نتایج جستجو برای: basic dykes
تعداد نتایج: 272559 فیلتر نتایج به سال:
Delbar metamorphic complex is located in 130 Km south of Shahrood (Biarjmand area) in Northern margin of the central Iran zone. The varied metamorphic rocks including meta-psammite, meta-greywacke, meta-pelite, marble and amphibolite and mylonitized granites and leucogranites intrusions are exposed in this complex. The field and petrography evidences indicated the evolutions resulted of the inc...
The Tertiary volcanic rocks in the north and west of Birjand are dacite; andesite, basaltic andesite, trachyandesite and rhyolite.They belong to calc- alkaline from magmatic series. Mineralogcal, petrographcal and geochemical evidence show that they have formed in active continental margins. Most andesites and dacites are appeared as volcanic domes or subvolcanic dykes that injected older units...
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 Porphyry-type deposits are the world’s main source of copper and molybdenum provide a large proportion gold other metals. However, mechanism by which mineralising fluids extracted from magmas transported upwards into ore-forming environment is not clearly understood. Here we use field, micro-textural geochemical techniques to investigate field relationships samples circa 8 km deep cros...
The Neoproterozoic rocks of the Nakora Ring Complex (NRC) consist three phases (Extrusive, Intrusive and Dyke) that are based on detailed geological mapping (contact relationship, mode occurrence, position xenolith, flows, dykes veins) their stratigraphic position. NRC consists mainly acid volcanic besides minor amount basic with intermediate calc-alkaline to tholeiitic affinities occurs in for...
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