Taryatu-Chulutu
Coordinates: 48°10′N 99°42′E / 48.17°N 99.7°E Taryatu-Chulutu (Mongolian: Тариатын чулуут, tariatyn chuluut, "rocks of Tariat") is a volcanic field in Mongolia. It is part of a volcanic area in Central Asia in the Hangai range that may be linked to the rifting of the Lake Baikal Rift. The field itself is located within the valleys of the Chuluut and Suman rivers. Volcanic activity occurred in the Miocene, Pliocene, and Holocene. The Khorgo cinder cone erupted during the Holocene and lava flows from it formed a lava dam generating Terkhiin Tsagaan Nuur lake.
The volcanic field lies in the Taryatu depression, on the northern slope of the Hangai range. There, the field spans the river valleys of the Chuluut River, its tributary Gichigin and the Suman River rivers. The field is sometimes named Tariat volcanic field after the town of Tariat. Rivers frequently run in canyons bordered by lava plains.
Tectonically, the field is located within the Tarvagatay terrane which formed 3,000-200 mya ago and between 1,000 and 250 mya was accreted into the Central Asian Orogenic Belt. This terrane is formed by amphibolite, gneiss, migmatite and schist. An anorthosite pluton has yielded ages of 3,050 mya and is the oldest age from this terrane. Following stabilization of the whole Hangai region in the Paleozoic, only in the late Cenozoic did tectonic activity recommence.
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