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Betic corridor

The Betic Corridor, or North-Betic Strait, was a strait of water connecting the Mediterranean Sea with the Atlantic Ocean that once separated the Iberian plate from the Eurasian plate through the Betic Cordillera.[1] Its closure approximately 5.96 million years ago during the Messinian period of the Miocene epoch, precipitated the Messinian Salinity Crisis, a period when the Mediterranean Sea evaporated partly or completely.[2]

A reconstruction of the paleogeography inferred at the west (Atlantic) end of the Mediterranean Sea during the early- to mid- Miocene; north is to the left. * Red = current coastline * S = Sorbas basin, Spain * R = Rifean corridor * B = Betic corridor * G = Strait of Gibraltar * M = Mediterranean Sea

Geology

Betic corridor rock facies consist of heterozoan bioclastic carbonates and mixed siliciclastic–carbonates with conglomerates appearing in local fan-delta deposits. Betic deposits exhibit huge trough cross-bedded structures with single troughs up to 5 m high pointing to the east in the easternmost outcrops. In central outcrops, they reach up to 15 m in height and some tens of metres in length and point both to the east and to the west. The westernmost outcrops show the largest cross-bedded structures, up to 20 m in height and some hundred of metres in length, all pointing to the west. The large-scale cross-bedding was generated by the migration of very large dunes moved by tides. The largest structures are inferred to have formed at depths of 90 m. Depth estimations indicate that the Betic corridor shallowed toward the Mediterranean and deepened toward the Atlantic. The Miocene evolution towards the formation of the Betic corridor can be divided into a series of steps. The palaeogeography evolved from a south-facing platform, marginal to a northeastern relief, to a wide-open marine passage limited by a southern platform and, finally, to a tidal-dominated strait. The closing of the Betic corridor is recorded by the presence of lagoonal, silty sediments covered by a stromatolite layer and crowned by a red soil in the westernmost outcrops.[3]

References

  1. ^ Seber, D.; Barazangi, M.; Ibenbrahim, A.; Demnati, A. (1996). "Geophysical evidence for lithospheric delamination beneath the Alboran Sea and Rif--Betic mountains". Nature. 379 (6568): 785–790. Bibcode:1996Natur.379..785S. doi:10.1038/379785a0. hdl:1813/5287. S2CID 4332684.
  2. ^ Krijgsman, W.; Garcés, M.; Langereis, C.G.; Daams, R.; Van Dam, J.; Van Der Meulen, A.J.; Agustí, J.; Cabrera, L. (1996). "A new chronology for the middle to late Miocene continental record in Spain" (PDF). Earth and Planetary Science Letters. 142 (3–4): 367–380. Bibcode:1996E&PSL.142..367K. doi:10.1016/0012-821X(96)00109-4.
  3. ^ José M. Martín; Juan C. Bragaa; Julio Aguirrea & Ángel Puga-Bernabéua (2009-04-15). "History and evolution of the North-Betic Strait (Prebetic Zone, Betic Cordillera): A narrow, early Tortonian, tidal-dominated, Atlantic–Mediterranean marine passage". Sedimentary Geology. 216 (3–4): 80–90. Bibcode:2009SedG..216...80M. doi:10.1016/j.sedgeo.2009.01.005.

betic, corridor, betic, corridor, north, betic, strait, strait, water, connecting, mediterranean, with, atlantic, ocean, that, once, separated, iberian, plate, from, eurasian, plate, through, betic, cordillera, closure, approximately, million, years, during, m. The Betic Corridor or North Betic Strait was a strait of water connecting the Mediterranean Sea with the Atlantic Ocean that once separated the Iberian plate from the Eurasian plate through the Betic Cordillera 1 Its closure approximately 5 96 million years ago during the Messinian period of the Miocene epoch precipitated the Messinian Salinity Crisis a period when the Mediterranean Sea evaporated partly or completely 2 A reconstruction of the paleogeography inferred at the west Atlantic end of the Mediterranean Sea during the early to mid Miocene north is to the left Red current coastline S Sorbas basin Spain R Rifean corridor B Betic corridor G Strait of Gibraltar M Mediterranean SeaGeology EditBetic corridor rock facies consist of heterozoan bioclastic carbonates and mixed siliciclastic carbonates with conglomerates appearing in local fan delta deposits Betic deposits exhibit huge trough cross bedded structures with single troughs up to 5 m high pointing to the east in the easternmost outcrops In central outcrops they reach up to 15 m in height and some tens of metres in length and point both to the east and to the west The westernmost outcrops show the largest cross bedded structures up to 20 m in height and some hundred of metres in length all pointing to the west The large scale cross bedding was generated by the migration of very large dunes moved by tides The largest structures are inferred to have formed at depths of 90 m Depth estimations indicate that the Betic corridor shallowed toward the Mediterranean and deepened toward the Atlantic The Miocene evolution towards the formation of the Betic corridor can be divided into a series of steps The palaeogeography evolved from a south facing platform marginal to a northeastern relief to a wide open marine passage limited by a southern platform and finally to a tidal dominated strait The closing of the Betic corridor is recorded by the presence of lagoonal silty sediments covered by a stromatolite layer and crowned by a red soil in the westernmost outcrops 3 References Edit Seber D Barazangi M Ibenbrahim A Demnati A 1996 Geophysical evidence for lithospheric delamination beneath the Alboran Sea and Rif Betic mountains Nature 379 6568 785 790 Bibcode 1996Natur 379 785S doi 10 1038 379785a0 hdl 1813 5287 S2CID 4332684 Krijgsman W Garces M Langereis C G Daams R Van Dam J Van Der Meulen A J Agusti J Cabrera L 1996 A new chronology for the middle to late Miocene continental record in Spain PDF Earth and Planetary Science Letters 142 3 4 367 380 Bibcode 1996E amp PSL 142 367K doi 10 1016 0012 821X 96 00109 4 Jose M Martin Juan C Bragaa Julio Aguirrea amp Angel Puga Bernabeua 2009 04 15 History and evolution of the North Betic Strait Prebetic Zone Betic Cordillera A narrow early Tortonian tidal dominated Atlantic Mediterranean marine passage Sedimentary Geology 216 3 4 80 90 Bibcode 2009SedG 216 80M doi 10 1016 j sedgeo 2009 01 005 Retrieved from https en wikipedia org w index php title Betic corridor amp oldid 1164122192, wikipedia, wiki, book, books, library,

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