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THE GEOLOGICAL AND GEOCHEMICAL CHARACTERISTICS OF PENGJIAKUANG GOLD DEPOSIT , SHANDONG PROVINCE

Pengjiakuang gold deposit in Jiaodong gold metallogenic province is a stratabound gold deposit.It is different from traditional gold deposit,such as Jiaojia type gold deposits and Linglong type gold deposit in Jiaodong Block . It occurs in a detached fault separated conglomerate of Early Cretaceous Laiyang Formation and metamorphic complex of Lower Proterozoic Jingshan Group on the margin of Jiaolai Basin , and was formed before Yanshan volcanic period.Isotope geochemical studies show that the sulfur isotope comes from metamorphic complex of Lower Proterozoic Jingshan Group , carbon isotope comes from the marble in Jingshan Group , while a part of lead comes from the mantle . According to the data of hydrogen , oxygen isotopic compositions (δ 18 O H 2O =0.59‰~4.03‰,δD H 2O =-89.5‰~-97.9‰ ) , the conclusion can be reached that the ore forming fluid of Pengjiakuang gold deposit was a kind of mixed hydrothermal solution which was mainly composed of meteoric water and magmatic water .