Itasy Volcanic Field

sopka (bez známé erupce za posledních ~12 000 let), Madagascar, Somalian-Antarctic Volcanic Regions

Kde

Madagascar, Somalian-Antarctic Volcanic Regions

Typ (GVP)

Volcanic field

Nadmořská výška

1 800 m

Poloha

-19,031°, 46,644°

The Itasy Volcanic Field in central Madagascar contains a diverse assemblage of volcanic landforms, including scoria cones, lava domes, and maars. Activity began in the Pliocene, when eruptions produced trachytic lava domes and basanitic lava flows. Later activity produced trachytic lava flows and Vulcanian eruptions. A trachytic maar is located near Saovinandriana, and several other small crater lakes are present. Minor seismicity and thermal activity is present in the form of hot springs. Radiocarbon dates reported in 1970, 1973, and 1993 lack stratigraphic, location, and eruption source details. Rasoazanamparany (2021) conducted new sampling form lava flows and scoria cones across the volcanic field, resulting in 40Ar/39Ar ages from about 31 to 104 ka. While Holocene maars created by phreatic or phreatomagmatic explosions are possible, there is no clear evidence for such activity.

Text: Smithsonian Global Volcanism Program.

Údaje o sopce: Smithsonian Global Volcanism Program. Další sopky a průduchy.