نتایج جستجو برای: alkali feldspar
تعداد نتایج: 17765 فیلتر نتایج به سال:
The Mamzar granitoid pluton is located in the Kerman Province and structurally in southeast of Urumieh-Dokhtar magmatic zone. Based on petrographic studies, the granitoid consist of four rock type of diorite, tonalite, granodiorite and monzogranite. They are mainly composed of plagioclase (andesine), alkali-feldspar (orthoclase), quartz, amphibole (magnesiohornblende), biotite and clinopyroxene...
Based on the field observations host rock of tourmaline nodules in the Dehgah and Sarsakhti area are acidic dikes (Aplite) and monzogranite respectively. In these areas, nodules composed of tourmaline, quartz, alkali-feldspar, but leuco minerals component in Dehgah nodule are less than Sarsakhti area. The negative anomaly of Eu, enrichment in the light REE (LREE), decrease of HREE, and fractio...
The Natanz plutonic complex is located in north of Isfahan and in the Orumieh – Dokhtar magmatic belt. Based on petrographic studies, the Natanz complex is composed of six rock types, which are granodiorite, quartz-diorite, diorite, gabbro, quartz-monzonite and granite monzogranit. The intrusive rocks of Natanz are related to the calc-alkaline magmatic series and I-type granitoids. These rocks ...
Introduction: Shock modification of feldspar has been documented and experimentally reproduced in many studies since the recognition of maskelynite in Shergotty (1). Experimentally shocked feldspar samples have been well studied using chemical and crystallographic techniques (2-4). The crystallographic, site-specific characterization of major and minor elements is less well documented. We prese...
شیمی کانی و بررسی نقش آلومینیوم کل بیوتیت برای تشخیص نوع کانیزایی در تودههای نفوذی محور کرج-طالقان
The intrusive bodies of Karaj-Taleghan axis in Central Alborz constitute, intruded the pyroclastic rocks of Karaj Formation in the form of sill, lopolith, stock and plug with distict distribution. Based on microscopic studies, these bodies have similar lithological composition and include olivine gabbro, olivine monzodiorite, olivine monzonite, pyroxene monzonite with felsic dikes of syenite. T...
Tertiary igneous rocks of Shurab area in eastern part of Lut block include pyroxene andesite, andesite, trachy andesite, quartz andesite, diorite, quartz diorite and porphyric quartz monzodiorite. Plagioclase, hornblende, pyroxene, biotite and quartz are common minerals and alkali feldspar, opaque, sphene, apatite, tourmaline and zircon exists as minor minerals. Propylitization, chloritization,...
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...
The Kashmar granitoid (43.5–42.4 Ma) forms an extensive part of iron–oxide type magmatic belt in northern side of the Doruneh Fault. It includes plutons of tonalite, granodiorite, granite and alkali feldspar granite which are metaluminous (ASI ≤ 1) in nature. They contain dominantly felsic minerals, representing I–type granites with low–temperature and low–pressure characteristics. According to...
This work deals with the petrographic and geotechnical characterization of rocks from N'goura massif focus on their use in civil engineering. The study area is located central southern Chad, about 205km to north N'Djamena. monzogranitic two micas. outcrop as blocks, slabs balls displaying fine, medium coarse grained minerals. Monzogranite composed 34% quartz, 32% alkali feldspar...
Introduction: Type 3 ordinary chondrites display a wide variety of metamorphic grades, ranging from little metamorphosed type-3.0 chondrites up to nearly equilibrated type 3.9's. Researchers commonly assume that pristine-looking chondrules found in the lowest petrological subtypes have been unaffected by metamorphic processes, and can be used to constrain pre-accretionary processes. Last year, ...
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