{"title":"Assimilation of Carbonates by Mafic Magma: Fassaite Gabbro of the Olkhon Terrane (Western Baikal Region)","authors":"E. V. Sklyarov, A. V. Lavrenchuk, D. V. Semenova","doi":"10.1134/s1028334x24603055","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Specific gabbro with the main rock-forming mineral of fassaite—alumina-rich (up to 12 wt % Al<sub>2</sub>O<sub>3</sub>) calcium pyroxene, typical of high-temperature metasomatic rocks, are characterized. In terms of the geochemical characteristics, the fassaite gabbros are close to the subalkaline monzogabbros of the Ust’-Krestovsky complex, which are widely distributed within the Krestovsky subterrane of the Olkhon terrane (Western Baikal region). At the same time, they differ sharply from the latter in having a higher content of CaO and MgO and a lower content of SiO<sub>2</sub> and Al<sub>2</sub>O<sub>3</sub>. Fassaite gabbro composes several small bodies framed the Ust’-Krestovsky monzogabbro massif, without contacting the latter. A model of the formation of fassaite gabbro due to the assimilation of carbonate (crustal carbonate melts) by subalkaline mafic magma is proposed.</p>","PeriodicalId":11352,"journal":{"name":"Doklady Earth Sciences","volume":"73 1","pages":""},"PeriodicalIF":0.7000,"publicationDate":"2024-09-04","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/s1028334x24603055","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
Specific gabbro with the main rock-forming mineral of fassaite—alumina-rich (up to 12 wt % Al2O3) calcium pyroxene, typical of high-temperature metasomatic rocks, are characterized. In terms of the geochemical characteristics, the fassaite gabbros are close to the subalkaline monzogabbros of the Ust’-Krestovsky complex, which are widely distributed within the Krestovsky subterrane of the Olkhon terrane (Western Baikal region). At the same time, they differ sharply from the latter in having a higher content of CaO and MgO and a lower content of SiO2 and Al2O3. Fassaite gabbro composes several small bodies framed the Ust’-Krestovsky monzogabbro massif, without contacting the latter. A model of the formation of fassaite gabbro due to the assimilation of carbonate (crustal carbonate melts) by subalkaline mafic magma is proposed.
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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