The Kermanshah ophiolite complex is a part of the Mediterranean–Zagros–Oman Tethyan ophiolites, located in the structural–tectonic zone of western Iran in the northern part of the Zagros main thrust. Doleritic sheeted dykes are well exposed within the ophiolite in the south of Sahneh. These dykes contain high MgO, Na2O, low TiO2 (2O5, and K2O contents, and high FeOt/MgO and LILE/HFSE ratios. Th...

The metamorphic sole rocks at the base of mantle peridotites from the Mersin ophiolite consist of amphibolites and metasedimentary lithologies. Mineral parageneses in the metamorphic sole rocks exhibit amphibolite and greenschist facies assemblages. Geothermobarometric studies based on mineral assemblages and chemical compositions of minerals indicate that average metamorphic temperature during...

We report the oxygen isotope composition of olivine and orthopyroxene phenocrysts in lavas from the main magma types at Mt Shasta and Medicine Lake Volcanoes: primitive high-alumina olivine tholeiite (HAOT), basaltic andesites (BA), primitive magnesian andesites (PMA), and dacites. The most primitive HAOT (MgO [ 9 wt%) from Mt. Shasta has olivine dO (dOOl) values of 5.9–6.1%, which are about 1%...

the halak abad prospect occurs in the northeastern part of central iran zone (sabzevar structural zone). in this investigation, geochemical evolution, age and source of part of northeastern iran magmatic arc (intrusive bodies) in halak abad area in the khorasan razavi province has been studied. the exposed rocks consist of volcanic rocks with andesite and dacite nature, limestone, plutonic rock...

Abstract The Tikar plain is located on the Cameroon Central Shear Zone. It also part of North Equatorial Pan-African Belt. formed granitoids intruded in places by mafic and intermediate dykes. dykes are essentially banded gabbros composed plagioclases, pyroxenes, amphiboles, biotites opaques. Their textures range from porphyroblastic to porphyritic. monzonites monzodiorites characterized, respe...

ABSTRACT Located in the southwest corner of Ratanakiri Volcanic Province, Wat Ocheng basalt is first known zeolite locality Cambodia. The a fine-grained, vesicular to amygdaloidal, subalkaline transitional alkaline intraplate tholeiite comprised 30% lath-like plagioclase (average: Ab51An45Or4), 35% interstitial augite Wo44En35Fs21), 25–30% zeolites after and volcanic glass, minor skeletal ulvös...

Archean greenstone belts contain low grade metamorphic volcanic sequences with localised examples of preserved original textures and relict magmatic minerals, which are invaluable for inferring processes by extension magma genesis. A feature observed in many but rare modern rocks is variolitic texture millimetre- to centimetre-sized leucocratic globular structures (varioles), mafic lavas. Model...