Abstract:

To optimize the prospecting target area in Jinshuikou, Dulan County, Qinghai Province, a 1:50,000 stream sediment survey was carried out based on understanding the geological characteristics of the area. Based on the original measured data, the contents of nine trace elements including Au, As, Sb, Bi, Hg, Co, Cr, Ni, and Zn are statistically analyzed by using the regional concentration coefficient (RCC) and other characteristics parameters. It is concluded that Zn and Au have great metallogenic potential. The R-type cluster analysis, correlation analysis, and R-type factor analysis of nine elements were carried out by using statistical software SPSS25. Four ore element combinations were divided, including F1(Co-Cr-Ni), F2(Au-Bi-Zn),F3(As-Sb), and F4(Hg). The contrast anomaly method is used to calculate the anomaly lower limit of each element and element combination. Surfer15 software is used to compile the element and element combination contrast data into an anomaly map. Combined with the characteristics of element anomaly and metallogenic geological conditions, five prospecting targets are delineated. The abnormality of the No.1 polymetallic minerali-zation in the No.1-1 target area was verified, and the chemical analysis of the picked samples showed that the contents of zinc and total iron reached the lowest industrial grade. The exploration trench project was carried out on the No.2 and No.3 polymetallic mineralization bodies in the No.1-2 target area. After sampling and analysis, it was shown that the contents of some manganese and zinc had reached the boundary grade, and the total iron content was close to the boundary grade, and gold had a certain degree of metallogenic potential indicates that the Jinshuikou area has a large metallogenic potential of zinc, iron, gold and manganese.

Key words: stream sediment, geochemical characteristics, lining value anomaly method, prospecting potential, Dulan County, Qinghai Province