Results 101 to 110 of about 6,691 (288)

Picroilmenites in Yakutian kimberlites: variations and genetic models [PDF]

Solid Earth, 2014
Major and trace element variations in picroilmenites from Late Devonian kimberlite pipes in Siberia reveal similarities within the region in general, but show individual features for ilmenites from different fields and pipes.
I. V. Ashchepkov, N. V. Alymova, A. M. Logvinova, N. V. Vladykin, S. S. Kuligin, S. I. Mityukhin, H. Downes, Yu. B. Stegnitsky, S. A. Prokopiev, R. F. Salikhov, V. S. Palessky, O. S. Khmel'nikova   +11 more
doaj   +1 more source

Interaction between protokimberlite melts and mantle lithosphere: evidence from mantle xenoliths from the Dalnyaya kimberlite pipe, Yakutia (Russia) [PDF]

, 2017
The Dalnyaya kimberlite pipe (Yakutia, Russia) contains mantle peridotite xenoliths (mostly lherzolites and harzburgites) that show both sheared porphyroclastic (deformed) and coarse granular textures, together with ilmenite and clinopyroxene megacrysts.
Afanasiev, Agashev, Agashev, Amshinsky, Arndt, Ashchepkov, Ashchepkov, Ashchepkov, Ashchepkov, Ashchepkov, Ashchepkov, Ashchepkov, Ashchepkov, Ashchepkov, Bedard, Blundy, Boyd, Boyd, Brett, Brey, Burgess, Bussweiler, Bussweiler, Cas, DePaolo, Doucet, Evans, Finnerty, Fulmer, Genshaft, Gibson, Girnis, Giuliani, Goncharov, Green, Gregoire, Haggerty, Hart, Harte, Hauri, Howarth, Höfer, Imai, Ionov, Ionov, Ionov, Ishimaru, Karato, Kargin, Katayama, Kennedy, Klein-Ben David, Klemme, Kohler, Konzett, Kopylova, Kostrovitsky, Krogh, Kuzyura, Lavrent'ev, Lazarov, Logvinova, McCammon, McCammon, McDonough, McGregor, Mitchell, Moore, Moore, Nickel, Nickel, Nimis, O'Neill, O'Neill, Pearson, Peslier, Pokhilenko, Pokhilenko, Pokhilenko, Pokhilenko, Rodionov, Rodionov, Rodionov, Rudnick, Sazonova, Smelov, Sobolev, Sobolev, Sobolev, Sobolev, Sobolev, Sobolev, Solov'eva, Spetsius, Spetsius, Stagno, Stagno, Taylor, Tuff, Wells, Wu, Zack   +101 more
core   +2 more sources

A New UHP‐HP Tectono‐Metamorphic Architecture for the Southern Dora‐Maira Massif Nappe Stack (Western Alps) Based on Petrological and Microstructural Evidence

Journal of Metamorphic Geology, Volume 43, Issue 4, Page 359-383, May 2025.
ABSTRACT The southern Dora‐Maira Massif, where coesite was first discovered 40 years ago, is among the most studied and better known example of high/ultra‐high‐pressure (HP/UHP) terranes. Previous to this study, the Polymetamorphic Basement Complex of the southern Dora‐Maira Massif has been defined as a nappe stack consisting of three juxtaposed ...
Chiara Groppo, Simona Ferrando, Fabrizio Tursi, Franco Rolfo   +3 more
wiley   +1 more source

A Clockwise P-T Path from the Variscan Basement of the Tisza Unit, Pannonian Basin, Hungary [PDF]

, 1999
The polymetamorphic basement of the Tisza Unit forms a detached fragment of the Variscan European foreland of the Neotethyan realm. A clockwise evolution path of a gneiss-amphibolite complex of the Tisza Unit was reconstructed, investigating the ...
G. Nagy, P. Arkai, P. Horvath
core   +1 more source

The validity of plagioclase-melt geothermometry for degassing-driven magma crystallization [PDF]

, 2013
Any quantitative interpretation of the formation conditions of igneous rocks requires methods for determining crystallization temperature. Accurate application of such thermobarometers relies on the attainment of equilibrium in the system to be studied ...
Bernhardsson, Katarina,, Eriksson, Jörgen,, Henning, Karin, Hertil-Lindelöw, Camilla, Lawrence, David, Lund University., Lund University., Neidenmark, Thomas, Pelling, Maja, Svensson, Aina   +9 more
core   +1 more source

Thermobarometry of Diamond Inclusions: Evidence Mantle Evolution beneath Siberian Craton and Archean Cratons Worldwide.

, 2021
Thermobarometric calculations for mineral inclusions in diamonds provide a systematic comparison of PTXFO2 conditions for different cratons worldwide, using a database of 4440 mineral EPMA analyses.
I. Ashchepkov, A. Logvinova, Z. Spetsius, H. Downes   +3 more
semanticscholar   +1 more source

Garnet as a Proxy for Deciphering Polymetamorphic Histories: An Example From the Sanandaj‐Sirjan Zone of Iran

Geological Journal, Volume 60, Issue 4, Page 793-806, April 2025.
This work documents how the texture and composition of metamorphic garnet represent a valuable petrological archive capable of deciphering complex thermobaric histories. ABSTRACT In the central sector of the Sanandaj‐Sirjan zone of Iran, the Triassic‐to‐Jurassic ‘Hamedan Phyllites’ metamorphic complex shows a polymetamorphic evolution characterised by ...
Mirmohammad Miri, Federico Lucci, Ali A. Sepahi, Mohammad Maanijou, John Charles White   +4 more
wiley   +1 more source

Preservation of Garnet Growth Zoning and the Duration of Prograde Metamorphism [PDF]

, 2017
Chemically zoned garnet growth and coeval modification of this zoning through diffusion are calculated during prograde metamorphic heating to temperatures of up to 850°C.
Caddick, Mark J., Konopásek, Jiří, Thompson, Alan B.   +2 more
core  

Seismic Imaging of the Reykjanes Peninsula, Iceland: Crustal‐Scale Context of Geothermal Areas and Ongoing Volcano‐Tectonic Unrest

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 4, April 2025.
Abstract Volcanic and seismic unrest on the Reykjanes Peninsula in SW Iceland that started in late 2019 after ∼800 years of quiescence has drawn wide interest to this on‐land extension of the Mid‐Atlantic spreading ridge. Here, we use seismic data collected across the larger Peninsula region, covering six volcanic systems and associated high ...
J. Jenkins, T. Greenfield, R. S. White, J. Maclennan, E. Á. Gudnason, T. Ágústsdóttir, N. Rawlinson, A. Obermann, T. Dahm, C. Milkereit, A. Rahimi Dalkhani, J. Fone, G. P. Hersir, J. Doubravova   +13 more
wiley   +1 more source

Quantitative Microstructural Analysis of Exhumed Epidote‐Amphibolites and Plate Interface Rheology in Warm Subduction Zones

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 4, April 2025.
Abstract Epidote‐amphibolites form along the plate interface during subduction infancy and are stable in warm, mature subduction zones that generate slow earthquakes. Epidote‐amphibolite rheology therefore likely influences plate‐scale processes during plate boundary formation and grain‐scale processes that give rise to slip transients.
Laurens H. Kleijbeuker, Hamed Amiri, Maartje F. Hamers, Alissa J. Kotowski   +3 more
wiley   +1 more source