Single-grain zircon U-Pb analyses, combined with Sm--Nd, Rb--Sr, K--Ar and <sup>40</sup>Ar-<sup>39</sup>Ar datingresults, suggest that there are four magmatic p
An enormous thrust nappe and a metamorphic core complex of extensional origin have been recently discovered within the Hercynian-Indosinian orogen of Inner Mong