Formation Geo-mechanism of Botanogeochemical Anomaly of 460 Au Deposit in Beishan Area of Gansu(PDF)
《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]
- Issue:
- 2016年第06期
- Page:
- 766-777
- Research Field:
- 基础地质与矿产地质
- Publishing date:
Info
- Title:
- Formation Geo-mechanism of Botanogeochemical Anomaly of 460 Au Deposit in Beishan Area of Gansu
- Author(s):
- SONG Ci-an; SONG Wei; DING Ru-fu; LEI Liang-qi
- 1. Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration, Guilin University of Technology, Guilin 541004, Guangxi, China; 2. College of Earth Sciences, Guilin University of Technology, Guilin 541004, Guangxi, China; 3. School of Computers, Guangdong University of Technology, Guangzhou 510006, Guangdong, China; 4. Beijing Research Institute of Geology for Mineral Resources, Beijing 100145, China
- Keywords:
- botanogeochemical anomaly; Au deposit; Reaumuria soongrica; Haloxylon ammodendron; geo-mechanism; warer-salt transport; desert; Gansu
- PACS:
- P593
- DOI:
- -
- Abstract:
- In order to understand the formation geo-mechanism of botanogeochemical anomaly in arid desert, the samples were collected from bedrock (ore), cover and plants of 460 Au deposit in Beishan area of Gansu, and the contents of water, pH and Eh values, element contents were measured, and the formation geo-mechanism model was built. The results show that a variety of soluble components, ore-forming and associated elements carried by groundwater and soil water move upward vertically by the action of driving forces including the external potential evaporation, water content and its gradient, and absorption and transpiration of plants in Au deposit covered by arid desert; K, Na, Cl and Ca are vertically rich in the upper part, and the ore-forming and associated elements (Au, Ag, Cu, Pb, Zn, As, Sb and Mo, etc.) are vertically rich in the lower part; laterally, the ore body and its upper covering layers, which are relative oxydic and acidic, are relatively high content areas of Au, Ag, Cu, Zn, As, Sb and Mo, but the bilateral bedrock and its upper covering layers, which are relative reductive and alkaline, are relatively high content areas of K, Na, Cl, Ca, Mg and Mn; the plants in the upper part of the ore body absorb more elements (Au, Ag, Cu, As and Mo, etc.), and the botanogeochemical anomaly is formed; the depths and matrix types of elements and water absorbed by plants with different depths of roots are not the same, so that the element association and contents absorbed by plants are different; the formation of botanogeochemical anomaly in arid desert is mainly related with the underground and soil waters which transport ore-forming and associated elements from the lower part to the upper part, so that the root of plant can absorb the elements; the element combination and strength of geochemical anomaly in the plants with different depths of root are different.
Last Update: 2016-12-01