Tectonic melange zone of Mianxian|Lüeyang is a non|Smith stratigraphic region which consists of many structural slices from the Archean to Carboniferous. This region has developed rift volcanic rocks of the Devonian, ophiolite,island arc and ocean volcanic rocks,and radiolarian siliceous rocks of the Carboniferous. The features of ordinary, trace and rare earth elements of the volcanic rocks and siliceous rocks suggest the existence of an open ocean during the Devonian and Carboniferous. This ocean basin was formed by further breaking off on the basis of the rift during the Palaeozoic, subducted in the Carboniferous, and closed and collided in the Late Triassic.
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