HPHT-Treated Impact Diamonds from the Popigai Crater (Siberian Craton): XRD and Raman Spectroscopy Evidence-Reference-Cited by-同舟云学术

HPHT-Treated Impact Diamonds from the Popigai Crater (Siberian Craton): XRD and Raman Spectroscopy Evidence

Published:2023-01-20 Issue:2 Volume:13 Page:154
ISSN:2075-163X
Container-title:Minerals
language:en
Short-container-title:Minerals

Author:

Chepurov Anatoly¹,Goryainov Sergey¹^ORCID,Gromilov Sergey²,Zhimulev Egor¹,Sonin Valeriy¹,Chepurov Aleksey¹^ORCID,Karpovich Zakhar¹,Afanasiev Valentin¹^ORCID,Pokhilenko Nikolay¹

Affiliation:

1. V.S. Sobolev Institute of Geology and Mineralogy SB RAS, 3 Akademika Koptyuga, 630090 Novosibirsk, Russia

2. Nikolaev Institute of Inorganic Chemistry SB RAS, 3 Acad. Lavrentiev Ave., 630090 Novosibirsk, Russia

Abstract

Phase change and graphitization of diamonds from the Popigai impact crater (Krasnoyarsk Territory, Siberian platform, Russia) exposed to high-pressure high-temperature (HPHT) conditions of 5.5 GPa and 2000–2200 °C are studied by Raman spectroscopy and X-ray diffractometry (XRD). Light-color diamonds of type 1, free from inclusions, with 0 to 10 % lonsdaleite, are more resistant to HPHT effects than dark diamonds of type 2 rich in lonsdaleite and graphite. The lonsdaleite/diamond ratios in lonsdaleite-bearing impact diamonds become smaller upon annealing, possibly because lonsdaleite transforms to cubic diamond simultaneously with graphitization. Therefore, lonsdaleite is more likely a structure defect in diamond than a separate hexagonal phase.

Funder

the Ministry of Science and Higher Education of the Russian Federation

Publisher

MDPI AG

Subject

Geology,Geotechnical Engineering and Engineering Geology

Link

https://www.mdpi.com/2075-163X/13/2/154/pdf

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