| 嫩江上游第四纪砂金矿控矿条件和富集规律的初步研究 |
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| 引用本文： | 王瑞山.嫩江上游第四纪砂金矿控矿条件和富集规律的初步研究[J].海洋地质与第四纪地质,1996,16(4):87-94. |
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| 作者姓名： | 王瑞山 |
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| 作者单位： | 中国科学院长春地理研究所 |
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| 摘 要： | 在论述了嫩江上游区域地质背景后，总结了该区砂金矿形成的控矿条件和富集规律。提出了决定砂金矿形成的主要因素是丰富的砂金物质来源，有利的外营力作用，适宜的新构造运动和良好的沉积环境，而且要经历搬运－沉积、再搬运－再沉积的复杂过程，才能达到工业要求的富集程度。
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| 关 键 词： | 砂金矿 金矿床 控矿条件 富集规律 第四纪 |
STUDY ON THE CONTROLLING FACTORS ANDENRICHMENT LAWS OF QUATERNARY PLACER GOLD INTHE UPPER REACHES OF THE NENJIANG RIVER,CHINA |
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| Wang Ruishan.STUDY ON THE CONTROLLING FACTORS ANDENRICHMENT LAWS OF QUATERNARY PLACER GOLD INTHE UPPER REACHES OF THE NENJIANG RIVER,CHINA[J].Marine Geology & Quaternary Geology,1996,16(4):87-94. |
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| Authors: | Wang Ruishan |
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| Abstract: | The eastern slope of the Greater Xing'an Mountains and southern slope of the Yile-huli Mountains are covered with primary forests and a lot of swamps, and traffic here isawfully difficult.Thus,for quite a long time,this region was poorly studied by geolo-gists, In recent years,we have been studying the geologic background and metallogenicmechanism of Quaternary placer gold in this region.We think that the metallogenics of Quaternary placer gold in the region was in mul-ti-stage and controlled by the following factors. The main resources of placer gold are o-riginal mineralized points,widespread Hercynian granite and tectonic breccia. Due to neo-tectonic movement,this region has kept rising and meantime slightly eroded since LateQuaternary period.Both wide and narrow river valleys and the sharp changes of theirstrikes,controlled the hydrodynamic conditions. In the Quaternary,climate alternatedbetween cold and warm,which was convenient for the weathering of gold-bearing rocksand the release of gold.The placer gold enrichment areas are the typical rift valleys of magnitude 2-3. Theplacer gold was enriched in the middle and lower layers of gravels which belong o relicsediments near or in the main stream,and in the upper layers of debris.The placer goldtakes tabular,grain and schistose shapes. Their sizes change to some extent from upperto lower reaches of rivers.In the profile,the lower the placer gold is located,the biggertheir sizes are and the higher the content of gold in the sediments. |
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| Keywords: | Nenjiang River placer gold controlling factors |
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