关键词: 构造特征, 构造发展, 金矿

Abstract: The spatial occurrence state of gold ore body in Longtan mining area is mainly controlled by SN direction fracture-fault system in the area. Through the analysis of the fracture-fault interspersed cutting relationship in the mining area，it is considered that the SN direction fracture-fault in the area is two groups of X-type torsional fractures with small intersection angle and nearly SN direction associated with the Cale⁃ donian cycle Chengongpai inverted anticline. Under the action of the NE-NNE direction tectonic stress in the Yanshan period，the X-type torsional fractures further expand and penetrate，becoming the ore-bearing structure of the mining area. The EW direction faults in the area were formed in the early Yanshan period and alternately developed with NE-NNE direction faults，mainly pre-mineralization faults. The late Yansha⁃ nian mineralization ended，showing strong fault activity，generating a series of NE-NNE and EW direction destructive fault structures.The fracture-fault structure in the area is characteried by multi-stage，compres⁃ sion-torsion-tension-torsion.

Key words: structure characteristics, structural development, gold mine