O···O distances in goethite at high pressure
- Pressure-controlled polytypism in hydrous layered materials
- OH– in synthetic and natural coesite
- Pressure-induced phase transformation of kalicinite (KHCO3) at 2.8 GPa and local structural changes around hydrogen atoms
- Potential docking sites and positions of hydrogen in high-pressure silicates
- Contrasting bonding behavior of two hydroxyl-bearing metamorphic minerals under pressure: Clinozoisite and topaz
- Experimental investigation of crystallization kinetics in a haplogranite system
- Assessment of cation substitutions along the gallium and fluorine analogue of the tremolite-glaucophane join
- Experimental hydrothermal alteration of partially metamict zircon
- On the origin of size-dependent and size-independent crystal growth: Influence of advection and diffusion
- Ordering in spinels—A Monte Carlo study
- Single-crystal in situ high-temperature structural investigation of the I1̅ –I2/c phase transition in Ca0.2Sr0.8Al2Si2O8 feldspar
- New clinopyroxene-liquid thermobarometers for mafic, evolved, and volatile-bearing lava compositions, with applications to lavas from Tibet and the Snake River Plain, Idaho
- Fe and Ni impurities in synthetic diamond
- Phase transformations and reaction kinetics during the temperature-induced oxidation of natural olivine
- Thermal infrared spectroscopy and modeling of experimentally shocked plagioclase feldspars
- Oxygen isotopic composition of nano-scale uraninite at the Oklo-Okélobondo natural fission reactors, Gabon
- Clinopyroxenite from the Sulu ultrahigh-pressure terrane, eastern China: Origin and evolution of garnet exsolution in clinopyroxene
- Letters. An assessment of nuclear microprobe analyses of B in silicate minerals
- Incommensurate phase in the kosmochlor-diopside join: A new polymorph of clinopyroxene
- Elastic properties of hydrous ringwoodite
- Thermochemistry of guest-free melanophlogite
- A simple model for the pressure preservation index of inclusions in diamond
