胶东地区金矿成矿规律及找矿潜力和方向

胶东地区金矿成矿规律及找矿潜力和方向

摘要：矿床形成后会经历不同形式的变化，区域隆升与剥蚀是影响矿床变化保存最为关键的因素之一。构造-热年代学是目前广泛运用于研究区域隆升剥蚀的一种重要手段，本文以我国最大金矿集中区——胶东西北部金矿及赋矿围岩玲珑花岗岩为研究对象，尝试将构造-热年代学引用到矿床成矿后变化与保存研究。胶东金矿早阶段成矿深度大于10km，中晚期成矿深度4~7km，根据剥蚀速度计算玲珑花岗岩剥蚀量仅为2.0~4.2km，远未达到金矿最大成矿深度。当前本区金矿勘探和开采深度普遍小于2km，因此深部至少还有1~5km深度空间具有金矿找矿潜力。

关键词： 胶东西北部金矿区；玲珑花岗岩；裂变径迹；隆升剥蚀；找矿潜力

Abstract: after deposit formed will experience different forms of change, and erosion is the effect of regional uplift deposits changes save the most crucial factor. Structure-hot is the chronology is widely used in research area denudation of uplift an important means in this paper, the country’s largest area in northwestern jiaodong gold-gold ore and fu surrounding rock and exquisite granite as the research object, try the structure-hot chronology reference to the metallogenic changes after research and preservation. The jiaodong gold mine early metallogenic depth is more than 10 km, metallogenic depth middle-late 4 ~ 7 km, according to erosion speed computing and exquisite granite erosion amount of just 2.0 ~ 4.2 km, far from reaching a maximum depth of gold mineralization. In the current gold exploration and mining depth generally less than 2 km, so deep at least 1 ~ 5 km deep space has gold prospecting potential.

Keywords: the jiaodong gold mining area in northwestern; Exquisite granite; Fission diameter mark; Uplift erosion; Prospecting potential

一、引言

矿床是复杂地质作用的结果，矿床形成后会经历不同形式和不同程度的变化。矿床学研究应兼顾矿床形成（成因）和矿床变化、保存（产出）两方面以提高矿产预测的能力。矿床形成后经历的变化受到各种地质作用的控制和影响，包括内力、外力和不同圈层间的相互运动影响。

花岗岩与成矿经常有密切关系，笔者认为对作为金矿赋矿围岩的花岗岩岩体进行裂变径迹构造-热年代学测试，获得其热历史演化与冷却剥蚀情况，从而可以揭示矿床剥蚀程度并预测成矿潜力与找矿方向。

胶东西北部地区是中国最重要的金矿集中区之一，赋矿岩石主要是中生代花岗岩类。据此，本文以玲珑花岗杂岩体以及金矿为研究对象，按剖面系统采集样品进行磷灰石裂变径迹构造-热年代学研究，获得花岗岩体隆升演化与冷却

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