Skip to content


Your cart is empty

Article: Ultra-high-pressure metamorphism

Ultra-high-pressure metamorphism

Definition and Characteristics of Ultra-high-pressure Metamorphism

  • Metamorphism of rocks at pressures ≥27kbar (2.7GPa) to stabilize coesite
  • Diagnostic minerals include coesite and diamond
  • Diagnostic mineral assemblage includes magnesite + aragonite
  • Mineral compositions can also be used for identification
  • Ultra-high-pressure rocks often exhibit unique textures and mineral assemblages
  • Ultra-high-pressure metamorphism involves the formation of rocks at depths greater than 100 km
  • Rocks undergoing ultra-high-pressure metamorphism experience high temperatures and pressures

Tectonic Settings and Mechanisms of Ultra-high-pressure Metamorphism

  • Ultra-high-pressure metamorphism occurs in subduction zones and during collision of continental plates
  • Slab break-off and subduction channel processes contribute to ultra-high-pressure metamorphism
  • Exhumation of ultra-high-pressure rocks is driven by factors such as slab rollback and bending-related variations in tectonic pressure
  • Numerical models and physical experiments help understand the tectonic processes associated with ultra-high-pressure metamorphism

Examples of Ultra-high-pressure Metamorphic Terranes

  • The Dabie Shan orogen in China
  • The Western Alps
  • The Pamir Mountains
  • The South Caledonides
  • The Pakistan Himalaya
  • The Western Gneiss Region in Norway
  • The Sulu ultrahigh-pressure terrane in eastern China

Exhumation Processes and Mechanisms of Ultra-high-pressure Rocks

  • Exhumation refers to the process of bringing deeply buried rocks to the Earth's surface
  • Syn-collisional rock exhumation and associated normal faulting contribute to exhumation
  • The hydration of deep slabs and the role of microplate rotation are proposed exhumation mechanisms
  • Numerical models and thermomechanical simulations help understand the processes involved in the exhumation of ultra-high-pressure rocks

Significance and Implications of Ultra-high-pressure Metamorphism

  • Ultra-high-pressure metamorphism provides insights into deep Earth processes and plate tectonics dynamics
  • The study of ultra-high-pressure rocks helps reconstruct ancient tectonic events and understand the evolution of mountain belts
  • The presence of ultra-high-pressure minerals in exhumed rocks indicates extreme conditions
  • The formation and exhumation of ultra-high-pressure rocks have implications for the recycling of continental crust and the formation of ore deposits
  • Understanding ultra-high-pressure metamorphism contributes to our knowledge of Earth's geological history and the processes that shape our planet

Ultra-high-pressure metamorphism Data Sources

Reference URL
Knowledge Graph

Read more

Udachnaya pipe

Discovery and Location Discovered on 15 June 1955, two days after the discovery of the diamond pipe Mir by Soviet geologist Vladimir Shchukin and his team. The nearby settlement of Udachny is named...

Read more


Names and Properties of Turquoise The word 'turquoise' dates back to the 17th century and is derived from the Old French 'turquois' meaning Turkish. The gemstone was first brought to Europe from Tu...

Read more