西藏sedex型矿床赋矿盆地性质对成矿元素的制约作用  

The controls of the host basins on ore-forming elements from the sedex deposits in Xizang

作　　者：李金高[1] 王全海 郑明华[3] 周祖翼[1] 胡晓强[3] 姚鹏[4] 刘鸿飞 杨成玉 

机构地区：[1]同济大学,上海200092 [2]中国地调局西南项目办,四川成都610082 [3]成都理工大学,四川成都610059 [4]成都地质矿产研究所,四川成都610082 [5]西藏地勘局,西藏拉萨850000 [6]华北石油局新星石油公司三普,陕西咸阳712000

出　　处：《沉积与特提斯地质》2001年第4期11-20,共10页Sedimentary Geology and Tethyan Geology

摘　　要：“青藏高原热”的掀起 ,极大地提高了西藏境内基础地学的研究水平和认识程度 ,为正确把握西藏喷流型及其它类型矿产资源的战略地位奠定了良好的基础。在此基础上 ,通过对甲马、沙拉岗矿区的矿床学研究 ,笔者认为它们都受“盆、相、位”的严格控制 ,具有喷流沉积的一般特征 ,属sedex型矿床的范畴。但二者之间却又存在元素组分、矿物成分、结构构造等方面的明显差异。产生这种差异的根本原因在于其形成的大地构造背景和盆地性质不同。The hydrothermal sedimentation, diagenesis and mineralization may occur in various tectonic settings such as spreading zones, mid-oceanic ridges, trenches, island arcs, back-arc basins, continental rifts and intracontinental fault zones, especially in pericontinental aulacogens and deep swales on carbonate platforms. The Jiama polymetallic deposit and Shalagang antimony deposit have been addressed herein as two good examples. They are all assigned to the sedex deposits and the orebodies commonly appear as stratified and stratoid forms along the stratigraphic horizons. The formation and evolution,sedimentation, diagenesis and mineralization of the basins in which these deposits are hosted tend to be controlled directly or indirectly by the tectonism in south-central Xizang. The comparative study of the two deposits shows that the Jiama polymetallic deposit is located in the inter-arc shallow-marine basin on the active continental margins, whereas the Shalagang antimony deposit lies in the low divide deep-marine basin on the passive continental margins. The differences in tectonic settings are responsible for those in host rocks, elemental components, mineral compositions, types, textures and structures of ores.

关 键 词：西藏 SEDEX型矿床 赋矿盆地 成矿元素 结构 构造 沉积环境 大地构造 

分 类 号：P611[天文地球—矿床学]