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~(40)Ar-~(39)Ar Isotopic Dating for Paishanlou Gold Deposit and Its Geological Implication

WANG Rong-hu1,JIN Cheng-zhu1,LI Jing-chun2(1.School of Resources & Civil Engineering,Northeastern University,Shenyang 110004,China;2.Shenyang Institute of Geology and Mineral Resources,Shenyang 110032,China.)  
The Paishanlou big gold deposit is situated in the margin of the North China Craton,and the gold deposit is in the Archeozoic meta-volcanic rock of Wulashan group.The ore body especially the host is strictly controlled by ductile shear zone and in the biotite-anorthose and gneissic/felsic mylonite.The 40Ar-39Ar isotopic geochronology of the potassium feldspar formed in the metallization phase in the gold deposit was studied.The result showed that the K-feldspar has an 40Ar-39Ar plateau age(116.69±1.15) Ma and isochron age(116.97±1.39) Ma,which reveal the age of the deposit,i.e.,formed in early Cretaceous.And the K-feldspar in the prorphyro-like granite has an 40Ar-39Ar plateau age(126.71±2.03) Ma and isochron age(124.00±4.32) Ma,which reveal that the mineralization was beginning not earlier than(126.71±2.03) Ma ago.The age of Paishanlou gold deposit is in close coincidence with other gold deposits situated in the margin of the North China Craton.The result indicated that most of the gold deposits in the same region formed in the period during which the geodynamic metamorphism occurred in East China during Mesozoic era.
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