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・ Barrière d’Enfer
・ Barrière River
・ Barrmaelia
・ Barrmill railway station
・ Barrmill, North Ayrshire
・ Barro
・ Barro (disambiguation)
・ Barro (Llanes)
・ Barro Alto
・ Barro Alto, Bahia
・ Barro Alto, Goiás
・ Barro Blanco Dam
・ Barro Branco tree frog
・ Barro Colorado Island
・ Barro Duro
Barro Negro (volcano)
・ Barro negro pottery
・ Barro Ouro River
・ Barro, California
・ Barro, Ceará
・ Barro, Charente
・ Barrobo District
・ Barroca
・ Barrocas
・ Barrod
・ Barroetea
・ Barrois
・ Barroisiceras
・ Barrolândia
・ Barromán


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Barro Negro (volcano) : ウィキペディア英語版
Barro Negro (volcano)

Barro Negro is a scoria cone in the northern Puna of Argentina. About way from Abra Pampa, it is high and is no older than the underlying 6.6 mya Las Termas ignimbrite from Coranzulí caldera. It has generated two lava flows, one long extending southsoutheastward. The other northeastward is heavily eroded and only isolated lava plateaus are left.〔
The lavas erupted from the cone are porphyric trachyandesite-basalt of shoshonitic composition. They contain pyroxene and olivine phenocrysts with subordinate microphenocrysts of plagioclase and phlogopite and inclusions of gray minerals. The magmas generating this volcanism are primitive and may be oceanic crust-derived melts with some crustal contamination.〔
== References ==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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