超大型会泽富锗铅锌矿复合成因

THE COMPOSITE GENESIS OF HUIZE SUPER-LARGE PB-ZN DEPOSIT RICH IN GE

会泽富锗铅锌矿,是近年老矿山深部找矿取得重大突破的典范,而其成因则是当前研究、讨论的热点。笔者认为该矿之形成,既非“MVT型”,亦非“VMS型”,而是与深部隐伏燕山期酸性岩有关的中温岩浆热液叠加、改造、富化的复成因矿床。自加里东期起长期处于张裂环境。深部昭通-弥勒硅镁层隆起,既是幔源玄武岩(热地幔柱)上涌的前奏,又为深部矿源上升创造畅通空间。与多旋回活动的小江深断裂相沟通的NE向矩形断裂网,是导矿、输矿、储矿的有利构造。继火山热液成矿之后,伴随燕山期褶皱、断裂和深部酸性岩浆的上升,发生第二期叠加矿化,矿石中伴生与酸性岩有关的元素组合,并以与酸性岩有关的锗富集为特征。

The Huize Pb-Zn deposit rich in Ge is a typical model of important breakthrough of the ore prospecting in the deep part of old mine in recent years. The study and discussion of its genesis have become the present hot subject. We think it is a ore deposit with composite genesis of hydrother- real superimposition, reformation and concentration of middle T magma related to the deep buried Yanshanian acid magmatic rock, which is neither ＂MXT type＂ nor ＂VMS type＂. It had been in a tension faulting environment for a long time since Caledonian. The Zhaotong - Mile deep Si-Mg bed rise not only was the precursor of rise of mantle - derived basalt （ thermal mantle column）, but also created the unblocked space for the rising of deep ore source. The NE rectangle fault net linking up with the Xiaojiang multicycle deep fault is the advantage structure of ore transmission and storage. After the metallogenesis of volcanic thermal fluid, following the Yanshanian folding, faulting and rising of deep acid magma, the superimposition metallogenesis of 2nd period took place, the ore had a set of dement paragenesis related to the acid rock, which is characterized by the Ge concentration related to acid rock.