| Fluidization： An Important Process in the Formation of the Qiyugou Au-bearing Breccia Pipes in Central China |
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| 作者姓名： | ZHANG Yuanhou ZHANG Shihong Franco PIRAJNO |
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| 作者单位： | [1]College of Earth Sciences, Jilin University, Changchun, Jilin 130061, China [2]State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China [3]Geological Survey of Western Australia, 100 Plain Street, Perth, WA6004, Australia |
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| 基金项目： | We would like to thank Han Jun and Zhao Yinghao, a deputy manager of the Jinyuan Gold Company in Luoyang for their help in the field work. Zhang Yuanhou also would like to thank Mr. D. J. Kirwin for supplying unpublished data about breccia pipes. This study was financially supported by the National Natural Science Foundation of China （grant No. 40032010B）. |
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| 摘 要： | Fluidization processes based on experiments are reviewed to gain some useful insights and comparisons with those that occur in hydrothermal systems. Field and petrographic work, and microscope observation were carried out on samples from the Qiyugou Au-bearing breccia pipes from the East Qinling region, Henan Province. Evidence from macro- and micro-textures suggests that the style of breccias in the Qiyugou area can be grouped into three types： （1） jigsaw fit-stockwork texture, in which the interval between clasts is marked by fractures or filled with calcite or quartz veins; （2） larger breccias that are supported by smaller breccias, rock flour and alteration materials; in this type clasts moved over short distances, creating open spaces; （3） fluidized texture, where the clasts of different lithologies have rounded shapes. These observations are compared with those resulting from experiments on fluidization processes. The results of this comparison suggest that fluidization is an important geological process in the formation of the Qiyugou Au-bearing breccia pipes and gold mineralization. In addition, fluidization processes such as expansion, bubbling, slugging, channeling and spouting must have contributed to the formation of the pipes and were conducive to the development of gold mineralization. In the Qiyugou breccia pipes, gold mineralization occurs as disseminations, in stockwork veins, and open space infills. The ore zones form subparallel sheets that are nearly perpendicular to the walls of the pipes.
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| 关 键 词： | 河南 祈雨沟 含金角砾岩筒 形成 液化过程 矿化作用 |
| 收稿时间： | 2006-03-10 |
| 修稿时间： | 2006-11-06 |
Fluidization: An Important Process in the Formation of the Qiyugou Au-bearing Breccia Pipes in Central China |
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| Authors: | ZHANG Yuanhou ZHANG Shihong and Franco PIRAJNO College of Earth Sciences Jilin University Changchun Jilin China State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Beijing China Geological Survey of Western Australi Plain Street Perth WA Australia |
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| Abstract: | Fluidization processes based on experiments are reviewed to gain some useful insights and comparisons with those that occur in hydrothermal systems. Field and petrographic work, and microscope observation were carried out on samples from the Qiyugou Au-bearing breccia pipes from the East Qinling region, Henan Province. Evidence from macro- and micro-textures suggests that the style of breccias in the Qiyugou area can be grouped into three types: (1) jigsaw fit-stockwork texture, in which the interval between clasts is marked by fractures or filled with calcite or quartz veins; (2) larger breccias that are supported by smaller breccias, rock flour and alteration materials; in this type clasts moved over short distances, creating open spaces; (3) fluidized texture, where the clasts of different lithologies have rounded shapes. These observations are compared with those resulting from experiments on fluidization processes. The results of this comparison suggest that fluidization is an important geological process in the formation of the Qiyugou Au-bearing breccia pipes and gold mineralization. In addition, fluidization processes such as expansion, bubbling, slugging, channeling and spouting must have contributed to the formation of the pipes and were conducive to the development of gold mineralization. In the Qiyugou breccia pipes, gold mineralization occurs as disseminations, in stockwork veins, and open space infills. The ore zones form subparallel sheets that are nearly perpendicular to the walls of the pipes. |
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| Keywords: | fluidization breccia pipe gold mineralization Qiyugou Cretaceous Henan Qinling China |
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