准噶尔北缘浅成岩-构造蚀变岩型金矿的成矿特征

PRELIMINARY STUDY ON METALLOGENETIC CHARACTERISTICS OF SUPERGENE AND STRUCTURAL-ALTERED ROCKS GOLD DEPOSITS IN THE NORTHERN MARGIN, JUNGGAR

准噶尔北缘发现了一种较特殊的金矿化类型即浅成岩－构造蚀变岩金矿。这类金矿床主要产于晚古生代岛弧区，成矿作用与富钠浅成小岩体及以断裂为主的构造破碎蚀变具有密切联系。通过对其成矿背景、典型矿床及找矿标志的浅析，认为该类矿床一般形成于较大的金矿化带中，具有形成低品位、大矿量金矿床的前景。

A new kind of gold mineralization, named supergene and structural-altered rocks gold deposit has been discovered in the northern margin of Junggar. This kind of gold deposit is mainly formed in Later Palaeozoic island arcs and their minerogenesis is mostly controlled by both of a small sodium-rich supergene instrusive body and structural-broken alteration mainly related to fracture. By analysing its minerogenetic background, typical gold deposits and prospecting criteria, the authors think the size of every gold deposit itself is smaller, but the scale of its mineralizing zone related to these gold deposits is normally comparatively large. Therefore, it is believed that there exist better prospects related to low grode and huge amounts of gold ores in the northern margin of Junggar.