نتایج جستجو برای: volcanics
تعداد نتایج: 398 فیلتر نتایج به سال:
Zircon is an stable mineral during post crystallization processes and preserves characters of magmatic events. Zircon morphology can give some information about temperature, nature, and source of the magma. Study of the zircon morphology of Cretaceous granitoids and acidic volcanics from the southeast Saqqez area reveals that most of the crystals are P5 and S25 types with high alkalinity (I.A.)...
We studied zircon from banded iron formations (BIFs) in the Kostomuksha greenstone belt (KGSB), Karelian Craton, for first time. Here, BIFs are associated with Mesoarchean basalt-komatiites – BIF-1 and felsic volcanics BIF-2, as well Neoarchean graywackes BIF-3. All contain accessory zircon. Analysis of its isotopic age shows presence 1-4 clusters each sample. There single grains detrital most ...
Abstract Geochemical and mineralogical investigations of the Lower Permian Kemmlitz rhyolite within NW-Saxonian Basin (Germany) associated lithophysae (high-temperature crystallization domains) as well agates were carried out to constrain genesis characteristics these volcanic rocks origin agate-bearing lithophysae. The rhyolitic composition are dominated by quartz, sanidine, orthoclase most li...
Geological mapping was carried out in the outer part of Lesser Himalaya Barahakshetra – Tribeni area east Nepal along Arun River valley. A revised and updated tectono-lithostratigraphic scheme with detailed description each unit their comparison central west has been presented this work. The is divided into three tectonic units named as Chimra Thrust Sheet, Dharapani Sheet Paraautochthon from n...
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