نتایج جستجو برای: rhyolite

تعداد نتایج: 435  

Journal: :Journal of Petrology 2022

Abstract Eastern Australia encompasses the longest track (~2000 km) of age-progressive continental volcanoes on Earth. These so-called ‘central volcanoes’ are shield considered as surficial expressions Cenozoic mantle plume activity under northward moving Australian continent. Here, we investigate three central located in southern, younger part volcanic (Ebor, Nandewar, and Canobolas) with aim ...

Journal: :International journal of advances in scientific research and engineering 2021

The ground magnetic survey was carried out using a Scintrex proton precession magnetometer to map subsurface structures and mineralization potentials at the Alajawa area in Shanon, Kano State. 2D forward modeling delineation of geological that are potential zones. Surfer 15 software used produce residual contour map. A total five (5) profiles anomalies were modeled Mag2dc software. mineral loca...

کوهساری, امیرحسین, دهقانزاده بافقی, علی اکبر , محمد تراب, فرهاد ,

Gazestan deposit is located about 185 km of Yazd, in the Bafgh – Posht e Badam Metallogenic belt, consists of Infracambrian carbonate, shale, tuff, sandstone and volcanic rocks. Acid to basic green rocks (rhyolite, dacite and basalt) are host for iron and phosphate mineralization. The alteration process is more intence in the volcanic rocks including, actinolite, chloritization, silicification ...

رحیمی, گلاره, آسیابانها, عباس, کنعانیان, علی ,

Post-Eocene volcanic rocks of Alborz tectonic zone located in the NE of Qazvin, composed of rhyolite, trchydacite, trachyandesite, andesite, trachybasalt and basalt with porphyritic textures, pyroclastic rocks and volcanic red breccia which are settled alternatively on Eocene pyroclastics and tuffs. The volcanic rocks are enriched in LIL and depleted in HFS elements which may indicate a calc-al...

Journal: :Geochemical Journal 2021

One of peculiar geochemical characteristics in the chondrite-normalized REE patterns from highly fractionated granites and high silica rhyolite is extremely large negative Eu anomaly (Eu/Eu* < 0.10) due to very low concentration Eu. Particularly, provides a valuable information for evolution processes earth planetary materials. has only two isotopes, 151Eu 153Eu. In this study, isotope ratios i...

Journal: :Geology of the intermountain West 2022

The Sevier Plateau is a gently east-tilted, block-faulted range in the High Plateaus transition zone of southwestern Utah. Part this underwent basin-range deformation, including at least 6000 feet (1800 m) uplift, 3-million-year time span. north-south range, whose southern end just north Bryce Canyon National Park, was uplifted and tilted by fault along western side. Kingston deep, east-west an...

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