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- W2908203996 abstract "Diamonds, and the mineral inclusions they trap during growth, are pristine samples from the mantle that reveal processes in the deep Earth, provided the depth of formation of an inclusion-diamond pair being known. The majority of diamonds are lithospheric, while the depth of origin of super-deep diamonds (SDDs), which represent only 6% of the total, is uncertain. SDDs are considered to be sub-lithospheric, with formation from 300 to 800 km depth, on the basis of the inclusions trapped within them, which are believed to be the products of retrograde transformation from lower-mantle or transition-zone precursors.This Ph.D. project aims to obtain the real depth of formation of SDDs by studying the most common mineral phases enclosed within them by non-destructive methods. We have studied about 40 diamonds with such inclusion phases as CaSiO3-walstromite or ferropericlase using in-house single-crystal X-ray diffraction and micro-Raman spectroscopy as well as field emission gun-scanning electron microscopy, synchrotron X-ray tomographic microscopy and synchrotron Mossbauer source at outside Institutions. In addition, laser-heating diamond-anvil cell experiments were performed on a synthetic Ti-free jeffbenite to determine if the absence of Ti extends the stability field of such mineral compared to previous studies. Finally, elastic geobarometry has been completed both on ferropericlase and CaSiO3- walstromite, in this last case together with thermodynamic and first-principles calculations.One of our principal results suggests that CaSiO3-walstromite may be considered a sub-lithospheric mineral, but retrograde transformation from a CaSiO3-perovskite precursor is only possible if the diamond around the inclusion expands in volume by ~30%. Moreover, high-pressure and high-temperature experiments indicate that Ti-free jeffbenite could be directly incorporated into diamond in the transition zone or uppermost lower mantle and therefore this mineral may represent a high-pressure marker to detect SDDs. Finally, the observation of magnesioferrite exsolutions within ferropericlase, combined with elastic geobarometry results, strengthen the hypothesis that single ferropericlase inclusions might not be reliable markers for a diamond lower-mantle provenance." @default.
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- W2908203996 date "2019-03-19" @default.
- W2908203996 modified "2023-09-24" @default.
- W2908203996 title "Depth of formation of super-deep diamonds" @default.
- W2908203996 doi "https://doi.org/10.29173/ikc3913" @default.
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