Long-term fluid circulation in extensional faults in the central Catalan Coastal Ranges: P-T constraints from neoformed chlorite and K-white mica

Cantarero, Irene; Lanari, Pierre; Vidal, Olivier; Alías, Gemma; Travé, Anna; Baqués, Vinyet
January 2014
International Journal of Earth Sciences;Jan2014, Vol. 103 Issue 1, p165
Academic Journal
The neoformation of chlorite and K-white mica in fault rocks from two main faults of the central Catalan Coastal Ranges, the Vallès and the Hospital faults, has allowed us to constrain the P-T conditions during fault evolution using thermodynamic modeling. Crystallization of M1 and M2 muscovite and microcline occured as result of deuteric alteration during the exhumation of the pluton (290 °C > T > 370 °C) in the Permian. After that, three tectonic events have been distinguished. The first tectonic event, attributed to the Mesozoic rifting, is characterized by precipitation of M3 and M4 phengite together with chlorite and calcite C1 at temperatures between 190 and 310 °C. The second tectonic event attributed to the Paleogene compression has only been identified in the Hospital fault with precipitation of low-temperature calcite C2. The shortcut produced during inversion of the Vallès fault was probably the responsible for the lack of neoformed minerals within this fault. Finally, the third tectonic event, which is related to the Neogene extension, is characterized in the Vallès fault by a new generation of chlorite, associated with calcite C4 and laumontite, formed at temperatures between 125 and 190 °C in the absence of K-white mica. Differently, the Hospital fault is characterized by the precipitation of calcite C3 during the syn-rift stage at temperatures around 150 °C and by low-temperature fluids precipitating calcites C5, C6 and PC1 during the post-rift stage. During the two extensional events (Mesozoic and Neogene), faults acted as conduits for hot fluids producing anomalous high geothermal gradients (50 °C/km minimum).


Related Articles

  • Interesting California Metamorphic Rocks.  // Rocks & Minerals of California;1987, p49 

    The article describes various metamorphic rocks found in California. Chlorite schist is a common and beautiful green rock of Death valley. Its flakes of chlorite do not have the elasticity of the mica flakes in mica. Shistose conglomerate shows the results of extreme pressure. Serpentine is...

  • Timing and conditions of brittle faulting on the Silltal-Brenner Fault Zone, Eastern Alps (Austria). Mancktelow, Neil; Zwingmann, Horst; Campani, Marion; Fügenschuh, Bernhard; Mulch, Andreas // Swiss Journal of Geosciences;Dec2015, Vol. 108 Issue 2/3, p305 

    The Silltal Fault is the northern brittle continuation of the Brenner Fault Zone, marked by a narrow zone of cataclasis and, in three locations, clay-rich fault gouges. The clay mineral composition of these gouges is dominated by higher temperature 2M polytype illite/muscovite, with no 1M/1M...

  • Formation and alteration of plagiogranites in an ultramafic-hosted detachment fault at the Mid-Atlantic Ridge (ODP Leg 209). J�ns, Niels; Bach, Wolfgang; Schroeder, Timothy // Contributions to Mineralogy & Petrology;May2009, Vol. 157 Issue 5, p625 

    We examined small-scale shear zones in drillcore samples of abyssal peridotites from the Mid-Atlantic Ridge. These shear zones are associated with veins consisting of chlorite + actinolite/tremolite assemblages, with accessory phases zircon and apatite, and they are interpreted as altered...

  • Formation of chlorite during thrust fault reactivation. Record of fluid origin and P-T conditions in the Monte Perdido thrust fault (southern Pyrenees). Lacroix, B.; Charpentier, D.; Buatier, M.; Vennemann, T.; Labaume, P.; Adatte, T.; Travé, A.; Dubois, M. // Contributions to Mineralogy & Petrology;Jun2012, Vol. 163 Issue 6, p1083 

    The chemical and isotopic compositions of clay minerals such as illite and chlorite are commonly used to quantify diagenetic and low-grade metamorphic conditions, an approach that is also used in the present study of the Monte Perdido thrust fault from the South Pyrenean fold-and-thrust belt....

  • Analysis of fault populations in western Spitsbergen: Implications for deformation partitioning... Teyssier, Christian; Kleinspehn, Karen // Geological Society of America Bulletin;Jan95, Vol. 107 Issue 1, p68 

    Analyzes the orientations of mesoscale faults in a sedimentary basin relative to an adjacent paleo-transform margin and to infer paleostress tensors and their chronology from fault-slip data. Application of paleostress stratigraphy to the Paleogene Central basin of Spitsbergen; Geologic context...

  • Ammonium vermiculite in schists from the Betic Cordillera (Spain). Cruz, M. D. Ruiz // American Mineralogist;Nov2011, Vol. 96 Issue 11, p1703 

    NH4-bearing phases from pre-Permian schists of the Internal Zones of the Betic Cordillera (Spain) have been characterized by X-ray diffraction, differential thermal analysis and thermogravimetry, infrared spectroscopy, and transmission-analytical electron microscopy. The content and distribution...

  • Analysis of Palaeogene strike-slip tectonics along the southern East Greenland margin (Sødalen area). Guarnieri, Pierpaolo // Geological Survey of Denmark & Greenland Bulletin;2011, Issue 23, p65 

    The article presents an analysis of Palaeogene strike-slip tectonics based on structural data collected from Sødalen in southern East Greenland. It details the geological setting, the Sødalen region, and the structural data. Kinematic analysis and Palaeostress analysis of the heterogeneous...

  • Influence of Late Cretaceous magmatism on the Sevier orogenic wedge, western Montana. Lageson, David R.; Schmitt, James G.; Horton, Brian K.; Kalakay, Thomas J.; Burton, Bradford R. // Geology;Aug2001, Vol. 29 Issue 8, p723 

    Determines the geometric and kinematic development of the thrust wedge in Montana. Late Cretaceous-Paleogene magma framework; Implications of thrust wedge internal thickening in retroarc thrust belts; Estimates of batholith thickness; Emplacement of the Boulder batholith.

  • Faulting structure styles and their depositional filling response of the Paleogene margin of Shaleitian uplift, western Bohal Sea area. Kang Hai-liang; Lin Chang-song; Niu Cheng-min; Ye Dong-qing; Zhuang Xing-yan // Natural Gas Geoscience;Feb2017, Vol. 28 Issue 2, p1 

    The NW-trending pre-existing faults and the NE-trending early faults controlled the structural evolution of the Shaleitian uplift margin. According to the characteristics of the main faults, the combination of the main faults, the early synsedimentary faults and the companion faults, Shaleitian...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics