| 中天山乌拉斯台地区矿化异常提取及评价 |
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| 引用本文： | 辛存林.中天山乌拉斯台地区矿化异常提取及评价[J].地质与勘探,2014,50(2):382-390. |
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| 作者姓名： | 辛存林 |
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| 作者单位： | 西北师范大学地理与环境科学学院，甘肃兰州； 防灾科技学院地震科学系，河北三河； 云南省地质调查院，云南昆明 |
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| 基金项目： | 国家自然科学基金（编号：41262001）、甘肃省科技支撑基金（编号：1104FKCA116）、甘肃省自然科学基金（编号：1010RJZA020）联合资助 |
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| 摘 要： | 以多重分形理论为基础,对中天山乌拉斯台地区铜多金属元素的岩屑测量数据,采用C-A法获得铜多金属的异常下限值,将其作为阈值进行指示克里格插值,绘制研究区的铜多金属地球化学异常图。研究显示,基于该方法获得的Cu矿化异常高值区主要集中在华力西早期第三侵入次的石英闪长岩和花岗闪长岩岩体中,受北西向和次级北东向断裂构造控制明显,该异常区可以作为寻找热液型铜多金属矿产的重要远景区。该方法对于地球化学数据空间变异性强烈的地区,较之普通克里格插值法具有更好的地球化学异常识别能力和高值信息重建能力,所得结果的最高累计频率值范围与已知矿化点的空间位置吻合度更高,在地球化学异常信息提取工作中具有推广意义。
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| 关 键 词： | 指示克里格法 C-A法 变异函数 浓度-面积模型 地球化学异常 |
| 收稿时间： | 2013/4/23 0:00:00 |
| 修稿时间： | 2013/8/23 0:00:00 |
The Extraction and Assessment of Anomalies of Mineralization in Wulasita Area of the Middle Tianshan |
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| Xin Cun-lin.The Extraction and Assessment of Anomalies of Mineralization in Wulasita Area of the Middle Tianshan[J].Geology and Prospecting,2014,50(2):382-390. |
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| Authors: | Xin Cun-lin |
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| Abstract: | Abstract: This paper calculates the threshold of geochemical data by using the concentration-area (C-A) medel, which is built on the talus sample survey data of Cu-poly metallic elements in Wulasitai field of Middle Tianshan, and then uses the threshold for the indicator kriging interpolation method. The results show that, high anomaly area mainly related with the granodiorite and quartz diorite of early Variscan being the most favorable metallogenic prospect area. This subdivision can also be used as an focus of future studies. Meanwhile, compared with inverse ordinary Kriging method, the highest rank of cumulative probability which obtained by indicator kriging mrthod can more effectively highlight the geochemical anomalies which associated with the known mineralization. Furthermore, for the strongly spatially variable data, indicator kriging method has more advantages in reconstruction of highly information and maintaining the robustess of variogram. |
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| Keywords: | indicator kriging multifractal geochemistry concentration-area model |
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