A ‘core-complex-like structure’ formed by superimposed extension, folding and high-angle normal faulting. The Santi Petri dome (western Betics, Spain)

Booth‐Rea, Guillermo; Azañón, José Miguel; Garcı́a-Dueñas, V.; Augier, Romain; Sánchez-Gómez, Mario

doi:10.1016/s1631-0713(03)00026-9

Cited by 16 publications

(12 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After 8 Ma, the Alboran domain, including its overlying Middle Miocene and older extensional detachments and basins, has been shortened as a result of ongoing Africa-Iberia convergence in a N-S to NW-SE direction, with deformation concentrated along sinistral N-NE trending faults, dextral W-NW trending faults, and reverse WSW-W trending faults [Aldaya et al, 1991;Crespo-Blanc et al, 1994;Lonergan et al, 1994;Lonergan and Platt, 1995;Martinez-Martinez et al, 2002;Booth-Rea et al, 2003;Platt et al, 2005;Meijninger and Vissers, 2006;Marin-Lechado et al, 2007;Benmakhlouf et al, 2013;Martinez-Garcia et al, 2013]. After 8 Ma, the region uplifted van der Laan et al, 2006;Hüsing et al, 2010], with as most spectacular effect the eventual disconnection of the waters of the Mediterranean basin from the Atlantic Ocean during the Messinian salinity crisis [Krijgsman et al, 1999].…”

Section: Review: Structure and Metamorphism Of Alkapecamentioning

confidence: 99%

Origin and consequences of western Mediterranean subduction, rollback, and slab segmentation

2014

View full text Add to dashboard Cite

The western Mediterranean recorded subduction rollback, slab segmentation and separation.Here we address the questions of what caused Oligocene rollback initiation, and how its subsequent evolution split up an originally coherent fore arc into circum-southwest Mediterranean segments. We kinematically reconstruct western Mediterranean geology from subduction initiation to present, using Atlantic plate reconstructions as boundary condition. We test possible reconstructions against remnants of subducted lithosphere imaged by seismic tomography. Transform motion between Africa and Iberia (including the Baleares) between~120 and 85 Ma was followed by up to 150 km convergence until 30 Ma. Subduction likely initiated along the transform fault that accommodated pre-85 Ma translation. By thẽ 30 Ma inception of rollback, up to 150 km of convergence had formed a small slab below the Baleares. Iberia was disconnected from Sardinia/Calabria through the North Balearic Transform Zone (NBTZ). Subduction below Sardinia/Calabria was slightly faster than below the Baleares, the difference being accommodated in the Pyrenees. A moving triple junction at the trench-NBTZ intersection formed a subduction transform edge propagator fault between the Baleares and Calabria slab segments. Calabria rolled back eastward, whereas the Baleares slab underwent radial (SW-S-SE) rollback. After Kabylides-Africa collision, the western slab segment retreated toward Gibraltar, here reconstructed as the maximum rollback end-member model, and a Kabylides slab detached from Africa. Opening of a slab window below the NBTZ allowed asthenospheric rise to the base of the fore arc creating high-temperature metamorphism. Western Mediterranean rollback commenced only after sufficient slab-pull was created from 100 to 150 km of slow, forced subduction before~30 Ma.

show abstract

Section: Review: Structure and Metamorphism Of Alkapecamentioning

confidence: 99%

Origin and consequences of western Mediterranean subduction, rollback, and slab segmentation

2014

View full text Add to dashboard Cite

show abstract

“…WSW and SE directed middle–late Miocene extension in the Betics was heterogeneous in style including core complex structures, like the Sierra Nevada elongated dome in the central Betics (Figure ) [e.g., Martínez‐Martínez et al ., , ; Booth‐Rea et al ., ] and upper crustal extension characterized by tilted block domains [e.g., García‐Dueñas et al ., ; Martínez‐Martínez and Azañón , ; Booth‐Rea et al ., , ; Martínez‐Martínez , ]. Moreover, crustal thinning offshore at the east Alborán and Algero‐Balearic basins was accommodated by magmatic accretion between the middle and late Miocene [F. Giaconia et al, submitted manuscript, 2014].…”

Section: Structural Frameworkmentioning

confidence: 99%

Heterogeneous extension and the role of transfer faults in the development of the southeastern Betic basins (SE Spain)

et al. 2014

View full text Add to dashboard Cite

Large strike-slip faults in the eastern Betics are interpreted to have developed in a transcurrent setting in response to 4-6 mm/yr of Africa-Iberia NW-SE convergence. However, here we show that some of these faults are transfer faults accommodating heterogeneous late Miocene extension. The North Cabrera dextral fault and other E-W to NE-SW strike-slip faults in the Sorbas basin were transfer faults produced under SW-NE extension. These faults together with related normal faults form the main boundaries of two sedimentary depocenters active between the Serravallian and the Tortonian. The older North Cabrera depocenter extended between the Serravallian and the early Tortonian (approximately 13.8 to 9 Ma), while the younger Gacía depocenter formed in response to late Tortonian extension (approximately 9 to 7.5 Ma). The latter formed to the west of the North Cabrera depocenter by a listric fan of normal faults with SW directed transport that are linked by dextral and sinistral transfer fault segments. These faults root on a low-angle detachment cutting into the exhumed high-pressure Nevado-Filabride complex rocks at~0.8 km depth. The present work reveals that (1) this extension was partially coeval with and kinematically linked to sinistral displacement along the Carboneras fault farther south in the Níjar basin; (2) this westward directed extension produced elongated core complexes and tilted blocks to the north of the Carboneras fault and magmatic accretion upon thinned continental crust to the south, probably in response to slab tearing or detachment and associated edge delamination of the Iberian continental lithospheric mantle beneath the Betics.

show abstract

“…WSW‐directed extension in the Betics and Rif was heterogeneous, resulting in different extensional styles, including: Upper crustal extension characterized by tilted block domains in the northeastern and western Betics and in the western Rif [e.g., García‐Dueñas et al , 1992; Booth‐Rea et al , 2003a, 2004a]. Core‐complex structures in the central Betics and the Rif [e.g., Martínez‐Martínez et al , 2002, 2004; Negro et al , 2007] and extension affecting the whole crust, producing extreme crustal thinning and magmatism in the Alborán basin [ Comas et al , 1999].…”

Section: Tectonic Settingmentioning

confidence: 99%

“…Although, we do not have a three‐dimensional control of the geometry of these normal faults, they clearly have a component of eastward‐directed extension along the direction of the ESCI‐Alb 2c seismic line. Eastward‐directed late Miocene extension in the western Algero‐Balearic basin contrasts with the westward‐directed extension observed in core‐complexes and tilted‐block domains in the Betic [e.g., García‐Dueñas et al , 1992; Martínez‐Martínez and Azañón , 1997; Martínez‐Martínez et al , 2002, 2006; Booth‐Rea et al , 2003a, 2004a] and Rif margins [ Negro , 2005; Negro et al , 2007], and in part of the Alborán basin [ Comas et al , 1992, 1995; Chalouan et al , 1997] at the time.…”

Section: Shallow Crustal Structure: Sedimentary Seismic Unitsmentioning

confidence: 99%

Crustal types and Tertiary tectonic evolution of the Alborán sea, western Mediterranean

Booth‐Rea

Ranero

Martı́nez-Martı́nez

et al. 2007

Geochem Geophys Geosyst

162

228

View full text Add to dashboard Cite

[1] Multichannel seismic reflection images across the transition between the east Alborán and the AlgeroBalearic basins show how crustal thickness decreases from about 5 s two-way traveltime (TWTT, 15 km thick) in the west (east Alborán basin) to 2 s TWTT typical of oceanic crust (6 km thick) in the east (Algero-Balearic basin). We have differentiated three different crustal domains in this transition, mainly on the basis of crustal thickness and seismic signature. Boundaries between the three crustal domains are transitional and lack evidence for major faults. Tilted blocks related to extension are very scarce and all sampled basement outcrops are volcanic, suggesting a strong relationship between magmatism and crustal structure. Stratigraphic correlation of lithoseismic units with sedimentary units of southeastern Betic basins indicates that sediments onlap igneous basement approximately at 12 Ma in the eastern area and at 8 Ma in the western area. Linking seismic crustal structure with magmatic geochemical evidence suggests that the three differentiated crustal domains may represent, from west to east, thin continental crust modified by arc magmatism, magmatic-arc crust, and oceanic crust. Middle to late Miocene arc and oceanic crust formation in the east Alborán and Algero-Balearic basins, respectively, occurred during westward migration of the Gibraltar accretionary wedge and shortening in the Betic-Rif foreland basins. Arc magmatism and associated backarc oceanic crust formation were related to early to middle Miocene subduction and rollback of the Flysch Trough oceanic basement. Subduction of this narrow slab beneath the Alborán basin was coeval with collision of the Alborán domain with the Iberian and African passive margins and subsequent subcontinental-lithosphere edge delamination along the Betic-Rif margins.

show abstract

A ‘core-complex-like structure’ formed by superimposed extension, folding and high-angle normal faulting. The Santi Petri dome (western Betics, Spain)

Cited by 16 publications

References 40 publications

Origin and consequences of western Mediterranean subduction, rollback, and slab segmentation

Origin and consequences of western Mediterranean subduction, rollback, and slab segmentation

Heterogeneous extension and the role of transfer faults in the development of the southeastern Betic basins (SE Spain)

Crustal types and Tertiary tectonic evolution of the Alborán sea, western Mediterranean

Contact Info

Product

Resources

About