Multi fluid-flow record during episodic mode I opening: A microstructural and SIMS study (Cotiella Thrust Fault, Pyrenees)

摘要: Abstract Syntectonic veins commonly have been used to assess the composition and source of fluids involved in fault zone activity. Such also provide information on ambient stress conditions during deformation mineralization. Based bulk sampling O- C-isotope analysis, combined with fluid inclusion microthermometry, many studies demonstrated that syntectonic snapshots over course history. This is widely acknowledged for mode I extension develop damage zones faults. However, an important unanswered question extent which such record a more detailed history at micron scale. In this study, we present new in-situ micron-scale δ 18 O data, measured using Secondary Ion Mass Spectrometry (SIMS), microthermometry Δ47 clumped isotope thermometry document temperature vein growth related along Cotiella thrust (Pyrenees). All studied show three distinct episodes opening, recording complex varying temperature. Results portion passed from hydrological rock-buffered system, formation waters were isotopic equilibrium host sediments, fluid-buffered system involving meteoric water. only achievable scale Spectrometry. study demonstrates potential these micro-beam techniques investigating behavior detail than previously available, particularly respect nature P–T extant