Results 61 to 70 of about 2,637,113 (187)

Twenty-five years of ultrahigh-pressure metamorphism Preface

European Journal of Mineralogy, 2010
This special issue of the European Journal of Mineralogy is dedicated to ultrahigh-pressure (UH P ) metamorphism and its increasing role in the geosciences. The term UH P metamorphism refers to those rock types that were formed or embedded in shallow levels of the continental or oceanic lithosphere and subsequently experienced PT -conditions within or ...
Hans-Peter Gilotti Schertl, Simon J. Cuthbert, Alexei L. Perchuk   +2 more
openaire   +1 more source

Trace-element transport during subduction-zone ultrahigh-pressure metamorphism: Evidence from western Tianshan, China

, 2012
Subduction-zone metamorphism is considered to be a major chemical filter for both the arc magmatism and mantle compositional heterogeneity. To understand the element transport during this process, we conducted a petrographic and geochemical study of the ...
Lavis, Shaun, Xiao, Y., Davidson, J., Wang, H., Niu, Y., Li, H., Pearce, Julian A.   +6 more
core   +1 more source

Variable Sr Diffusion and Implications for Rb–Sr Biotite Geochronology

Journal of Metamorphic Geology, Volume 44, Issue 6, Page 417-439, July 2026.
ABSTRACT The rubidium–strontium (Rb–Sr) system has a long pedigree as a geochronological tool that relies on the application of an isochron approach. In particular, biotite contains strongly radiogenic Rb–Sr isotopes, and thus can yield meaningful crystallisation or cooling ages via this approach. However, the response of the Rb–Sr system in biotite to
Riley Rohrer, Christopher L. Kirkland, Hugo Olierook, Tim Johnson, Katy Evans   +4 more
wiley   +1 more source

On ultrahigh-temperature crustal metamorphism

, 2008
Ultrahigh-temperature (UHT) metamorphism is the most thermally extreme type of crustal metamorphism, with the crust capable of withstanding temperatures ≥ 900 °C.
Kelsey, D.
core   +1 more source

Geochemical and Isotopic Constraints on Long‐Lived Source Enrichment and Mantle Evolution in Paleoproterozoic Cratonic Lamprophyres

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 6, June 2026.
Abstract The cratonic lithospheric mantle records complex metasomatic processes and is frequently tapped by alkaline magmatism, offering a unique opportunity to trace the progressive evolution of the mantle. In the present contribution, we investigate a newly identified calc‐alkaline lamprophyre field from the Neoarchean Jonnagiri Schist Belt, Eastern ...
Sourav Naskar, Rohit Pandey, Nils Björn Baumann, N. V. Chalapathi Rao, George Mathew, J. Amal Dev, J. K. Tomson   +6 more
wiley   +1 more source

Could tectonic overpressure cause ultrahigh-pressure metamorphism?

Chinese Science Bulletin, 1999
Could ultrahigh-pressure metamorphic rocks be caused, at depth of 32 km, by tectonic overpressure resulting from differential stress? The differential stress is limited by rock strength, which depends on strain rate and temperature. Therefore, tectonic overpressure could not go beyond 1 GPa, and could not cause the uitrahigh-pressure metamorphism.
Qingchen Wang, Jingbo Liu, Bolin Cong
openaire   +1 more source

Jadeite in Continental Subduction: Its Preservation, Breakdown and Pseudomorphic Replacement in Erzgebirge UHP Gneisses

Journal of Metamorphic Geology, Volume 44, Issue 5, Page 376-393, June 2026.
ABSTRACT The absence of jadeite in regions where subduction of continental crust has been documented by other high‐pressure (HP) or ultrahigh‐pressure (UHP) minerals is striking. This study presents only the second discovery of jadeite in the crystalline rocks of the Erzgebirge, a region known for its occurrences of microdiamond, coesite and omphacite ...
Ondrej Lexa, Martin Racek, Petr Jeřábek, Benjamin Paddon   +3 more
wiley   +1 more source

Ultrahigh Pressure Metamorphism: Cambridge Topics in Petrology

Eos, Transactions American Geophysical Union, 1996
The field of ultra‐high pressure metamorphism (UHPM) emerged only 12 years ago when microscopic relics of coesite were found in crustal rocks that had been metamorphosed during subduction related to continental collision. Coesite‐bearing metamorphic rocks were soon found elsewhere, and then metamorphic microdiamonds were discovered.
openaire   +1 more source

Source and mode of the Permian Panjal Trap magmatism: Evidence from zircon U-Pb and Hf isotopes and trace element data from the Himalayan ultrahigh-pressure rocks

, 2016
We present an integrated study of LA-ICP-MS U-Pb age, Hf isotopes, and trace element geochemistry of zircons from the Himalayan eclogites (mafic rocks) and their host gneisses (felsic rocks) from the Kaghan Valley in Pakistan in order to understand the ...
Khan, Tahseenullah, Chung, Sun-Lin, Rehman, Hafiz Ur, Yamamoto, Hiroshi O´Brien, Lee, Hao-Yang   +4 more
core   +1 more source

High‐Pressure Elasticity of CAS Phase and Its Implications for the Fate of Subducted Anorthosite Crust

Geophysical Research Letters, Volume 53, Issue 10, 28 May 2026.
Abstract The CAS phase (CaAl4Si2O11) is a key phase formed in subducted silica‐alumina rich crustal and sedimentary materials under the mantle transition zone conditions. In this study, its elastic properties were investigated using first‐principles calculations up to 30 GPa.
Baoyun Wang, Meisu Xiang
wiley   +1 more source