A deep insight into a chemically homogeneous banded pumice sample: a role of crystal cargo immiscibility.
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| Title: | A deep insight into a chemically homogeneous banded pumice sample: a role of crystal cargo immiscibility. |
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| Authors: | AKIN, Lütfiye1 lutfiye_akin@hacettepe.edu.tr, AYDAR, Erkan1, CEYLAN, Abdullah2 |
| Source: | Turkish Journal of Earth Sciences. 2024, Vol. 33 Issue 3, p341-361. 26p. |
| Subjects: | Pumice, Immiscibility, Crystals, Attenuation coefficients, Mineral analysis |
| Geographic Terms: | Turkey |
| Abstract: | In this study, a set of representative banded rhyolitic pumice xenoliths collected from the ejecta of a basaltic cinder cone around Göllüdağ volcanic center, Central Anatolia, Türkiye, were characterized through whole-rock and mineral analyses, scanning electron microscopy (SEM), microcomputed tomography (µ-CT), and magnetization studies. The light- and dark-colored bands exhibit similar whole-rock chemistry, mainly distributed in rhyolite composition (71.35-71.66 wt.% SiO2). The dark pumice band shows high crystallinity (12-14 vol.%) with abundant subhedral-euhedral phenocrystals, microphenocrystals, and microlites, and a glass composition consisting of 71-76 wt.% SiO2. In contrast, the light pumice band exhibits relatively low crystallinity (1.86-8.08 vol.%) with phenocrystals and/or microphenocrystals, and a slightly higher silica content (74-77 wt.% SiO2). Both pumice bands display homogeneous distribution patterns with partially deformed and highly coalesced vesicles as observed through µ-CT and SEM studies. Additionally, we determined that the dark bands also contain magnetic minerals, which have a high attenuation coefficient and impart magnetic properties to the bands. The discrepancy in the crystal population between the light and dark pumice bands is attributed to the process occurring within the magma ascending throughout the conduit. We suggest that the response of the crystals involves separation and enrichment within their flow patterns, which prevents homogenization and results in a degree of mechanical immiscibility of the layers. [ABSTRACT FROM AUTHOR] |
| Copyright of Turkish Journal of Earth Sciences is the property of Scientific and Technical Research Council of Turkey and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 176894208 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: A deep insight into a chemically homogeneous banded pumice sample: a role of crystal cargo immiscibility. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22AKIN%2C+Lütfiye%22">AKIN, Lütfiye</searchLink><relatesTo>1</relatesTo><i> lutfiye_akin@hacettepe.edu.tr</i><br /><searchLink fieldCode="AR" term="%22AYDAR%2C+Erkan%22">AYDAR, Erkan</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22CEYLAN%2C+Abdullah%22">CEYLAN, Abdullah</searchLink><relatesTo>2</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Turkish+Journal+of+Earth+Sciences%22">Turkish Journal of Earth Sciences</searchLink>. 2024, Vol. 33 Issue 3, p341-361. 26p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Pumice%22">Pumice</searchLink><br /><searchLink fieldCode="DE" term="%22Immiscibility%22">Immiscibility</searchLink><br /><searchLink fieldCode="DE" term="%22Crystals%22">Crystals</searchLink><br /><searchLink fieldCode="DE" term="%22Attenuation+coefficients%22">Attenuation coefficients</searchLink><br /><searchLink fieldCode="DE" term="%22Mineral+analysis%22">Mineral analysis</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Turkey%22">Turkey</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: In this study, a set of representative banded rhyolitic pumice xenoliths collected from the ejecta of a basaltic cinder cone around Göllüdağ volcanic center, Central Anatolia, Türkiye, were characterized through whole-rock and mineral analyses, scanning electron microscopy (SEM), microcomputed tomography (µ-CT), and magnetization studies. The light- and dark-colored bands exhibit similar whole-rock chemistry, mainly distributed in rhyolite composition (71.35-71.66 wt.% SiO2). The dark pumice band shows high crystallinity (12-14 vol.%) with abundant subhedral-euhedral phenocrystals, microphenocrystals, and microlites, and a glass composition consisting of 71-76 wt.% SiO2. In contrast, the light pumice band exhibits relatively low crystallinity (1.86-8.08 vol.%) with phenocrystals and/or microphenocrystals, and a slightly higher silica content (74-77 wt.% SiO2). Both pumice bands display homogeneous distribution patterns with partially deformed and highly coalesced vesicles as observed through µ-CT and SEM studies. Additionally, we determined that the dark bands also contain magnetic minerals, which have a high attenuation coefficient and impart magnetic properties to the bands. The discrepancy in the crystal population between the light and dark pumice bands is attributed to the process occurring within the magma ascending throughout the conduit. We suggest that the response of the crystals involves separation and enrichment within their flow patterns, which prevents homogenization and results in a degree of mechanical immiscibility of the layers. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Turkish Journal of Earth Sciences is the property of Scientific and Technical Research Council of Turkey and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.55730/1300-0985.1915 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 26 StartPage: 341 Subjects: – SubjectFull: Pumice Type: general – SubjectFull: Immiscibility Type: general – SubjectFull: Crystals Type: general – SubjectFull: Attenuation coefficients Type: general – SubjectFull: Mineral analysis Type: general – SubjectFull: Turkey Type: general Titles: – TitleFull: A deep insight into a chemically homogeneous banded pumice sample: a role of crystal cargo immiscibility. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: AKIN, Lütfiye – PersonEntity: Name: NameFull: AYDAR, Erkan – PersonEntity: Name: NameFull: CEYLAN, Abdullah IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 04 Text: 2024 Type: published Y: 2024 Identifiers: – Type: issn-print Value: 13000985 Numbering: – Type: volume Value: 33 – Type: issue Value: 3 Titles: – TitleFull: Turkish Journal of Earth Sciences Type: main |
| ResultId | 1 |
