Chronology and geochemical characteristics of Mesozoic granites in Jiaodong area and their relationship with gold silver polymetallic mineralization
Jiaodong area is one of the important regions of Mesozoic large-scale mineralization and an important part of the magmatic belt in eastern China.The Mesozoic granites are mainly divided into the Late Jurassic Linglong Stage(147-162 Ma),Early Cretaceous Guojialing Stage(125-133 Ma),Late Early Cretaceous Weideshan Stage(110-123 Ma)and Laoshan Stage(110-118 Ma).Linglong granite is crustal remelting S-type rock,and the source of materials is mainly Paleoproterozoic Jingshan Group,Fenzishan Group and Neoarchean TTG gneiss;Guojialing granite is high w(Ba)/w(Sr)granite and Weidershan granite is I-type granite,both of which are derived from crust-mantle mixing;Laoshan granite is crustal remelting A-type granite.The gold and polymetallic mineralization is mainly formed in the Early Cretaceous,which is consistent with the Weideshan granite;spatially,the Linglong granite and Guojialing granite are the most important enclosing rocks of the gold deposits;the metallogenic materials of the gold silver poly-metallic deposits are characterized by obvious mantle origin,which is closely related to the Weideshan granite,and the upper mantle's contribution to Mesozoic petrogenesis and metallogeny of the Jiaodong area is mainly realized through the mantle source C-H-O fluid activity.Differentiation occurs after the gold-bearing mantle source C-H-O fluid enters into the crust.When the fluid after the differentiation rises to a certain height,with the continuous lowering of the temperature and the continuous addition of atmospheric water,mineralization occurs and gold silver polymetallic deposits in the rock body or the appropriate parts outside and altered rock-type,vein-type and other gold deposits in appropriate parts outside of the rock body.
Mesozoicgranitepetrogenesisrelationship between petrogenesis and mineralizationtectonic settingJiaodong area
NETL
NSTL
万方数据
维普
