the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Jurassic–cretaceous deformational phases in the Paraná intracratonic basin, southern Brazil
A. J. Strieder
R. Heemann
P. A. R. Reginato
R. B. Acauan
V. A. de Amorim
M. Z. Remde
Abstract. This paper examines the domes and basins, regional arcs and synclines, and brittle structures of the Paraná Basin flood volcanism to characterize the deformational phases in its Jurassic to Cretaceous history. First-stage fieldwork revealed brittle structures, extensional joints, and strike-slip faults, and second-stage fieldwork investigated the connections of the brittle structures to both open folds and dome-and-basin features. Fault-slip data inversion was performed using two different techniques to distinguish local and remote stress/strain. Geometric and kinematic analyses completed the investigations of the deformation, which characterized two deformational phases for the Jurassic to Cretaceous periods in the Paraná Basin. Both developed under regional bi-directional constrictional (σ1 ≥ σ2 ≫ σ3) stress regimes that produced a number of non-cylindrical folds. A D1 deformational phase produced the N–S and E–W orthogonally oriented domes and basins. The D2 arcs and synclines are oriented towards the NW and NE and indicate a clockwise rotation (35–40°) of both horizontal principal stress tensors. The extensional joints and strike-slip faults characterize the local stress field in the outer rim of the orthogonally buckled single volcanic flow, whereas the inner rim of the buckled single flow supported constriction and thus, developed the local arcuate folds.
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A. J. Strieder et al.
Interactive discussion


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RC C514: 'Comments on ms', Anonymous Referee #1, 23 Apr 2015
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AC C677: 'Authors comments to Referee 1 suggestions', Adelir José STRIEDER, 19 May 2015
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AC C677: 'Authors comments to Referee 1 suggestions', Adelir José STRIEDER, 19 May 2015
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RC C557: 'revision', Anonymous Referee #2, 29 Apr 2015
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EC C699: 'Editor comment', Federico Rossetti, 24 May 2015
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AC C804: 'Interactive comments to Topic Editor on', Adelir José STRIEDER, 19 Jun 2015
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AC C804: 'Interactive comments to Topic Editor on', Adelir José STRIEDER, 19 Jun 2015
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EC C807: 'editor comment to the letter of Dr. Strieder', Federico Rossetti, 19 Jun 2015
Interactive discussion


-
RC C514: 'Comments on ms', Anonymous Referee #1, 23 Apr 2015
-
AC C677: 'Authors comments to Referee 1 suggestions', Adelir José STRIEDER, 19 May 2015
-
AC C677: 'Authors comments to Referee 1 suggestions', Adelir José STRIEDER, 19 May 2015
-
RC C557: 'revision', Anonymous Referee #2, 29 Apr 2015
-
EC C699: 'Editor comment', Federico Rossetti, 24 May 2015
-
AC C804: 'Interactive comments to Topic Editor on', Adelir José STRIEDER, 19 Jun 2015
-
AC C804: 'Interactive comments to Topic Editor on', Adelir José STRIEDER, 19 Jun 2015
-
EC C807: 'editor comment to the letter of Dr. Strieder', Federico Rossetti, 19 Jun 2015
A. J. Strieder et al.
A. J. Strieder et al.
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