From early contraction to post-folding fluid evolution in the frontal part of the Bóixols thrust sheet (Southern Pyrenees) as revealed by the texture and geochemistry of calcite cements

Nicholas Nardini, Daniel Muñoz-López (Corresponding Author), David Cruset, Irene Cantarero, Juan Diego Martín-Martín, Antonio Benedicto, Enrique Gomez Rivas, Cédric M. John, Anna Travé

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Abstract

Structural, petrological and geochemical (δ13C, δ18O, clumped isotopes, 87Sr/86Sr and ICP-MS) analyses of fracture-related calcite cements and host rocks are used to establish a fluid-flow evolution model for the frontal part of the Bóixols thrust sheet (Southern Pyrenees). Five fracture events associated with the growth of the thrust-related Bóixols anticline and Coll de Nargó syncline during the Alpine orogeny are distinguished. These fractures were cemented with four generations of calcite cements, revealing that such structures allowed the migration of different marine and meteoric fluids through time. During the early contraction stage, Lower Cretaceous seawater circulated and precipitated calcite cement Cc1, whereas during the main folding stage, the system opened to meteoric waters, which mixed with the connate seawater and precipitated calcite cement Cc2. Afterwards, during the post-folding stages, connate evaporated marine fluids circulated through newly formed NW-SE and NE-SW conjugate fractures and later through strike-slip faults and precipitated calcite cements Cc3 and Cc4. The overall paragenetic sequence reveals the progressive dewatering of Cretaceous marine host sediments during progressive burial, deformation and fold tightening and the input of meteoric waters only during the main folding stage. This study illustrates the changes of fracture systems and the associated fluid-flow regimes during the evolution of fault-associated folds during orogenic growth.
Original languageEnglish
Article number117
Pages (from-to)117
Number of pages29
JournalMinerals
Volume9
Issue number2
DOIs
Publication statusPublished - 16 Feb 2019

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Geochemistry
Calcite
contraction
folding
Cements
cement
calcite
thrust
Textures
texture
geochemistry
Fluids
fluid
meteoric water
Seawater
fluid flow
Flow of fluids
Strike-slip faults
fold
Cretaceous

Keywords

  • geochemistry of calcite cements
  • meteoric and marine fluids
  • fractures
  • Bóixols thrust sheet
  • southern Pyrenees
  • Boixols thrust sheet
  • FORELAND BASIN
  • FLOW
  • JABAL QUSAYBAH ANTICLINE
  • CLUMPED ISOTOPE
  • GROWTH
  • RARE-EARTH-ELEMENTS
  • BELT ALBANIA
  • SYSTEMS
  • FAULT
  • PORE WATERS

Cite this

From early contraction to post-folding fluid evolution in the frontal part of the Bóixols thrust sheet (Southern Pyrenees) as revealed by the texture and geochemistry of calcite cements. / Nardini, Nicholas; Muñoz-López, Daniel (Corresponding Author); Cruset, David; Cantarero, Irene; Martín-Martín, Juan Diego; Benedicto, Antonio; Gomez Rivas, Enrique; John, Cédric M.; Travé, Anna.

In: Minerals, Vol. 9, No. 2, 117, 16.02.2019, p. 117.

Research output: Contribution to journalArticle

Nardini, Nicholas ; Muñoz-López, Daniel ; Cruset, David ; Cantarero, Irene ; Martín-Martín, Juan Diego ; Benedicto, Antonio ; Gomez Rivas, Enrique ; John, Cédric M. ; Travé, Anna. / From early contraction to post-folding fluid evolution in the frontal part of the Bóixols thrust sheet (Southern Pyrenees) as revealed by the texture and geochemistry of calcite cements. In: Minerals. 2019 ; Vol. 9, No. 2. pp. 117.
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title = "From early contraction to post-folding fluid evolution in the frontal part of the B{\'o}ixols thrust sheet (Southern Pyrenees) as revealed by the texture and geochemistry of calcite cements",
abstract = "Structural, petrological and geochemical (δ13C, δ18O, clumped isotopes, 87Sr/86Sr and ICP-MS) analyses of fracture-related calcite cements and host rocks are used to establish a fluid-flow evolution model for the frontal part of the B{\'o}ixols thrust sheet (Southern Pyrenees). Five fracture events associated with the growth of the thrust-related B{\'o}ixols anticline and Coll de Narg{\'o} syncline during the Alpine orogeny are distinguished. These fractures were cemented with four generations of calcite cements, revealing that such structures allowed the migration of different marine and meteoric fluids through time. During the early contraction stage, Lower Cretaceous seawater circulated and precipitated calcite cement Cc1, whereas during the main folding stage, the system opened to meteoric waters, which mixed with the connate seawater and precipitated calcite cement Cc2. Afterwards, during the post-folding stages, connate evaporated marine fluids circulated through newly formed NW-SE and NE-SW conjugate fractures and later through strike-slip faults and precipitated calcite cements Cc3 and Cc4. The overall paragenetic sequence reveals the progressive dewatering of Cretaceous marine host sediments during progressive burial, deformation and fold tightening and the input of meteoric waters only during the main folding stage. This study illustrates the changes of fracture systems and the associated fluid-flow regimes during the evolution of fault-associated folds during orogenic growth.",
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author = "Nicholas Nardini and Daniel Mu{\~n}oz-L{\'o}pez and David Cruset and Irene Cantarero and Mart{\'i}n-Mart{\'i}n, {Juan Diego} and Antonio Benedicto and {Gomez Rivas}, Enrique and John, {C{\'e}dric M.} and Anna Trav{\'e}",
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AU - Nardini, Nicholas

AU - Muñoz-López, Daniel

AU - Cruset, David

AU - Cantarero, Irene

AU - Martín-Martín, Juan Diego

AU - Benedicto, Antonio

AU - Gomez Rivas, Enrique

AU - John, Cédric M.

AU - Travé, Anna

N1 - Funding: This research was carried out within the framework of DGICYT Spanish Project CGL2015-66335-C2-1-R and the Grup Consolidat de Recerca “Geologia Sedimentària” (2017-SGR- 824). Acknowledgments: We thank three anonymous referees for their constructive reviews, which helped to improve the quality of the manuscript, together with the editorial guidance of Hairuo Qing. Carbon and oxygen isotopic analyses were performed at “Centre Científics I Tecnològics” of the Universitat de Barcelona. Strontium analyses were carried out at the “CAI de Geocronología y Geoquímica Isotópica (UCM-CEI)” of the Universidad Complutense de Madrid. The clumpled isotope analyses were done in the Qatar Stable isotope Laboratory of Imperial College of London. Elemental and REE composition analyses were performed at the Geochemistry Facility of labGEOTOP of the Institute of Earth Sciences Jaume Almera (ICTJA-CSIC), a cofounded structure by FEDER-UE (Ref. CSIC08-4E-001). EGR acknowledges the support of the Beatriu de Pinós programme of the Government of Catalonia’s Secretariat for Universities and Research of the Department of Economy and Knowledge (2016 BP 00208).

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N2 - Structural, petrological and geochemical (δ13C, δ18O, clumped isotopes, 87Sr/86Sr and ICP-MS) analyses of fracture-related calcite cements and host rocks are used to establish a fluid-flow evolution model for the frontal part of the Bóixols thrust sheet (Southern Pyrenees). Five fracture events associated with the growth of the thrust-related Bóixols anticline and Coll de Nargó syncline during the Alpine orogeny are distinguished. These fractures were cemented with four generations of calcite cements, revealing that such structures allowed the migration of different marine and meteoric fluids through time. During the early contraction stage, Lower Cretaceous seawater circulated and precipitated calcite cement Cc1, whereas during the main folding stage, the system opened to meteoric waters, which mixed with the connate seawater and precipitated calcite cement Cc2. Afterwards, during the post-folding stages, connate evaporated marine fluids circulated through newly formed NW-SE and NE-SW conjugate fractures and later through strike-slip faults and precipitated calcite cements Cc3 and Cc4. The overall paragenetic sequence reveals the progressive dewatering of Cretaceous marine host sediments during progressive burial, deformation and fold tightening and the input of meteoric waters only during the main folding stage. This study illustrates the changes of fracture systems and the associated fluid-flow regimes during the evolution of fault-associated folds during orogenic growth.

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KW - geochemistry of calcite cements

KW - meteoric and marine fluids

KW - fractures

KW - Bóixols thrust sheet

KW - southern Pyrenees

KW - Boixols thrust sheet

KW - FORELAND BASIN

KW - FLOW

KW - JABAL QUSAYBAH ANTICLINE

KW - CLUMPED ISOTOPE

KW - GROWTH

KW - RARE-EARTH-ELEMENTS

KW - BELT ALBANIA

KW - SYSTEMS

KW - FAULT

KW - PORE WATERS

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JO - Minerals

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