Infrared spectroscopy study of nitrogen centers in microdiamonds from Ukrainian Neogene placers

Nyerereite and nahcolite have been identified as micro- and nano-inclusions in diamond from the Juina area, Brazil. Alongside them are Sr- and Ba-bearing calcite minerals from the periclase-wiistite series, wollastonite II (high), Ca-rich garnet, spinels, olivine, phlogopite and apatite. Minerals of the periclase- wustite series belong to two separate groups: wustite and Mg-wustite with Mg# = 1.9—15.3, and Fe- periclase and periclase with Mg# = 84.9—92.1. Wollastonite-II (high, with Ca:Si = 0.992) has a triclinic structure. Two types of spinel were distinguished among mineral inclusions in diamond: zoned magnesioferrite (with Mg# varying from 13.5—90.8, core to rim) and Fe spinel (magnetite). Olivine (Mg# = 93.6), intergrown with nyerereite, forms an elongate, lath-shaped crystal and most likely represents a retrograde transformation of ringwoodite or wadsleyite. All inclusions are composed of poly-mineralic solid mineral phases. Together with previously found halides, sulphates and other mineral inclusions in diamond from Juina, they form a carbonatitic-type mineral paragenesis in diamond which may have originated in the lower mantle and/or transition zone. Wustite inclusions with Mg# = 1.9—3.4, according to experimental data, may have formed in the lowermost mantle. The source for the observed carbonatitic-type mineral association in diamond is lower-mantle natrocarbonatitic magma. This magma may represent a juvenile mantle melt, or be the result of low-degree partial melting of deeply-subducted carbonated oceanic crust. This magma was rich in volatiles, such as Cl, F and H, which played an important role in the formation of diamond.

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“…5.5 software. The nitrogen content and its aggregation were calculated by applying the technique described in Taran et al (2004).…”

Section: Analytical Techniquesmentioning

confidence: 99%

Nyerereite and nahcolite inclusions in diamond: evidence for lower-mantle carbonatitic magmas

et al. 2009

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“…The work carried out included: external morphology study; diamond polishing to expose inclusions and to produce central plates for internal structure study by ABR and CL imaging; N content and aggregation investigation by FTIR with data processing as described in Taran et al (2006); chemical analysis of inclusions using SEM, EMP, SIMS; and in-situ C isotope investigation by SIMS in core-rim traverses of the polished crystals. As a result, three genetic groups of the diamonds were identified: ultradeep (UD), eclogitic (E) and peridotitic (P).…”

mentioning

confidence: 99%

Machado River, Brazil – a newly recognised ultradeep diamond occurrence

International Kimberlite Conference Extended Abstracts: 2008

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Morphology of Osteogenesis Imperfecta Collagen Mimetic Peptide Assemblies Correlates with the Identity of Glycine‐Substituting Residue

Yao

Liu

et al. 2019

ChemBioChem

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Osteogenesis imperfecta (OI) is a hereditary bone disorder with various phenotypes ranging from mild multiple fractures to perinatal lethal cases, and it mainly results from the substitution of Gly by a bulkier residue in type I collagen. Triple‐helical peptide models of Gly mutations have been widely utilized to decipher the etiology of OI, although these studies are mainly limited to characterizing the peptide features, such as stability and conformation in the solution state. Herein, we have constructed a new series of triple‐helical peptides DD(GPO)5ZPO(GPO)4DD (Z=Ala, Arg, Asp, Cys, Glu, Ser, and Val) mimicking the most common types of observed OI cases. The inclusion of special terminal aspartic acids enables these collagen mimetic peptides to self‐assemble to form nanomaterials upon the trigger of lanthanide ions. We have for the first time systematically evaluated the effect of different OI mutations on the aggregated state of collagen mimetic peptides. We have revealed that the identity of the Gly‐substituting residue plays a determinant role in the morphology and secondary structure of the collagen peptide assemblies, showing that bulkier residues tend to result in a disruptive secondary structure and defective morphology, which lead to more severe OI phenotypes. These findings of osteogenesis imperfecta collagen mimetic peptides in the aggregation state provide novel perspectives on the molecular mechanism of osteogenesis imperfecta, and may aid the development of new therapeutic strategies.

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Infrared spectroscopy study of nitrogen centers in microdiamonds from Ukrainian Neogene placers

Cited by 10 publications

References 15 publications

Nyerereite and nahcolite inclusions in diamond: evidence for lower-mantle carbonatitic magmas

Nyerereite and nahcolite inclusions in diamond: evidence for lower-mantle carbonatitic magmas

Machado River, Brazil – a newly recognised ultradeep diamond occurrence

Morphology of Osteogenesis Imperfecta Collagen Mimetic Peptide Assemblies Correlates with the Identity of Glycine‐Substituting Residue

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