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Simcoe volcan

champ volcanique
Washington, USA (mainland exept Alaska), 46.1°N / -120.9°W
Condition actuelle: (probablement) éteint (0 sur 5) | Reports
Simcoe livres
Style éruptif tipique: Explosive
Eruptions du volcan Simcoe: ca. 5-1 million years ago (Lincoln Plateau & Signal Peak: 1-0.5 million years ago)
HeureMag. / DepthDistanceLocation
Thu, 21 Mar 2019
Thu, 21 Mar 16:54 UTCM 1.5 / 14.4 km36 km26km SSW of Toppenish, Washington (USA)
Thu, 21 Mar 05:29 UTCM 0.8 / 5 km1 km38km NNE of Amboy, Washington (USA)
Tue, 19 Mar 2019
Tue, 19 Mar 18:54 UTCM 0.7 / 13.1 km109 km4km ENE of Mattawa, Washington (USA)
Mon, 18 Mar 2019
Mon, 18 Mar 05:52 UTCM 1.3 / 3.1 km27 km13km SW of Packwood, Washington (USA)
Sun, 17 Mar 2019
Sun, 17 Mar 16:00 UTCM 0.8 / 12.7 km12 km37km SSE of Morton, Washington (USA)
Voir tous
Simco volcanic field is a N-S aligned cluster of 24 monogenetic cinder cones. It is located E and SE of Mt Adams, Washington, California, near the town of Goldendale.
Associated is the younger basaltic Lincoln Plateau with Signal Peak at the western end of the field and east of Adams. It was formed by a shield volcano active until about half a million years ago.

Introduction:

From: Wood and Kienle, (eds.), 1990, Volcanoes of North America - United States and Canada: Cambridge University Press.
cited on CVO website(USGS Cascades Volcano Observatory)
"
East and southeast of Mount Adams, extending south to the town of Goldendale, is a broad expanse of folded and faulted basalt that is little known. A north-south line of around 24 cinder cones crosses the center of the field, and south of the 46th parallel another dozen cones extend the line to the southeast. The oldest units are thick flows of rhyolite in the eastern Simcoe Mountains. These are contemporaneous with pyroxene-olivine basalt and olivine basalt of the Simcoe Mountains. The pyroxene-olivine basalt forms short, 6-10-meter-thick flows, whereas the olivine basalts are 1-6-meter-thick flows, extruded from small shields and cinder cones. A few of the above units are dated at 4.5 to 0.9 million years ago.
East of Mount Adams are a shield volcano and the lava flows forming Lincoln Plateau; all are olivine basalt probably younger than 0.9 million years. Perhaps the youngest unit of this volcanic field is the dacite that forms Signal Peak, east of Mount Adams, that is believed to be 1.0-0.5 million years.
"


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