| 大陆动磁变化对成矿元素富集的影响——以吉林夹皮沟矿集区为例 |
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| 引用本文： | 孙忠实,邓军,王培福,杨立强,王建平,王庆飞.大陆动磁变化对成矿元素富集的影响——以吉林夹皮沟矿集区为例[J].地质科学,2006,41(3):365-377. |
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| 作者姓名： | 孙忠实 邓军 王培福 杨立强 王建平 王庆飞 |
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| 作者单位： | 1. 吉林大学地球科学学院, 长春, 130061;2. 中国地质大学地球科学与资源学院, 北京, 100083 |
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| 基金项目： | 国家自然科学基金（批准号：40272051）和国家自然科学重点基金（批准号：40234051）联合资助. |
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| 摘 要： | 多次交变的应力引起岩石磁性的变化称之为动磁。本文以吉林夹皮沟矿集区为例,通过磁力与成矿元素之间吸引或排斥关系,应力与岩石磁化率和应力与岩石剩余磁化强度等变换规律,探求大陆动磁变化对成矿元素富集的下列影响。1)当铁矿层或磁铁石英岩层褶皱时,金元素易在磁铁矿含量高、动磁强度大的部位(即褶皱转折端或两翼)富集。2)对非铁磁性介质,构造透镜体中的含金性既与低压区有关也与高压区有关,两者共性是沿磁能加大的方向有利于金元素的富集。对含矿围岩则相反,岩石磁性强、弱与岩石含金量呈反比。3)流体内非铁磁性物体动磁的变化对成矿元素富集的影响,主要表现在物体的总力—位移—剩磁—运行轨迹—成矿元素分异和富集的对应关系上。4)大陆动磁频度变化对成矿元素富集的影响,反映为同一构造带大陆碰撞频度与动磁强度呈反比,元素富集不明显;而不同方向构造叠加的频度与动磁强度呈正比,有利于元素富集。这些影响将拓宽和加大大陆动力学与成矿作用间的研究内容和深度。
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| 关 键 词： | 大陆动磁 成矿元素 分异与富集 吉林夹皮沟矿集区 |
| 文章编号： | 0563-5020（2006）03-0365-13 |
| 收稿时间： | 2004-03-30 |
| 修稿时间： | 2005-01-18 |
INFLUENCE OF VARIATION OF CONTINENTAL DYNAMIC MAGNETISM ON METALLOGENETIC ELEMENTS' ENRICHMENT: AN EXAMPLE FROM THE JIAPIGOU ORE CONCENTRATING AREA, JILIN |
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| Sun Zhongshi,Deng Jun,Wang Peifu,Yang Liqiang,Wang Jianping,Wang Qingfei.INFLUENCE OF VARIATION OF CONTINENTAL DYNAMIC MAGNETISM ON METALLOGENETIC ELEMENTS'' ENRICHMENT: AN EXAMPLE FROM THE JIAPIGOU ORE CONCENTRATING AREA, JILIN[J].Chinese Journal of Geology,2006,41(3):365-377. |
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| Authors: | Sun Zhongshi Deng Jun Wang Peifu Yang Liqiang Wang Jianping Wang Qingfei |
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| Institution: | 1. Department of Earth Science, Jilin University, Changchun 130061;2. Department of Geosciences and Mineral Resources, China University of Geosciences, Beijing 100083 |
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| Abstract: | Dynamic-magnetism meant that the alternately varied stress resulted in magnetic changes in rocks. Based on magnetic repulsion or magnetic gravitation relations between magnetic force and metallogenetic elements, quantitative change between stress and rock magnetization rate, stress and rock remnant magnetization intensity, the paper, taking the Jiapigou ore deposits concentrating area in Jilin as an instance, discussed the continental dynamic-magnetism having an influence on metallogenetic elements' enrichment. The main views were as follows. 1)Gold was easy enriched in place of the content of magnetite being high and strength of dynamic-magnetism being big. In case of iron ore or magnetite quartzite being folded, gold should be enriched in the hinge end or limbs of fold. 2)In non-magnetic medium plate, it was favorable for gold to concentrate in tectonic lens along direction of magnetic energy increasing in both the low and high pressure areas. The wall rocks showed an opposite tendency: gold contents in rocks inversed the rock's magnetic strength. 3)Dynamic-magnetism influenced metallogenetic elements' enrichment in diamagnetic medium in liquid, which manifested mostly in the corresponding relation of overall stress of diamagnetic object, displacement, remanence, moving track and differentiation-concentration of metallogenetic elements. 4) Frequency of continental dynamic-magnetism influenced metallogenetic elements' enrichment too, namely, frequency of continental collision in the same tectonic belt inversed dynamic-magnetic strength so as to concentrate not obviously, while frequency of multiple faults in different strikes was direct to that, which was favorable to elements' concentration. These results might further develop and deepen the study fields on continental dynamics and metallogenesis. |
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| Keywords: | Continental dynamic-magnetism Metallogenetic elements Differentiation and concentration The Jiapigou ore deposits concentrating area in Jilin |
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