A Miocene fault in south-east Ireland revealed by 40Ar-39Ar dating of hydrothermal cryptomelane

David B. Jordan; Ray Burgess

doi:10.3318/ijes.2007.25.55

A Miocene fault in south-east Ireland revealed by 40Ar-39Ar dating of hydrothermal cryptomelane

David B. Jordan^*, Ray Burgess

^*Corresponding author for this work

University of Dublin Trinity College

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Pages (from-to)	55-61
Number of pages	7
Journal	Irish Journal of Earth Sciences
Volume	25
DOIs	https://doi.org/10.3318/ijes.2007.25.55
Publication status	Published - 2007

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10.3318/ijes.2007.25.55

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AB - 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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A Miocene fault in south-east Ireland revealed by 40Ar-39Ar dating of hydrothermal cryptomelane

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