Most volcanoes are born at the edges of colliding tectonic plates, but the Ulanhada Volcanic Cluster is an intraplate volcano—essentially a product of geological activity within the continental plate itself, without a direct connection to plate collision. The formation of this volcanic cluster was primarily driven by the long-distance compression from the Indian Ocean Plate against the Eurasian Plate, combined with the assistance of deep fault zones beneath the region, ultimately triggering volcanic activity in the heart of the plateau.

On a broad geological scale, the Indian Ocean Plate has been persistently pushing northward against the Eurasian Plate. This force not only uplifted the Qinghai-Tibet Plateau but also continued to transmit inward, affecting the southern part of the Mongolian Plateau. This sustained compression and stretching caused the crust to thin, loosen, and crack, disrupting the original stability of underground rock layers. Deep beneath the surface, high-temperature mantle material surged upward, forming the magma source capable of eruption, providing ample material and dynamic force for the birth of volcanoes.

Volcanic crater. Source: Ulanhada Volcano Scenic Area

From the perspective of local geological conditions, Ulanhada sits atop two key deep fault zones beneath the surface, which crisscross, penetrate the crust, and connect directly to the magma layer below. These fault zones act like the Earth's "natural pipelines," providing pathways for underground magma to surge upward and erupt to the surface. Combined with the thinner and less stable crust in this region, magma was able to break through the surface more easily, ultimately forming this unique inland volcanic cluster deep in the Mongolian Plateau, far from plate boundaries.

This article was compiled by the International Mountain Tourism Alliance (IMTA) through its "Two Microblogs and One Website" integrated platform.

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First Review: Yuan Jiali
Second Review: Bao Gang
Third Review: Pan Kaiyue