湖南东坡半隐伏岩体的侵入方向及其空间形态特征

东坡(千里山—王仙岭)半隐伏岩体是湖南郴州地区与锡钨、铅锌成矿关系密切的重要岩体。为了弄清它们的侵入方向,根据不同尺度的剩余重力异常中心的位置与出露岩体中心的位置,判断出岩浆的侵入方向;通过重力异常的二维、三维反演,揭示了千里山岩体、王仙岭岩体的连接关系、二维空间形态特征以及与围岩的接触关系;推断认为:形成王仙岭岩体的岩浆是由北东—东南—北西方向侵入的;形成千里山岩体的岩浆是由北东往南(西)方向侵入的。而且两个岩体在深部相连,并且呈大岩基产出。

Intrusion Direction and Spatial Morphological Characteristics of Dongpo Semi-concealed Rock Body in Hunan Province

The Dongpo semi-concealed rock body (Qianlishan-Wangxianling) is closely related to tin-tungsten and lead-zinc mineralization in Chenzhou area, Hunan Province. In order to clarify their intrusion direction, the intrusion direction of magma is judged according to the location of the residual gravity anomaly center and the exposed rock mass center at different scales. Through the two-dimensional profile and three-dimensional inversion of gravity anomaly, the connection relationship between Qianlishan and Wangxianling rock bodies, the two-dimensional spatial morphological characteristics and the intrusion direction of magma can be revealed. It is inferred that the magma that formed the Wangxianling rock body intruded from the NE-SE-NW direction, and the magma that formed the Qianlishan rock body intruded from the NE to the SW. Moreover, the two rock bodies are connected in depth and occurred as a large batholith.