Results 31 to 40 of about 5,714 (221)

Variable Sr Diffusion and Implications for Rb–Sr Biotite Geochronology

Journal of Metamorphic Geology, EarlyView.
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

Low–pressure metamorphism of mafic granulites in the Chinese Altay orogen, NW China: P–T path, U–Pb ages and tectonic implications

Solid Earth Sciences, 2020
Mafic granulites occur as massive lenses within host paragneisses at Wuqiagou area in the southern Chinese Altay orogen. They comprise a suite of fine–grained and coarse–grained mafic granulites, both characterized by an assemblage of orthopyroxene ...
Zhao Liu, Laixi Tong, Omar Bartoli, Yi–Gang Xu, Xiaolong Huang, Chao Li   +5 more
doaj   +1 more source

Reaction‐Driven Development of Fine‐Grained Plagioclase Networks Influences the Rheology of the Crust in the Bergen Arcs, Norway

Journal of Metamorphic Geology, EarlyView.
ABSTRACT In the middle to lower continental crust, mineral reactions can play a key role in controlling rheological behaviour by generating fine‐grained, mechanically weak domains. In granulite‐facies rocks from Krossøy (Bergen Arcs, Norway), we document how garnet breakdown produced interconnected networks of orthopyroxene + plagioclase ± spinel that ...
Lorena H. Filiberto, Håkon Austrheim, José Alberto Padrón‐Navarta, Andrew Putnis, Christine V. Putnis   +4 more
wiley   +1 more source

Age and metamorphic conditions of the granulites from Capral-Jegessky synclinoria, Anabar shield

Записки Горного института, 2018
The paper presents the results of the isotope, geochemical and thermobarometric study of plagio-crystalline schist containing in the Upper Anabar series of the Anabar Shield.
L. Yu. Sergeeva, A. V. Berezin, N. I. Gusev, S. G. Skublov, A. E. Mel'nik   +4 more
doaj   +1 more source

Feldspar Albitization With Implications for Reservoir Quality Evolution of Eocene Turbidite Sandstones in Offshore Espírito Santo Basin, Eastern Brazil

Journal of Petroleum Geology, EarlyView.
ABSTRACT The diagenetic albitization of plagioclase and K‐feldspar grains is a transformative process that significantly alters sandstone's detrital composition and formation water chemistry, impacting reservoir quality. In this study, Eocene turbidite sandstones from the offshore Espírito Santo Basin, Brazil, were investigated to elucidate the role of
Eveline E. Zambonato, Luiz F. De Ros, Howri Mansurbeg   +2 more
wiley   +1 more source

LifeMet: Report on the 2024–2025 meteorite recovery expedition in Dronning Maud Land, Antarctica for the study of microbe–meteorite interactions

Meteoritics &Planetary Science, EarlyView.
Abstract Since the discovery of nine meteorites near the Yamato mountains in 1969, Antarctica has been recognized as a superb location for meteorite recovery. While Antarctic recovery expeditions prioritize meteorite preservation for mineralogical and planetary studies, meteorites are not typically collected for biological applications.
Rachael Lappan, Rachel S. Kirby, Andrew G. Tomkins   +2 more
wiley   +1 more source

3D Model of Pyroxenic Granulite

, 2021
CATEGORÍA: Elemento Petrográfico CLASIFICACIÓN: Granulita Piroxenica ADQUISICIÓN: Donación FECHA DE REGISTRO: 22-09-2022CATEGORY: Petrographic Element CLASSIFICATION: Pyroxenic Granulite ACQUISITION: Donation REGISTRATION DATE: 22-09 ...
Gómez Cruz, Arley de Jesús, Ríos Cardona, John Jairo, Quiceno Colorado, July, Marín Rámirez, Lina Marcela   +3 more
core  

Phase equilibria constraints on the stability of garnet in mafic granulite: An example from Karimnagar granulite terrain, Eastern Dharwar Craton, India

Evolving Earth
Phase equilibria modeling becomes a widely accepted tool to constrain the P-T conditions experienced by the metamorphic terrain because of its advantage over the earlier methods e.g., conventional methods and petrogenetic grids.
Praveen Chandra Singh, Divya Prakash
doaj   +1 more source

Ductile Extrusion Triggered by Continental Collision in NE Brazil

Terra Nova, EarlyView.
ABSTRACT The Borborema Province in northeastern Brazil hosts one of the world's largest strike‐slip shear zone networks, active during the late Neoproterozoic assembly of West Gondwana. Whether these shear zones initiated during active continental collision or as a post‐orogenic response to far‐field stresses remains debated.
L. R. Tesser, C. E. Ganade, C. R. Cioffi, J. B. Forshaw, M. Hueck, E. Celis, M. A. S. Basei   +6 more
wiley   +1 more source

MECHANISMS OF MANTLE‐CRUST INTERACTION AT DEEP LEVELS OF COLLISION OROGENS (CASE OF THE OLKHON REGION, WEST PRIBAIKALIE)

Геодинамика и тектонофизика, 2017
In the Chernorud granulite zone in the Olkhon region of West Pribaikalie, we studied gabbro‐pyroxenites composing tectonic plates (Chernorud, Tonta) and synmetamorphic intrusive bodies (Ulan‐Khargana), as well as nu‐ merous disintegrated boudins and ...
A. G. Vladimirov, A. S. Mekhonoshin, S. V. Khromykh, E. I. Mikheev, A. V. Travin, N. I. Volkova, T. B. Kolotilina, Yu. A. Davydenko, E. V. Borodina, V. V. Khlestov   +9 more
doaj   +1 more source