Alkali basalt is one of the rocks comprising the Pali-Aike volcanic field, in Argentina.[1]
Alkali basalt or alkali olivine basalt is a dark-colored, porphyritic volcanic rock[2] usually found in oceanic and continental areas associated with volcanic activity, such as oceanic islands, continental rifts and volcanic fields.[3] Alkali basalt is characterized by relatively high alkali (Na2O and K2O) content relative to other basalts and by the presence of olivine and titanium-rich augite in its groundmass and phenocrysts, and nepheline in its CIPW norm.[4][5]
^Skewes, Milka Alexandra; Stern, Charles R. (1979). "Petrology and geochemistry of alkali basalts and ultramafic inclusions from the palei-aike volcanic field in Southern Chile and the origin of the patagonian plateau lavas". Journal of Volcanology and Geothermal Research. 6 (1–2): 3–25. Bibcode:1979JVGR....6....3S. doi:10.1016/0377-0273(79)90044-1.
^Haldar, S. K. (2017). Platinum-Nickel-Chromium Deposits. Elsevier. p. 45. ISBN 9780128020418.
^Winter, John DuNann (2001). An Introduction to Igneous and Metamorphic Petrology. Upper Saddle River, New Jersey: Prentice Hall. pp. 148, 182. ISBN 0132403420.
^Irvine, T. N.; Baragar, W. R. A. (1971). "A Guide to the Chemical Classification of the Common Volcanic Rocks". Canadian Journal of Earth Sciences. 8 (5): 523–548. Bibcode:1971CaJES...8..523I. doi:10.1139/e71-055.
Alkalibasalt or alkali olivine basalt is a dark-colored, porphyritic volcanic rock usually found in oceanic and continental areas associated with volcanic...
more than 5% alkali metal oxides. This places basalt in the B field of the TAS diagram. Such a composition is described as mafic. Basalt is usually dark...
successive eruptions of highly mobile lava flows. Volcanic rocks such as alkalibasalt, hawaiite, trachybasalt, benmoreite, tristanite, mugearite, trachyte...
containing 12% to 16% Al2O3 versus 16% to 20% Al2O3 for calc-alkalibasalts. Like all basalt, the rock type is dominated by olivine, clinopyroxene and plagioclase...
mid-ocean ridges) occurs less commonly, and there are rare cases of alkalibasalts. Regardless of composition, the flows are very homogeneous and rarely...
assistant Maurice Lambert had established that episodic eruptions of alkalibasalt and silicic peralkaline lavas had taken place at the MEVC over a timespan...
olivine and more typical tholeiitic basalt. The name "picrite" can also be applied to an olivine-rich alkalibasalt: such picrite consists largely of phenocrysts...
are the type locality. It is conformably overlain by massive pillowed alkalibasalt of the Little River Formation and conformably underlain by crystal tuff...
Hawaiite is an olivine basalt with a composition between alkalibasalt and mugearite. It was first used as a name for some lavas found on the island of...
southeastern flanks are composed of younger flows consisting of basalt, alkalibasalt, hawaiite, mugearite, and benmoreite from eruptive fissures starting...
well as solifluction deposits. The lowermost rock outcrops are Miocene alkalibasalt flows of the Raspberry Formation. Overlying these rocks are Miocene...
Mare basalts come in three distinct series in direct relation to their titanium content: high-Ti basalts, low-Ti basalts, and Very Low-Ti (VLT) basalts. Almost...
Wilson's Illuminatus Trilogy. The island is composed mostly of basalt, mostly alkalibasalt and hawaiites, and to a lesser extent mugearites. The island...
mantle and is common in peridotite xenoliths erupted in kimberlite and alkalibasalt. Diopside is a precursor of chrysotile (white asbestos) by hydrothermal...
and not more than about 6% alkali metal oxides. This places the andesite in the O2 field of the TAS classification. Basaltic andesite, with a content of...
may resemble basalt in hand specimen. However, basalt consists mostly of clinopyroxene (augite) and calcic plagioclase. Basalt, alkalibasalt, basanite,...
of Mesozoic and Paleozoic age. These rocks are overlain by Miocene alkalibasalt flows of the Raspberry Formation, the oldest geological formation of...
rocks are of Mesozoic or Paleozoic age and are overlain by Miocene alkalibasalt flows of the Raspberry Formation. The Raspberry rocks are overlain by...
name of harrat (the singular is harrah), form one of Earth's largest alkalibasalt regions, covering some 180,000 square kilometres (69,000 sq mi). Except...
however, as highly altered forms. Other rock types present include: alkalibasalt, nephelinite, lamprophyre, and carbonatite. Mantle xenoliths have been...
alkaline magma, either an alkalic picrite basalt or an ankaramite. This evolves to an alkali olivine basalt or basanite. Thereafter the series branches...
classification is used. Basaltic andesite is then defined as volcanic rock with a silica content from 52% to 57% and a total alkali content (K2O plus Na2O)...
alkalibasalt enriched in sodium and potassium relative to MORB. Larger islands, such as Hawaii or Iceland, are mostly tholeiitic basalt, with alkali...
The Alkali Canyon Formation is composed of basalt gravel and tuffaceous sediment. The Alkali Canyon Formation overlies the Columbia River Basalt Group...
the alkalic, the alkali-calcic, the calc-alkali, and the calcic series. His definition of the alkali series, and the term calc-alkali, continue in use...
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