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No more blind dates with calcite: Fluid-flow vs. fault-slip along the Očkov thrust, Prague Basin
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SYSNO ASEP 0539613 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title No more blind dates with calcite: Fluid-flow vs. fault-slip along the Očkov thrust, Prague Basin Author(s) Roberts, N. M. W. (GB)
Žák, J. (CZ)
Vacek, F. (CZ)
Sláma, Jiří (GLU-S) SAI, RID, ORCIDArticle number 101143 Source Title Geoscience Frontiers. - : Office of Geoscience Frontiers Media - ISSN 1674-9871
Roč. 12, č. 4 (2021)Number of pages 12 s. Language eng - English Country CN - China Keywords U-Pb geochronology ; Calcite ; Fault dating ; Fluid-flow ; Prague Basin ; LA-ICP-MS Subject RIV DB - Geology ; Mineralogy OECD category Geology Method of publishing Open access Institutional support GLU-S - RVO:67985831 UT WOS 000654356800013 EID SCOPUS 85099824595 DOI 10.1016/j.gsf.2021.101143 Annotation Dating of fracture-filling calcitewith U-Pb geochronology is becoming a rapidly adopted technique for determining
the absolute timing of brittle deformation in the upper crust. Slickenfibre calcite is a desirable target, as it precipitates between individual fault slip displacement events, and provides additional kinematic information. Here we present a case study of slickenfibres formed on the Očkov thrust in the Lower Palaezoic Prague Basin, Bohemian Massif, utilising a combination of petrographic and in situ methods. We demonstrate that slickenfibre external textures can be preserved, whilst internally primary textures are removed by fluid infiltration and recrystallization, leading to variable U and Pb mobilisation. One slickenfibre yielded a date of ca. 250 Ma,
which we interpret as recording fault slip along the Očkov thrust. Another cross-cutting slickenfibre yielded
more scattered U-Pb data, with an imprecise apparent age around ca. 95 Ma. This slickenfibre is recrystallised,
destroying the primary textures, and exhibits element mobility. The meaning of this younger apparent age is
therefore questionable, whereas it likely reflects Cretaceous U and Pb mobility assisted by fluid-flow along the
fault plane, it may not reflect a period of fault slip. Our results demonstrate that slickenfibre-based U-Pb dates
do not unequivocally relate to fault motion, and that petrographic and elemental analyses are important requirements for interpreting calcite U-Pb data.Workplace Institute of Geology Contact Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Year of Publishing 2022 Electronic address https://www.sciencedirect.com/science/article/pii/S1674987121000074
Number of the records: 1