• 责任者：Xi Mingjie (Institute of Geophysical and Geochemical Exploration ; Chinese Academy of Geological Sciences ; Langfang 065000 ; China) ; Ma Shengming
• 刊名：Acta Geoscientica Sinica
• 出版年：2013
• 卷期：34(6)
• 关键词：水系沉积物测量 ; stream sediment surveys ; 铅锌矿床 ; lead-zinc deposit ; 分散元素 ; disperse elements ; 西藏 ; Tibet
• 页码：p.702-712
• 图表：7 illus., 6 tables, 29 refs.
• 分类号：1500
• issnNo：ISSN1006-3021
• isbnNo：CN11-3474/P

     The study of the characteristics of element geochemistry in stream sediments constitutes the basis of the regional geochemical prospecting. As the new indicators in geochemical exploration, the dispersed elements can play a remarkable role in the prospecting task. Due to the backward situation of the research work in Tibet, the previous regional geochemical exploration mostly laid emphasis on the study of the main ore-forming elements and useful associated elements, whereas researches on the dispersed elements were very insufficient. This paper reports for the first time the characteristics of the dispersed elements in 680 stream sediment samples collected from Tibet. From the regional point of view, Cd, Se and Te are concentrated obviously in steam sediments in thisarea, whereas other elements present homogeneous distribution. Compared with the average values of the dispersed elements of the steam sediments in Yangbajain-Nyingzhong area, Cd, In, Se and Te are considerably concentrated in the Permian Luobadui Formation, which is probably caused by the weathering of such metal sulfides as sphalerite and galenite in the Luobadui lead-zinc-copper deposit, whereas the enrichment of T1 is probably related to the hydrothermal sedimentation of the geothermal resources in Yangbajain-Nyingzhong area. The content of the dispersed elements in steam sediments present in intrusive rocks of different ages is close to the average content of the study area, only with the weak enrichment of In and T1. As the new indicators of geochemical exploration, Cd, In, Se and Te can indicate the locations of lead-zinc ore bodies, thus providing the geochemical foundation for the prospecting of lead-zinc polymetallic deposits in this area.