New data on the composition of tagamites of the Popigai astrobleme

E. V. Shchukina, V. P. Afanasiev, K. V. Lobov, E. V. Malygina, N. P. Pokhilenko

Research output: Contribution to journalArticlepeer-review

Abstract

New data on the composition of tagamites (impact melt rocks) of the Popigai atsrobleme (Siberia) are presented. The preliminary results support the following major conclusions: (1) the matrix of the studied tagamites is crystallized and is composed of identified minerals; (2) the degree of the matrix crystallization and the amount of inclusions in tagamites can vary significantly; (3) tagamites are identical to the intracrater gneisses of the Popigai astrobleme by the REE contents and are distinct from them by significantly lower SiO2 and higher Al2O3, FeO, MgO, and CaO contents; (4) the Popigai tagamites and intracrater gneisses are enriched in Ni (on average) in comparison with gneisses of the Khapchan Group; and (5) the various (often sufficient) degrees of crystallization of tagamites indicate the duration of the cooling of the melt, when diamonds could possibly have been dissolved.

Original languageEnglish
Pages (from-to)333-337
Number of pages5
JournalDoklady Earth Sciences
Volume473
Issue number1
DOIs
Publication statusPublished - 1 Mar 2017
Externally publishedYes

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