{"title":"埃塞俄比亚西北部火山高原 Mekane Selam 地区双峰火山岩组的火山地层学和岩石学","authors":"Habtamu Alemu Alehegn","doi":"10.1007/s00445-024-01705-z","DOIUrl":null,"url":null,"abstract":"<p>The volcanic stratigraphy and petrography of compositionally bimodal volcanic rocks in the Mekane Selam area were characterized by detailed field investigation, spatial and systematic sampling, and petrographic analysis. Three successions of basaltic rocks with rhyolitic and trachytic rock units at the top with a substantial volume of felsic pyroclastic deposits were categorized as the typical lithological formations in the study area. Volcanic rock types present in the study area include plagioclase phyric basalt, plagioclase-pyroxene phyric basalt, pyroxene-plagioclase phyric basalt, pyroxene-olivine phyric basalt, pyroxene phyric basalt, olivine phyric basalt, rhyolite, and trachyte from bottom to top. The basaltic rocks are composed of plagioclase, clinopyroxene, and olivine phenocrysts with minor Fe-Ti oxides (ilmenite and magnetites). The common phenocrysts of trachyte rocks are sanidine, plagioclase, Fe-Ti oxides, and minor hornblende and green pyroxenes (aegirine). Rhyolites contain quartz and sanidine phenocrysts.</p>","PeriodicalId":55297,"journal":{"name":"Bulletin of Volcanology","volume":"2 1","pages":""},"PeriodicalIF":3.6000,"publicationDate":"2024-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Volcano-stratigraphy and petrography of bimodal volcanic rocks suites of Mekane Selam area, northwestern Ethiopian volcanic plateau\",\"authors\":\"Habtamu Alemu Alehegn\",\"doi\":\"10.1007/s00445-024-01705-z\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>The volcanic stratigraphy and petrography of compositionally bimodal volcanic rocks in the Mekane Selam area were characterized by detailed field investigation, spatial and systematic sampling, and petrographic analysis. Three successions of basaltic rocks with rhyolitic and trachytic rock units at the top with a substantial volume of felsic pyroclastic deposits were categorized as the typical lithological formations in the study area. Volcanic rock types present in the study area include plagioclase phyric basalt, plagioclase-pyroxene phyric basalt, pyroxene-plagioclase phyric basalt, pyroxene-olivine phyric basalt, pyroxene phyric basalt, olivine phyric basalt, rhyolite, and trachyte from bottom to top. The basaltic rocks are composed of plagioclase, clinopyroxene, and olivine phenocrysts with minor Fe-Ti oxides (ilmenite and magnetites). The common phenocrysts of trachyte rocks are sanidine, plagioclase, Fe-Ti oxides, and minor hornblende and green pyroxenes (aegirine). Rhyolites contain quartz and sanidine phenocrysts.</p>\",\"PeriodicalId\":55297,\"journal\":{\"name\":\"Bulletin of Volcanology\",\"volume\":\"2 1\",\"pages\":\"\"},\"PeriodicalIF\":3.6000,\"publicationDate\":\"2024-02-19\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Bulletin of Volcanology\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://doi.org/10.1007/s00445-024-01705-z\",\"RegionNum\":2,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"GEOSCIENCES, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Bulletin of Volcanology","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1007/s00445-024-01705-z","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}
Volcano-stratigraphy and petrography of bimodal volcanic rocks suites of Mekane Selam area, northwestern Ethiopian volcanic plateau
The volcanic stratigraphy and petrography of compositionally bimodal volcanic rocks in the Mekane Selam area were characterized by detailed field investigation, spatial and systematic sampling, and petrographic analysis. Three successions of basaltic rocks with rhyolitic and trachytic rock units at the top with a substantial volume of felsic pyroclastic deposits were categorized as the typical lithological formations in the study area. Volcanic rock types present in the study area include plagioclase phyric basalt, plagioclase-pyroxene phyric basalt, pyroxene-plagioclase phyric basalt, pyroxene-olivine phyric basalt, pyroxene phyric basalt, olivine phyric basalt, rhyolite, and trachyte from bottom to top. The basaltic rocks are composed of plagioclase, clinopyroxene, and olivine phenocrysts with minor Fe-Ti oxides (ilmenite and magnetites). The common phenocrysts of trachyte rocks are sanidine, plagioclase, Fe-Ti oxides, and minor hornblende and green pyroxenes (aegirine). Rhyolites contain quartz and sanidine phenocrysts.
期刊介绍：
Bulletin of Volcanology was founded in 1922, as Bulletin Volcanologique, and is the official journal of the International Association of Volcanology and Chemistry of the Earth’s Interior (IAVCEI). The Bulletin of Volcanology publishes papers on volcanoes, their products, their eruptive behavior, and their hazards. Papers aimed at understanding the deeper structure of volcanoes, and the evolution of magmatic systems using geochemical, petrological, and geophysical techniques are also published. Material is published in four sections: Review Articles; Research Articles; Short Scientific Communications; and a Forum that provides for discussion of controversial issues and for comment and reply on previously published Articles and Communications.
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