Results 71 to 80 of about 729 (236)

Mineral chemistry and geothemobarometry of mantle harzburgites in the Eastern Metamorphic Complex of Khoy ophiolite -NW Iran

Journal of Economic Geology, 2017
Introduction Khoy ophiolite at the global scale is in the middle part of the Alp-Himalaya orogenic belt and it is extended over 3900 Km2 which indicates remnant Neotethys oceanic lithosphere in the Mesozoic era (Kananian et al., 2010). In this paper, in
Morovvat Faridazad
doaj   +1 more source

Genesis and petrology of Late Neoproterozoic pegmatites and aplites associated with the Taba metamorphic complex in southern Sinai, Egypt

Geologica Acta, 2016
We present new field, petrographical, mineralogical and geochemical data from late Neoproterozoic pegmatites and aplites in southern Sinai, Egypt, at the northernmost limit of the Arabian-Nubian Shield.
K.M. ABDELFADIL, P.D. ASIMOW, M.K. AZER, H.A. GAHLAN   +3 more
doaj  

Post-Hercynian ultrahigh-temperature tectono-metamorphic evolution of the Middle Atlas lower crust (central Morocco) revealed by metapelitic granulite xenoliths [PDF]

Solid Earth
The study of metapelitic sillimanite- and garnet-bearing granulite xenoliths brought to the surface by the basanite of the 650 ka Tafraoute maar shed new light on the lower crust of the Tabular Middle Atlas (Morocco).
A. El Maz, A. Vauchez, J.-M. Dautria
doaj   +1 more source

Petrography and mineral chemistry of wehrlites in contact zone of gabbro intrusions and mantle peridotites of the Naein ophiolite

Journal of Economic Geology, 2014
Introduction Geological background Ophiolites have played a major role in our understanding of Earth’s processes ranging from seafloor spreading, melt evolution and magma transport in oceanic spreading centers, and hydrothermal alteration and ...
Farhad Ghaseminejad, Ghodrat Torabi
doaj  

Petrology and geochemistry of Late Proterozoic hornblende gabbros from southeast of Fariman, Khorasan Razavi province, Iran

Journal of Economic Geology, 2015
Introduction Hornblende-bearing gabbroic rocks are quite common in subduction-related magmatic suites and considered to represent magmatic differentiation process in arc magmas (Heliker, 1995; Hickey-Vargas et al., 1995; Mandal and Ray, 2012).
Seyed Masoud Homam
doaj  

Petrogenesis of melanite-garnets in monzodiorites from SW of Jandaq (NW of Central-East Iranian Microcontinent)

Journal of Economic Geology
The Godar-e-Siah Eocene monzodiorite stock is located in the southwest of the Jandaq area (NE of Isfahan) and northwest of the Central-East Iranian Microcontinent (CEIM). The main minerals in these monzodiorites are plagioclase, K-feldspar, clinopyroxene,
Ahmad Jamshidzaei, Khadijeh Khalili, Ghodrat Torabi   +2 more
doaj   +1 more source

Petrología y Estructura del Complejo Ígneo-Metamórfico Aluminé, Provincia de Neuquén, Argentina Petrology and Structure of the Aluminé Igneous-Metamorphic Complex, Neuquén province, Argentina

Andean Geology, 2011
En la presente contribución se dan a conocer los resultados parciales de un estudio de detalle de los eventos magmáticos, metamórficos y tectónicos acaecidos en el Complejo Ígneo-Metamórfico Aluminé (CIMA). Se define como CIMA al conjunto de rocas ígneas
Ivana A Urraza, Laura E Grecco, Sergio H Delpino, Mónica L Arrese, Carlos W Rapela   +4 more
doaj  

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

Progressively Fenitised Schist and Carbonatitic Clasts From a Metasomatic Aureole Beneath the Alkalic Dunedin Volcano, Otago, New Zealand

New Zealand Journal of Geology and Geophysics, Volume 69, Issue 2, June 2026.
Clasts of albite‐porphyroblastic quartzofeldspathic schist, derived from the Otago Schist basement, occur within the Port Chalmers Breccia, a diatreme at the centre of the Dunedin stratovolcano, New Zealand. Schists have undergone varying degrees of replacement reactions (at temperatures of 300° to >500°C) producing hornfelses, with Ca‐ and K‐enriched ...
Alan F. Cooper
wiley   +1 more source

Supercritical fluid in deep subduction zones as revealed by multiphase fluid inclusions in an ultrahigh-pressure metamorphic vein. [PDF]

Proc Natl Acad Sci U S A, 2023
Jin D, Xiao Y, Tan DB, Wang YY, Wang X, Li W, Su W, Li X.   +7 more
europepmc   +1 more source