摘要
以金窝子金矿带为例,重点研究东天山地区戈壁覆盖层的分带结构、成分、性质和成因,以及金等成矿元素在干旱景观区表生迁移与矿化信息的传递机制。通过垂直剖面分析查明,戈壁覆盖层主要由坡—冲积层和冲—洪积层互层构成,其中坡—冲积层属当地风化产物,包含局部矿化信息,称为砾土戈壁;而冲—洪积层为运积物。两层均普遍经受戈壁化作用,形成以石膏为主的钙积层障。两互层均包含金等元素的矿化信息:在大比例尺详查找矿中采集坡—冲积成因的砾土戈壁层粗粒级(20～40目),能够揭示局部矿化地段;而在小比例尺区域地球化学测量中采集冲—洪积层中的细粒级(-160目)样可以圈定区域金矿化带。
This paper deals with composition, structures and genesis of Gobi-overburden and transmission mechanism of mineralization information in dry landscape area as an example of Jinwozi gold metallogenic belt. By means of experimental survey and geological section investigation, it is demonstrated that Gobi overburden is formed mainly from interbedding of the eluvium-slope wash and alluvial-flood deposit layers. The eluvium-slope wash layers are results of local bedrock weathering, and contain mineralization information. The alluvial-flood deposit layers represent a transported overburden. These two layers both underwent the processes of Gobization, and formed a vertically zoning structure with Ca-deposit (mainly gypsum) layer. At the small-scale soil survey, sampling alluvial-flood deposit layers with -160 mesh fractions can be used to locate regional metallogenic belt. At the large-scale survey, sampling eluvium-slope wash layers with 20～40 mesh fractions is more useful to outline local mineralization.
出处
《地质与勘探》
CAS
CSCD
北大核心
2003年第6期90-93,共4页
Geology and Exploration
基金
中国地质调查局项目(编号:DKD9904005)
国家攻关项目(编号:2001BA609A-03)资助。
关键词
化探
戈壁覆盖层
矿化信息
找矿方法
砾土戈壁
金表生迁移
Gobi-overburden,eluvium-slope wash layer,surface migration of gold,Ca-deposit layer,Jinwozi gold mineralizing belt,eastern Tianshan
