Chemical Modification of Lherzolite Xenoliths Due to Interaction with Host Basanite Melt: Evidence from Tumusun Volcano, Baikal Rift Zone
To investigate the process and chemistry of mineral reaction zone formation, we conducted detailed petrographic observations and chemical analysis of rocks and minerals of spinel lherzolite xenoliths from basanites of Tumusun volcano (Baikal Rift Zone). The reaction zones gradually disappear from co...
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| Format: | Article |
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MDPI AG
2023-03-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/13/3/403 |
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| author | Marina A. Gornova Vasiliy A. Belyaev Anas A. Karimov Alexander B. Perepelov Sergei I. Dril |
| author_facet | Marina A. Gornova Vasiliy A. Belyaev Anas A. Karimov Alexander B. Perepelov Sergei I. Dril |
| author_sort | Marina A. Gornova |
| collection | DOAJ |
| description | To investigate the process and chemistry of mineral reaction zone formation, we conducted detailed petrographic observations and chemical analysis of rocks and minerals of spinel lherzolite xenoliths from basanites of Tumusun volcano (Baikal Rift Zone). The reaction zones gradually disappear from contact toward the center of the xenoliths. The influence of basanite melt on major and trace element composition of secondary minerals of reaction zones is notable only at a distance up to 100–200 μm from the contact. At a distance of 0.3–1.0 mm from the contact, the major and trace composition of secondary clinopyroxenes from the orthopyroxene reaction zone indicates their formation from a melt formed by dissolution of orthopyroxene and influenced by the element diffusion from basanite melt. Inside xenoliths, the secondary minerals have Mg# values equal to or higher than Mg# of primary minerals, and secondary clinopyroxenes inherit their depleted or enriched REE pattern from primary pyroxenes. The compositional variations in secondary clinopyroxenes testify melt heterogeneity. Clinopyroxene rims have slightly higher LILE and similar abundances of other trace elements compared to clinopyroxene cores. This is consistent with the model developed from experimental studies: due to the interaction with basanite, incongruent dissolution of orthopyroxene occurs to form a melt which circulates in lherzolite and leads to pyroxenes and spinel dissolution. Diffusion of elements from basanite results in lherzolite enrichment in K, Na, Rb, Ba, La, and Ce, which are incorporated in feldspars and clinopyroxene of reaction zones as well as in feldspar veinlets. Non-dissolved mineral cores are homogenous and similar in major and trace element composition to primary minerals without reaction rims. |
| first_indexed | 2024-03-11T06:08:13Z |
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| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-11T06:08:13Z |
| publishDate | 2023-03-01 |
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| series | Minerals |
| spelling | doaj.art-524de33778ad48e39d8d8534290a50192023-11-17T12:48:06ZengMDPI AGMinerals2075-163X2023-03-0113340310.3390/min13030403Chemical Modification of Lherzolite Xenoliths Due to Interaction with Host Basanite Melt: Evidence from Tumusun Volcano, Baikal Rift ZoneMarina A. Gornova0Vasiliy A. Belyaev1Anas A. Karimov2Alexander B. Perepelov3Sergei I. Dril4Vinogradov Institute of Geochemistry, Siberian Branch of Russian Academy of Sciences, 1A, Favorsky St., 664033 Irkutsk, RussiaVinogradov Institute of Geochemistry, Siberian Branch of Russian Academy of Sciences, 1A, Favorsky St., 664033 Irkutsk, RussiaVinogradov Institute of Geochemistry, Siberian Branch of Russian Academy of Sciences, 1A, Favorsky St., 664033 Irkutsk, RussiaVinogradov Institute of Geochemistry, Siberian Branch of Russian Academy of Sciences, 1A, Favorsky St., 664033 Irkutsk, RussiaVinogradov Institute of Geochemistry, Siberian Branch of Russian Academy of Sciences, 1A, Favorsky St., 664033 Irkutsk, RussiaTo investigate the process and chemistry of mineral reaction zone formation, we conducted detailed petrographic observations and chemical analysis of rocks and minerals of spinel lherzolite xenoliths from basanites of Tumusun volcano (Baikal Rift Zone). The reaction zones gradually disappear from contact toward the center of the xenoliths. The influence of basanite melt on major and trace element composition of secondary minerals of reaction zones is notable only at a distance up to 100–200 μm from the contact. At a distance of 0.3–1.0 mm from the contact, the major and trace composition of secondary clinopyroxenes from the orthopyroxene reaction zone indicates their formation from a melt formed by dissolution of orthopyroxene and influenced by the element diffusion from basanite melt. Inside xenoliths, the secondary minerals have Mg# values equal to or higher than Mg# of primary minerals, and secondary clinopyroxenes inherit their depleted or enriched REE pattern from primary pyroxenes. The compositional variations in secondary clinopyroxenes testify melt heterogeneity. Clinopyroxene rims have slightly higher LILE and similar abundances of other trace elements compared to clinopyroxene cores. This is consistent with the model developed from experimental studies: due to the interaction with basanite, incongruent dissolution of orthopyroxene occurs to form a melt which circulates in lherzolite and leads to pyroxenes and spinel dissolution. Diffusion of elements from basanite results in lherzolite enrichment in K, Na, Rb, Ba, La, and Ce, which are incorporated in feldspars and clinopyroxene of reaction zones as well as in feldspar veinlets. Non-dissolved mineral cores are homogenous and similar in major and trace element composition to primary minerals without reaction rims.https://www.mdpi.com/2075-163X/13/3/403mantle xenolithlherzoliteclinopyroxenebasanitereaction zonemelt-peridotite interaction |
| spellingShingle | Marina A. Gornova Vasiliy A. Belyaev Anas A. Karimov Alexander B. Perepelov Sergei I. Dril Chemical Modification of Lherzolite Xenoliths Due to Interaction with Host Basanite Melt: Evidence from Tumusun Volcano, Baikal Rift Zone Minerals mantle xenolith lherzolite clinopyroxene basanite reaction zone melt-peridotite interaction |
| title | Chemical Modification of Lherzolite Xenoliths Due to Interaction with Host Basanite Melt: Evidence from Tumusun Volcano, Baikal Rift Zone |
| title_full | Chemical Modification of Lherzolite Xenoliths Due to Interaction with Host Basanite Melt: Evidence from Tumusun Volcano, Baikal Rift Zone |
| title_fullStr | Chemical Modification of Lherzolite Xenoliths Due to Interaction with Host Basanite Melt: Evidence from Tumusun Volcano, Baikal Rift Zone |
| title_full_unstemmed | Chemical Modification of Lherzolite Xenoliths Due to Interaction with Host Basanite Melt: Evidence from Tumusun Volcano, Baikal Rift Zone |
| title_short | Chemical Modification of Lherzolite Xenoliths Due to Interaction with Host Basanite Melt: Evidence from Tumusun Volcano, Baikal Rift Zone |
| title_sort | chemical modification of lherzolite xenoliths due to interaction with host basanite melt evidence from tumusun volcano baikal rift zone |
| topic | mantle xenolith lherzolite clinopyroxene basanite reaction zone melt-peridotite interaction |
| url | https://www.mdpi.com/2075-163X/13/3/403 |
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