An orocline — from the Greek words for "mountain" and "to bend" — is a bend or curvature of an orogenic (mountain building) belt imposed after it was formed.[1] The term was introduced by S. Warren Carey in 1955 in a paper setting forth how complex shapes of various orogenic belts could be explained by actual bending, and that understanding this provided "the key to understanding the evolution of the continents".[2] Carey showed that in a dozen cases where such bends were undone the results were substantially identical with continental reconstructions deduced by other means.[3] Recognition of oroclinal bending provided strong support to the subsequent theory of plate tectonics.

Examples

A composite relief image of South America. The Bolivian Orocline can be seen in the middle of the picture next to the Pacific Ocean. Further south it also possible to hint the less pronounced Maipo Orocline.

Oroclines in cratons

See also

Notes

  1. ^ Carey 1955, p. 257. Note that the initial formation does not have to be straight.
  2. ^ Carey 1955, p. 257.
  3. ^ Carey 1955, p. 255.
  4. ^ a b Isacks, Bryan L. (1988), "Uplift of the Central Andean Plateau and Bending of the Bolivian Orocline" (PDF), Journal of Geophysical Research, 93 (B4): 3211–3231, Bibcode:1988JGR....93.3211I, doi:10.1029/jb093ib04p03211
  5. ^ a b c Kley, J. (1999), "Geologic and geometric constraints on a kinematic model of the Bolivian orocline", Journal of South American Earth Sciences, 12 (2): 221–235, Bibcode:1999JSAES..12..221K, doi:10.1016/s0895-9811(99)00015-2
  6. ^ Beck, Myrl E. (1987), "Tectonic rotations on the leading edge of South America: The Bolivian orocline revisited", Geology, 15 (9): 806–808, Bibcode:1987Geo....15..806B, doi:10.1130/0091-7613(1987)15<806:trotle>2.0.co;2
  7. ^ Prezzi, Claudia B.; Vilas, Juan F. (1998). "New evidence of clockwise vertical axis rotations south of the Arica elbow (Argentine Puna)". Tectonophysics. 292 (1–2): 85–100. Bibcode:1998Tectp.292...85P. doi:10.1016/s0040-1951(98)00058-4.
  8. ^ Arriagada, César; Ferrando, Rodolfo; Córdova, Loreto; Morata, Diego; Roperch, Pierrick (2013), "The Maipo Orocline: A first scale structural feature in the Miocene to Recent geodynamic evolution in the central Chilean Andes" (PDF), Andean Geology, 40 (3): 419–437
  9. ^ Jara-Muñoz, Julius; Melnick, Daniel; Dominik, Brill; Strecker, Manfred R. (2015), "Segmentation of the 2010 Maule earthquake rupture from a joint analysis of uplifted marine terraces and seismic cycle deformation", Quaternary Science Reviews, 113: 171–192, doi:10.1016/j.quascirev.2015.01.005
  10. ^ Gutiérrez-Alonso, G.; Johnston, S.T.; Weil, A.B.; Pastor-Galán, D.; Fernández-Suárez, J. (2012). "Buckling an orogen: The Cantabrian Orocline" (PDF). GSA Today. 22 (7): 4–9. doi:10.1130/GSATG141A.1.
  11. ^ a b Faccenna C., Piromallo C., Crespo-Blanc A., Jolivet L., Federico Rossetti F.(2004) Lateral slab deformation and the origin of the western Mediterranean arcs, Tectonics, 23: (1) 1-21 [1]
  12. ^ a b Shaw J., Johnston S. T., The Carpathian–Balkan bends: an oroclinal record of ongoing Arabian–Eurasian collision, Journal of the Virtual Explorer, 43(4) [2]
  13. ^ Finetti et al, 2005, Crustal geological section across C Italy from the Corsica Basin to the Adriatic Sea based on geological and CROP Seismic data [https://www.researchgate.net/publication/256305887_Crustal_geological_section_across_central_Italy_from_the_Corsica_Basin_to_the_Adriatic_Sea_based_on_geological_and_CROP_seismic_data/citation/download}
  14. ^ Edi Kissling E., Romain Bousquet R., Ford M., Schmid S. M. (2012) Formation of the arc of the Western Alps and Alps-Apennines transition in the light of new geophysical data on the lithospheric architecture around the Ligurian knot, EGU Conference Vienna Apennines_transition_in_the_light_of_new_geophysical_data_on_the_lithospheric_architecture_around_the_Ligurian_knot
  15. ^ a b Lahtinen, R.; Sayab, M.; Johnston, S.T. (2016). "Inari orocline – progressive or secondary orocline". Institute of Seismology, University of Helsinki Report S-65. Lithosphere 2016 Ninth Symposium on the structure, composition and evolution of the lithosphere in Fennosscandia. pp. 69–74.
  16. ^ Cayley, R. (2014). "The Lachlan Orocline of Eastern Australia. Giant folds, the geodynamic processes that can form them, and how these new understandings have potential to revolutionise the resource prospectivity game in Eastern Australia". New Perspectives Workshop, September 2014. Australian Institute of Geoscientists. Retrieved 4 March 2018.
  17. ^ Chengxin Jiang; Yingjie Yang; Yong Zheng (2016). "Crustal structure in the junction of Qinling Orogen, Yangtze Craton and Tibetan Plateau: implications for the formation of the Dabashan Orocline and the growth of Tibetan Plateau". Geophysical Journal International. 205 (3): 1670–1681. doi:10.1093/gji/ggw096.

References