Information om | Engelska ordet TRACHYANDESITE

Exempel på hur man kan använda TRACHYANDESITE i en mening

• An exception is the tephra of Deception Island, which is of trachyte and basaltic trachyandesite, richer in potassium and sodium.
• Alumbrera and La Laguna has erupted alkaline to sub-alkaline basaltic trachyandesite to trachybasalt with a porphyritic texture.
• It is constructed by lava flows that range in composition from basaltic andesite bordering on trachyandesite over dacite and smaller flows of partially silicic magma.
• Basanite, basalt, benmoreite, hawaiite, phonolite, trachyandesite, trachyte and tristanite have been recovered from The Pleiades.
• The volcano has erupted trachyandesite and trachydacite in the later stages of activity, after a stage with andesitic to dacitic eruptions.
• 78 million years ago, built up much of the stratovolcano and consisted of trachyandesite, trachydacite, and dacite.
• Double Diamond Member (36–34 Ma), laterally discontinuous volcaniclastics, basaltic trachyandesite, phonotephrite, and trachyte.
• When it is possible to identify the minerals present, trachyandesite is characterized by a high content of sodic plagioclase, typically andesine, and contains at least 10% alkali feldspar.
• The whole-rock chemistry of the volcanics is relatively normal, ranging from trachyandesite (latite) to phonolite and trachyte, but the mineralogy is unusual.
• More specifically, it is a potassium-rich variety of basaltic trachyandesite, composed of olivine, augite and plagioclase phenocrysts in a groundmass with calcic plagioclase and sanidine and some dark-colored volcanic glass.
• These cliffs expose hundreds of feet of Miocene and Oligocene lava flows and ignimbrites, which include Steens basalt and various andesite, trachyandesite, and tuff flows.
• The building was constructed using thousands of blocks of volcanic rocks carried from the cliffs at Cabo Girão, namely trachybasalt, trachyandesite, trachyte, tephrite and ashes, lapilli and breccia tuff.
• The volcano erupted a wide variety of lavas including basanite, hawaiite, phonolite, mugearite, benmoreite and trachyte, as well as small amounts of basaltic andesite and basaltic trachyandesite.
• They consist of andesite, dacite, rhyodacite, rhyolite, trachy-basaltic andesite, trachyandesite and trachydacite.
• Rocks erupted in the field include alkali basalt, basalt, basanite, foidite, hawaiite, phonolite, tephriphonolite, trachyandesite, trachybasalt.
• The field is dominated by trachyandesite and trachydacite, ranging from tephrite over trachyandesite to trachyte and rhyolite.
• Olivine basalt, basanite and tholeiite have been found as well, with smaller amounts of trachyandesite.
• Its composition ranges from trachyandesite to trachydacite and is significantly hydrothermally altered.
• Minerals encountered in the vulcanites include andesite, trachyandesite and dacite containing augite, and are subalkaline.
• The Foundation Seamounts are constructed by various types of alkalic magmas, including alkali basalt, trachyandesite and trachydacite.

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