Abstract:

Haojiahe copper deposit is a typical representative of sandstone deposits in Chuxiong Basin, Yunnan. On the basis of large scale tectonic geological mapping, this article uses the theory and method of ore fields of geomechanics to select the typical fractures to identify the mechanical properties of fracture surface, divides the construction period of time and set the tectonic systems, and also makes a detailed description on the relationship between the geological characteristics of the faulted geology and the oreforming in different period time and from different direction. Since Yanshanian, this area has experienced the transition from NE-SW trending→near EW trending→NW-SE trending→near S-N trending to the main constructional compressive stress. In late Yanshanian, NW trending structure has control function on the inchoate metallogenic material activation, migration and reconfiguration and enrichment of copper; between late Yanshanian and early Himalayan, near S-N trending structure prompted into enrichment of metallogenic material. The morphology of ore body emerged to be lamellar and stratoid; in the early Himalayan, NE trending structure promoted the ore fluid to extract a great number of mineral substance then enriched them again and formed rich ore body; in the middlelate Himalayan, near EW trending structure caused damage to the ore body.

Key words: fault, tectonic stress evolution, mineralization, Haojiahe copper deposit, Chuxiong Basin, Yunnan