Results 11 to 20 of about 542 (177)
Bulletin of the Mineral Research and ExplorationThe Borucu (Aksaray) region, within the Central Anatolian Crystalline Complex, comprises a variety of rocks, including granite, alkali feldspar granite (AFG), pegmatite, and aplite dikes.
Gökhan Demirela +2 more
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PETROCHEMISTRY AND RADIOACTIVITY OF GABAL ABU AQARIB ALKALI FELDSPAR GRANITE, CENTRAL EASTERN DESERT, EGYPT [PDF]
Delta Journal of Science, 2006 The present work deals with geology, geochemistry and radiometry of Gabal Abu Aqarib Alkali Granite, Central Eastern Desert, Egypt. Gabal Abu Aqarib about 136 km2, and represents a part of the late Precambrian Arabian Nubian Shield.
A. El-Naggar, Ata A. El Shafi
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A mineralogical perspective on the granite alkali feldspar megacrysts paradox
LithosAlkali feldspar megacrysts (commonly named K-feldspar) are a distinctive feature of many plutonic rocks. Yet, there is still no consensus on their origin. Two main contrasting explanations have been proposed so far: (i) the megacrysts form late during the crystallization history of the plutonic rock in which they occur and attain their large size in a ...
Silvio Ferrero, Stefano Cuccuru
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Skeletal quartz and dendritic biotite: Witnesses of primary disequilibrium growth textures in an alkali-feldspar granite [PDF]
Lithos, 2019 Abstract We describe a case of S-type alkali-feldspar granite (quartz/K-feldspar/plagioclase/ biotite/garnet ∼ 30/35/20/13/2 vol%) showing skeletal and dendritic textures. It consists of three nested units distinguishable by the size of biotite crystals: a first-emplaced unit characterized by small biotite flakes (0.4–9 mm); a second unit with cm ...
Pierre Barbey +2 more
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Ganseki Kobutsu Kagaku, 2005 Alkali feldspars in the Tanakami granite, southwest Japan, contain a complicated fine-scale mixture of various micro-textures; lamellar crypto- and micro-perthites and micropore-rich patch perthites. Mineralogical examination mainly by TEM and SEM disclosed that there are two formational stages of these micro-textures, the subsolidus cooling stage and ...
Junji Akai
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Pseudomorphism of alkali feldspar to biotite from the alkaline nana complex granite in Cameroon
Discover GeoscienceAlkaline complexes all over the world generally are enriched in high–field strength elements and rare earth elements. This enrichment can be accounted for by magmatic processes, but, many of these complexes display evidence of hydrothermal alteration. In
Pauline Nguet Wokwenmendam +6 more
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Petrology and Zircon morphology of granitoid rocks at um Bogma Environs, south west Sinai, Egypt [PDF]
Delta Journal of Science, 2023 This paper studies the morphology of zircon crystals as well as geological and petrographical characteristics of granitoid rocks at Um Bogma environs, south Sinai, Egypt to provide the rock nomenclatures and to deduce their origin and magma types.
tarek hagag
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Petrology and tectono-magmatic setting of Zorrati granitoid, southwest of Birjand (East of Lut block) [PDF]
پترولوژی, 2023 The Zorrati granitoid (ZG) pluton exposed on the eastern edge of the Lut block trending north-south. The Lut block surrounded in the north by the Darone fault, in the south by the Jazmurian fault and in the east and the west by Nahbandan and Naiband ...
Ebadolah Toulabi Nejad +4 more
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Egyptian Journal of Remote Sensing and Space Sciences, 2021 At Sharm El-Sheikh area a unique association of Neoproterozoic Younger granitic phases is found. These granitic rocks are petrographically identified as monzogranite, syenogranite, alkali feldspar granite, and riebeckite granite.The magma sources of ...
N.I. Abd El Ghaffar +4 more
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Frontiers in Earth Science, 2023 The Shanagen hydrothermal vein-type Mo deposit belongs to the Derbugan metallogenic belt, which is located in the Ergun block, NE China. The Mo mineralization is mainly developed in sericitized quartz siltstone around alkali-feldspar granite.
Yunxia Wu +9 more
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