江西钨矿床“多位一体”模式与成矿热动力过程

THE "MULTI-POSITION IN ONE" MODE AND DYNAMIC MECHANISM OF MINERALIZATION OF TUNGSTEN DEPOSITS IN JIANGXI

以江西大量的钨矿床勘查研究资料成果为基础,以张天堂—西华山钨矿带为典型,建立了钨矿床"多位一体"模式。该模式的核心是以成矿花岗岩为主因,由不同类型的钨矿床组成的具有成生联系的构造—岩浆—成矿体系。重点展示了脉状钨矿床的四维结构与定位规律以及多样的矿床垂直分带模式。同时通过对脉状钨矿床形成的热动力过程观察研究,揭示了区域水平挤压扭动与诱发的局部垂直内应力场交替活动、岩石剪切破裂与扩容充填交替进行的整个成矿过程,及其对钨矿床结构形式与时空分布规律的约束作用。

Taking the Zhangtiantang-Xihuashan tungsten band as an example, this paper proposes a ＂multi-position in one＂ mode for tungsten deposits based on lots of explorations for tungsten deposits in Jiangxi. The core of the mode is the structure-magma-metallogenic series with genetic relation, composed of different kinds of tungsten deposits and with metallogenetic granite as its main factor. It focuses on displaying the four-dimensional structure of vein-type tungsten deposits and rules on orientation as well as various modes of vertical zoning in deposits. Meanwhile, based on obserbation of the thermodynamic process of vein-type tungsten deposits, this mode reveals the alternation of zone-level extrusion and twist with induced part-vertical inner stress field, and cutting and fracture of rocks with their expanding and recharging. It also shows constraint of the process on the whole structure of tungsten deposits and their temporal and spatial distribution.