نتایج جستجو برای: volcanics
تعداد نتایج: 398 فیلتر نتایج به سال:
The study area is located about 220 km southwest of Mashhad and 80 km south of Neyshabur, at 54° 42' 15" to 54° 43' 40" longitude. Initially, remote sensing is carried out based on the SAM method and it denotes propylitic, carbonitization, silicification and argillic alterations. This area comprises of outcrops of Paleocen-Eocene volcanics. Golcheshmeh area also shows copper mineralization at s...
The study subvolcanic intrusion, comprising syenodiorite, monzonite and quartz-monzonite, is cropped out in Talkh-rud valley located in the northeast of Damavand volcano flank. This sub-volcanic intrusion possesses porphyritic texture and consists of plagioclase, alkali feldspars, phelogopite, amphibole, clinopyroxene, apatite and titanomagnetite. Evidences of disequilibrium such as zoning and ...
The emplacement of the Siberian Traps, Central Atlantic Magmatic Province (CAMP) and Wrangellia have been linked to end-Permian, end-Triassic mass extinctions, Carnian Pluvial Episode (CPE), respectively. Exploring timing, eruptive styles, volatile degassing these Large Igneous Provinces (LIPs) is crucial understand their causal link catastrophic environmental crises that punctuated Triassic. I...
High-level natural radioactivity, geochemical, geological, and radiological hazard assessment of the poorly investigated Wadi Gebeiy Dokhan volcanics rocks are discussed. located in Southwestern Sinai, Egypt, covering an area ~1.3 km2. represented by porphyritic dacite. Geochemically, they have medium-k characters originate from calc-alkaline magma within a arc environment. Along fault plane st...
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