A. V. Korsakov, D. S. Mikhailenko, A. O. Serebryannikov, A. M. Logvinova, D. P. Gladkochub
{"title":"Inclusion of Kokchetavite in a Diamond Crystal from Venezuela: Evidence of Subduction of the Continental Crust","authors":"A. V. Korsakov, D. S. Mikhailenko, A. O. Serebryannikov, A. M. Logvinova, D. P. Gladkochub","doi":"10.1134/s1028334x24601317","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Diamond crystals with numerous mineral inclusions from the Guanamo placer deposit (Venezuela) were studied in detail. The inclusions in the studied diamonds are represented by a set of minerals typical of eclogite paragenesis indicators—omphacite, garnet, kyanite, coesite and rutile. Besides single mineral inclusions, multiphase inclusions were also identified. Mineral associations of multiphase inclusions adjacent within less than 100 microns of each other within the same growth zone can vary considerably. For example, in one of the diamond crystals examined, multiphase inclusions are represented by the following associations: sanidine-dolomite-anatase and magnetite-rutile-dolomite-apatite-kokchetavite-graphite. Note that this is the first discovery of kokchetavite as an inclusion in kimberlite diamond crystals. Until now, this hexagonal polymorphic modification of KAlSi<sub>3</sub>O<sub>8</sub> has only been diagnosed in minerals from rocks of the continental crust that were formed under conditions of high or ultra-high pressure metamorphism. Thus, the subduction of continental crustal material into the mantle and its important role in the metasomatic alteration of upper mantle rocks in Venezuela can be inferred from the presence of kokchetavite as inclusions in kimberlite diamond crystals.</p>","PeriodicalId":11352,"journal":{"name":"Doklady Earth Sciences","volume":null,"pages":null},"PeriodicalIF":0.7000,"publicationDate":"2024-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Doklady Earth Sciences","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1134/s1028334x24601317","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Diamond crystals with numerous mineral inclusions from the Guanamo placer deposit (Venezuela) were studied in detail. The inclusions in the studied diamonds are represented by a set of minerals typical of eclogite paragenesis indicators—omphacite, garnet, kyanite, coesite and rutile. Besides single mineral inclusions, multiphase inclusions were also identified. Mineral associations of multiphase inclusions adjacent within less than 100 microns of each other within the same growth zone can vary considerably. For example, in one of the diamond crystals examined, multiphase inclusions are represented by the following associations: sanidine-dolomite-anatase and magnetite-rutile-dolomite-apatite-kokchetavite-graphite. Note that this is the first discovery of kokchetavite as an inclusion in kimberlite diamond crystals. Until now, this hexagonal polymorphic modification of KAlSi3O8 has only been diagnosed in minerals from rocks of the continental crust that were formed under conditions of high or ultra-high pressure metamorphism. Thus, the subduction of continental crustal material into the mantle and its important role in the metasomatic alteration of upper mantle rocks in Venezuela can be inferred from the presence of kokchetavite as inclusions in kimberlite diamond crystals.
期刊介绍：
Doklady Earth Sciences is a journal that publishes new research in Earth science of great significance. Initially the journal was a forum of the Russian Academy of Science and published only best contributions from Russia. Now the journal welcomes submissions from any country in the English or Russian language. Every manuscript must be recommended by Russian or foreign members of the Russian Academy of Sciences.
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