Results 51 to 60 of about 3,014 (216)

Melt–Rock Interaction Experiments Reveal Rapid Microstructural and Chemical Changes at Lower Crustal Conditions

Journal of Metamorphic Geology, Volume 43, Issue 4, Page 341-358, May 2025.
ABSTRACT The reactive flow of melt through the mantle or crust triggers chemical disequilibrium, driving reactions that significantly alter the mineral assemblages and physical properties of host rocks. However, the degrees of chemical difference required to initiate these reactions and their timescale remain poorly understood.
Robyn L. Gardner, Nathan R. Daczko, Sandra Piazolo, John Adam, Uvana Meek   +4 more
wiley   +1 more source

Sr-Nd Systematics and REE distribution in the type magnesite deposits in Lower Riphean of South Urals province

Литосфера, 2016
The geochemistry and REE of magnesite and host carbonate rocks of two Lower Riphean deposits of the South Urals province (Satka and Ismakaevo ore fields) confirm the metasomatic nature of the magnesite.
M. T. Krupenin, A. B. Kuznetsov, G. V. Konstantinova   +2 more
doaj   +2 more sources

Fluid‐induced processes: metasomatism and metamorphism [PDF]

Geofluids, 2010
Geofluids (2010) 10, 254–269AbstractMetamorphism and metasomatism both involve the reequilibration of mineral assemblages due to changes in pressure, temperature and/or chemical environment. Both processes involve material transport but on different length scales, so every metamorphic reaction is metasomatic on a local scale.
Putnis, Andrew, Austrheim, H.
openaire   +4 more sources

The Impact of Mélange Formation on the Rheology and H2O Budget of the Subduction Zone Interface, With Implications for Diapir Nucleation

Geophysical Research Letters, Volume 52, Issue 7, 16 April 2025.
Abstract At the subduction zone interface, a combination of mechanical deformation and (fluid‐mediated) chemical mixing of oceanic crust, sediment and mantle lithologies yields heterogeneous mélange lithologies. These mélanges have compositions and metamorphic mineral assemblages dissimilar to their endmember source lithologies, resulting in a ...
Benjamin Z. Klein, Mark D. Behn
wiley   +1 more source

Apatite: A Fingerprint for Metasomatic Processes

Elements, 2015
Apatite is a superb mineral by which to investigate the nature of fluids that have passed through and altered a rock (metasomatic processes). Its ubiquity allows it to act as a reservoir for P, F, Cl, OH, CO2, and the rare earth elements. It is also a powerful thermochronometer and can be chemically altered by aqueous brines (NaCl–KCl–CaCl2–H2O), pure ...
openaire   +5 more sources

Contemporaneous Triassic Calc‐Alkaline Volcanism and Fast‐Spreading Magmatism in the Western Tethys: Implications for the Eastern Mediterranean Palaeogeographic Evolution

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 4, April 2025.
Abstract Triassic calc‐alkaline volcanics that are mainly exposed in the Hellenides—Dinarides orogen, as well as eastwards in the Afyan Zone, are considered to constrain the petrogenetic mechanisms that led to their formation, and to unravel the geodynamic processes that occurred in the western Tethys, related to the NW Gondwana (Apulia) promontory and
Petros Koutsovitis, Konstantinos Soukis, Sotirios Kokkalas, Andreas Magganas, Theodoros Ntaflos, Yirang Jang, Sanghoon Kwon, Christos Karkalis, Petros Petrounias, Harilaos Tsikos, Paul Mason   +10 more
wiley   +1 more source

How Cratonic Roots Survive With Weak Mid‐Lithosphere Discontinuities

Geophysical Research Letters, Volume 52, Issue 6, 28 March 2025.
Abstract The stability of cratons has long been attributed to their neutral buoyancy and strong roots. However, recent seismic studies have revealed widespread mid‐lithospheric discontinuities (MLDs) within cratonic roots. Previous studies, based on geophysical and xenolith evidence, mainly suggest that MLDs are formed through metamorphic processes and
Qionghua Guo, Huilin Wang, Honglei Liu
wiley   +1 more source

Geochemistry and Geochronology of A‐Type Intermediate‐Felsic Rocks in NW Himalaya, Pakistan: Implications for Petrogenesis and Tectonic Evolution of Northern Gondwana

Geochemistry, Geophysics, Geosystems
Igneous intrusives in northern Pakistan can provide valuable insights into pre‐Himalayan metaluminous to peraluminous magmatism along the northern boundary of the supercontinent Gondwana and its potential tectonic significance.
Musa Khan, Huan Li, Thomas J. Algeo, Asad Khan, Michael W. Förster, Zaheen Ullah   +5 more
doaj   +1 more source

Avanços na caracterização das estruturas geológicas em subsuperfície da provincia uranífera lagoa real (ba) a partir de dados aerogeofísicos [PDF]

arXiv, 2011
In this work we present results of a recent re-evaluation of airborne magnetometric and gamma spectrometric data of the uranium province of Lagoa Real (BA), acquired under the project S\~ao Timoteo. The main purpose is to provide new insights into the magnetic and radiometric characteristics of the structural units in this region, derived from a ...
arxiv  

External Metasomatism associated with Serpentine [PDF]

Nature, 1954
AFTER finding in Turkey that many geosynclinal serpentines appear to be submarine lava flows1, we re-examined in Ayrshire the only known exposure of an actual contact between the Ballantrae serpentine and associated spilites. The evidence is difficult to disentangle, but it proved beyond doubt that the serpentine is earner than the particular spilite ...
W. J. McCALLIEN, E. B. Bailey
openaire   +2 more sources