粤西长坑金银矿区硅质岩的地质地球化学特征及成因探讨

GEOLOGY-GEOCHEMISTRY AND GENESIS OF SILICOLITES FROM CHANGKENG Au-Ag DEPOSIT,WEST GUANGDONG,CHINA

下石炭统梓门桥组硅质岩是粤西长坑金银矿床的直接容矿岩石。本区硅质岩内层纹状、多孔状、同生角砾状等沉积组构发育，岩石化学成分、微量元素及稀土元素等地球化学特征与加拿大沙利文（Ｓｕｌｌｉｖａｎ）热液沉积岩等世界著名的热水沉积硅质岩相似，属于热水沉积成因。

The zimenqiao Formation silicolites of Lower Carboniferous is the country rock of Changkeng Au-Ag deposit. In the silicolites at this area, the lamellar, vesicular and contemporaneous brecciated structure are very developed. The compositions of major, trace and rare earth elements for the silicolites are similar to those of many famous hydrothermal silicolites,such as Sullivan hydrothermal sedimentary rock in Canada. The Changkeng silicolites are of hot water deposit genesis.