Jianping metamorphic Complex, the lowest section of the Archaean terrain from the Western Liaoning Province, is composed of discontinuous supra-crustal rocks, an amount of TTG rocks and some other plutons. Single zircon ages for TTG series and some other plutons obtained by the Pb evaporation method show that intrusion of TTG series began at 2521Ma and reached a peak at about 2500Ma.This was followed by high-grade metamorphic and deformed event, transforming the above assemblages into graulites, charnockites and enderbites some 2483-2490Ma.The intrusion of post tectonic granites in 2472Ma associated with regional retrogression ends the evolution of this area. A likely tectonic setting in which the Jianping metamorphic Complex was formed is an active continental margin that is involved in continental collision and crustal thickening shortly after its formation.
Key words:
Zircon age; TTG suite; Jianping metamorphic Complex; western Liaoning Province
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