Dual origin of ferropericlase inclusions within super-deep diamonds

Lorenzon, Sofia; Wenz, Michelle D.; Nimis, Paolo; Jacobsen, S. D.; Pasqualetto, Leonardo; Pamato, Martha G.; Novella, Davide; Zhang, Dongzhou; Anzolini, Chiara; Regier, Margo E.; Stachel, Thomas; Pearson, D.G.; Harris, Jeffrey W.; Nestola, Fabrizio

doi:10.1016/j.epsl.2023.118081

Cited by 10 publications

(8 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The analysis of crystallographic orientation relationships between natural ferropericlase inclusions and host diamonds confirmed these data. It demonstrated that Mg-rich ferropericlase grains were trapped by growing diamonds within the lower mantle, and Fe-rich ferropericlases are syngenetic with their host diamonds and form under redox growth in the upper mantle [37]. The low-Ni and high-Fe ferropericlases do not associate with former bridgmanite and former CaSi-perovskite ("davemaoite") but with Ca(Si,Ti)O 3 , magnesite, and merrillite.…”

Section: Discussionmentioning

confidence: 99%

Distinct Groups of Low- and High-Fe Ferropericlase Inclusions in Super-Deep Diamonds: An Example from the Juina Area, Brazil

Kaminsky,

Zedgenizov,

Sevastyanov

et al. 2023

Minerals

View full text Add to dashboard Cite

Diamonds from the Rio Sorriso placer in the Juina area, Mato Grosso State, Brazil, contain mineral inclusions of ferropericlase associated with MgSiO3, CaSiO3, magnesite, merrillite, and other minerals. The ferropericlase inclusions in Rio Sorriso diamonds are resolved into two distinct genetic and compositional groups: (1) protogenetic, high-Ni and low-Fe (Ni = 8270–10,660 ppm; mg# = 0.756–0.842) ferropericlases, and (2) syngenetic, low-Ni and high-Fe (Ni = 600–3050 ppm; mg# = 0.477–0.718) ferropericlases. Based on the crystallographic orientation relationships between natural ferropericlase inclusions and host diamonds, high-Ni and low-Fe ferropericlases originate in the upper part of the lower mantle, while low-Ni and high-Fe ferropericlases, most likely, originate in the lithosphere. Mineral inclusions form the ultramafic lower-mantle (MgSiO3, which we suggest as bridgmanite, CaSiO3, which we suggest as CaSi-perovskite, and high-Ni and low-Fe ferropericlase) and lithospheric (CaSiO3, which we suggest as breyite, Ca(Si,Ti)O3, and low-Ni and high-Fe ferropericlase) associations. The presence of magnesite and merrillite inclusions in association with ferropericlase confirmed the existence of a deep-seated carbonatitic association. Diamonds hosting high-Ni and low-Ni ferropericlase have different carbon-isotopic compositions (δ13C = −5.52 ± 0.75‰ versus −7.07 ± 1.23‰ VPDB, respectively). It implies the carbon-isotopic stratification of the mantle: in the lower mantle, the carbon-isotopic composition tends to become isotopically heavier (less depleted in 13C) than in lithospheric diamonds. These regularities may characterize deep-seated diamonds and ferropericlases not only in the Juina area of Brazil but also in other parts of the world.

show abstract

Section: Discussionmentioning

confidence: 99%

Distinct Groups of Low- and High-Fe Ferropericlase Inclusions in Super-Deep Diamonds: An Example from the Juina Area, Brazil

Kaminsky,

Zedgenizov,

Sevastyanov

et al. 2023

Minerals

View full text Add to dashboard Cite

show abstract

“…When specific CORs are individuated, inclusion is often considered syngenetic 3 , 5 – 7 , 19 , 27 : it is supposed that a mineral nucleates and grows on a diamond face with a specific crystallographic orientation and, subsequently, is embedded by the diamond itself. Unfortunately, this interpretation is almost certainly incorrect.…”

Section: Epitaxy and Epitaxial Criterionmentioning

confidence: 99%

“…To better explain this concept, let us consider periclase (Fper) inclusions in diamond (D), (Mg,Fe)O (Space Group, S.G.: F m m), with a specific COR defined by the coincidence of their main crystallographic axes, 24 , 27 . Such specific COR can be realized in several ways (Fig.…”

Section: Epitaxy and Epitaxial Criterionmentioning

confidence: 99%

“…In a more recent work, Lorenzon et al 27 determined the CORs for 57 Fper inclusions in 37 diamonds spanning a large compositional range to determine possible associations between the Fper Fe-content and the depth origins of periclase-bearing diamonds. To increase the statistical significance of their analysis, two Fper inclusions (X FeO ≈ 0.40) in a diamond previously studied by Anzolini et al 40 were also considered.…”

Section: Periclase Inclusions In Diamondmentioning

confidence: 99%

“…We will show here that also the third criterion (EC) cannot be considered as a reliable argument to demonstrate the syngenetic relationship between diamonds and their mineral inclusions. We will make use of recent experimental observations and some new considerations to correctly interpret the relative crystallographic orientations of mineral inclusions in diamond 2 , 4 , 6 , 10 , 13 – 15 , 17 – 27 . Especially, we will focus our attention on periclase [(Mg,Fe)O] and magnesiochromite (MgCr 2 O 4 ) inclusions, recently considered syngenetic by some researchers on the basis of the EC.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A critique of using epitaxial criterion to discriminate between protogenetic and syngenetic mineral inclusions in diamond

Bruno,

Ghignone,

Aquilano

et al. 2024

Sci Rep

Self Cite

View full text Add to dashboard Cite

Distinguishing syngenetic from protogenetic inclusions in natural diamonds is one of the most debated issues in diamond research. Were the minerals that now reside in inclusions in diamonds born before the diamond that hosts them (protogenesis)? Or did they grow simultaneously and by the same reaction (syngenesis)? Once previously published data on periclase [(Mg,Fe)O] and magnesiochromite (MgCr2O4) inclusions in diamond have been re-analysed, we show that the main arguments reported so far to support syngenesis between diamond and its mineral inclusions, definitely failed. Hence: (a) the epitaxial relationships between diamond and its mineral inclusion should no longer be used to support syngenesis, because only detecting an epitaxy does not tell us which was the nucleation substrate (there are evidences that in case of epitaxy, the inclusion acts as a nucleation substrate); (b) the morphology of the inclusion should no longer be used as well, as inclusions could be protogenetic regardless their shapes. Finally, we advance the hypothesis that the majority of inclusions in diamonds are protogenetic, e.g., they are constituent of rocks in which diamonds were formed and not products of reactions during diamond growth.

show abstract

Imperfections in natural diamond: the key to understanding diamond genesis and the mantle

Day,

Pamato,

Novella

et al. 2023

Riv. Nuovo Cim.

View full text Add to dashboard Cite

Diamond has unique physical, thermal, electrical, and optical properties with respect to other minerals and related synthetic compounds that make it extremely valuable from an economic and industrial perspective. Natural diamond that forms in the upper mantle, transition zone, and lower mantle may encapsulate mantle minerals during growth and protect them from physical breakdown and chemical alteration upon ascent of the diamond to the surface via kimberlite eruption. Such mineral inclusions serve as the only direct means to study the deep Earth and provide critical information about the pressure, temperature, and redox conditions and the chemical and isotopic composition of the mantle. Natural diamonds show a wide range of ages and thus allow one to reconstruct the history of large-scale Earth processes, such as the formation and amalgamation of Earth’s lithosphere, the onset and evolution of tectonic processes (e.g., Wilson cycles), and the recycling of C, H, and N between different primordial and crustal reservoirs. In this review, a detailed description of all types of imperfections (e.g., mineral and fluid inclusions and structural defects) and the methods by which such imperfections can be analyzed to elucidate aspects of Earth’s complex geologic history is given.

show abstract

Dual origin of ferropericlase inclusions within super-deep diamonds

Cited by 10 publications

References 35 publications

Distinct Groups of Low- and High-Fe Ferropericlase Inclusions in Super-Deep Diamonds: An Example from the Juina Area, Brazil

Distinct Groups of Low- and High-Fe Ferropericlase Inclusions in Super-Deep Diamonds: An Example from the Juina Area, Brazil

A critique of using epitaxial criterion to discriminate between protogenetic and syngenetic mineral inclusions in diamond

Imperfections in natural diamond: the key to understanding diamond genesis and the mantle

Contact Info

Product

Resources

About