Jom-Bolok Volcanic Field
Jom-Bolok, also known as Volcano Valley and East Sayan Volcanic Field, is a volcanic field in Russia, west of Lake Baikal. It is part of the Baikal rift zone which is also responsible for volcanism elsewhere around Lake Baikal. The volcanic activity has generated long lava flows and cinder cones. One of the lava flows is long and has a volume of . Volcanic activity in the field commenced during the late Pleistocene in an area that had been previously influenced by glaciers and with even earlier volcanic and tectonic activity. Magma probably formed during deglaciation was erupted during the early Holocene, generating the long lava flow. A much more recent eruption in the southern part of the field may be referenced in Mongolian chronicles. Geologic context The Jom-Bolok volcanic field lies in the over high East Sayan Mountains and is far removed from the major plate boundaries around Asia. It may be under the influence of the subducting Pacific plate regardless, as well ...
[...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]  

Volcanic Field
A volcanic field is an area of Earth's crust that is prone to localized volcanic activity. The type and number of volcanoes required to be called a "field" is not well-defined. Volcanic fields usually consist of clusters of up to 100 volcanoes such as cinder cones. Lava flows may also occur. They may occur as a monogenetic volcanic field or a polygenetic volcanic field. Description Alexander von Humboldt observed in 1823 that geologically young volcanoes are not distributed uniformly across the Earth's surface, but tend to be clustered into specific regions. Young volcanoes are rarely found within cratons, but are characteristic of subduction zones, rift zones, or in ocean basins. Intraplate volcanoes are clustered along hotspot traces. Within regions of volcanic activity, volcanic fields are clusters of volcanoes that share a common magma source. Scoria cones are particularly prone to cluster into volcanic fields, which are typically in diameter and consist of several tens ...
[...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]