Abstract
The comprehensive results of whole-rock Sm-Nd and Rb-Sr and zircon Pb-Pb dating suggest that the Qinling Group in the Qinling orogenic belt, northwestern Henan was formed at about 1200 Ma. The complex in the interior of the orogenic belt experienced strong reworking in response to two great thermal cycles — the Jinningian and Caledonian cycles. Further disintegration of the Qinling Group delineated at present seems highly possible.
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