Abstract:
Objective Xiayingfang gold deposit in Eastern Hebei Province represents a typical magmatic hydrothermal mineralization system, characterized by well−developed hydrothermal alteration halos that exhibit a clear genetic link to gold mineralization. This study systematically analyzes the characteristics of hydrothermal alteration halos and aims to decode their ore−forming implications.
Methods This study focused on sericite−quartz alteration halos, examining the petrological and geochemical characteristics of halos with varying alteration intensities, and exploring elemental migration and enrichment patterns and their impact on gold mineralization.
Results The results demonstrate that alteration intensity significantly influences element mobility. Although different rock structures (namely porphyritic and granite structures) show consistent trends in alkaline element enrichment and depletion of other elements, the extent of alkali rich deficit varies, indicating that rock structure also has a certain influence on alteration intensity.
Conclusions During sericitization, ore−forming elements (Au, Ag, Pb) are extensively enriched, and the degree of alteration shows a positive correlation with Au enrichment. This indicates that pyritic sericitization stage is the main period for gold precipitation in the Xiayingfang gold deposit, serving as a key indicator for gold prospecting.
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