小秦岭金矿区水系沉积物重金属特征研究  

Heavy metal characteristics of stream sediments in the Xiaoqinling gold ore district

作　　者：张江华[1] 王葵颖 赵阿宁[1] 陈华清[1] 柯海玲[1] 刘瑞平[1] 

机构地区：[1]中国地质调查局西安地质调查中心,陕西西安710054 [2]陕西工程勘察研究院,陕西西安710068

出　　处：《中国地质》2013年第2期602-611,共10页Geology in China

基　　金：国土资源部公益性行业科研专项(201111020);中国地质调查局大调查项目(1212011014012)资助

摘　　要：在划分小秦岭金矿区水系流域的基础上,研究了不同水系沉积物中Hg、Pb、Cd、Cr、As、Cu、Zn七种重金属的含量水平、分布特征;从各个元素的主要来源出发,分析了重金属含量水平高低不同的原因,探讨了金矿开发对重金属含量变异的影响,提出影响水系沉积物重金属赋存、迁移的相关因素。结果发现:①从地域上看,小秦岭北麓水系沉积物重金属含量普遍高于南麓,而在北麓表现出"中间高、两侧低"的特点;②从元素含量差异看,小秦岭金矿区水系沉积物中Pb含量最高且偏离背景值的程度最大,其次是Hg,而Cr、As继续保持了低背景值的趋势。Based on the division of water systems in the Xiaoqinling gold ore district, the authors studied the concentrations and distribution of seven kinds of heavy metals i.e., Hg, Pb, Cd, Cr, As, Cu and Zn, in the stream sediments and, in the light of the source of each element, analyzed the causes for different concentrations of these elements and probed into the influence of the gold mining on the variation of heavy metal concentrations. On such a basis, the factors affecting the occurrence and migration of heavy metals in stream sediments were revealed. Some conclusions have been reached： 1. In the light of regional distribution, the heavy metal concentrations of the stream sediments at the northern foot of the Xiaoqinling Mountains are generally higher than those at the southern foot, and the concentrations at the northern foot show characteristics of ＂high in the middle and low on both sides＂. 2. In the light of the differences in element content in the stream sediments of the Xiaoqinling gold ore district, Pb has the highest content and most remarkably deviates from the background value, followed by Hg, whereas Cr and As continually maintain the low background values.

关 键 词：小秦岭 水系沉积物 重金属 异常 

分 类 号：P618.51[天文地球—矿床学] P595[天文地球—地质学]