scholarly journals Exhuming Norwegian ultrahigh-pressure rocks: Overprinting extensional structures and the role of the Nordfjord-Sogn Detachment Zone

Tectonics ◽  
2007 ◽  
Vol 26 (5) ◽  
pp. n/a-n/a ◽  
Author(s):  
Scott M. Johnston ◽  
Bradley R. Hacker ◽  
Torgeir B. Andersen
Keyword(s):  
Ultrahigh Pressure ◽  
Detachment Zone ◽  
Extensional Structures

The role of hot electrons on ultrahigh pressure generation relevant to shock ignition conditions

2020 ◽  
Vol 37 ◽  
pp. 100892
Author(s):  
Koki Kawasaki ◽  
Yoichiro Hironaka ◽  
Yuto Maeda ◽  
Toshihiro Iwasaki ◽  
Daisuke Tanaka ◽  
...  
Keyword(s):  
Hot Electrons ◽  
Ultrahigh Pressure ◽  
Shock Ignition

scholarly journals The blueschist–eclogite transition in the Alpine chain: P–T paths and the role of slow-spreading extensional structures in the evolution of HP–LT mountain belts

2014 ◽  
Vol 615-616 ◽  
pp. 96-121 ◽  
Author(s):  
A. Vitale Brovarone ◽  
M. Picatto ◽  
O. Beyssac ◽  
Y. Lagabrielle ◽  
D. Castelli
Keyword(s):  
Slow Spreading ◽  
Mountain Belts ◽  
Extensional Structures

The role of extensional structures on experimental calderas and resurgence

2004 ◽  
Vol 129 (1-3) ◽  
pp. 199-217 ◽  
Author(s):  
V Acocella ◽  
R Funiciello ◽  
E Marotta ◽  
G Orsi ◽  
S de Vita
Keyword(s):  
Extensional Structures

Magnetic susceptibility of ultrahigh pressure eclogite: The role of retrogression

2009 ◽  
Vol 475 (2) ◽  
pp. 279-290 ◽  
Author(s):  
Haijun Xu ◽  
Zhenmin Jin ◽  
Roger Mason ◽  
Xingong Ou
Keyword(s):  
Magnetic Susceptibility ◽  
Ultrahigh Pressure

scholarly journals Acidic fluids in the Earth’s lower crust

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Vinod O. Samuel ◽  
M. Santosh ◽  
Yirang Jang ◽  
Sanghoon Kwon
Keyword(s):  
Lower Crust ◽  
Regional Scale ◽  
Ultrahigh Pressure ◽  
High Pressure And Temperature ◽  
Temperature Conditions ◽  
Regional Trends ◽  
Deep Earth ◽  
Geochemical Variations ◽  
High Grade Metamorphism

AbstractFluid flux through Earth’s surface and its interior causes geochemical cycling of elements in the Earth. Quantification of such process needs accurate knowledge about the composition and properties of the fluids. Knowledge about the fluids in Earth’s interior is scarce due to limitations in both experimental methods and thermodynamic modeling in high/ultrahigh pressure–temperature conditions. In this study, we present halogen (Cl, F) measurements in apatite grains from the mafic (metagabbro), and felsic (two-pyroxene granulite, charnockite, hornblende-biotite gneiss) rocks preserved in the Nilgiri Block, southern India. Previous experiments show that it is difficult to incorporate Cl in apatite compared to F at high pressure and temperature conditions. Based on regional trends in Cl and F content in apatite (with highest Cl content 2.95 wt%), we suggest the presence of acidic C–O–H fluids in the lower crust (~20–40 km deep) during the high-grade metamorphism of these rocks. These fluids are capable of causing extreme chemical alterations of minerals, especially refractory ones. They also have significant potential for mass transfer, causing extensive geochemical variations on a regional scale and altering the chemical and isotope records of rocks formed in the early Earth. Our findings have important relevance in understanding speciation triggered by acidic fluids in the lower crust, as well as the role of fluids in deep Earth processes.

Sign in / Sign up

Export Citation Format

Share Document