摘要
白乃庙金矿区的节理包括东西向剖面共轭剪切节理，北东—北西向平面共轭剪切节理，北北东向剖面共轭剪切节理。与之相应的断层有近东西向逆断层，北东向和北西向的平移断层以及北北东向的斜冲断层。此外，北东向断层的低序次构造亦呈北北东走向，但其性质为平移断层。东西向、北东和北西向断裂形成于南北向挤压构造应力场。它们控制了主要含金石英脉展布。其中，２６号主矿脉就位于北东向平移大断裂———白乃庙断裂的北北东向低序次平移断层中。尽管矿脉均就位于南北向挤压作用形成的主断裂系统及低序次构造中，但它们均属成矿前构造。在成矿期，深部岩浆侵位引起的局部构造应力场使成矿前构造张开控制了含金石英脉的就位。而北北东向的斜冲断层为成矿后构造。
There are EW direction conjugate shear joints in cross section, NE and NW direction conjugate shear joints in plane and NNE direction conjugate shear joints in cross section in Bainaimiao gold mine area,Inner Mongolia. There are also EW direction reversed fault, NE and NW direction strike-slip faults as well as NNE direction oblique reversed fault. In addition, the secondary generation faults of NE direction strike-slip fault also run in NNE direction, but they are strike-slip fault. Although all ore veins take their place in the faults formed by SN direction compression, they belong to pre-mineralization faults. During mineralization, partial tectonic stress field caused by magma intrusion made the faults open and controlled ore-bearing quartz veins.
出处
《世界地质》
CAS
CSCD
1999年第2期58-65,共8页
World Geology
关键词
金矿床
控矿构造
含金石英脉
白乃庙金矿
Bainaimiao gold deposit, gold-bearing quartz vein, ore-controlling structure, joint
