CHARACTERISTICS AND METALLOGENIC REGULARITY OF ANTIMONY DEPOSITS IN INNER MONGOLIA

Based on the study of geological characteristics of antimony deposits in Inner Mongolia and typical antimony deposits, with comparison of the ore-controlling factors between typical antimony deposits in China, the paper discusses the metallogenic regularity of antimony deposits in Inner Mongolia from the aspects of metallogenic tectonic background, ore-bearing rock series and ore-controlling structure. It is considered that the antimony deposits in Inner Mongolia can be classified into hydrothermal type in clastic strata and volcanic hydrothermal type. The ore-bearing rock series in these deposits were mostly formed in Late Paleozoic Devonian-Permian, with the characteristics of nearly E-W linear distribution. The ore/mineralized bodies are mainly controlled by the nearly E-W-trending fault belt, and the mineralization may be related to the subduction-accretion orogeny during plate collision. The dark fine clastic rock series formed in the reduction conditions of littoral facies, neritic facies, bathyal facies or interactive marine-terrestrial sedimentary environment are the favorable horizon for ore-hosting rocks. The formation of antimony hydrothermal solution may be related to the deep mantle-mantle source tectonic magmatic activity.