Publications

@article{gonzalez_elastic_2025,

title = {Elastic thermobarometry of natural and experimental quartz inclusions in garnet (QuiG) under tension},

author = {Joseph P. Gonzalez and Mattia L. Mazzucchelli and Jay B. Thomas and Ross J. Angel and Robert S. Darling and Khi X. Atchinson and Mattia Gilio and Matteo Alvaro},

url = {https://doi.org/10.1007/s00410-025-02252-2},

doi = {10.1007/s00410-025-02252-2},

issn = {1432-0967},

year  = {2025},

date = {2025-09-01},

urldate = {2025-09-01},

journal = {Contributions to Mineralogy and Petrology},

volume = {180},

number = {10},

pages = {70},

abstract = {Elastic thermobarometry has been rarely applied to quartz inclusions entrapped in garnet (QuiG) in granulite and igneous terranes, in part, because there is uncertainty about the reliability of the thermobarometric results arising from the quartz inclusions being subject to tensile strain and stress when examined at room conditions. Here, we present QuiG results from high-temperature metapelites from the Adirondacks, NY, USA and piston-cylinder experiments that give insight into the deformation behavior of quartz inclusions under tension. Measured remnant pressures (Pinc) of experimental and natural samples calculated using the quartz phonon mode Grüneisen tensor are too tensile with respect to the expected Pinc values based on experimental and petrologic constraints. We show that these discrepancies are not related to non-elastic deformation nor inaccuracies in the quartz equation of state. Evaluation of previous density functional theory (DFT) results shows that the structural response of quartz is non-linear with increasing tensile strain. Therefore, because the available quartz phonon mode Grüneisen tensor was determined with a linear fit optimized for compressive strains, obtained tensile strains using this tensor are too large in magnitude. Pinc values obtained using the hydrostatic calibrations of the 128 and 464 cm−1 peaks have better agreement with the expected values and return entrapment conditions that are consistent with petrologically constrained or known experimental pressures. Pinc values obtained through hydrostatic calibrations must nonetheless be treated with caution because the behavior of Raman phonon modes under tension has not been calibrated experimentally.},

keywords = {Elastic thermobarometry, Elasticity, Garnet, Quartz, QuiG, Raman thermobarometry},

pubstate = {published},

tppubtype = {article}

}

@article{angel_garnet_2022,

title = {Garnet EoS: a critical review and synthesis},

author = {Ross J. Angel and Mattia Gilio and Mattia Mazzucchelli and Matteo Alvaro},

url = {https://doi.org/10.1007/s00410-022-01918-5},

doi = {10.1007/s00410-022-01918-5},

issn = {1432-0967},

year  = {2022},

date = {2022-05-01},

urldate = {2022-05-01},

journal = {Contributions to Mineralogy and Petrology},

volume = {177},

number = {5},

pages = {54},

abstract = {All available volume and elasticity data for the garnet end-members grossular, pyrope, almandine and spessartine have been re-evaluated for both internal consistency and for consistency with experimentally measured heat capacities. The consistent data were then used to determine the parameters of third-order Birch–Murnaghan EoS to describe the isothermal compression at 298 K and a Mie–Grüneisen–Debye thermal-pressure EoS to describe the PVT behaviour. In a full Mie–Grüneisen–Debye EoS, the variation of the thermal Grüneisen parameter with volume is defined as $$textbackslashgamma = textbackslashgamma _0textbackslashleft(textbackslashfracVV_0textbackslashright)textasciicircumq$$. For grossular and pyrope garnets, there is sufficient data to refine q which has a value of q = 0.8(2) for both garnets. For other garnets, the data do not constrain the value of q and we therefore refined a q-compromise version of the Mie–Grüneisen–Debye EoS in which both γ/V and the Debye temperature θ D are held constant at all P and T, leading to $$textbackslashleft( textbackslashraise0.7extextbackslashhbox$textbackslashpartial C_textbackslashtextV $ textbackslash!textbackslashmathordtextbackslashleft/ textbackslashvphantom textbackslashpartial C_textbackslashtextV  textbackslashpartial Ptextbackslashright.textbackslashkern-textbackslashnulldelimiterspace textbackslash!textbackslashlower0.7extextbackslashhbox$textbackslashpartial P$ textbackslashright)_textbackslashtextT = 0$$, parallel isochors and constant isothermal bulk modulus along an isochor. Final refined parameters for the q-compromise Mie–Grüneisen–Debye EoS are: PyropeAlmandineSpessartineGrossularV0 (cm3/mol)a113.13115.25117.92125.35K0T (GPa)169.3 (3)174.6 (4)177.57 (6)167.0 (2)$$Ktextasciicircumtextbackslashprime_0textbackslashtextT$$4.55 (5)5.41 (13)4.6 (3)5.07 (8)θ D0771 (28)862 (22)860 (35)750 (13)γ01.185 (12)1.16 (fixed)1.18 (3)1.156 (6)for pyrope and grossular, the two versions of the Mie–Grüneisen–Debye EoS predict indistinguishable properties over the metamorphic pressure and temperature range, and the same properties as the EoS based on experimental heat capacities. The biggest change from previously published EoS is for almandine for which the new EoS predicts geologically reasonable entrapment conditions for zircon inclusions in almandine-rich garnets.},

keywords = {Crystallography, Elastic thermobarometry, Elasticity, Garnet, Single-crystal X-ray diffraction, thermodynamics},

pubstate = {published},

tppubtype = {article}

}

@article{campomenosi_using_2021,

title = {Using the elastic properties of zircon-garnet host-inclusion pairs for thermobarometry of the ultrahigh-pressure Dora-Maira whiteschists: problems and perspectives},

author = {Nicola Campomenosi and Marco Scambelluri and Ross J. Angel and Joerg Hermann and Mattia L. Mazzucchelli and Boriana Mihailova and Francesca Piccoli and Matteo Alvaro},

url = {https://doi.org/10.1007/s00410-021-01793-6},

doi = {10.1007/s00410-021-01793-6},

issn = {1432-0967},

year  = {2021},

date = {2021-04-01},

urldate = {2021-04-01},

journal = {Contributions to Mineralogy and Petrology},

volume = {176},

number = {5},

pages = {36},

abstract = {The ultrahigh-pressure (UHP) whiteschists of the Brossasco-Isasca unit (Dora-Maira Massif, Western Alps) provide a natural laboratory in which to compare results from classical pressure (P)–temperature (T) determinations through thermodynamic modelling with the emerging field of elastic thermobarometry. Phase equilibria and chemical composition of three garnet megablasts coupled with Zr-in-rutile thermometry of inclusions constrain garnet growth within a narrow P–T range at 3–3.5 GPa and 675–720 °C. On the other hand, the zircon-in-garnet host-inclusion system combined with Zr-in-rutile thermometry would suggest inclusion entrapment conditions below 1.5 GPa and 650 °C that are inconsistent with the thermodynamic modelling and the occurrence of coesite as inclusion in the garnet rims. The observed distribution of inclusion pressures cannot be explained by either zircon metamictization, or by the presence of fluids in the inclusions. Comparison of the measured inclusion strains with numerical simulations shows that post-entrapment plastic relaxation of garnet from metamorphic peak conditions down to 0.5 GPa and 600–650 °C, on the retrograde path, best explains the measured inclusion pressures and their disagreement with the results of phase equilibria modelling. This study suggests that the zircon-garnet couple is more reliable at relatively low temperatures (textless 600 °C), where entrapment conditions are well preserved but chemical equilibration might be sluggish. On the other hand, thermodynamic modelling appears to be better suited for higher temperatures where rock-scale equilibrium can be achieved more easily but the local plasticity of the host-inclusion system might prevent the preservation of the signal of peak metamorphic conditions in the stress state of inclusions. Currently, we cannot define a precise threshold temperature for resetting of inclusion pressures. However, the application of both chemical and elastic thermobarometry allows a more detailed interpretation of metamorphic P–T paths.},

keywords = {Elastic thermobarometry, Garnet, metamorphic rocks, petrology, Raman spectroscopy, Raman thermobarometry, Zircon},

pubstate = {published},

tppubtype = {article}

}

@article{Milani2015,

title = {Diamond–garnet geobarometry: The role of garnet compressibility and expansivity},

author = {Sula Milani and Fabrizio Nestola and Matteo Alvaro and Daria Pasqual and Mattia Luca Mazzucchelli and M C Domeneghetti and C A Geiger},

url = {http://www.sciencedirect.com/science/article/pii/S0024493715001097},

doi = {10.1016/j.lithos.2015.03.017},

year  = {2015},

date = {2015-01-01},

urldate = {2015-01-01},

journal = {Lithos},

volume = {227},

number = {0},

pages = {140--147},

keywords = {Crystallography, Diamond, Elastic thermobarometry, equations of state, Experiments, Garnet, petrology, Raman thermobarometry, Single-crystal X-ray diffraction, thermal expansion, thermodynamics},

pubstate = {published},

tppubtype = {article}

}