Kolob

sopka (bez známé erupce za posledních ~12 000 let), United States, North America Volcanic Regions

Kde

United States, North America Volcanic Regions

Typ (GVP)

Volcanic field

Nadmořská výška

2 727 m

Poloha

37,330°, -113,120°

The basaltic Kolob volcanic field on the west margin of Zion National Park contains the youthful-looking Crater Hill cinder cone and associated lava flows at the SW corner of the park and older cones to the north on the upper Kolob Plateau. The latter cones are Pleistocene in age and were erupted through the colorful rocks of the Navajo Sandstone formation, producing lava flows that extended 10-15 km down valleys to the south. Lava flows from Crater Hill blocked drainages, forming the ephemeral Coalpits and Grafton lakes. The latter extended up the Virgin River past the current town of Springdale at the southern entrance into Zion National Park. Crater Hill was at one point considered to be of probable Holocene age, but later work taking into consideration stream downcutting rates suggest an age of about 100,000 years (Biek et al., 2003). An optically stimulated luminescence date of 122.3 +/- 15.73 ka was obtained from sediments in Grafton Lake, formed by the lava flow from Crater Hill.

Text: Smithsonian Global Volcanism Program.

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