Magnetostratigraphy and rock magnetism of the Ilerdian stratotype at Tremp, Spain

Pascual, J. O.; Parés, J. M.; Langereis, C.G.; Zijderveld, J.D.A.

doi:10.1016/0031-9201(92)90005-g

Cited by 13 publications

(3 citation statements)

References 24 publications

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“…After tilt correction, the inclination steepens so that it is closer to the expected Eocene inclination (Figure 8d) (Table 2). Other Tertiary limestone formations in the Pyrenees have been shown to record dual polarity magnetizations that allowed retrieval of magnetostratigraphic data [ Pascual et al , 1992; Pujalte et al , 1995]. These observations suggest that the ChRM in the Eocene limestones is a primary direction.…”

Section: Paleomagnetismmentioning

confidence: 69%

Paleomagnetic, structural, and stratigraphic constraints on transverse fault kinematics during basin inversion: The Pamplona Fault (Pyrenees, north Spain)

et al. 2003

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The Pamplona Fault in the Pyrenees is a major transverse structure that has been classically interpreted as a strike‐slip fault. However, lack of consensus concerning the sense of movement casts doubt on its actual kinematics and, as a consequence, its role in the Cenozoic evolution of the Pyrenees remains controversial. In order to assess its kinematics, we have conducted a paleomagnetic, structural, and stratigraphic study focused on the Mesozoic and Tertiary sedimentary rocks that outcrop around the southern segment of the fault. Restoration of balanced cross sections allows us to examine the present‐day spatial relationship of the sedimentary sequences on both sides of the fault and to reconstruct the geometry of the extensional basins formed during Mesozoic rifting episodes in the Bay of Biscay and Pyrenean domains. Paleomagnetic results indicate that no significant tectonic rotations occurred around the fault during Tertiary inversion of the Pyrenees. The lack of tectonic rotations and revaluation of previous hypotheses argues against a strike‐slip movement of the fault. We propose a new model in which the Pamplona Fault is treated as a large‐scale “hanging wall drop” fault whose kinematics was determined by variations in the geometry and thickness of Mesozoic sequences on both sides of the fault. These variations influenced the geometry of the thrust sheet developed during Tertiary compression. We are unaware of any other transverse fault that has been interpreted in this fashion; thus the Pamplona Fault serves as a case study for the evolution of transverse faults involved in basin inversion processes.

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Section: Paleomagnetismmentioning

confidence: 69%

Paleomagnetic, structural, and stratigraphic constraints on transverse fault kinematics during basin inversion: The Pamplona Fault (Pyrenees, north Spain)

et al. 2003

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“…(a) Simplified structural map with location of the paleomagnetic sites used for the strike test of the study area. PA1 from Pascual et al [1992]. Only sites from pretectonic units with α 95 less than 15°have been considered (see supporting information Table S2 for details).…”

Section: Paleomagnetic Directions Versus Structural Trendmentioning

confidence: 99%

The Ainsa Fold and thrust oblique zone of the central Pyrenees: Kinematics of a curved contractional system from paleomagnetic and structural data

et al. 2013

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[1] Integration of structural, stratigraphic, and paleomagnetic data from the N-S trending structures of the Ainsa Oblique Zone reveals the kinematics of the major thrust salient in the central Pyrenees. These structures experienced clockwise vertical axis rotations that vary from 70°in the east (Mediano anticline) to 55°in the west (Boltaña anticline). Clockwise vertical axis rotations of 60°to 45°occurred from early Lutetian to late Bartonian when the folds and thrusts of the Ainsa Oblique Zone developed. This vertical axis rotation stage resulted from a difference of about 50 km in the amount of displacement on the Gavarnie thrust and an accompanying change in structural style at crustal scale from the central to the western Pyrenees, related to the NE-SW trending pinch out of Triassic evaporites at its basal detachment. A second rotation event of at least 10°took place since Priabonian, as a result of a greater displacement of the Serres Marginals thrust sheet with respect to the Gavarnie thrust sheet above the Upper Eocene-Oligocene salts. The deduced kinematics demonstrates that the orogenic curvature of the central Pyrenees is a progressive curvature resulting from divergent thrust transport direction. Layer parallel shortening mesostructures and kilometer-scale folds also developed by a progressive curvature related to divergent shortening directions during vertical axis rotation. Rotation space problems were solved by along-strike extension which triggered the formation of transverse extensional faults and diapirs at the outer arcs of structural bends.Citation: Mun˜oz, J.-A., E. Beamud, O. Ferna´ndez, P. Arbue´s, J. Dinare`s-Turell, and J. Poblet (2013), The Ainsa Fold and thrust oblique zone of the central Pyrenees: Kinematics of a curved contractional system from paleomagnetic and structural data, Tectonics, 32, 1142Tectonics, 32, -1175

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“…Dominant diamagnetism does not hinder the acquisition of meaningful results, as illustrated (Fig. 7) by a thermomagnetic run using a sandstone from the Campo section in the Pyrenees, Spain (Pascual et al 1992). The maximum field cycling interval (15-400 mT) was selected.…”

Section: Paramagnetismmentioning

confidence: 99%

Continuous drift correction and separate identification of ferrimagnetic and paramagnetic contributions in thermomagnetic runs

Mullender¹,

Velzen²,

Dekkers³

1993

Geophysical Journal International

178

132

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S U M M A R YThe principle of a Curie balance was changed by using a sinusoidally cycling applied magnetic field instead of a fixed applied field. This was done with a horizontal translation type Curie balance. By cycling between field values B,,, and B,,,, the output signal is amenable to Fourier analysis. Partial Fourier analysis yields the fundamental harmonic and the second harmonic, termed SIG, and SIGz respectively. These are related to the saturation magnetization (Ms) by M, = (2 SIG, -8 SIG2 [ ( B m a x + B m i n ) / ( B m a x -Bm,,,)]}/[A"(Bmdx -Bm,,,)] and to the paramagnetic susceptibility (xpdr) by xpar = 8 SIGz/[A"(B,,, -B,,,J2], whereby A" is a calibration constant. Through the Fourier analysis continuous drift correction is achieved simultaneously. A personal computer takes care of field control, temperaturecontrol and data acquisition in real time mode, as well as processing the data, to yield SIG, and SIGz. After the experiment, SIG, and SIG, are processed further with a separate transversal filtering program that improves the signal-to-noise ratio. The working temperature range of the adapted horizontal translation type Curie balance is between room temperature and 900°C. Its noise level corresponds to a magnetic moment of 2 x lop9 Am2, making it a very powerful tool for thermomagnetic analysis of weakly magnetic material. Examples demonstrating this potential of the device are shown.

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Magnetostratigraphy and rock magnetism of the Ilerdian stratotype at Tremp, Spain

Cited by 13 publications

References 24 publications

Paleomagnetic, structural, and stratigraphic constraints on transverse fault kinematics during basin inversion: The Pamplona Fault (Pyrenees, north Spain)

Paleomagnetic, structural, and stratigraphic constraints on transverse fault kinematics during basin inversion: The Pamplona Fault (Pyrenees, north Spain)

The Ainsa Fold and thrust oblique zone of the central Pyrenees: Kinematics of a curved contractional system from paleomagnetic and structural data

Continuous drift correction and separate identification of ferrimagnetic and paramagnetic contributions in thermomagnetic runs

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