نتایج جستجو برای: quartz veins
تعداد نتایج: 29821 فیلتر نتایج به سال:
Geochemical profiles across chemically altered zones (selvages) surrounding amphibolite facies quartz+kyanite veins were investigated to determine major, minor, and trace element mass transfer and volume strain due to channelized fluid flow. The three profiles are perpendicular to two veins cutting the Wepawaug Schist, Connecticut, U.S.A., which underwent Barrovian-style metamorphism during the...
Kahang porphyry copper deposit is located in Isfahan Province, in the middle of Urmia-Dokhtar Magmatic Belt. Based on field investigations and petrography of thin sections and core samples, igneous rocks in eastern part of the deposit are divided into three types of host-rocks, source and mineralizing rocks, and post-mineralizing barren dikes. Quartzdiorite has formed more than 70 percent of th...
Tourmalinization characterizes the most pervasive alteration type in the Nezam Abad ore deposit, west-central Iran. It delineates high-temperature centers of mineralization and together with quartz and cassiterite form inner parts of the alteration halo. The composition of tourmalines plots mostly along and between the proton and alkali-deficient end members. Tourmaline in quartzdioritic host i...
Roudgaz granitoid is located in south of Bajestan. In this granitoid body, tourmaline occurred in two forms, as luxullianite and as veins of quartz-tourmaline with a 30 cm width. Based on petrography and electron microprobe analyses data, these tourmalines are schorl-dravite- foitite in composition, with a tendency toward schorl end member, and belongs to alkali and vacancies groups. In compari...
The mineralization index of Yeylaghe Gharachi, as part of Arasbaran metallogenic belt, is located about 25 km northwest of Ahar, East-Azarbaidjan Province, NW Iran. The host rocks of this index consist of composite intrusive rocks with lithologic compositions of granite, quartz monzonite, granodiorite and diorite of Oligocene and Oligo-Miocene age. The alteration zones in this area are mainly p...
Rasht Abad Cu±Au deposit is a part of the Tarom-Hashtjin metallogenic belt in the western Alborz-Azerbaijan zone. The exposed units in the area include volcanic, sub-volcanic calc-alkaline to shoshonitic rocks with Upper Eocene age and belongs to magmatic arcs setting. The most important alterations related to mineralization include low temperature silicification and sericitic alterations. Mine...
the gandy gold-base metal deposit is located in tertiary torud-chahshirin volcano-plutonic range, north of central iran. various styles of gold mineralization occur throughout the range. mineralization at gandy occurs in close spatial relation with rhyolitic domes in a caldera setting in a series of narrow brecciated veins. two mineralogically and spatially different argillic alterations have a...
Gathering and arranging specific data related to different types of geological structures in thematic interactive databases has become central for the geosciences. However, a well-defined workflow achieve this goal is currently lacking. We present Geographical Information System-based method systematic compilation, evaluation, interpretation regional structures. The demonstrated by indexing 741...
Mineralogical features of placer gold and gold-sulfide ore occurrences the Sololi river basin from uplift Olenek arch have been studied. According to typomorphic indicators, two types are distinguished. The first type is a tabular lumpy shape, often with mineral indentation imprints. inner structure represented by granulation, recrystallization, high-grade intergranular veins, shells typical in...
The W–Sn Panasqueira ore deposit is a magmatic-hydrothermal system, which includes high-grade quartz-vein type mineralization and disseminated greisen-type occurring in the upper part of two-mica granite. We investigated genetic chronological relationships between greisenization granite formation ore-bearing quartz veins by monitoring major trace elements variations quartz-white mica assemblage...
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