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地质科学  2001, Vol. Issue (1): 51-63    DOI:
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胶东蓬家夼金矿床地质与地球化学特征
杨金中1,2, 沈远超1, 刘铁兵1, 张连昌1, 邹为雷1, 李光明1, 曾庆栋1
1. 中国科学院地质与地球物理研究所 北京 100029;
2. 国土资源部航空物探和遥感中心 北京 100083
GEOLOGICAL AND GEOCHEMICAL CHARACTERISTICS OF PENGJIAKUANG GOLD DEPOSIT, EAST SHANDONG
Yang Jinzhong1,2, Shen Yuanchao1, Liu Tiebing1, Zhang Lianchang1, Zou Weilei1, Li Guangming1, Zeng Qingdong1
1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029;
2. Aero-Geophysical Survey and Remote Sensing, Ministry of Land and Resources, Beijing 100083
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摘要 蓬家夼金矿床是胶东地区新近发现的金矿床之一,矿体赋存在胶莱盆地东北缘层间滑动断层带中、莱阳组砾岩与荆山群地层的构造接触部位,为区内燕山期火山活动前期,在大气水和岩浆水的参与下形成的层间滑动角砾岩型金矿床。同位素研究表明,蓬家夼金矿的硫、碳来源于矿区围岩;部分铅则可能具有地幔成因。包裹体气相成分以H2O、CO2为主;液相成分中富Na+、Cl-,贫K+、F-。成矿流体δ18OH2O为0.59‰~4.03‰,δDH2O为-97.95‰~-89.5‰,反映了成矿流体由大气水和岩浆水混合组成的特点。成矿时代在100Ma。
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杨金中
沈远超
刘铁兵
张连昌
邹为雷
李光明
曾庆栋
关键词蓬家夼金矿   胶莱盆地   地质特征   层间滑动角砾岩型     
Abstract: There are three types of gold deposits in west Shandong gold metallogenetic domain. The altered rock type (the Jiaojia type) and quartz vein type (the Linglong type) were discovered for several years. In recent years, a new type gold deposit, the interlayer sliding tectonic breccia type gold deposit, such as the Pengjiakuang and the Songjiagou gold deposits, has been discovered along the northeastern margin of Jiaolai Basin. The Pengjiakuang gold deposit occurs in a interlayer sliding fault zone between the conglomerate of Early Cretaceous Laiyang Formation and the metamorphic complex of Lower Proterozoic Jingshan Group along the margin of Jiaolai Basin, which was formed before Yanshanian volcanic period concerning with meteoric water and magmatic water. The minerogenetic epoch has been proposed about 100 Ma. The host rocks have been extensively subjected to pyritization, silicification, sericitization and carbonatization. Individual ore body has maximum length of 800 m, oblique extension of 500~700 m and gold grade of 1×10-6~43×10-6. Native gold is disseminated in silicified, phyllic or carbonatized tectonic breccia. A study on sulfur, carbon and lead isotope of gold ores and wall rocks shows that the sulfur may come from the metamorphic complex of Lower Proterozoic Jingshan Group, carbon from the marble of Jingshan Group, while a part of lead may come from the mantle. The mineralizing fluid is rich in Na+ and Cl-, but relatively impoverished in K+ and F-. According to the data from hydrogen and oxygen isotopic compositions (δ18OH2O=0.59‰~4.03‰, δDH2O=-97 5‰~-89.5‰), the conclusion can be reached that the mineralizing fluid of Pengjiakuang gold deposit was a kind of mixed hydrothermal solution which was mainly composed of meteoric water and magmatic water. A comparative study shows that the Pengjiakuang-type gold deposit, namely, the interlayer-sliding tectonic breccia type gold deposit, is different from the Jiaojia-type gold deposits and the Linglong-type gold deposits in the Jiaodong Block. It formed under an extensional tectonic background and located at interlayer-sliding fault zone along the margin of Mesozoic Jiaolai Basin. Also, the gold mineralization has closely genetic relationship with the alkaline magamtism.
Key wordsThe Pengjiakuang gold deposit   The Jiaolai Basin   Geological characteristics   Interlayer-sliding tectonic breccia type   
收稿日期: 1999-12-06;
基金资助:中国科学院创新工程项目KZCX1-Y-03和中国科学院黄金九五重大项目KZ951-A1-404-02-02专题资助.
引用本文:   
杨金中,沈远超,刘铁兵等. 2001, 胶东蓬家夼金矿床地质与地球化学特征. 地质科学, (1): 51-63.
Yang Jinzhong,Shen Yuanchao,Liu Tiebing et al. GEOLOGICAL AND GEOCHEMICAL CHARACTERISTICS OF PENGJIAKUANG GOLD DEPOSIT, EAST SHANDONG[J]. Chinese Journal of Geology, 2001, (1): 51-63.
 
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