| 西秦岭常家山地区水系沉积物地球化学特征及其地质意义 |
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| 引用本文： | 王斌,任涛,宋伊圩,杨可,王占彬,孙亚柯. 西秦岭常家山地区水系沉积物地球化学特征及其地质意义[J]. 现代地质, 2022, 36(3): 911-922. DOI: 10.19657/j.geoscience.1000-8527.2022.025 |
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| 作者姓名： | 王斌 任涛 宋伊圩 杨可 王占彬 孙亚柯 |
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| 作者单位： | 1.昆明理工大学 国土资源工程学院,云南 昆明 6500932.中国地质调查局 西安矿产资源调查中心,陕西 西安 710199 |
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| 基金项目： | 云南省万人计划“青年拔尖”人才项目;中国地质调查局项目“西秦岭岷县寨上金矿勘查”(ZD20220314);“全国金矿资源潜力评价”(ZD20220318) |
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| 摘 要： | 西秦岭成矿带北亚带是重要的多金属成矿单元。为缩小找矿靶区,在常家山地区开展了1:2.5万水系沉积物测量工作,对采集到的1 141件样品中的Au、Ag、As、Sb、Bi、Cu、Pb、Zn、W、Mo 10种元素进行核密度估算等数理统计分析,结果显示它们的浓度高于全国水系和区域水系沉积物的平均值,表明研究区成矿潜力大。通过因子分析得到F1(Bi、Cu、Zn)、F2(Au、As、Sb)、F3(Ag、Pb)、F4(W、Mo)4个主因子。使用浓度-面积(C-A)分形模型得到各元素和因子的异常阈值,并利用克里金插值法得到相应的地球化学空间分布图;结合区域控矿因素和异常分布特征圈定出Hz1、Hz2、Hz3 3处综合异常,前缘晕、近矿晕和尾晕显示出自西北向东南分布的趋势。水系沉积物地球化学异常分析结果表明,区内构造控矿特征明显,北西方向的礼县—闾井断裂是常家山地区有利的找矿部位。
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| 关 键 词： | 水系沉积物测量 地球化学特征 核密度估算 因子分析 分形模型 西秦岭造山带 |
| 收稿时间： | 2021-12-06 |
| 修稿时间： | 2022-04-20 |
Geochemical Characteristics and Geological Significance of Stream Sediments in Changjiashan Region,Western Qinling Orogen |
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| WANG Bin,REN Tao,SONG Yiwei,YANG Ke,WANG Zhanbin,SUN Yake. Geochemical Characteristics and Geological Significance of Stream Sediments in Changjiashan Region,Western Qinling Orogen[J]. Geoscience of Geosciences, 2022, 36(3): 911-922. DOI: 10.19657/j.geoscience.1000-8527.2022.025 |
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| Authors: | WANG Bin REN Tao SONG Yiwei YANG Ke WANG Zhanbin SUN Yake |
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| Affiliation: | 1. Faculty of Land and Resource Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China2. Xi’an Center of Mineral Resources Survey, China Geological Survey, Xi’an, Shaanxi 710199, China |
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| Abstract: | The northern sub-belt of Western Qinling Orogen is endowed with abundant polymetallic resource. To delineate mineral exploration targets, a 1:25,000 stream sediment geological survey was carried out in the Changjiashan district. Statistical analysis was performed from 1,141 samples for Kernal Density Estimation elements (Au, Ag, As, Sb, Bi, Cu, Pb, Zn, W, and Mo). Element concentrations are higher than the national and regional average, indicating metallogenic potential in the area. Element combinations of the four factors were obtained based on factor analysis, i.e., F1(Bi-Cu-Zn), F2(Au-As-Sb), F3(Ag-Pb), and F4(W-Mo). We obtained thresholds of geochemical elements and factor scores, and geochemical mapping via Concentration-Area (C-A) fractal modeling and Kriging interpolation, respectively. Combined with regional ore-controlling factors and anomaly spatial distributions, three polymetallic anomaly areas, i.e., Hz1, Hz2, and Hz3, were delineated. Geochemical halos comprise the supra-ore halo, near-ore hole, and sub-ore halo from northwest to southeast. Distribution of stream sediment geochemical anomalies indicates that all mineralization was fault-controlled, and the area close to the NW-trending Lixian-Lüjing fault at Changjiashan represents a favorable prospecting target. |
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| Keywords: | stream sediment survey geochemical characteristic kernel density estimation factor analysis fractal modeling Western Qinling Orogen |
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