Three-dimensional evolution of salt-controlled minibasins: Interactions, folding and megaflap development

Callot, Jean‐Paul; Salel, Jean-François; Letouzey, J.; Daniel, Jean-Marc; Ringenbach, Jean‐Claude

doi:10.1306/03101614087

Cited by 35 publications

(41 citation statements)

References 59 publications

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“…The same architecture can also be observed in the eastern part of the study area, toward a welded diapir (Figure e). This geometry is comparable to the so‐called megaflaps classically observed in salt‐controlled provinces (Callot et al, ; Kergaravat et al, ; Rowan et al, ). It evidences the synsedimentary folding with final overturning of the pre‐HE and syn‐HE layers during the growth of the salt structure.…”

Section: Architecture Of Eastern Basque‐cantabrian Basin: Evidence Fosupporting

confidence: 82%

The Nappe des Marbres Unit of the Basque‐Cantabrian Basin: The Tectono‐thermal Evolution of a Fossil Hyperextended Rift Basin

et al. 2019

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The architecture of the Pyrenean‐Cantabrian belt results from the inversion of a series of former Cretaceous rift basins. A HT‐LP metamorphic event dated at 105 to 85 Ma ago is commonly associated with an Albo‐Cenomanian episode of hyperextension of the continental crust. This metamorphism is well known in the eastern Basque‐Cantabrian Basin within the Nappe des Marbres Unit (NMU) that is preserved from intense compressional deformation during the Pyrenean orogeny. Based on a structural study at the scale of the eastern Basque‐Cantabrian Basin and on a dense sampling for TRSCM estimates with the Raman spectroscopy of carbonaceous material (RSCM) method (Raman Spectrometry on Carbonaceous Material), we show following results: (1) the NMU has recorded two major phases of deformation, related to a localized extensional ductile foliation (S1) during the Cretaceous rifting and later by the regional N‐S shortening, recorded by a regional cleavage (S2) observed only in shale sediments. (2) The NMU is affected by early salt tectonics related to several diapirs and salt walls fed by the Upper Triassic evaporitic layer. (3) The NMU recorded maximum temperatures exceeding 550°C, which represent some of the highest temperatures along the Pyrenees. These new data demonstrate that there is no E‐W lateral metamorphic gradient across the belt and that hyperextension rifting occurred consistently within a high‐thermal regime; (4) metamorphic isograds are oblique in respect of the main structures, suggesting that the metamorphic event postdates most of the early salt‐related deformations prior to or coeval with early stages of rifting. As it represents one of the best preserved example of preorogenic hyperextended basin, the eastern Basque‐Cantabrian Basin record may be used regionally to better understand the rift to orogen evolution of the Pyrenean Internal Metamorphic Zone but also more generally as an analog of salt‐bearing hyperextended rift record.

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Section: Architecture Of Eastern Basque‐cantabrian Basin: Evidence Fosupporting

confidence: 82%

The Nappe des Marbres Unit of the Basque‐Cantabrian Basin: The Tectono‐thermal Evolution of a Fossil Hyperextended Rift Basin

et al. 2019

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“…These 211 models allow us to systematically investigate how changes in salt thickness, related to base-salt relief, 212 might impact impact minibasin subsidence patterns (cf. Callot et al, 2016). Details on the model 213 materials and set-up are provided below and in the related figure captions.…”

Section: Dataset and Methods 185 186mentioning

confidence: 99%

The stratigraphic record of minibasin subsidence, Precaspian Basin, Kazakhstan

et al. 2019

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22Minibasins are fundamental components of many salt-bearing sedimentary basins, where they may host 23 large volumes of hydrocarbons. Although we understand the basic mechanics governing their 24 subsidence, we know surprisingly little of how minibasins subside in three-dimensions over geological 25timescales, or what controls such variability. Such knowledge would improve our ability to constrain 26 initial salt volumes in sedimentary basins, the timing of salt welding, and the distribution and likely 27 charging histories of suprasalt hydrocarbon reservoirs. We use 3D seismic reflection data from the 28 Precaspian Basin, onshore Kazakhstan to reveal the subsidence histories of 16, Upper Permian-to-29 Triassic, suprasalt minibasins. These minibasins subsided into a Lower-to-Middle Permian salt layer 30 that contained numerous relatively strong, clastic-dominated minibasins encased during an earlier, latest 31 Permian phase of diapirism; because of this, the salt varied in thickness. Suprasalt minibasins contain a 32 stratigraphic record of symmetric (bowl-shaped units) and then asymmetric (wedge-shaped units) 33 subsidence, with this change in style seemingly occurring at different times in different minibasins, and 34 most likely prior to welding. We complement our observations from natural minibasins in the 35 Precaspian Basin with results arising from new physical sandbox models; this allows us to explore the 36 volumes) is a key challenge when attempting to unravel the geodynamics of continental breakup (e.g. 63 Davison et al., 2012), whereas the timing of salt welding is of critical importance for understanding the 64 potential for and the timing of the transmission of hydrocarbons through welds from subsalt source 65 rocks into suprasalt reservoirs (Rowan, 2004). 66Despite their ubiquity and importance, and although they are typically well-imaged in seismic 67 reflection data and penetrated by numerous boreholes, surprisingly little is known about the variability 68 of minibasin subsidence, and what controls this in time and space (see Clark et al. 1998 for an exception; 69 Fig. 1E). This reflects how few published studies have employed high-quality, regionally-extensive 3D 70 seismic reflection datasets to map their synkinematic strata, the architecture of which preserve a record 71 of salt tectonic-related changes in accommodation. Using 2D seismic reflection and borehole data from 72 the northern Gulf of Mexico, Rowan and Weimer (1998) document four types of seismic-stratigraphic 73 3 packages within Pliocene-Pleistocene minibasins subsiding into thick allochthonous salt. Each type 74defines a different style of minibasin subsidence, with periods of broadly symmetrical subsidence 75 recorded by 'bowls' and 'layers', and asymmetric subsidence and minibasin tilting defined by 'wedges' 76 ( Fig. 1A and C). Rowan and Weimer (1998) conclude the transition from bowl-to wedge-shaped 77 packages is driven by and thus records, minibasin welding during passive diapirism (see Fig. 1A; see 78also Kergaravat et al....

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“…Many fold-thrust belts around the world such as the Zagros (Jahani et al, 2009;Callot et al, 2012), the Atlas (Saura et al, 2014;Gharbi et al, 2015;Teixell et al, 2017) or the southern Pyrenees (López-Mir et al, 2014;Saura et al, 2016) are characterized by precontractional halokinetic structures including salt-cored anticlines, domes, diapirs or walls together with minibasins (Trusheim, 1960;Worrall and Snelson, 1989). Classically, the ductile salt is evacuated from under the subsiding minibasins by sedimentary loading and expulsed laterally and toward the surface in diapiric structures (e.g., Peel, 2014;Callot et al, 2016). Timing of halokinetic processes is recorded by the syn-salt tectonic infilling of the minibasins and by intraformational unconformities (growth wedges) in the minibasin flanks.…”

Section: Pre-contractional Halokinetic Features In the South Provencementioning

confidence: 99%

“…Fold-thrust belts can be superimposed on salt-bearing passive margins including preexisting halokinetic structures with sediment thickness variability (e.g., salt walls, domes, salt-cored anticlines and diapirs, and minibasins sinking into salt). Shortening in such irregular structural systems leads to the development of more complex fold-thrust belts with the influence of pre-and syncompressional salt tectonics (e.g., Callot et al, 2007;Hudec and Jackson, 2009;Jahani et al, 2009;Peel, 2014;Kergaravat et al, 2016;Callot et al, 2016;Duffy et al, 2018). Therefore, a fundamental problem is to determine how thick-skinned, thin-skinned and salt tectonics interfere in a contractional setting and restore the geometry of the inherited structures.…”

Section: Introductionmentioning

confidence: 99%

Mesozoic halokinesis and basement inheritance in the eastern Provence fold-thrust belt, SE France

et al. 2019

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The Provence Chain incorporated preexisting halokinetic and basement features which have played a key role in the structural evolution of the thrust systems. Field structural data, previously published geological maps and exploration well data have been used to interpret a new ~80 km-long balanced and restored cross section across the eastern Provence fold-thrust Diapiric structures were mainly eroded during and after the Pyrenean-Provence compression then reactivated during Oligocene extension and Miocene to present-day Alpine compression. Cross section balancing shows a total horizontal shortening of 28.5 km related to the Pyrenean-Provence and Alpine compressions. The eastern Provence fold-thrust belt integrates preexisting halokinetic folding which can be misinterpreted as resulting to compression. This suggests that a significant amount of folding in fold-thrust belts can results from an early halokinetic fold system developed during the pre-contractional passive margin evolution.

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Three-dimensional evolution of salt-controlled minibasins: Interactions, folding and megaflap development

Abstract: Please note that this is an author-produced PDF of an article accepted for publication following peer review. The definitive publisher-authenticated version is available on the publisher Web site.

Cited by 35 publications

References 59 publications

The Nappe des Marbres Unit of the Basque‐Cantabrian Basin: The Tectono‐thermal Evolution of a Fossil Hyperextended Rift Basin

The Nappe des Marbres Unit of the Basque‐Cantabrian Basin: The Tectono‐thermal Evolution of a Fossil Hyperextended Rift Basin

The stratigraphic record of minibasin subsidence, Precaspian Basin, Kazakhstan

Mesozoic halokinesis and basement inheritance in the eastern Provence fold-thrust belt, SE France

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