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Manatschal, Giänreto; Bernoulli, Daniel

doi:10.1023/a:1004459106686

Cited by 49 publications

(10 citation statements)

References 38 publications

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“…[40] Examples of highly segmented rift margins of the ancient Tethys Ocean are exposed in the Alps [Froitzheim and Manatschal, 1996;Manatschal and Bernoulli, 1998;Manatschal, 2004]. One of these regions, the Ligurian Basin, is compared in Figure 13 with the interpreted evolution of the southwest Iberian margin during the Triassic -Early Cretaceous.…”

Section: Controls On the Morphology Of Lower Plate Marginsmentioning

confidence: 99%

“…As a result, passive margins are commonly classified as ''volcanic'' or ''nonvolcanic,'' depending on the relative expression of riftrelated igneous processes along them Tucholke and Sibuet, 2007]. When variations in the structure of crustal segments are considered across conjugate pairs of margins, the concepts of ''upper plate'' and ''lower plate'' margins are commonly evoked [Wernicke, 1985;Lister et al, 1986Lister et al, , 1991Manatschal and Bernoulli, 1998;. On lower plate margins as west Iberia, sets of oceanward dipping extensional faults appear to detach downward into a pervasive detachment zone, the S or H reflector (e.g., Galician margin Boillot and Froitzheim, 2001;Reston and Pérez-Gussinyé, 2007]).…”

Section: Introductionmentioning

confidence: 99%

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Diachronous evolution of Late Jurassic–Cretaceous continental rifting in the northeast Atlantic (west Iberian margin)

et al. 2009

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Regional (2‐D) seismic reflection profiles, outcrop, and borehole data are used to characterize the evolution of deep offshore sedimentary basins in southwest Iberia (Alentejo Basin). The interpreted data indicate the bulk of Late Jurassic–earliest Cretaceous subsidence occurred in the present‐day continental slope area, as shown by (1) significant thickening of synrift strata basinward from a slope‐bounding fault system (SFS), west of which the total thickness of sediment can reach more than 9.0 km, and (2) relatively thin Mesozoic strata east of the SFS, where thickening of synrift units against principal faults is limited. Five principal regressive events and their basal unconformities reflect tectonic uplift and relative emersion in proximal basins, which were located on the rift shoulder to subsiding tilt blocks west of the SFS. These regressive events are correlated with major rift‐related events occurring on the deeper margin. Direct comparisons with the Peniche Basin of northwest Iberia reveal that significant portions of the Iberian lower plate margin were uplifted and eroded during the last stages of continental rifting. This process was repeated at different times (and in different areas) as the locus of rifting and continental breakup migrated northward. As a result, two distinct rift axes are recognized in west Iberia, a first axis extending from the Porto Basin to the Alentejo Basin and a second axis located on the outer proximal margin north of 38°30N. In addition, the SFS delimited (1) prograding deposits of Cretaceous‐Paleogene age and (2) late Cenozoic deposits draping the modern continental slope. These latter facts demonstrate that on lower plate passive margins, the relative position of the continental slope is established during the final rifting episode(s) preceding continental breakup.

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Section: Controls On the Morphology Of Lower Plate Marginsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Diachronous evolution of Late Jurassic–Cretaceous continental rifting in the northeast Atlantic (west Iberian margin)

et al. 2009

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“…The formation of the Iberian-Newfoundland conjugate margins are primarily a result of a series of northward propagating Late Triassic to Early Cretaceous episodes of rift-ing (Manatschal and Bernoulli, 1999;Wilson et al, 2001;Alves et al, 2009). Progressive extension and final localization of the divergent plate boundary at a mid-ocean ridge led to the separation of the North American and the Iberian plates.…”

Section: Study Area -Tectonic Evolution and Controversiesmentioning

confidence: 99%

Uncertainties in break-up markers along the Iberia–Newfoundland margins illustrated by new seismic data

Causer

Pérez-Díaz²,

Adam

et al. 2020

Solid Earth

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Abstract. Plate tectonic modellers often rely on the identification of “break-up” markers to reconstruct the early stages of continental separation. Along the Iberian-Newfoundland margin, so-called break-up markers include interpretations of old magnetic anomalies from the M series, as well as the “J anomaly”. These have been used as the basis for plate tectonic reconstructions are based on the concept that these anomalies pinpoint the location of first oceanic lithosphere. However, uncertainties in the location and interpretation of break-up markers, as well as the difficulty in dating them precisely, has led to plate models that differ in both the timing and relative palaeo-positions of Iberia and Newfoundland during separation. We use newly available seismic data from the Southern Newfoundland Basin (SNB) to assess the suitability of commonly used break-up markers along the Newfoundland margin for plate kinematic reconstructions. Our data show that basement associated with the younger M-series magnetic anomalies is comprised of exhumed mantle and magmatic additions and most likely represents transitional domains and not true oceanic lithosphere. Because rifting propagated northward, we argue that M-series anomaly identifications further north, although in a region not imaged by our seismic, are also unlikely to be diagnostic of true oceanic crust beneath the SNB. Similarly, our data also allow us to show that the high amplitude of the J Anomaly is associated with a zone of exhumed mantle punctuated by significant volcanic additions and at times characterized by interbedded volcanics and sediments. Magmatic activity in the SNB at a time coinciding with M4 (128 Ma) and the presence of SDR packages onlapping onto a basement fault suggest that, at this time, plate divergence was still being accommodated by tectonic faulting. We illustrate the differences in the relative positions of Iberia and Newfoundland across published plate reconstructions and discuss how these are a direct consequence of the uncertainties introduced into the modelling procedure by the use of extended continental margin data (dubious magnetic anomaly identifications, break-up unconformity interpretations). We conclude that a different approach is needed for constraining plate kinematics of the Iberian plate pre-M0 times.

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“…The Jurassic rifting and subsidence history across the Alps has been modeled in several papers (Winterer and Bosellini, 1981;Sarti et al, 1992;Bertotti et al, 1993;Manatschal and Bernoulli, 1998;Berra et al, 2009). Jurassic master faults are ~30-40 km apart, and their vertical throws can be greater than 7 km.…”

Section: Tectonic Historymentioning

confidence: 99%

“…Jurassic master faults are ~30-40 km apart, and their vertical throws can be greater than 7 km. Some faults have obvious listric geometries, fl attening at the ductile-brittle transition in the mid-to lower crust (10-15 km) (Bertotti, 1991;Bertotti et al, 1993;Sarti et al, 1992;Manatschal and Bernoulli, 1998), and producing asymmetric basins. Stretching was generally oriented E-W (N-S extensional faults).…”

Section: Tectonic Historymentioning

confidence: 99%

Jurassic rifting evolution of the Apennines and Southern Alps (Italy): Parallels and differences

Santantonio

Carminati

2010

Geological Society of America Bulletin

100

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Untitled

Cited by 49 publications

References 38 publications

Diachronous evolution of Late Jurassic–Cretaceous continental rifting in the northeast Atlantic (west Iberian margin)

Diachronous evolution of Late Jurassic–Cretaceous continental rifting in the northeast Atlantic (west Iberian margin)

Uncertainties in break-up markers along the Iberia–Newfoundland margins illustrated by new seismic data

Jurassic rifting evolution of the Apennines and Southern Alps (Italy): Parallels and differences

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