THE METAMORPHIC CORE COMPLEX OF SOUTH KALATAG NEAR HAMI, XINJIANG

The metamorphic core complex of South Kalatag is located in the Zhongtianshan terrane in the Dongtianshan region. The metamorphic core complex is in the continental margin. Early in it`s development it had a transmeridional ellipse shape due to destruction caused by faulting. The metamorphic core complex has an inner core composed of gneiss of Kalatag group (Pt1-Ar3K) and synkinematic intrusions that is surrounded by a decollement system. The decollement system is composed of gneiss of Kalatag group (Pt1-Ar3K ), schist of the Xingditage group (Pt1X) and metamorphic detrital rocks of the Xingxingxia group (Ch1X), in which developed imbricate detachment faults. There are many detachment faults between the inner core and the decollement system. Surrounding the decollement system are cover rocks composed of the Lower Carboniferous Yamansu group (C1y). The metamorphic core complex formed during the Upper Devonian to the early Lower Carboniferous.