{"title":"Time constraints on the deposition of a mineralisation-proximal metavolcaniclastic rock at Byngsbodberget, northwest of Falun, Bergslagen, Sweden","authors":"Alexander Lewerentz, M. Ripa, G. Morris","doi":"10.1080/11035897.2021.1896573","DOIUrl":null,"url":null,"abstract":"ABSTRACT Metavolcanic rocks in the area north and northwest of Falun, Bergslagen, Sweden host numerous mineralisations and historic mines. The stratigraphy and formation ages of these metavolcanic rocks however remains unresolved on the local scale. This study aims to add at least some pieces to that puzzle by exploring age-constrains for the deposition of a metavolcaniclastic rock at Byngsbodberget, c. 15 km west-northwest of Falun. U-Pb SIMS analyses were conducted on zircon, from which a concordia age is calculated at 1900 ± 9 Ma and interpreted as the age of the main volcanic event that contributed material to the studied volcaniclastic rock. Based on observations of way-up indicators, this is thought to mark the lower parts of the local volcanic stratigraphy.","PeriodicalId":55094,"journal":{"name":"Gff","volume":"143 1","pages":"321 - 327"},"PeriodicalIF":1.2000,"publicationDate":"2021-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/11035897.2021.1896573","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Gff","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1080/11035897.2021.1896573","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"GEOLOGY","Score":null,"Total":0}
引用次数: 1
Abstract
ABSTRACT Metavolcanic rocks in the area north and northwest of Falun, Bergslagen, Sweden host numerous mineralisations and historic mines. The stratigraphy and formation ages of these metavolcanic rocks however remains unresolved on the local scale. This study aims to add at least some pieces to that puzzle by exploring age-constrains for the deposition of a metavolcaniclastic rock at Byngsbodberget, c. 15 km west-northwest of Falun. U-Pb SIMS analyses were conducted on zircon, from which a concordia age is calculated at 1900 ± 9 Ma and interpreted as the age of the main volcanic event that contributed material to the studied volcaniclastic rock. Based on observations of way-up indicators, this is thought to mark the lower parts of the local volcanic stratigraphy.
期刊介绍：
GFF is the journal of the Geological Society of Sweden. It is an international scientific journal that publishes papers in English covering the whole field of geology and palaeontology, i.e. petrology, mineralogy, stratigraphy, systematic palaeontology, palaeogeography, historical geology and Quaternary geology. Systematic descriptions of fossils, minerals and rocks are an important part of GFF''s publishing record. Papers on regional or local geology should deal with Balto-Scandian or Northern European geology, or with geologically related areas. Papers on geophysics, geochemistry, biogeochemistry, climatology and hydrology should have a geological context. Descriptions of new methods (analytical, instrumental or numerical), should be relevant to the broad scope of the journal. Review articles are welcome, and may be solicited occasionally. Thematic issues are also possible.
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