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 |
---|---|
Glossary | https://harryandcojewellery.com.au/blogs/glossary/ultra-high-pressure-metamorphism |
Wikipedia | http://en.wikipedia.org/wiki/Ultra-high-pressure_metamorphism |
Wikidata | https://www.wikidata.org/wiki/Q4291617 |
Knowledge Graph | https://www.google.com/search?kgmid=/m/0j_3fkn |