page_title: Pre-collisional Himalaya
section_title: Concepts
hierarchical_section_title: Pre-collisional Himalaya / Concepts
caption_attribution_description: English: Models on the reconstruction of Pre-tectonic Himalaya (curly arrows represents the direction of sedimentation), modified from Yin (2006), Myrow (2003), DeCelles (2000)
context_page_description: Pre-collisional Himalaya is a term describing the arrangement of the Himalayan rock units before the mountain-building process resulted from the collision between the continents of Asia and India. The collision began in the Cenozoic and it is a type locality of a continental-continental collision. The reconstruction of the initial configuration of the rock units and the relationship between them is highly controversial, and major concerns relate to the arrangements of the different rock units in three dimensions. Several models have been advanced to explain the possible arrangements and petrogenesis of the rock units.
context_section_description: The initial configuration of pre-collisional Himalaya can be expressed in the four following models:
  Passive continental margin model
  Crystalline axis model
  Accreted terrane model
  Carboniferous-extension model
caption: Models on the reconstruction of Pre-tectonic Himalaya (curly arrows represents the direction of sedimentation), modified from Yin (2006),[2] Myrow (2003),[16] DeCelles (2000)[17]
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