Multi-source Metallogenic Information Extraction And Analysis Of Typical Orogenic Gold Belts In The Tibet Plateau

The orogenic gold belt of the Tibet plateau has a huge metallogenic scale,currently a hot research topic both at home and abroad.However,the poor natural conditions lead to the high cost of prospecting,and the prospecting is difficult.How to quickly identify multi-source ore-forming information of orogenic gold deposits of different metallogenic systems,how to delineate the remote sensing mineralization alteration zone of a single orogenic gold deposit,the internal cause of multi-source information anomaly and metallogenic information are important work for regional prospecting research.In this paper,parts of the Yarlung Zangbo River suture zone,the Ailaoshan tectonic shear zone,and the Tethys-Himalayas are selected as the research objects of the main collision convergence,late collisional tectonic transform,and post-collision extension stage mineralization systems.For remote sensing data,two multi-spectral data sources,ETM and ASTER,are selected to extract and analyze remote sensing alteration information and structural information at the regional scale.In the study of a single orogenic gold deposit,this paper selects the Nianzha gold deposit in the middle section of the Yarlung Zangbo River suture zone as a research example.Based on the C-A model,the fractal analysis of the geochemical measurement data of sediments was conducted to delineate the geochemical anomalies,and to deepen the cognition of metallogenic regularity through elemental symbiosis combination analysis.On the basis of fully grasping the continental collision metallogenic model of the Tibetan Plateau Plateau,the multi-source metallogenic information is superimposed and analyzed.This paper mainly achieved the following research results,this paper mainly achieved the following research results:(1)In different orogenic gold deposit metallogenic systems in the Tibet Plateau,the difference in ore-forming patterns leads to different multi-source ore-forming information,so orogenic gold deposits at different collision stages in the region have their own identification characteristics;(2)As a single orogenic gold deposit research example,an altered mineral index based on ASTER data is established in Nianzha,and used the "optimal density segmentation method" to quantitatively delineate the altered zone and constrain the prospecting target area.This method has certain universality;(3)Based on the superposition of multi-source information and geological background,analysis of the coupling relationship between multi-source information and mineralization can deepen the understanding of the metallogenic laws of different metallogenic systems in the Tibet plateau;(4)Different metallogenic systems in the Tibet Plateau have delineated gold and antimony metallogenic prospects,namely the Luobusha ophiolite mixed metallogenic prospects,the gold metallogenic prospects outside the Ailaoshan Daping gold deposit,Luozha-Come-Zha Xikang gold antimony metallogenic prospect.