摘要
秦岭泥盆系成矿带是我国重要的有色金属基地。礁硅岩套则是区内重要的含矿岩石组合。笔者在陈先沛 (1 986)礁硅岩套原始定义基础上 ,通过对礁灰岩、硅岩和中 -基岩性脉岩特征分析 ,提出依礁灰岩与硅岩的特征及空间关系划分礁硅岩套亚类 ,并认为区内中 -基性脉岩不能标志成矿期沉积盆地处于高地热环境 ,因而不是礁硅岩套的必然组成部分。文中将礁硅岩套划分为礁侧型和礁内型两个亚类 ,与其中赋存之矿床成因有一一对应关系。即礁侧型礁硅岩套赋存热水沉积 -轻微改造型多金属层控矿床 ;礁内型礁硅岩套赋存沉积再造型层控矿床。
The devonian ore forming belt of Qinling is the main source of nonferrous metals in China. Reef siliceous rock suite is one of the most important ore bearing rock suite in this ore forming belt. Through feature analysis of reef limestone, siliceous rock and medium basicity dykerock, it is put forward that compartmentailzing reef siliceous rock suite into subdivision depends on the space relation of reef limestone and siliceous rock. The medium basicity dyke rock couldn't mark high geothermal circumstance in sedimentary basin during metallogenetic epoch, therefore, it isn't a component of reef siliceous rock suite. The subdivisions of reef siliceous rock suite and origines of ore deposit were one to one correlation, that's to say, hot water sedimentary deposit was stored in outer reef type of suite and remoulded strata bound deposit in inner reef type.
