| 老挝平然地区水系沉积物测量地球化学特征及找矿意义 |
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| 引用本文： | 雷传扬,;李瑞峰,;赵保顺,;赵桂秋.老挝平然地区水系沉积物测量地球化学特征及找矿意义[J].物探与化探,2014(3):453-460. |
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| 作者姓名： | 雷传扬 ;李瑞峰 ;赵保顺 ;赵桂秋 |
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| 作者单位： | [1]成都理工大学地球科学学院,四川成都610059; [2]秦皇岛通联集团,河北秦皇岛066004; [3]华北地质勘查局第四地质大队,河北秦皇岛066013; [4]河北省地质矿产勘查开发局,河北石家庄050081 |
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| 基金项目： | 成都理工大学矿物学、岩石学、矿床学国家重点（培育）学科建设项目（SZD0407） |
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| 摘 要： | 1∶5万水系沉积物测量显示,平然地区矿化异常是一个以Cu、Ni、Co异常为主,伴随有Cr、V、Ti等的多元素组合异常,体现了基性—超基性岩石的成矿专属性。对元素分布特征、单元素异常特征、异常元素组合特征进行了研究,得出该区异常主要受区域性NW向断裂构造和基性—超基性岩石控制。对平然地区水系沉积物测量数据聚类分析表明,15种元素可以分为三类:Ni、Cr、Cu、V、Co、Zn、Ti为一类,反映了与基性—超基性岩有关的元素分布、富集特征和相关矿化信息;As、Sb、Pb为一类,反映了与中低温热液作用有关的矿化信息;剩余元素的相关性差,归为一类。平然地区F1主因子可能代表了与基性—超基性有关的Cu、Ni、Co矿化。对平然地区3806个样品分别计算F1因子得分,得分大于2的607个样品分布特征与Cu、Ni、Co异常分布特征大致吻合。因此,Cu、Ni、Co异常区域及F1因子得分大于2的样品所在区域的重叠处应该是以Cu、Ni、Co为主的重点找矿区域。
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| 关 键 词： | 平然地区 聚类分析 因子分析 水系沉积物测量 老挝 |
Geochemical characteristics of Pingran area in Laos based on stream sediment survey and their prospecting signifivance |
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| Institution: | Lei Chuanyang, Li Ruifeng, Zhao Baoshun, Zhao Guiqiu ( 1.Geoscienee institute, Chengdu University of Technology, Chengdu 610059 , China ; 2. Qinhuangdao Tonglian Group, Qinhnangdao 066004, China ;3. No.4 Geologcial Team of North China Geological Exploration Bureau, Qinhuangdao 066013, China; 4.Hebei Bureau of Geo-Exploration and Mineral Development, Shijianzhuang 050081 , China) |
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| Abstract: | Pingran area is located in the Ma Jiang-Xam Nua island arc metallogenic belt, and the metallogenic condition of magmatic copper-nickel sulfide deposits is excellent. 1 ∶ 50 000 stream sediment survey around the Pingran area of Laos revealed an anomaly combination of multiple elements dominated by Cu, Ni and Co accompanied by Cr, V and Ti, reflecting the metallogenic specialization of the basic-ultrabasic rocks. The authors used the method of factor analysis and clustering to analyze the data of 1：50000 stream sedi-ment survey in Pingran area,and made a geological interpretation of the deposit. It is suggested that the anomalies from the geochemical survey are associated with the mineralization along a series of NW-trending fracture zones and the basic-ultrabasic rocks. Cluster analy-sis of the stream sediment geochemical data of Pingran area shows that fifteen kinds of trace elements can be grouped into three types, i.e. Ni, Cr, Cu, V, Co, Zn and Ti belong to the first type,As, Sb and Pb to the second type,and the rest to the third type. The first type reflects elemental distribution, accumulation characteristics and related mineralization information of mafic-ultramafic rocks, whereas the second type reflects the combination of ore-forming elements at low-medium temperature. The primary factor of stream sedi-ment geochemical element F1 may represent Cu, Ni and Co mineralization of mafic-ultramafic rocks. There are 607 samples with the factor F1 scores higher than 2 among all the 3806 samples from Pingran area. Distribution characteristics of the factor F1 score anoma-lies are roughly consistent with those of Au,As and Cu anomalies in Pingran area. Thus,the overlapped portion between the Cu, Ni and Co anomaly area and the area where factor F1 scores are higher than 2 should be the key ore-prospecting target dominated by Cu, Ni and Co. |
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| Keywords: | Pingran area cluster analysis factor analysis stream sediment survey Laos |
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