Deep Structure Of Tibetan Niangre Ore Concentration Area Revealed By Deep Seismic Reflection Profile

The deep seismic reflection profile technology has been used as a vanguard technology for fine structure research of the lithosphere with the advantages of high detection accuracy and large depth of detection,and has achieved rapid development.The deep seismic reflection profiles have been mainly applied to the fine exploration of the continental lithosphere structure,and the research on the deep structure and the metallogenic dynamic background of the ore concentration area is not enough.Whether the distribution of ore deposits in the ore concentration area is controlled by fracture,the relationship between the deep fluid migration channel and the large rock mass,all of which are closely related to the crustal structure.It is necessary to understand the metallogenic process and background by revealing the fine structure in the deep part of the ore concentration area by deep reflection section.This paper deals with the deep reflection seismic data of the Tibet Niangre ore concentration area by using the targeted technology,and obtains the deep and shallow deep seismic reflection profiles.Combined with other geophysical data,it studies the background of the metallogenic background of the polymetallic ore area in the middle section of the Gangdise metallogenic belt in the Lhasa terrain of the Q:inghai Tibet Plateau.The key data support and scientific basis for solving the deep process of continental collision mineralization are obtained.The main results obtained in this article include:1.According to the characteristics of the seismic geological conditions and the original seismic data in the Niangre ore concentration area,the measures of static correction and noise suppression have been adopted to deal with the deep seismic reflection profile data,and a set of parameters and methods for the deep reflection data in the complex geological environment of the Qinghai Tibet plateau polymetallic ore collection area are summarized.2.The deep seismic reflection profile recognizes many geological phenomena such as multiple breakages in the shallow crust and bright spot reflection.By combining with regional geological information,the underground space structure in the middle section of the Gangdise metallogenic belt is revealed,which provides basic information for the study of the near ground surface quality environment of the polymetallic minerals,such as iron,lead and zinc,and so on.3.The deep metallogenic tectonic setting of the Niangre ore concentration area is revealed.Through deep seismic reflection section,the deep tectonic framework of the Tsing Du Niangre ore concentration area is explained,and the migration passage and storage space of the ore-forming fluid are detected,and the weak reflection region of the crust and mantle transition zone may be the passage of the mantle based magma into the crust.