Abstract:

The Chaling area is located at the southeastern Hunan Province, which is a major ore concentration area in south China metallogenic belt. In this region, there are complicated faults in the plutons (Dengfuxian, Xitian), wall rocks and cap rocks. What’s more, the distribution patterns of the element-associating geochemical anomaly are also complex. In this paper, through methods of fault-grade classifications, field survey and anomaly comparison, the relationship between the fault and the anomaly is discussed in order to obtain the distribution regularity of tungsten and tin. The conclusions can be drawn as follows: (1)Many second-class NE-striking faults develop along the first-class Laoshanao fault; these faults and the Laoshanao fault form in the same stress field; the second-class NE-striking faults are parallel to each other and many third-class joints develop between them with different directions; the second-class NE-striking faults and the joints constitute the riedel shear system. (2)In the plutons, there are obvious concentration focuses of tungsten-tin anomalies developing in joints of the second-class NE-striking faults and the third-class faults. (3)In the Cretaceous, the geochemical anomaly is controlled by the second-class faults and the Quaternary. (4)The anomaly is also related to the contact zone. The relationship between the fault and element geochemical anomaly, which is always helpful to reveal the ore-forming dome, can be a reference to deep mineral exploration.
Key words:southeastern Hunan; Chaling; fault; element geochemical anomaly

Key words: southeastern Hunan, Chaling, fault, element geochemical anomaly