Editing Convergent boundary (section)

== Continent-to-continent convergence ==
{{See also|Continental collision}}
Some lithospheric plates consist of both continental and oceanic crust. Subduction initiates as oceanic lithosphere slides beneath continental crust. As the oceanic lithosphere subducts to greater depths, the attached continental crust is pulled closer to the subduction zone. Once the continental lithosphere reaches the subduction zone, subduction processes are altered, since continental lithosphere is more buoyant and resists subduction beneath other continental lithosphere. A small portion of the continental crust may be subducted until the slab breaks, allowing the oceanic lithosphere to continue subducting, hot asthenosphere to rise and fill the void, and the continental lithosphere to rebound.<ref>{{Cite book|date=2016-01-01|publisher=Academic Press|isbn=9780128036891|doi=10.1016/b978-0-12-803689-1.00006-7|title=Earth as an Evolving Planetary System|pages=147–199|last1=Condie|first1=Kent C.|chapter=Crustal and Mantle Evolution}}</ref> Evidence of this continental rebound includes [[ultra-high-pressure metamorphism|ultrahigh pressure metamorphic rocks]], which form at depths of {{cvt|90|to|125|km}}, that are exposed at the surface.<ref>{{Cite journal|last1=Ernst|first1=W. G.|last2=Maruyama|first2=S.|last3=Wallis|first3=S.|date=1997-09-02|title=Buoyancy-driven, rapid exhumation of ultrahigh-pressure metamorphosed continental crust|journal=Proceedings of the National Academy of Sciences of the United States of America|volume=94|issue=18|pages=9532–9537|issn=0027-8424|pmc=23212|pmid=11038569|doi=10.1073/pnas.94.18.9532|bibcode=1997PNAS...94.9532E|doi-access=free}}</ref> Seismic records have been used to map the torn slabs beneath the [[Caucasus]] continental – continental convergence zone,<ref>{{cite journal|last1=Mumladze|first1=Tea|last2=Forte|first2=Adam M.|last3=Cowgill|first3=Eric S.|last4=Trexler|first4=Charles C.|last5=Niemi|first5=Nathan A.|last6=Burak Yıkılmaz|first6=M.|last7=Kellogg|first7=Louise H.|title=Subducted, detached, and torn slabs beneath the Greater Caucasus|journal=GeoResJ|date=March 2015|volume=5|pages=36–46|doi=10.1016/j.grj.2014.09.004|s2cid=56219404|doi-access=free}}</ref> and seismic tomography has mapped detached slabs beneath the Tethyan suture zone (the Alps – Zagros – Himalaya mountain belt).<ref>{{cite journal|last1=Hafkenscheid|first1=E.|last2=Wortel|first2=M. J. R.|last3=Spakman|first3=W.|title=Subduction history of the Tethyan region derived from seismic tomography and tectonic reconstructions|journal=Journal of Geophysical Research|date=2006|volume=111|issue=B8|pages=B08401|doi=10.1029/2005JB003791|bibcode=2006JGRB..111.8401H|doi-access=free}}</ref>