نتایج جستجو برای: rhyodacite

تعداد نتایج: 59  

2008
V. FODOR

Dunite nodules (Foss) and megacrysts of olivine (Fos3 s4 ) and clinopyroxene (FS13W043En44) are present as rare inclusions in the rhyodacite (~ 66wt %SiO z ) of Kauaopuu Ridge, Oahu, Hawaii. The rhyodacite is interbedded with caldera-filling tholeiitic lavas of the Waianae volcano. Results: (I) Dunite nodules (::;; I cm) consist of xenomorphic-granular olivine and minor chrome spinel and clinop...

Journal: :Archives of Agronomy and Soil Science 2022

This work investigated collateral effects on non-target yerba mate (Ilex paraguariensis A. St.-Hil) plants when using glyphosate for weed control; growth and leaf elemental composition were examined. Special emphasis was placed examining the heavy metals Cd Pb due to regulations defining maximum limits in South American infusion products. The experiment conducted pots [applied Congo grass (Brac...

Journal: :Geologica Balcanica 2021

The subject of this study is the description eight specimens fossil gastropods Campanile lachesis Bayan, 1870, family Campanilidae, from fund Regional Museum History in Kardzhali. They were found area village Gorna Krepost, Kardzhali Municipality, at eastern foot Archeological Complex Perperikon, upper Eocene (Priabonian) limestone layers so-called Beli Plast Rhyodacite Complex. paleoecological...

2003
Marcus Wigand Axel K. Schmitt Robert B. Trumbull Igor M. Villa Rolf Emmermann

The Erongo subvolcanic center in Namibia is the largest composite, bimodal complex in the Mesozoic Etendeka igneous province of Namibia. This study of 40Ar/39Ar and high spatial resolution U^Pb zircon dating demonstrates that emplacement of the various igneous units at Erongo took place within a time span equivalent to or shorter than geochronologically resolvable age differences (ca. 2 Ma), an...

2004
Marcus Wigand Axel K. Schmitt Robert B. Trumbull Igor M. Villa Rolf Emmermann

The Erongo subvolcanic center in Namibia is the largest composite, bimodal complex in the Mesozoic Etendeka igneous province of Namibia. This study of 40Ar/39Ar and high spatial resolution U^Pb zircon dating demonstrates that emplacement of the various igneous units at Erongo took place within a time span equivalent to or shorter than geochronologically resolvable age differences (ca. 2 Ma), an...

خلیلی, محمود , مکی‌زاده, محمدعلی , نقره‌‌ئیان, موسی , پارساپور, انیس ,

The study area is a part of central Iranian Cenozoic magmatic belt. The dominant rock type in the area is rhyodacite with Eocene in age. These rocks have been effected by Qum-Zefreh fault as well as alteration by hydrothermal solutions. Due to sulfate - acid alteration, the following  minerals are formed: pyrite + alkali feldspar + sericite + pyrophyllite + barite+  jarosite + hematite + quartz...

Journal: :زمین شناسی اقتصادی 0
بهزاد مهرابی ابراهیم طالع فاضل علی نخبه الفقهائی

the iranian east magmatic assemblage (iema) in the central lut region, hosted porphyry and vein-type polymetallic mineralization. the galechah-shurab mining district is located in nw of the iema. volcanic and subvolcanic bodies in the area are composed of calc-alkaline porphyry quartz-latite, porphyry dacite and rhyodacite and hornblende-biotite andesite, equivalent to i-type granite. they empl...

2012

Kepsut-Dursunbey volcanic field (KDVF) is located in NW Turkey and contains various products of the post-collisional Neogene magmatic activity. Two distinct volcanic suites have been recognized; the Kepsut volcanic suite (KVS) and the Dursunbey volcanic suite (DVS). The KVS includes basaltic trachyandesitebasaltic andesite-andesite lavas and associated pyroclastic rocks. The DVS consists of dac...

Journal: :Geosciences 2023

In order to understand further the emplacement (i.e., volcanic growth) of 22 Icelandite and 3 Rhyodacite cooling units in one long sequences known as Mauna Kuwale Wai’anae volcano (ca. 3.3 Ma), Oahu Hawaii we have conducted appropriate rock magnetic experiments described below well anisotropy susceptibility (AMS) studies such 25 units. We undertaken investigations continuous partial thermo-magn...

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