������ɽ�������ͻ�����̨��Ե��ԥ���������й���Ҫ���������͹�����ɿ��֮һ��ǰ�˵��о���Ϊ��������γ���233 �� 221 Ma��148 �� 138 Ma ��131 �� 112 Ma ��3 �ڡ�����ͨ�����о�����������ͼ�������Ĵ�ع��컷�����ҽ������ͼ�ʱ���Լ�����γ�����ȷ�����ܽᣬ��Ϊ 233 �� 221 Ma ʱ�ڵ���󴲲���½�����컷����������ͬ�ڼ��������йء���Pb��Sr��Nd ͬλ����ɿ����ɿ����ʿ�����Դ��������ɽ���еĶ����飬�ɿ�Ԫ�������Լ򵥣��԰���Pb ��Au Ϊ������148 �� 138 Ma �ڼ����󴲿����γ��ڵؿǼӺ�Ĺ����У����γ����Եؿ�����Ϊ���������ͻ� I �͸Ƽ��������йأ�����Sr��Ba �����ϸߣ������ɿ�Ԫ����ҪΪFe ��W��131 �� 112 Ma ʱ�ڵ�����γ��ڵؿǼ����Ļ����У����й�������ʯȦ�IJ��������Ȧ��ӿ�ȹ����йصļ��ʡ��߼ػ���Ի�������ʯ��أ��ɿ�Ԫ����Ͼֲ���W��

Western Henan located between the northern Qinling orogenic belt and the southern North China platform��is one of the important molybdenum polymetallic and precious metal metallogenic belts in China. The previous work suggested that molybdenum deposits in the area are occurred in three stages��including 233 �� 221 Ma�� 148 �� 138 Ma and 131 �� 112 Ma. The authors summarized the types of molybdenum deposits and their tectonic setting�� types and age of magmatic rocks��and age of molybdenum deposits��and considered that the molybdenum deposits in the first stage occurred in continental extensional setting��and their formation possibly associated with its contemporary alkaline rocks. The metallogenic materials are likely originated from Dongpo Formation in Qinling orogenic belt based on the isotopes of Pb��Sr and Nd. The metallogenic elements are relatively simple��characterized by Pb or Au. The second staged deposits are possibly formed in the process of crust thickening��the remelting type and calc-alkaline rocks type I and the associated mainly with Fe and W. The third staged deposits formed in crustthinning setting��and the formation associated with potassium��high potassium or alkaline granitic rocks related to the lithosphere delamination and the upwelling of asthenosphere in eastern China. Metallogenic element is locally enriched W.