Material field structure of ore-forming elements and deep prospecting potential of Xitieshan lead-zinc deposit, Qinghai Province

Abstract

The Xitieshan lead-zinc deposit in Qaidam, Qinghai Province, is a large-scale SEDEX deposit in China. The host rocks are mainly marble and schist, the marble-style ore-bodies mainly exist in the shallow part and the schist-style ore-bodies mainly exist in the deep part. This paper systematically describes the spatial symbiosis relationship between lead-zinc ore-body and pyrite in different ore types and the three-dimensional spatial change rule of ore-body spatial shape. The material field structure and change trend of Pb, Zn, Ag, Au and other ore-forming elements in the mining area are systematically analyzed by the local singularity analysis method and correlation analysis method. Both analysis methods show different structural characteristics of the material field of elements, that is, Pb, Zn and Au are still obviously enriched to the depth along the side direction of the ore-body as a whole, and are not affected by marble. In the schist, the concentration of elements is still very strong, and Ag is obviously discontinuous in the mineralization space from the shallow to the deep. The element zoning in the horizontal direction of Xitieshan lead-zinc mine is Mn-Fe-S-Ag-Pb-Zn-S-Au from the far (hydrothermal center) to the near, and Mn-S-Ag-Pb-Zn-S-Au from the top to the bottom in the vertical direction. At the same time, we systematically study the change rule of element enrichment structure in the ore forming field, analyze and discuss the prospecting potential in the deep part of Xitieshan.

Keywords

• xitieshan lead-zinc deposit
• ore-body spatial shape
• the material field structure of ore-forming element
• qinghai province