Structural Geology of the NW Neuquina Basin

Kozlowski, Estanislao

doi:10.3997/2214-4609-pdb.115.001eng

Cited by 1 publication

(1 citation statement)

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“…In contrast, the southern segment (Agrio fold belt) is characterized by smaller NNW trending structures where the basement is incipiently involved. Traditionally, the participation of the Permo‐Triassic volcaniclastic basement (Choiyoi Group) in the deformation is explained as a Cretaceous‐Tertiary tectonic inversion of Triassic extensional half graben faults [ Kozlowski et al , 1990, 1993; Viñes , 1990; Kozlowski , 1991; Manceda and Figueroa , 1995; Ramos et al , 1996; Ramos , 1998; Zapata et al , 1999]. However, some authors state that the basement is involved by low‐angle thrust faults not related with the original normal faults [ Ploszkiewicz , 1987; Yagupsky et al , 2007].…”

Section: Tectonic Settingmentioning

confidence: 99%

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

Guzmán

Cristallini²,

Bottesi³

2007

Tectonics

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[1] In this paper we present the results of the analysis of borehole breakouts from 115 wells drilled within Neuquén Basin in the Andean retroarc between 34°a nd 39°S (Argentina). The first-order present-day stress orientation in the Andean retroarc is expected to be mainly controlled by the plate boundary forces (azimuth 80°) and the topographic forces (E-W). The obtained maximum horizontal stress (SH max ) has a preferred trend with a resultant direction of azimuth 88.7°and a 95% confidence interval of 13.3°c onsistent with the expected trend. The horizontal stress trajectory map achieved for this region shows that the SH max along the study area is not completely uniform. To the north of Colorado River, the SH max shows an ESE tendency interpreted as significant influenced by the topographic forces. To the south of Colorado River, SH max has an ENE trend similar to the expected based on plate boundary forces. To the southeast of the region, a NE direction was found, probably showing a basement structural control in the stress field geometry. The stress orientations obtained for the whole region show that plate boundary forces, drag basal, and topographic forces are strongly controlling the stress direction distribution.Citation: Guzmán, C., E. Cristallini, and G. Bottesi (2007), Contemporary stress orientations in the Andean retroarc between 34°S and 39°S from borehole breakout analysis, Tectonics, 26, TC3016,

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Section: Tectonic Settingmentioning

confidence: 99%