Rotation velocity of a thrust: a paleomagnetic study in the External Sierras (Southern Pyrenees)

Pueyo, Emilio L.; Millán, H.; Pocoví, A.

doi:10.1016/s0037-0738(01)00172-5

Cited by 69 publications

(69 citation statements)

References 23 publications

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“…The average NRM intensity is moderate (0.181 mA/m) ( Figure 5) similar to that observed by the previous paleomagnetic studies of the Arguis Formation [Pueyo, 2000;Pueyo et al, 2002]. During thermal demagnetization a relatively low unblocking temperature overprint is usually present in most of the Arguis samples.…”

Section: Magnetostratigraphysupporting

confidence: 86%

“…[8] The Arguis Formation is greater than 800 m thick in the Arguis syncline (Figure 1) [Puigdefabregas, 1975;Millan et al, 1994;Castelltort et al, 2003;Hogan, 1993;Pueyo et al, 2002;Newton, 2006]. The ARM cyclostratigraphy reported here was developed for nearly all of the Arguis Formation (Figure 2).…”

Section: Arguis Formation In the Arguis Synclinementioning

confidence: 95%

“…The upper boundary of the Arguis is a gradational contact with the coarse-grained shallow marine deltaic sandstone of the Belsue-Atares Formation [Puigdefabregas, 1975;Millan et al, 1994]. A latest Lutitian to early Priabonian age of the Arguis Formation is supported by multispecies biostratigraphy [Canudo, 1990;Canudo et al, 1991] and magnetostratigraphy [Hogan, 1993;Pueyo et al, 2002;Pares et al, 2006]. Biostratigraphy suggests that the Arguis Formation spans from nanoplankton (NP) zone NP16 to NP17 and planktonic foraminifera (P) zone P12 to P15 [Canudo et al, 1991].…”

Section: Arguis Formation In the Arguis Synclinementioning

confidence: 99%

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High‐resolution rock magnetic cyclostratigraphy in an Eocene flysch, Spanish Pyrenees

Kodama

Anastasio

Newton

et al. 2010

Geochem Geophys Geosyst

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[1] A rock magnetic cyclostratigraphy, based on anhysteretic remanent magnetization (ARM) intensity variations, was developed for the Eocene Arguis Formation in the Spanish Pyrenees. The Arguis Formation was sampled for ARM cyclostratigraphy, rock magnetic, and paleomagnetic analyses. Rock magnetic measurements indicate that the dominant magnetic mineral controlling the ARM cyclostratigraphy is depositional magnetite. Using thermal demagnetization, a detailed magnetostratigraphy was developed for the Arguis to provide an absolute time framework for the ARM cyclostratigraphy. The magnetostratigraphy is carried by a combination of depositional magnetite and secondary iron sulfides. Spectral analysis of the magnetostratigraphically scaled ARM time series reveals the presence of significant Milankovitch frequencies including eccentricity, obliquity, and precession. The ARM time series was tuned to the orbital eccentricity model for the Eocene. Coherency analysis indicates that the eccentricity-tuned ARM is in phase with October-November insolation for this site's paleolatitude. Varying amounts of terrigenous input delivered by a fluvial source at orbital time scales, during the rainy season, and diluted by a relatively constant input of marine carbonate is the most likely explanation for the cyclicity of the ARM record. The absolute age resolution of the ARM chronostratigraphy is 1% or less based on an age offset with the reference chronology that was used for the Eocene. The offset in age between the two chronologies may be due, in part, to the uncertainty in the chron ages for this part of the Eocene. The relative age resolution within the ARM chronostratigraphy is much better.

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Section: Magnetostratigraphysupporting

confidence: 86%

Section: Arguis Formation In the Arguis Synclinementioning

confidence: 95%

Section: Arguis Formation In the Arguis Synclinementioning

confidence: 99%

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High‐resolution rock magnetic cyclostratigraphy in an Eocene flysch, Spanish Pyrenees

Kodama

Anastasio

Newton

et al. 2010

Geochem Geophys Geosyst

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“…However, despite this similarity in the paleo-water depth evolution during the Lutetian, the absolute depth is not the same at each locality for the same age. The explanation could be found in the progressive tectonic transport above an~south-directed ramp over the foreland sedimentary series and the clockwise rotation of this area since the Bartonian (Pueyo et al, 2002;Huyghe et al, 2009). As a consequence, the repartition of the studied outcrops during the Lutetian was not the same as today and their relative disposition, that is currently an east-west alignment, was different during the Lutetian and thus not parallel to the paleo-coastline due to the post Lutetian clockwise rotation of the studied area.…”

Section: Biostratigraphy and Correlation Between The Studied Sectionsmentioning

confidence: 99%

“…The Sierras Exteriores comprise several folds of wavelength of several kilometres which are oblique to the main orogen strike as a result of their progressive clockwise rotation due to far-field differential movements along the Mediano-Boltaña lateral ramp (Séguret, 1972;Millán et al, 1995;Pueyo et al, 2002;Huyghe et al, 2009). Thus, the west to east trending distribution of the Guara paleoenvironments along the South-Pyrenean front actually reflects a succession of paleoenvironments that trended southwest-northeast, i.e.…”

Section: Geological Settingmentioning

confidence: 99%

Large scale facies change in the middle Eocene South-Pyrenean foreland basin: The role of tectonics and prelude to Cenozoic ice-ages

Huyghe¹,

Castelltort²,

Mouthereau³

et al. 2012

Sedimentary Geology

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The present study reports a sedimentological analysis of the Guara Limestone Formation deposited during the Lutetian in the Sierras Exteriores, in the South-Pyrenean foreland basin. We provide a detailed facies analysis of the carbonates to precise the paleoenvironmental context during their deposition. We show that those limestones are mainly composed of shallow-water foraminifers and were deposited in relative shallow-water environments (b120 m) during the whole Lutetian (SBZ 13 to SBZ 16). The Guara Limestone Formation represents the last occurrence of carbonate platform in the South-Pyrenean foreland basin and disappeared definitely at the Lutetian to Bartonian transition. The demise of carbonate producers at the end of the Lutetian could be related to an increase of continental erosion, due to tectonic and/or climatic forcing. We illustrate that in the Jaca basin, this event correlates with a marked increase in subsidence rate. However, this deformation event is local and the carbonate systems in the Pyrenean foreland resisted to many deformation events during the whole basin history before. Paleobathymetric reconstructions in the Jaca basin, where shallow marine sections outcrop, suggest an increase of the amplitude of high-frequency sea-level cycles. This increase is contemporaneous with several climatic evidences, which suggest the appearance of early ice-sheets near the Lutetian-Bartonian boundary. The demise of carbonate producers seems, therefore, to be the result of a major environmental shift in the basin accompanying increased subsidence rates, switching from low nutrient oligotrophic conditions -favourable for shallow water benthic foraminifers -to eutrophic conditions due to the increase of erosion and terrigenous nutrient input associated with higher-frequency sea-level changes and river destabilization.

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Tectonic magnetic lineation and oroclinal bending of the Alborz range: Implications on the Iran-Southern Caspian geodynamics

et al. 2015

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In this study we use the anisotropy of magnetic susceptibility (AMS) and paleomagnetic data for deciphering the origin of magnetic lineation in weakly deformed sedimentary rocks and for evaluating oroclinal processes within the Arabia-Eurasia collision zone. In particular, we have analyzed the Miocene Upper Red Formation (URF) from the outer curved front of the southern Central Alborz Mountains of north Iran, to test for the first time with paleomagnetic data the origin (primary versus secondary) of this orogenic arc. AMS data document the existence of a magnetic lineation parallel to the orientation of the major tectonic structures, which vary along strike from WNW to ENE. These directions are highly oblique to the paleoflow directions and hence suggest that the magnetic lineation in the URF was produced by compressional deformation during layer-parallel shortening. In addition, our paleomagnetic data document clockwise and anticlockwise rotations along vertical axis for the western and eastern sectors of the Central Alborz Mountains, respectively. Combined, our results suggest that the orogen represents an orocline, which formed not earlier than circa 7.6 Ma most likely through bending processes caused by the relative motion between the rigid crustal blocks of the collision zone. Moreover, our study provides new insights into the Iran-Southern Caspian Basin kinematic evolution suggesting that the present-day SW motion of the South Caspian Basin with respect to Central Iran postdates oroclinal bending and hence cannot be as old as late Miocene to early Pliocene but a rather recent configuration (i.e., 3 to <1 Ma).

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Rotation velocity of a thrust: a paleomagnetic study in the External Sierras (Southern Pyrenees)

Cited by 69 publications

References 23 publications

High‐resolution rock magnetic cyclostratigraphy in an Eocene flysch, Spanish Pyrenees

High‐resolution rock magnetic cyclostratigraphy in an Eocene flysch, Spanish Pyrenees

Large scale facies change in the middle Eocene South-Pyrenean foreland basin: The role of tectonics and prelude to Cenozoic ice-ages

Tectonic magnetic lineation and oroclinal bending of the Alborz range: Implications on the Iran-Southern Caspian geodynamics

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