PRELIMINARY STUDY ON DEEP GEOPHYSICAL EXPLORATION MODEL OF GOLD ORE FIELDS IN EASTERN SHANDONG, CHINA
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摘要: 胶东金矿田深部"第二富集带"找矿潜力巨大，但预测难度也大，其中一个问题是深部勘查目标难以识别。作为复杂成矿过程的产物，按经济指标划分的金矿体和规模更大的构造蚀变带，可以整体上作为深部地球物理勘查的目标，扩大目标地质体的规模，从而提高物探方法的分辨率。基于矿床地质特征、岩（矿）石物性参数及含矿构造岩相带的空间形态特点，将胶东地区金矿床分为三类：一维角砾岩型、二维蚀变岩型、二维石英脉型。依托"中生代岩浆核杂岩隆起—拆离带"控矿构造模式，应用含矿构造岩相带和地球物理方法相结合的工作模式，在玲珑—焦家、大庄子、蓬家夼等矿田开展深部找矿预测，为物探方法有效识别深部矿化带提供理论和技术支持。Abstract: The "second enrichment belt" in deep gold ore fields in eastern Shandong has great prospecting potential, but it is difficult to predict. One of the problems is that the target of deep exploration is hard to identify. As a product of complex metallogenic process, the gold ore bodies which are divided according to economic indicators and larger structural alteration zones, as a whole can be the goal of deep geophysical exploration. As a result, the scale of target geological bodies can be expanded, thus improving the resolution of geophysical exploration methods. Based on the geological features of the deposit, the physical parameters of the rock (ore) and the spatial characteristics of the ore-bearing structural lithofacies belt, the gold deposits in eastern Shandong are divided into three types: one-dimensional breccia type, two-dimensional altered rock type and two-dimensional quartz vein type. Relying on the ore-controlling tectonic model of "uplift and detachment zone of Mesozoic magmatic core complex" and combining the ore-bearing structural lithofacies belt with geophysical methods, the deep prospecting prediction is carried out in Linglong-Jiaojia, Dazhuangzi and Pengjiakuang ore fields, which provides theoretical and technical support for geophysical prospecting methods to effectively identify deep mineralized zones.
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表 1 胶东金矿床地球物理分类初步方案
Table 1. Preliminary geophysical classification of gold deposits in eastern Shandong
维度 构造岩相带 典型矿床 平面形态 空间形态 名称 地质标志 产状 物性异常 物探方法组合 一维 点状 柱状、筒状、管状 角砾岩相 含矿角砾岩筒 直立、陡倾 密度、电性 遥感、地震、大深度电法 角砾岩筒型金多金属矿床(五莲七宝山) 二维 带状 似层状 蚀变岩相 含矿构造角砾岩带 倾斜 密度、电性、放射性 遥感、地震、重力、磁法、大深度电法、放射性 蚀变岩型、角砾岩带型金矿床(焦家、三山岛、蓬家夼) 二维 线状 似层状 石英脉相 含矿石英脉 陡倾 密度 重力 石英脉型金矿床(玲珑、乳山) 
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