Contemporary stress orientations in the Andean retroarc between 34°S and 39°S from borehole breakout analysis

Guzmán, C.; Cristallini, Ernesto Osvaldo; Bottesi, Germán

doi:10.1029/2006tc001958

Cited by 45 publications

(49 citation statements)

References 36 publications

(54 reference statements)

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“…Similar regional stress field analysis has also been conducted in the Alberta and Neuquen Basins, foreland basins of the Rockies and Andes respectively, and both reveal orientations that are consistently perpendicular to the strike of the topographic front (Bell, 1996;Guzmán et al, 2007;Guzmán and Cristallini, 2009). The orientations observed in the Alberta and Neuquen Basins, and in the southwest part of the Molasse Basin, are consistent with absolute plate motion and thus have been used to suggest that plate boundary forces, rather than gravitational forces, control the orientation in these foreland areas (Richardson, 1992;Zoback, 1992;Gölke and Coblentz, 1996;Guzmán et al, 2007;Guzmán and Cristallini, 2009). However, the strike of the topographic front is largely perpendicular to the direction of relative plate motion in the Alberta, Neuquen, Cuya and southwest Molasse Basins, and thus both topographic body forces and plate boundary forces may be expected to yield similar orientations.…”

Section: Implications For Other Foreland Basinsmentioning

confidence: 58%

Present-day stress orientation in the Molasse Basin

et al. 2010

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Section: Implications For Other Foreland Basinsmentioning

confidence: 58%

Present-day stress orientation in the Molasse Basin

et al. 2010

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“…For this sector of the Andean retroarc, the SHmax orientation may be controlled by both, the convergence vector between the Nazca and South American plates (azimuth 080°) [Angermann et al, 1999;Norabuena et al, 1999;Kendrick et al, 2003;Guzmán et al, 2007], the direction of the ridge push (E-W) and the topographic forces (in general E -W, just perpendicular to the main topography axis). All of these forces are acting approximately with an E-W orientation in this segment of the South American Plate [Coblentz and Richardson, 1996;Meijer et al, 1997]; consequently, the expected SHmax orientation should be approximately parallel to them.…”

Section: Interpretation and Discussionmentioning

confidence: 99%

“…The SHmax direction is almost perpendicular to the topography. Guzmán et al [2007] proposed two possible explanations for the stress field orientation in the Neuquén Basin, suggesting that either the topographic forces exert an important control on the stress field, or that ancient structural indenters (rigid block moving eastward) are controlling the horizontal stress field. The first hypothesis has been previously mentioned by other authors [Coblentz and Richardson, 1996;Meijer et al, 1997] and the SHmax results obtained in this paper are coherent with them.…”

Section: Interpretation and Discussionmentioning

confidence: 99%

“…The data obtained in this paper and in the paper of Guzmán et al [2007] represent a very important contribution to the stress field picture of South America.…”

Section: Discussionmentioning

confidence: 99%

“…Recently, Guzmán et al [2007] published a large number of horizontal stress data calculated from borehole breakout information from Neuquén Basin, in the Andean foreland of Argentina.…”

Section: Introductionmentioning

confidence: 99%

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Contemporary stress orientations from borehole breakout analysis in the southernmost flat‐slab boundary Andean retroarc (32°44′ and 33°40′S)

Guzmán

Cristallini

2009

J. Geophys. Res.

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Horizontal stress directions have been determined in the southernmost flat‐slab boundary Andean retroarc between 32°44′ and 33°40′S within Cuyo Basin, Argentina. These directions were obtained from the borehole breakout analysis of 42 wells using four‐arm caliper data. The mean maximum horizontal stress (SHmax) direction for the whole region is 104.1° with a 95% confidence interval of 8.1°. The present‐day stress field has an approximately preferred E–W trend maximum horizontal stress direction, consistent with the plate boundary forces (80°) and the topographic forces (near E–W). The calculated SHmax directions are near the expected values, but some local deviations were observed. The SHmax rotates from an E–W orientation in the south to a NW–SE orientation to the north of this sector of the Andean retroarc. A regional variation in the stress field can be observed when these results for the Cuyo Basin are analyzed together with those presented in a previous study in the Neuquén Basin to the south. The maximum horizontal stress varies from ∼NW–NE along this combined section of the Andean retroarc, with the ∼E–W SHmax directions in the northern Neuquén Basin consistent with those observed in the southern sector of Cuyo Basin. These variations in the stress field orientation appear related with the topography geometry. From the analysis between the mean SHmax obtained and the acting forces, it can be concluded that the topographic control on the horizontal stress field seems to be dominant in the Cuyo Basin and in the north of Neuquén Basin. To the south of Neuquén Basin the horizontal stress field should be mainly controlled by the plate boundary forces.

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Tectonic Regimes of the Central and Southern Andes: Responses to Variations in Plate Coupling During Subduction

2018

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Construction of the Andes has been governed largely by fluctuating contractional, neutral, and extensional tectonic regimes during differing degrees of mechanical coupling along the convergent plate boundary. These three contrasting regimes are likely regulated by geodynamic variations in absolute trenchward motion of South America and episodic regional shifts in the geometry of the subducting oceanic slab. Alternations among these three modes are revealed in syntheses of Mesozoic‐Cenozoic crustal deformation, basin evolution, and arc magmatism along orogen‐perpendicular transects across the central and southern Andes at 23°S, 35°S, and 43°S. Despite considerable along‐strike dissimilarities in the magnitude of deformation, a comparable tectonic regime typified the early Andean history, as defined by a transition from Late Jurassic‐Early Cretaceous postrift thermal subsidence to Late Cretaceous retroarc shortening. A key contradiction is expressed for the late middle Eocene to earliest Miocene, when neutral to extensional conditions affected retroarc to forearc regions, except in parts of the central Andes, which experienced retroarc shortening with only localized forearc extension. This mixed‐mode scenario during Paleogene time may reflect decoupling along the plate boundary (possibly during slab rollback within a retreating subduction system) in which widespread stasis or low‐magnitude extension dominated the southern Andes but was inhibited in the strongly shortened central Andes at 15–25°S where shallow subduction and/or high topography boosted plate coupling. Comparable temporal and spatial shifts in tectonic regime along the Andes and other convergent margins can be related to variable degrees of coupling during first‐order plate‐scale changes in convergence and second‐order regional cycles of slab shallowing and steepening.

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Contemporary stress orientations in the Andean retroarc between 34°S and 39°S from borehole breakout analysis

Cited by 45 publications

References 36 publications

Present-day stress orientation in the Molasse Basin

Present-day stress orientation in the Molasse Basin

Contemporary stress orientations from borehole breakout analysis in the southernmost flat‐slab boundary Andean retroarc (32°44′ and 33°40′S)

Tectonic Regimes of the Central and Southern Andes: Responses to Variations in Plate Coupling During Subduction

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