云开地区中生代成矿地质背景及成矿动力学机制研究  

Study of Mesozoic Metallogenic Geological Setting and Dynamic Mechanism in Yunkai Area

作　　者：蔡明海[1] 战明国[1] 彭松柏[1] 孟祥金[1] 刘国庆[1] 

机构地区：[1]宜昌地质矿产研究所,湖北宜昌443003

出　　处：《矿床地质》2002年第3期264-269,共6页Mineral Deposits

基　　金：地质矿产部 九五 "重点科技攻关项目(95_0 2_0 0 7);中国地质调查局 2 0 0 0年大调查项目(199910 2 0 0 85 0 0 3)部分成果

摘　　要：文章通过对云开地区地质构造、矿床时空分布以及中生代花岗岩类岩石的岩石学及地球化学特征的综合研究,认为区内中生代岩石圈构造经历了二叠—三叠纪之间的碰撞挤压、侏罗纪的构造转换及白垩纪的拉张伸展 3个阶段的演化过程。An integrated study of geological structural characteristics, granite petrology and time_space distribution regularity of deposits indicates that the Mesozoic lithosphere of Yunkai area experienced three tectonic evolution phases: the collision between 201 and 277 Ma, the tectonic transformation from compression to extension between 154 and 160 Ma, and the extension between 80 and 100 Ma. The ore_forming processes were concentrated in mid_Jurassic and Cretaceous, controlled successively by the tectonical transformation of lithosphere in early Yanshanian and the further spreading and extension of late Yanshanian. The tectonic transformation of the lithosphere was related to its own increasing heat flow value. The extending and thinning of the lithosphere is the basic factor responsible for the Mesozoic massive ore_forming processes in this area. The distribution and location of the deposits were controlled by the transformation of local dynamic system, and the formation of the deposits resulted from the transformation of different dynamic systems.

关 键 词：中生代 云开地区 构造转换 成矿作用 动力系统转换 时空分布 花岗岩 

分 类 号：P611[天文地球—矿床学]