Genetic types, ore-forming age and geodynamic setting of endogenic molybdenum deposits in the eastern edge of Xing-Meng orogenic belt
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摘要:
兴蒙造山带东缘是中国重要内生多金属成矿区，近年来已发现钼矿床20余座。依据矿床地质、地球化学特征和年代学成果，将该区内生钼矿床类型划分为斑岩型、接触交代热液型和中高温浅成热液型。初步确定斑岩型矿床形成与高钾钙碱性花岗质岩浆作用有关，而接触交代热液型矿床形成与钙碱性花岗质岩浆作用以及围岩性质有关，成矿作用主要发生在195~165Ma和115~110 Ma两个区间，成矿物质普遍具有壳幔混合源的特点；而其地球动力学背景分别与古太平洋板块俯冲欧亚大陆和伊泽奈崎板块俯冲欧亚大陆相适应。
Abstract:The eastern edge of Xing-Meng orogenic belt in China, is an important polymetallic metallogenic district, where more than 20 large-, medium-and small-scale Mo deposits have been found in recent years. According to geological features, geochemical characteristics and geochronology, the endogenic molybdenum deposits in the region are divided into porphyry type, contact-metasomatic hydrothermal type and medium-high temperature hydrothermal type. The research results show that porphyry deposits are associated with high-potassium calc-alkaline granitic magmas, while contact-metasomatic hydrothermal deposits are related to calc-alkaline granitic magma and the nature of host rocks. Metallogenic materials possess the characteristic of crust-mantle mixing source. The Mo mineralization in the study area mainly occurred in 195~165Ma and 115~110Ma. The corresponding geodynamic mechanisms responsible for the Mo mineralization in different times may be closely related to the subduction of paleo-Pacific plate and Izanagi plate towards the Eurasia continent, respectively.
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图 1
研究区区域地质和钼矿分布简图
Figure 1.
Map of regional geology and distribution of molybdenum deposits in the studied area
图 2
霍吉河、金场沟与成矿相关的花岗岩LA-ICP-MS 锆石U-Pb 年龄图
Figure 2.
Zircon LA-ICP-MS U-Pb diagram from Huojihe and Jinchanggou deposits
图 3
研究区主要钼矿床同位素年龄分布直方图
Figure 3.
Isotopic age distribution histogram of major Mo deposits in the studied area
图 4
研究区与成矿密切相关的花岗岩SiO2-K2O和ACNK-ANK判别图解(据Maniar et al.，1989)
Figure 4.
SiO2-K2O and ACNK-ANK diagrams of the granitoids in the studied area(after Maniar et al.，1989)
图 5
研究区与成矿密切相关的花岗岩SiO2-Ce和La/Sm-La图解
Figure 5.
SiO2-Ce and La/Sm-La discrimination diagrams of granite in the studied area
图 6
研究区与成矿密切相关花岗岩稀土元素球粒陨石配分图(a)和微量元素原始地幔蛛网图(b)(球粒陨石和原始地幔标准值据Sun and McDonough，1989)
Figure 6.
Chondrite-normalized REE distribution patterns(a)and primitive mantle-normalized trace element spider diagram(b)of granite in the studied area(normalization values after Sun and McDonough，1989)
图 7
研究区与成矿密切相关的花岗岩构造环境判别图(据Pearce et al.，1984)
Figure 7.
Tectonic setting discrimination diagram of granite in the studied area(after Pearce et al.，1984)
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