摘要
得尔布干森林沼泽区的景观特征是冬季寒冷,夏季降雨集中,中低山沟谷长而平缓,植被发育,土壤A层和水系沉积物中富泥炭,土壤呈弱酸性、弱还原环境。铅锌矿床形成的异常从岩石、土壤C层、土壤A层到水系沉积物元素含量降低,呈逐步分散。水系沉积物中Pb、Zn元素含量随粒度变细而降低,Ag、有机碳含量增高。水系中泥炭沉积物可吸附活动态金属元素,在背景地段可形成次生富集和“假异常”。有机质影响水系沉积物异常,为干扰因素,应消除有机质影响。水系沉积物中碎屑沉积物能较好反映矿化异常。确定合理采样介质、密度,采样到位,可提高中大比例尺地球化学勘查效果。
The north part of Deerbugan metallogenic belt in the northeastern China is located in the frigid zone, where vegetation growth are well developed and peat is rich in soils and stream sediments. Metallogenic element contents decrease from rocks, soils to stream sediments. When grain size gets from coarse to fine in stream sediments, lead and zinc contents reduce, and organic carbonate and silver contents increase. Peat in stream sediment can adsorb activity metal element to form false anomaly. Detrital sediments in stream can well reflect anomaly related with mineralization.
出处
《地质与勘探》
CAS
CSCD
北大核心
2005年第6期80-83,共4页
Geology and Exploration
基金
国土资源地质大调查项目(编号:2000120130087)资助
关键词
森林沼泽景观
次生异常
分散富集作用
forest-swamp landscape, secondary anomaly, dispersion and enrichment
