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投稿时间：2014-11-02 修订日期：2015-07-20 网络发布日期：2015-10-29
中文摘要:玲珑金矿田171号脉赋存于招平断裂北段破头青断裂中,在其深部探明金资源储量150余吨,确定其为超大型破碎带蚀变岩型金矿床。为了揭示构造与成矿、深部矿与浅部矿、石英脉型矿与蚀变岩型矿等的关系,为深部找矿提供典型实例和理论依据,文章通过大量矿区地质勘探、野外地质调查和区域地质综合研究,剖析了矿床特征,揭示了构造控矿规律。171号金矿脉深部共有7个金矿体,均为盲矿体。其中,1711号主矿体埋深120～1700 m,呈似层状、大脉状分布,沿走向及倾向显舒缓波状。矿体总体走向60°,倾向SE,倾角36.5～43.5°。矿体长2500 m,斜深510～3100 m,平均厚度4.23 m,平均金品位2.71×10-6,矿石主要为黄铁绢英岩型(蚀变岩型)。矿脉和矿体受断裂构造控制,矿化、构造、蚀变分带具有一致性。由控矿断裂的主裂面至远离主裂面,构造变形强度由强变弱,蚀变强度和矿化强度也由强变弱。招平断裂是一条切割早期韧性剪切带的脆性断裂,总体呈舒缓波状展布,大部分地段发育于早前寒武纪变质岩系与侏罗纪玲珑型花岗岩之间,断裂上盘脆性变形较弱,下盘脆性变形带宽大,是沿不同时代地质体之间发育的左行铲式正断层,类似于拆离断层,是胶东白垩纪伸展构造的组成部分。玲珑金矿田是典型的石英脉型金矿产地,但大型金矿床多为赋存于断裂构造中的蚀变岩型金矿床,石英脉型金矿床与蚀变岩型金矿床是同一构造系统中不同构造位置的产物;一般在主断裂中赋存蚀变岩型金矿床,在主断裂下盘的次级张裂隙中产出石英脉型金矿床。胶东以正断层为主的伸展构造系统为大规模成矿提供了有利条件,构造、蚀变分带和不同类型金矿床的关系是金矿找矿的重要标志。
Abstract:No. 171 lode of the Linglong gold orefield occurs in Potouqing fault which belongs to north segment of Zhaoping fault, with more than 150 tons gold reserves in its deep-seated position, thus constituting a superlarge gold deposit of the fracture zone altered rock type. In order to reveal the relationships between the tectonics and ore formation, deep ore and shallow ore, and quartz vein type ore and altered rock type ore, so as to provide typical examples and theoretical basis for deep ore prospecting, the authors, through a comprehensive study of deposit exploration and field geological investigation, analyzed the characteristics of the deposit and the structural ore-controlling regularity. Totally 7 orebodies of the deep-seated gold deposit of No. 171 lode are blind orebodies. Among them, No. 1711 main orebody is located at the depths of 120 to 1700 meters. It is stratoid or large vein in form and displays a gentle wave shape along its strike and dip, striking NE 60° and dipping SE, with dip angles of 36.5° to 43.5°. The orebody extends 2500 m along its strike, and 510 m to 3100 m in its inclining direction. Its average thickness is 4.23 m, and the average grade is 2.71×10-6. The ore types of gold mainly include beresitized rock and beresitized cataclasite. The lode and orebodies mainly occur in Potouqing fault, and present zoned patterns in mineralization, alteration and structures. The strongly mineralized zones agree with strongly altered and tectonically fractured zones from the main plane of the ore-controlling fault outward. Zhaoping fault is a brittle fracture, which cuts early ductile shear zone and exhibits a gentle wave shape along its strike and dip. It occurs along the contact zone between the early Precambrian metamorphic complex and Jurassic Linglong type granites, its hanging wall exhibits weaker structural deformation, while its footwall assumes stronger structural deformation, suggesting normal fault property, being an extensional fault controlling the gold deposit. Though the Linglong gold orefield is a typical quartz vein type gold mineralization area, the ore type of the large gold deposits is mainly fracture zone altered rock type. The quartz vein type gold mineralization and altered rock type gold mineralization are products of different tectonic positions of the same structural system. Generally the altered rock type gold mineralization occurs in the main fracture, while the quartz vein type gold mineralization occurs in the secondary tensile crack of the main structural footwall. The extensional fault provided favorable ore-hosting structure for extensive gold deposition. The alteration, structures and relationship of gold mineralization types are important indicators in search for gold deposits.
keywords:geology deep-seated gold deposit Zhaoping fault Potouqing fault altered rock type gold mineralization quartz vein type gold mineralization Linglong gold orefield
ZHANG PiJian,SONG MingChun,LIU DianHao,DING ZhengJiang,HU PeiQiang,YANG GuoFu,WANG HaiBo.2015.Features of deep-seated gold orebodies of No. 171 lode and structural ore-controlling action in Linglong gold orefield, Shandong Peninsula[J].Mineral Deposits34(5):855~873