辽西凹陷与岩浆热液有关的大型金矿床的找矿模式及应用

Prospecting Model and Application of Large-scale Gold Deposit Associated with Magmatic Hydrothermal Solution in Liaoxi Sag

以辽西凹陷为有限研究区域,选取3个大型金矿床(柏杖子、金厂沟梁、排山楼)为研究对象,它们的成矿作用、成矿机制可统一用"构造—岩浆热液"的观点来解释。这类矿床在区域成矿上具备大的成矿空间域(广泛发育的矿源层或矿源岩、大型构造及活化、大的区域物化场)和多种成矿条件(多来源、多成矿活动、多期次叠加蚀变)。因此采用区域成矿上的"三大"和矿床成矿上的"三多"条件加之物、化、遥、找矿矿物学等其他综合信息,建立辽西凹陷大型金矿床的区域及矿床矿体综合信息找矿模式。并从矿床产出的构造位置、岩浆活动、蚀变分带等特征总结出今后大型金矿床找矿的重点主攻区域应在锦西—阜新和要路沟—锦西2个深大断裂所围成的角区内。

Liaoxi sag as a limited study area, choosing three large-scale gold deposits （Baizhangzi, Jinchanggouliang, Paishanlou） as the research objects, we found that structure-magmatic hydrothermal can explain the ore-forming process and mechanism of this kind of gold deposits. There are two conditions to form this kind of deposits： the first one is large mineralization spatial domain in local mineralization （widely developed source bed/rock, large-scale structure and activation, large local geophysical and geochemical field） ; the second one is different kinds of ore-forming conditions （ different kinds of sources, several ore-forming activities, overprints and alterations in different ages）. This paper build the prospecting model of area and ore deposit and body synthesized information of large-scale gold deposit in Liaoxi sag, by synthesizing the conditions which are mentioned above, and the information from geophysical prospecting, geochemical exploration , remote sensing, mineralogical, etc. It summarized that the main areas of prospecting of general large-scale gold deposit should exist in the triangle area formed by two deep-large faults （Jinxi-Fux- in fault and Yaolugou-Jinxi fault）, by synthesizing the characteristics of structural location, magmatic activity, alteration zonation of deposit productive area.