نتایج جستجو برای: alkali feldspar
تعداد نتایج: 17765 فیلتر نتایج به سال:
One of the metamorphic rocks in the Nain ophiolitic mclange is skarn which is fonned during the contact metamorphism of intrusive tonalites with their neighboring limestones and carbonate parts of banded cherts. Minerals of these skarns consist of carbonate (calcite). clinopyroxene (diopside). garnet (grossular-andradite). wollastonite, sphene and epidote. Also tonalites contain quartz, pl...
Concentric layers of weathered materials around core-stones show the porphyritic biotite granite to experience sequential, but gradational, changes in visible features, textures and mineralogy as it transforms from ‘rock’ into ‘soil’. The start with opening-up grain boundaries micro-cracks (stage 1) followed by their dark brown staining 2) subsequent alteration (to sericite clay minerals) groun...
[1] Textural and compositional analyses using Chemistry Camera (ChemCam) remote microimager and laser-induced breakdown spectroscopy (LIBS) have been performed on five float rocks and coarse gravels along the first 100 m of the Curiosity traverse at Bradbury Rise. ChemCam, the first LIBS instrument sent to another planet, offers the opportunity to assess mineralogic diversity at grain-size scal...
The basement rocks encountered in exploratory boreholes drilled for exploration and evaluation of coal deposits in Thar Parkar district, Sindh Pakistan have formed the basis for present studies. The basement complex was penetrated through eighteen boreholes at drill depth range from 112 to 279 meters. These rocks were identified in field as Pink and Grey Granites.. The basement rocks are of Ign...
The Jebal-E-Barez Oligocene granitoid is located in the southeastern Bam, and in the southeastern part of the Urumieh-Dokhtar Magmatic Assemblage. Based on petrographic studies, this granitoid includes tonalite, granodiorite, granite and alkaligranite, which are composed of quartz, plagioclase, amphibole, biotite and alkali feldspar. The albite of plagioclase ranges from 38.38 to 67.26 percent,...
Kuh e-Dom intrusion, located at the northeast of Ardestan, consists of granodiorite and diorite. The granodiorites have been intruded by various basic dikes. Plutonic rocks are mainly composed of plagioclase, biotite, amphibole, pyroxene, alkali-feldspar and quartz. Based on microprobe analysis, the biotite is classified as magnesiobiotites which typically occur at calc-alkaline orogenic igneou...
Geochemical Aspects of Na-Metasomatism in Sargaz Granitic Intrusion (South of Kerman Province, Iran)
The Sargaz granitic intrusion has been emplaced in Sargaz ophiolitic suite, south-east of Sanandaj-Sirjan metamorphic zone, south of Kerman province. The central part of the intrusive body contains pinkish coarse-grained granite, but the fractured northern part, neighboring Chah-Mazraeh fault, has been subjected to pervasive Na-metasomatism and related subsolidus reactions. In the northern alte...
Newly obtained near-infrared reflectance spectra for features on or near the Aristarchus Plateau demonstrate he diversity of compositions in the region. t!ighland units are of three probable compositions: a feldspar and elinopyroxene assemblage; a probable clinopyroxene, olivine, and possibly feldspar assemblage; and an assemblage composed of olivine or olivine and feldspar. The feldspar-elinop...
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