武当-桐柏-大别成矿带区域成矿特征与找矿前景展望

中国地质调查局及时跟踪武当-桐柏-大别成矿带找矿成果,经调研与论证将其列为国家级成矿带。该成矿带夹持于华北和扬子地块间,存在新元古代浅变质火山-沉积岩等6类重要沉积成矿建造,裂谷、区域隆起、深大断裂、剪切带等构造控矿特征突出,新元古代和燕山期两次岩浆作用成矿意义大,变质成矿作用强。矿床主要受矿源建造、燕山期中酸性岩浆侵入活动、岩相古地理、后生改造等因素制约,空间上有"北西西成带,北东东成行"和多种共生分布规律,时间上存在燕山等5个成矿高峰期。预期金、银、铜、铅、锌、钼等主攻矿种的找矿潜力巨大。

Regional Metallogenic Characteristics and Ore Prospecting Outlook of Wudang-Tongbai-Dabie Metallogenic Belt

China Geological Survey follows the ore-exploring results of the Wudang-Tongbai-Dabie metallogenic belt in time and ranks it as a national metallogenic belt after research and argumentation. Sand- wiched between the North China and Yangtze craton, there exists 6 types of important sedimentary metallo- genie formation in this metallogenic belt, such as Paleozoic low metamorphic vocalic-sedimental rocks, be- sides, structural ore-controlling characteristics is remarkable, including rift, regional uplift, deep faults and shear zone. The Paleozoic and Yanshanian magmatism are of ore-formation significance and metamorphic ore-formation is obvious. Deposits are mainly controlled by factors such as ore sources formation, Yanshanian magmatism, paleogeograpby and epigenetic changes. The deposits form a belt in NWW-trending and lines in NEE-trending and muhiple deposits coexist together in space while there exists 5 peaks of mineralization in time such as Yanshanian period. The ore-exploring potential of some main mineral species such as gold, sil- ver, copper, galena, sphalerite and molybdenum is great.