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胶西北是我国最大的黄金矿集区,不仅黄金储量巨大,而且成矿时间集中(115±5)Ma。研究认为燕山运动以来,华北东部地区进入了地幔热柱演化阶段;胶西北形成了莱阳地幔亚热柱及其外围郭家店、艾山、盘石店等幔枝构造体系。深源含矿流体通过地幔热柱→地幔亚热柱→幔枝构造→有利构造扩容带,迁移到幔枝构造的脆韧性-韧脆性剪切带、侵入岩体的内、外接触带、密集的构造裂隙带、各种脉岩与围岩的接触带等有利部位集聚成矿,从而构成以幔枝构造为中心的金成矿密集区。该文以郭家店幔枝构造研究为例,分析了成矿作用,归纳了成矿模式。
Northwest Jiaon is China’s largest gold ore district, not only a huge gold reserves, and mineralization time (115 ± 5) Ma. The study shows that since the Yanshan movement, the eastern part of North China has entered the evolutionary stage of the mantle plume and the mantle plume has been formed in the Laiyang mantle and its surrounding Guojiadian, Anshan and Panshidian areas. Deep-source ore-bearing fluids migrate to the ductile-ductile-brittle shear zone of the mantle branch through the mantle thermal column → mantle sub-thermal column → mantle branch structure → favorable tectonic expansion zone, and invade into the inner and outer contact zones of the rock mass. Tectonic fissure zone, all kinds of vein rock and the contact zone of surrounding rock and other favorable sites for the accumulation of mineralization, thus forming the mantle branch structure as the center of the gold mineralization intensive area. Taking the study of mantle structure in Guojiadian as an example, this paper analyzes the mineralization and summarizes the metallogenic model.