1887
Volume 30, Issue 2
  • E-ISSN: 1365-2117

Abstract

Abstract

This study aims at understanding the origin and nature of syn‐orogenic fluid flow in the Jaca basin from the South Pyrenean fold and thrust‐belt, as recorded in calcite and quartz veins of the Sierras Interiores (Spain) and the turbiditic basin, which cover upper Cretaceous to Late Eocene syntectonic deposits. The fracture network consists of a classical pattern of transverse and longitudinal fractures related to Layer Parallel Shortening (LPS) and folding respectively. Veins filled equally about the third of fractures in the carbonate shelf and turbidites. Carbon and oxygen isotopes of calcite veins mostly indicate precipitation from isotopically buffered water, consistent with high water‐rock interaction. In the Sierras Interiores, petrographical observations and fluid inclusion microthermometry are consistent with two distinct stages of precipitation. The first stage is characterized by relatively low Th and low salinities (155–205 °C and 0.5–3.2 wt% eq. NaCl). The second stage, which was characterized both by the formation of mode‐I joints and by mode‐I reactivation of pre‐existing veins, shows higher Th and salinities (215–270 °C and 2.2–5.7 wt% eq. NaCl). Waters recorded in the second stage are interpreted to have interacted with underlying Triassic evaporites and flowed along major thrusts before vein precipitation, which are locally in thermal disequilibrium with host‐rocks. We suggest the transition from a rather closed hydrological system during the first stage of vein formation, interpreted to have occurred during Eaux‐chaudes thrusting (upper Lutetian‐Bartonian), to a more open hydrological system during the second stage, which likely occurred during Gavarnie thrusting (Priabonian‐early Rupelian). Finally, we also document the migration in space and time of hydrothermal pulses along the South Pyrenean Foreland Basin, related to the westward propagation of major thrusts during the Pyrenean orogeny.

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/content/journals/10.1111/bre.12249
2017-07-07
2020-08-05
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Th versus Tm diagrams, showing means and standard deviations for each primary and secondary FIA, analysed in extensional (EV) and SV‐EV veins (crack‐seal and blocky zones). Salinity in wt % eq. NaCl.

IMAGE

Detailed location of fracture sites. Analytical techniques used at each site are also reported (vitrinite reflectance from Izquierdo . (2013) and Labaume . (2016)). Report to Fig. 12 to localized microthermometric analyses (R1; R2; H1‐H3; A1‐A3 and B1‐B6).

WORD

Results of isotopic analyses. n: not determined.

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  • Article Type: Research Article
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