Exploration prospect and post-ore denudation in the northwestern Jiaodong Gold Province, China: Evidence from apatite fission track thermochronology.
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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。通过磷灰石裂变径迹热年代学测试获得玲珑花岗岩距今110Ma以来的隆升演化历史,结果显示岩体剥蚀速率很小,平均0.0303±0.0044mm·a-1,自金矿形成后区域热-构造运动趋于平静,这对矿床的保存非常有利。胶东金矿成矿深度范围集中于4~10km,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,深部金矿找矿潜力良好。Abstract: Many ore deposits underwent different spatial changes after formation. Post-ore change and preservation is very important to ore deposit exploration. Regional uplift and denudation are critical factors controlling post-ore change and preservation of ore deposits. Tectono-thermochronology is an effective way to study regional uplift and denudation, quantitatively providing denudation rate and degree. This paper focused on gold deposits and host rock (Linglong granite) in the northwestern Jiaodong Gold Province, China. Apatite Fission Track (AFT) thermochronology was used to evaluate uplift and denudation history of Linglong granite since 110Ma. The results show that denudation rates are very small, with an average of 0.0303±0.0044mm·a-1, suggesting that the post-ore tectono-thermal event is gentle and very beneficial to ore preservation. According to granite denudation rate, the erosion depth was calculated 2.0~4.2km, far less than the largest mineralization depths mainly concentrated on 4~10km. Considering that the current depth of exploration and mining is less than 2km, the space with deep gold exploration and prospecting is promising.
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