Peritidal Carbonate–Evaporite Sedimentation Coeval to Normal Fault Segmentation During the Triassic–Jurassic Transition, Iberian Chain

  1. Gary Nichols,
  2. Ed Williams and
  3. Chris Paola
  1. Marc Aurell1,
  2. Beatriz Bádenas1,
  3. Antonio M. Casas1 and
  4. Ramón Salas2

Published Online: 30 MAR 2009

DOI: 10.1002/9781444304411.ch10

Sedimentary Processes, Environments and Basins: A Tribute to Peter Friend

Sedimentary Processes, Environments and Basins: A Tribute to Peter Friend

How to Cite

Aurell, M., Bádenas, B., Casas, A. M. and Salas, R. (2007) Peritidal Carbonate–Evaporite Sedimentation Coeval to Normal Fault Segmentation During the Triassic–Jurassic Transition, Iberian Chain, in Sedimentary Processes, Environments and Basins: A Tribute to Peter Friend (eds G. Nichols, E. Williams and C. Paola), Blackwell Publishing Ltd., Oxford, UK. doi: 10.1002/9781444304411.ch10

Author Information

  1. 1

    Departamento Ciencias de la Tierra, Universidad Zaragoza, 50.009 Zaragoza, Spain

  2. 2

    Departament GPPG, Universitat Barcelona, 08.028 Barcelona, Spain

Publication History

  1. Published Online: 30 MAR 2009
  2. Published Print: 7 DEC 2007

Book Series:

  1. Special Publication Number 38 of the International Association of Sedimentologists

Book Series Editors:

  1. Ian Jarvis

Series Editor Information

  1. School of Earth Sciences & Geography, Centre for Earth & Environmental Science Research, Kingston University, Penrhyn Road, Kingston upon Thames KT1 2EE, UK

ISBN Information

Print ISBN: 9781405179225

Online ISBN: 9781444304411

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Keywords:

  • peritidal carbonate–evaporite sedimentation coeval to normal fault segmentation during Triassic–Jurassic transition, Iberian chain;
  • palaeogeographical remarks and stratigraphy;
  • Iberian chain peritidal carbonate–evaporite sedimentation;
  • grain-supported limestones;
  • oolitic and bioclastic wackestones–packstones;
  • normal faults, fractures and slump folds;
  • tectono-sedimentary evolution

Summary

Around the Triassic–Jurassic transition, a major tectonic rifting phase affected the northern part of the Iberian Basin (northeast Spain). Extensive normal faulting resulted in basin segmentation, as reflected by the rapid thickness and facies variation of the syn-rift, shallow-marine to supratidal carbonate–evaporite units. The upper Rhaetian–Hettangian syn-rift units exposed around the locality of Morata de Jalón (northeast Spain) provide good exposures that enable a precise sedimentological and structural analysis. The study of these units was achieved through geological mapping of an area of 10 km2, facies characterization, correlation of seven selected logs (vertical thickness from 40 m to 135 m), and measurement of normal faults, fractures and slump folds. The orientation of the major syn-sedimentary normal faults (NW–SE to NNW–SSE) suggests an origin through reactivation of late Variscan faults located within the Palaeozoic basement. However, the orientation of the newly formed faults and joints indicates a main N–S extension direction. The tectono-sedimentary evolution of the studied basin can be summarized in two stages:

1 at the end of the Triassic, a subsiding salina formed in the downthrown blocks of two normal faults – salina deposits were sourced from marine waters and, also probably, from the weathering of previously deposited evaporite-rich units;

2 during the Hettangian, tectonic reactivation combined with the long-term regional sea-level rise resulted in the formation of a tidal flat complex.

These graded, in the areas of greater subsidence, into shallow-marine carbonate platform deposits. Syn-sedimentary fracturing affected the early lithified carbonates, favouring the formation of collapse-breccias in the tidal-flat environment, and limestone rudites (sedimentary breccias and conglomerates) in the subtidal domain, formed and partly transported as submarine debris flows.