Plagioclase zoning in younger basaltic-andesitic lavas of Ungaran Volcano, Central Java: evidence to magmatic processes
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| Title: | Plagioclase zoning in younger basaltic-andesitic lavas of Ungaran Volcano, Central Java: evidence to magmatic processes |
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| Authors: | Marin, J, Wulandari, K, Pamungkas, A B, Martadiastuti, V, Winarno, T |
| Source: | IOP Conference Series: Earth and Environmental Science ; volume 1569, issue 1, page 012019 ; ISSN 1755-1307 1755-1315 |
| Publisher Information: | IOP Publishing |
| Publication Year: | 2025 |
| Description: | Ungaran is a Quaternary volcano located in the Sunda-Banda arc which is characterized by basaltic-andesitic composition. As a volcano with geothermal potential, its petrological characteristics and magmatic evolution must be studied thoroughly. This research focuses on plagioclase as a mineral that can provide information about the cooling history of igneous rock. The rock samples taken in this research were lavas from Younger Ungaran volcanic products. Thin section and x-ray fluorescence geochemical analysis were carried out to determine the characteristics of the lava. The texture and chemical composition of the plagioclase mineral were determined through back scattered electron image of Scanning Electron Microscope analysis. Results show that the lavas of Younger Ungaran volcanic have basaltic to andesitic composition, with plagioclase and pyroxene as main minerals and accessory minerals such as hornblende, biotite, olivine and ferromagnesian. Plagioclase has a composition of andesine-labradorite and bytownite with the appearance of crystal zoning and sieve texture. Mineral geochemical analysis using SEM shows normal, reverse, and oscillatory zoning patterns in almost all lava samples. From the zoning patterns, it can be interpreted that the magmatic processes during igneous rock formations. Normal and reverse zoning are the result of temperature and composition shifts during crystal fractionation and magma mixing. Meanwhile, oscillatory zoning can be explained as fluctuation of the crystal condition in the convective magma chamber for a relatively long time before it solidified as volcanic rocks. |
| Document Type: | article in journal/newspaper |
| Language: | unknown |
| DOI: | 10.1088/1755-1315/1569/1/012019 |
| DOI: | 10.1088/1755-1315/1569/1/012019/pdf |
| Availability: | https://doi.org/10.1088/1755-1315/1569/1/012019 https://iopscience.iop.org/article/10.1088/1755-1315/1569/1/012019 https://iopscience.iop.org/article/10.1088/1755-1315/1569/1/012019/pdf |
| Rights: | https://creativecommons.org/licenses/by/4.0/ ; https://iopscience.iop.org/info/page/text-and-data-mining |
| Accession Number: | edsbas.F92F9C58 |
| Database: | BASE |
Nájsť tento článok vo Web of Science | Abstract: | Ungaran is a Quaternary volcano located in the Sunda-Banda arc which is characterized by basaltic-andesitic composition. As a volcano with geothermal potential, its petrological characteristics and magmatic evolution must be studied thoroughly. This research focuses on plagioclase as a mineral that can provide information about the cooling history of igneous rock. The rock samples taken in this research were lavas from Younger Ungaran volcanic products. Thin section and x-ray fluorescence geochemical analysis were carried out to determine the characteristics of the lava. The texture and chemical composition of the plagioclase mineral were determined through back scattered electron image of Scanning Electron Microscope analysis. Results show that the lavas of Younger Ungaran volcanic have basaltic to andesitic composition, with plagioclase and pyroxene as main minerals and accessory minerals such as hornblende, biotite, olivine and ferromagnesian. Plagioclase has a composition of andesine-labradorite and bytownite with the appearance of crystal zoning and sieve texture. Mineral geochemical analysis using SEM shows normal, reverse, and oscillatory zoning patterns in almost all lava samples. From the zoning patterns, it can be interpreted that the magmatic processes during igneous rock formations. Normal and reverse zoning are the result of temperature and composition shifts during crystal fractionation and magma mixing. Meanwhile, oscillatory zoning can be explained as fluctuation of the crystal condition in the convective magma chamber for a relatively long time before it solidified as volcanic rocks. |
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| DOI: | 10.1088/1755-1315/1569/1/012019 |