{"title":"A Miocene Fault in South-East Ireland Revealed by ⁴⁰Ar-³⁹Ar Dating of Hydrothermal Cryptomelane","authors":"D. Jordan, R. Burgess","doi":"10.3318/IJES.2007.25.55","DOIUrl":null,"url":null,"abstract":"Abstract:The Shankill Fracture Zone is one of several faults that are possibly related, which transect the Devonian-aged Leinster Granite of south-east Ireland. The fault contains epithermal mineralisation, including a hydrothermal breccia that is cemented by the potassium-bearing manganese oxide, cryptomelane. ⁴⁰Ar/³⁹Ar dating of cryptomelane from the breccia yielded a Miocene mineralisation age of 12.1 ± 1.6Ma (2σ), believed to be coincident with tectonohydrothermal activity along the Shankill Fracture Zone. This fracture zone is the only confirmed onshore Neogene fault in Ireland that is not located in the north-east of the country.","PeriodicalId":35911,"journal":{"name":"Irish Journal of Earth Sciences","volume":"25 1","pages":"55 - 61"},"PeriodicalIF":0.0000,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Irish Journal of Earth Sciences","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.3318/IJES.2007.25.55","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"Earth and Planetary Sciences","Score":null,"Total":0}
引用次数: 1
Abstract
Abstract:The Shankill Fracture Zone is one of several faults that are possibly related, which transect the Devonian-aged Leinster Granite of south-east Ireland. The fault contains epithermal mineralisation, including a hydrothermal breccia that is cemented by the potassium-bearing manganese oxide, cryptomelane. ⁴⁰Ar/³⁹Ar dating of cryptomelane from the breccia yielded a Miocene mineralisation age of 12.1 ± 1.6Ma (2σ), believed to be coincident with tectonohydrothermal activity along the Shankill Fracture Zone. This fracture zone is the only confirmed onshore Neogene fault in Ireland that is not located in the north-east of the country.
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