鄂西高罗背斜张家坨铅锌矿床地质特征及区域找矿潜力分析

摘要

The Gaoluo area in Xuan�en country is the focus area of Western Hunan and Hubei lead-zinc ore belts,there is very excellent prospecting potential. The sedimentary characteristics and metallogenic characteristics of the ore-bearing rock series of Loushanguan Formation and Nanjinguan Formation in the study area in detail are analyzed,and previous re-search results of lead-zinc from the neighboring region is also analyzed in this paper. The conclusions show that in sedi-mentary stage,biological activity and seawater evaporation preconcentrated the ore-forming elements;in diagenesis and deuterogenic stage,underground thermal brine lixiviated,transported,filled and metasomasis the sedimentary layer rich in lead and zinc,and became bedded ore-body and stratiform-like ore-body sealed by the upper and lower non-permeable layer. In Yanshan period,strong folds formed in the study area,construct space constituted the channel of ore fluiding. Deposits formed in Caledonian were transformed. Yanshanian fluids gathered in the anticline core along the fault driven by the tectonic stress,susceptible driven by gravity to move to the lower,the more gentle tectonic position with host space to form deposits. The Zhongchengmiao-Shiziguan syncline core between Xianfeng anticline and Gaoluo anticline has a large-medium lead and zinc mine prospecting potential.%宣恩县高罗地区是湘鄂西成矿带中铅锌矿工作的重点区域，具有良好的找矿潜力。以张家坨铅锌矿床为例，分析了该区娄山关组三段和南津关组含矿岩系的沉积特征和成矿特征，综合前人的研究成果，得出结论：沉积阶段生物活动和海水蒸发对成矿元素进行了预富集，成岩及后生阶段，地下热卤水对富含铅、锌的沉积层进行溶滤、充填和交代，并被其上下非渗透层屏蔽形成层状、似层状矿体；燕山期，强烈的褶皱活动伴生的构造空间构成含矿流体运移和成矿的场所，早期矿体受到改造并新生了矿体，成矿流体受构造应力驱动聚集于背斜核部后，温压降低，易受重力驱动移向较低较平缓且具有容矿空间的构造部位富集成矿，中城庙-狮子关向斜轴部的水塘-曾家垱-斗宝山一带具备极大的铅锌找矿潜力。