alkali basalt sentence in Hindi
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- The volcano has erupted alkali basalts typical for rift zone volcanoes.
- Alkali basalts typically have mineral assemblages that lack orthopyroxene but contain olivine.
- Ankaramites and alkali basalts are the primary volcanic rocks comprising the basal shield.
- Alkali basalts have few vesicles and a gray colour.
- Alkali basalt may contain minor nepheline and does contain nepheline in its CIPW normative mineralogy.
- Several outcrops of alkali basalt are present south of Kennicott Lake and the Tahltan River.
- Campania has an alkali basalt from but it also has younger flows of olivine tholeiites.
- The rare earth element contents are transitional between Planchon-Peteroa and Patagonia alkali basalt signatures.
- Many alkali basalts may be formed at greater depths, perhaps as deep as 150 200 km.
- The sequence has been divided into a lower pillowed tholeiitic unit and an upper porphyritic alkali basalt unit.
- These felsic volcanics are understood to have been created by fractionation of mainly alkali basalt magma in crustal reservoirs.
- Eight to ten sequences of columnar jointed alkali basalt comprise this unit and have a total thickness of } }.
- The trachyte and comendite lavas are understood to have been created by fractionation of mainly alkali basalt magma in crustal reservoirs.
- Basalt, alkali basalt, basanite, tephritic nephelinite, and nephelinite differ partly in the relative proportions of plagioclase and nepheline.
- Alkali basalts form columnar jointed lava flows, peralkaline trachytes, pantellerites, comendites and rhyolites form the overlying stratovolcano and domes.
- This comprises up to seven } } thick columnar cooling units of alkali basalt separated by buff-weathered vesicular lava flows.
- The volcano is known to have produced at least four types of lava, namely alkali basalt, hawaiite, trachyte and trachybasalt.
- Volcanism in the NCVP can be traced as far back as 20 million years ago with the emplacement of alkali basalt in western Yukon.
- Initial volcanism produced a } } thick sequence of columnar jointed alkali basalt flows and altered grey-green vesicular basalts which form the lowest unit.
- The chemical composition of these basalts can vary from tholeiite to alkali basalt within the same island group, but it is never calc-alkaline.
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