太行山中段城南庄一带隐伏岩体及找矿前景分析

Analysis of the Concealed Rock Mass and Ore-Search Prospect in the Chengnanzhuang Area in the Middle Section of the Taihang Mountains

麻棚和赤瓦屋岩体都位于太行山中段热液金属矿成矿区内,在其周围已发现石湖石英脉大型金矿等60余处热液型矿床(点),其深部和外围可能存在找矿前景。本文通过探讨太行山中段城南庄一带遥感环形构造和重力负场特征与金属矿床和岩体的耦合关系,从城南庄卫星式-多层蘑菇群式遥感环形构造群、重力负场、中酸性岩脉侵入和温泉五种证据,推测城南庄深部存在比麻棚和赤瓦屋岩体大近六倍、面积约700 km 2的中酸性隐伏岩体—城南庄隐伏岩体。城南庄隐伏岩体边界基本与布格重力负异常边界吻合,呈长轴北东向宽缓带状展布,向南西方向倾伏,北侧埋深较浅、南侧埋深较深。城南庄隐伏岩体边部(特别是产状缓外倾,具有良好成矿空间的区域)和顶部与围岩的接触带位置、环形构造形成的晚期“小岩体”内部及附近位置和中酸性岩脉附近位置是寻找热液型矿床的有利部位。

Both the Mapeng and Chiwawu bodies lie in the central Taihang Mountains,around which more than 60 magmatic hydrothermal metallic deposits(spots),such as the Shihu quartz vein large-scale gold deposit,have been found.It is speculated that there may be ore-search prospect at depth beneath them or in their peripheral areas.This paper examines the coupling relationship between remote sensing ring structure and negative gravity field characteristics and metal deposits and rock mass in the Chengnanzhuang area of the middle section of Taihang Mountains.From five pieces of evidence,i.e.,the remote sensing satellite-like multiple-layer mushroom group ring structure group,negative gravity field,intermediate-acid dike intrusion and hot spring,it is inferred that there is a intermediate-acid concealed rock mass in the deep subsurface beneath Chengnanzhuang,which is nearly six times larger than that of Mapeng and Chiwawu rock masses,covering an area of about 700 km 2.The boundary of Chengnanzhuang concealed rock mass largely coincides with that of Bouguer gravity anomalies,which spreads in a wide and gentle belt with a long axis in the NE direction,and dips to the SW direction,with shallow burial depth in the north and deep burial depth in the south.The edge of Chengnanzhuang concealed rock mass(especially the area with gentle extraversion and good metallogenic space)and the contact zone between the top and the surrounding rock and the interior and vicinity of the late"small rock mass"formed by the ring structure and the vicinity of the intermediate acid rock vein are the favorable locations for the exploration of magmatic hydrothermal metallic deposits.