• Source: Araripe Basin

The Araripe Basin (Portuguese: Bacia do Araripe) is a rift basin covering about 8,000 square kilometres (3,100 sq mi), in Ceará, Piauí and Pernambuco states of northeastern Brazil. It is bounded by the Patos and Pernambuco lineaments, and is situated east of the Parnaíba Basin, southwest of the Rio do Peixe Basin and northwest of the Tucano and Jatobá Basins.
The basin has provided a variety of unique fossils in the Crato and Santana Formations and includes the Araripe Geopark, a member of the UNESCO Global Geoparks since 2006. The pterosaurs Araripesaurus and Araripedactylus (now considered a nomen dubium), crocodylian Araripesuchus, the turtle Araripemys, amphibian Arariphrynus, the fish Araripelepidotes and the insect Araripenymphes were named after the basin. The bituminous shales of the Ipubi Formation in the Araripe Basin have potential for shale gas development.




Basin history



The tectono-sedimentary evolution of the Araripe Basin, located in the Borborema Geologic Province, encompasses four stages, with five tectonostratigraphic phases:
1) Syneclise phase - Silurian to Devonian - characterized by tectonic quiescence in the Borborema Province. It is represented by the deposits of the Cariri Formation, that include medium to coarse-grained quartz sandstones, locally conglomeratic, deposited in large braided fluvial systems
2) Pre-rift phase - Tithonian - characterized by the mechanical subsidence due to lithosphere thinning that preceded the rift. It is represented by the Brejo Santo Formation, that comprises red shales and claystones, and the Missão Velha Formation, constituted by medium to coarse-grained quartz-feldspathic sandstones, locally conglomeratic, that contains entire trunks and fragments of silicified wood (Dadoxilon benderi) conifer
3) Rift phase - Berriasian to Hauterivian - characterized by increasing mechanical subsidence that created a system of grabens and half grabens. It is represented by the Abaiara Formation, that includes shales, siltstones, sandstones and conglomerates
4) Post-Rift I phase - Aptian to Albian - characterized by thermal subsidence. The lowermost unit Barbalha Formation, represents a fluviolacustrine phase and is composed of red and gray shales, siltstones and claystones.
The Santana Group was formed during this stage and comprises three stratigraphic units:

Crato Formation that is composed of six intervals of laminated limestones (C1 to C6), interbedded with calciferous siltstones and marls, and is very rich in fossils of vertebrate and invertebrate organisms
Ipubi Formation, that is mainly composed of organic-rich, black greenish bituminous shales, claystones and algal limestones that are interbedded with gypsum-anhydrite beds
Romualdo Formation, that represents a calciferous siliciclastic succession composed of fine to medium-grained sandstones, argillaceous siltstones, calciferous shales, and limestones, very rich in fossils. This formation recorded the marine proto-Atlantic incursion that involved the Araripe Basin, and other interior basins and created a large seaway throughout the Borborema Province during the Albian
5) Post-rift II phase - Albian to Cenomanian - characterized by a major sag phase, and is formed by two stratigraphic units:

Araripina Formation, that occurs in the western region of the basin and is composed by rhythmites and heterolithic layers of reddish, purplish and yellowish fine-grained sandstone and mudstone
Exu Formation, that comprises medium-to coarse grained sandstones, fine grained clayey sandstones and local conglomeratic beds




Stratigraphy






See also



Chapada do Araripe
Paraná Basin
Santos Basin




References






= Bibliography

=
Assine, Mario L (1992), "Análise estratigráfica da Bacia do Araripe, Nordeste do Brasil" (PDF), Revista Brasileira de Geociências, 22 (3): 289–300, doi:10.25249/0375-7536.1992289300, retrieved 2018-08-21
Bétard, François; Peulvast, Jean-Pierre; de Oliveira Magalhães, Alexsandra; Carvalho Neta, Maria de Lourdes; de Freitas, Francisco Idalecio (2017), "Araripe Basin: A Major Geodiversity Hotspot in Brazil" (PDF), Geoheritage, 10 (4): 1–18, Bibcode:2018Geohe..10..543B, doi:10.1007/s12371-017-0232-5, retrieved 2018-08-21 Archived 2018-08-21 at the Wayback Machine
Fabin, Carlos E.; Correia Filho, Osvaldo J.; Alencar, Márcio L.; Barbosa, José A.; de Miranda, Tiago S.; Neumann, Virgínio H.; Gomes, Igor F.; de Santana, Felipe R. (2018), "Stratigraphic Relations of the Ipubi Formation: Siliciclastic-Evaporitic Succession of the Araripe Basin" (PDF), Anais da Academia Brasileira de Ciências, 90 (2 suppl 1): 2049–2071, doi:10.1590/0001-3765201820170526, PMID 29947671, retrieved 2018-10-05
Neto, João Adauto; Mort, Haydon; Pereira, Ricardo; Barbosa, José; Neumann, Virginio; Vortisch, Walter; Filho, Osvaldo J. C.; Brandão, Paulo de A. L. S.; Pacheco, José G. A. (2013), Carbonaceous Shales in the Araripe Basin, NE Brazil: A Potential Shale Gas Reservoir, AAPG Annual Convention and Exhibition, pp. 1–7, retrieved 2018-08-21
Ribeiro Oliveira, Gustavo; Feitosa Saraiva, Antônio Álamo; de Paula Silva, Helder; Ferreira Gomes de Andrade, José Artur; Kellner, Alexander Wilhelm Armin (2011), "First turtle from the Ipubi Formation (Early Cretaceous), Santana Group, Araripe Basin, Brazil" (PDF), Revista Brasileira da Paleontologia, 14: 61–66, doi:10.4072/RBP.2011.1.06, S2CID 32314916, archived from the original (PDF) on 2018-08-21, retrieved 2018-08-21 Archived 2018-08-21 at the Wayback Machine
Scherer, C.M.d.S.; Jardim de Sá, E.F.; Córdoba, V.C.; Sousa, D.d.C.; Aquino, M.M.; Cardoso, F.M.C. (2013), "Tectono-Stratigraphic evolution of the upper Jurassic-Neocomian rift succession, Araripe Basin, Northeast Brazil" (PDF), Journal of South American Geosciences, 49: 1–43, Bibcode:2014JSAES..49..106M, doi:10.1016/j.jsames.2013.10.007, hdl:10316/27124, retrieved 2018-08-21




Further reading


Aparecida dos Reis Polck, Márcia; Sardenberg Salgado de Carvalho, Marise; Miguel, Raphael; Gallo, Valéria (2015), Guia de identificação de peixes fósseis das Formações Crato e Santana da Bacia do Araripe, Serviço Geológico do Brasil (CPRM), pp. 1–74
Báez, A.M.; Moura, G.J.B.; Gómez, R.O. (2009), "Anurans from the Lower Cretaceous Crato Formation of northeastern Brazil: implications for the early divergence of neobatrachians", Cretaceous Research, 30 (4): 829–846, Bibcode:2009CrRes..30..829B, doi:10.1016/j.cretres.2009.01.002
Bechly, G.; Makarkin, V. N. (2016), "A new gigantic lacewing species (Insecta: Neuroptera) from the Lower Cretaceous of Brazil confirms the occurrence of Kalligrammatidae in the Americas", Cretaceous Research, 58: 135–140, Bibcode:2016CrRes..58..135B, doi:10.1016/j.cretres.2015.10.014
Cavalcanti Duque, Rudah Ruano; Franca Barreto, Alcina Magnólia (2018), "Novos Sítios Fossilíferos da Formação Romualdo, Cretáceo Inferior, Bacia do Araripe, Exu, Pernambuco, Nordeste do Brasil - New Fossiliferous Sites of the Romualdo Formation, Lower Cretaceous, Araripe Basin, Exu, Pernambuco, Northeast of Brazil", Anuário do Instituto de Geociências, UFRJ, 41: 5–14, doi:10.11137/2018_1_05_14, retrieved 2018-10-06
Elgin, Ross A.; Frey, Eberhard (2011), "A new ornithocheirid, Barbosania gracilirostris gen. et sp. nov. (Pterosauria, Pterodactyloidea) from the Santana Formation (Cretaceous) of NE Brazil", Swiss Journal of Palaeontology, 130 (2): 259, Bibcode:2011SwJP..130..259E, doi:10.1007/s13358-011-0017-4, retrieved 2018-10-06
Fara, Emmanuel; Saraiva, Antônio Á.F.; Campos, Díogenes de Almeida; Moreira, João K.R.; de Carvalho Siebra, Daniele; Kellner, Alexander W.A. (2005), "Controlled excavations in the Romualdo Member of the Santana Formation (Early Cretaceous, Araripe Basin, northeastern Brazil): stratigraphic, palaeoenvironmental and palaeoecological implications" (PDF), Palaeogeography, Palaeoclimatology, Palaeoecology, 218 (1–2): 145–160, Bibcode:2005PPP...218..145F, doi:10.1016/j.palaeo.2004.12.012, retrieved 2018-10-06
Figueiredo, R.G.; Kellner, A.W.A. (2009), "A new crocodylomorph specimen from the Araripe Basin (Crato Member, Santana Formation), northeastern Brazil", Paläontologische Zeitschrift, 83 (2): 323–331, Bibcode:2009PalZ...83..323F, doi:10.1007/s12542-009-0016-6, retrieved 2018-10-06
Jorge de Lima, Flaviana; Feitosa Saraiva, Antonio Álamo; Manso Sayão, Juliana (2012), "Revisão da paleoflora das Formações Missão Velha, Crato e Romualdo, Bacia do Araripe, nordeste do Brasil", Estudos Geológicos, 22 (1): 99–115
Leite da Silva, Agnelo; Neumann, Virginio Enrique (2003), Formação Crato da Bacia do Araripe: um reservatório análogo ao Calcário Trairí (Formação Paracuru), Bacia do Ceará (PDF), 2o Congresso Brasileiro de P&D em Petróleo & Gás, pp. 1–6, retrieved 2018-10-06
Maisey, J.G.; Rutzky, I.; Blum, S.; Elvers, W. (1991), Laboratory Preparation Techniques. In Maisey, j:G. (ed): Santana Fossils: An Illustrated Atlas, Tfh Publications Inc., pp. 99–103, ISBN 0866225498
Makarkin, V.N.; Menon, F. (2007), "First record of fossil 'rapismatid-like' Ithonidae (Insecta, Neuroptera) from the Lower Cretaceous Crato Formation of Brazil", Cretaceous Research, 28 (5): 743–753, Bibcode:2007CrRes..28..743M, doi:10.1016/j.cretres.2006.11.003
Martill, David M.; Bechly, Günter; Loveridge, Robert F. (2007), The Crato Fossil Beds of Brazil: Window into an Ancient World, Cambridge University Press, p. 236, ISBN 978-1-139-46776-6, retrieved 2018-10-06
Martill, D.M (2007), "The age of the Cretaceous Santana Formation fossil Konservat Lagerstätte of north-east Brazil: a historical review and an appraisal of the biochronostratigraphic utility of its palaeobiota", Cretaceous Research, 28 (6): 895–920, Bibcode:2007CrRes..28..895M, doi:10.1016/j.cretres.2007.01.002, retrieved 2018-10-06
Myskowiak, J.; Huang, D.; Azar, D.; Cai, C.; Garrouste, R.; Nel, A. (2016), "New lacewings (Insecta, Neuroptera, Osmylidae, Nymphidae) from the Lower Cretaceous Burmese amber and Crato Formation in Brazil", Cretaceous Research, 59: 214–227, Bibcode:2016CrRes..59..214M, doi:10.1016/j.cretres.2015.10.029, retrieved 2018-10-06
Neumann, V.H.; Borrego, A.G.; Cabrera, L.; Dino, R. (2003), "Organic matter composition and distribution through the Aptian–Albian lacustrine sequences of the Araripe Basin, northeastern Brazil", International Journal of Coal Geology, 54 (1): 21–40, Bibcode:2003IJCG...54...21N, doi:10.1016/S0166-5162(03)00018-1, retrieved 2018-10-05
Pinheiro, Allysson P.; Saraiva, Antônio Á.F.; Santana, William (2014), "Shrimps from the Santana Group (Cretaceous: Albian): new species (Crustacea: Decapoda: Dendrobranchiata) and new record (Crustacea: Decapoda: Caridea)" (PDF), Anais da Academia Brasileira de Ciências: 1–8, retrieved 2018-10-06 Archived 2017-08-24 at the Wayback Machine
Prado, Gustavo M.E.M.; Romero, Guilherme Raffaelli; Anelli, Luiz Eduardo (2016), "New occurrences of fossilized feathers: systematics, taphonomy, and paleoecology of the Santana Formation of the Araripe Basin (Cretaceous), NE, Brazil" (PDF), PeerJ: 1–49, retrieved 2018-10-06
Salisbury, S.W.; Frey, E.; Martill, D.M.; Buchy, M.C. (2003), "A new crocodilian from the Lower Cretaceous Crato Formation of north-eastern Brazil", Palaeontographica, Abteilung A, 270 (1–3): 3–47, Bibcode:2003PalAA.270....3S, doi:10.1127/pala/270/2003/3, retrieved 2018-10-06
Scherer, C.M.d.S.; Jardim de Sá, E.F.; Córdoba, V.C.; Sousa, D.d.C.; Aquino, M.M.; Cardoso, F.M.C. (2013), "Tectono-Stratigraphic evolution of the upper Jurassic-Neocomian rift succession, Araripe Basin, Northeast Brazil" (PDF), Journal of South American Geosciences, 49: 1–43, Bibcode:2014JSAES..49..106M, doi:10.1016/j.jsames.2013.10.007, hdl:10316/27124, retrieved 2018-10-05
Weishampel, David B. (2004), Dinosaur distribution (Early Cretaceous, South America) in: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, Berkeley: University of California Press, pp. 563–570, ISBN 0-520-24209-2

Kata Kunci Pencarian:

• Tapejara
• Mygalomorphae
• Araripe Basin
• Romualdo Formation
• Irritator
• Santana Group
• Crato Formation
• Missão Velha Formation
• Welwitschiaceae
• Santana
• Anhanguera (pterosaur)
• Tropeognathus