DEFINITION OF CHINA’S DABIE SHAN ULTRA-HIGH PRESSURE METAMORPHIC BELT

The Qingling–Dabie-Sulu, or Dabie Shan, is the world’s

largest ultrahigh-pressure metamorphic belt, containing Triassic

(240–220 Ma) eclogite facies metamorphic rocks formed

during the collision of the North and South China cratons.

Most remarkably, the orogen contains coesite and diamondbearing

eclogite rocks, indicating metamorphic burial to

depths of more than 60 miles (100 km). The Dabie Shan

metamorphic belt stretches from the Tanlu fault zone between

Shanghai and Wuhan, approximately 1,250 miles (2,000 km)

to the west northwest of the Qaidam basin north of the

Tibetan plateau. The orogen is only 30–60 miles (50–100 km)

wide in most places, and it separated the North China craton

on the north from the Yangtze craton (also called the South

China block) on the south. A small tectonic block or terrane

known as the South Qingling is wedged between the North

and South China cratons in the orogen and is thought to have

collided with the North China craton in the Triassic, before

the main collision.

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