胶东金矿陆内构造岩浆核杂岩隆起-拆离带蚀变成矿

发布时间：2018-04-08 10:21

本文选题：胶东金矿　切入点：岩浆核杂岩　出处：《地学前缘》2017年02期

【摘要】：胶东金矿是全球级别的大型金矿床,与世界范围内绿岩带型金矿明显不同,矿床以中生代强烈活化改造绿岩带的壳源深熔花岗岩为成矿岩体,具有地台构造活化的独特成矿特征。前人注重板块俯冲、造山作用等构造环境研究,但这里需要强调的是,胶东金矿在陆内构造环境中形成。本文特别注重岩浆侵入作用及其热液交代蚀变成矿的这一特殊过程。研究开展野外观测,依据五条1∶5万长达220km的实测剖面,编制了胶东莱州—招远地区1∶25万构造蚀变岩相成矿图,并由此提出"胶东陆内构造岩浆核杂岩隆起-拆离带蚀变"的成矿模式。此模式认为,在东亚区域反钟向剪切构造体制下,构造应力场首先引起莫霍面的变化和起伏,形成了北东向和斜列展布的地幔隆起和凹陷。这一壳幔结构的变化控制了中生代交代重熔岩浆发育的区带。例如,胶西北莫霍面凹陷区带,发育北北东分布的玲珑杂岩体。花岗岩的成岩构造测量与分析显示,形成了"玲珑花岗杂岩核"及其岩浆穹隆构造。在胶东群等变质岩与花岗岩的接触带叠加了区域剪切断裂破碎带,断裂破碎带的构造测量表明,它们在岩浆固结期或更晚发育了上盘下滑的正断层活动。就是在这些剪切拆离带,形成了多期次、多方向构造破碎且同步发生了大规模的岩浆期后热液交代蚀变成矿作用。在胶东西北部宽达1.5km或更宽的断裂破碎同步叠加的热液交代蚀变作用,形成了巨大的"玲珑-焦家式"石英脉-蚀变岩金矿床。这一"陆内岩浆核杂岩隆起-拆离带"成矿模式不仅对胶东金矿成矿研究具有推动作用,而且可以指导多层次深部外围找矿。
[Abstract]:The Jiaodong gold deposit is a large gold deposit in the global level, and worldwide greenstone belt gold deposits in the Mesozoic is obviously different, strong activation crust anatectic granite greenstone belt for metallogenic rock transformation, has unique metallogenic features of platform structural activation. The previous focus on plate subduction, tectonic environment research orogeny, but here the need to that is, the Jiaodong gold deposit formed in intracontinental tectonic environment. We pay special attention to intrusive magmatism and hydrothermal metasomatic ore into this particular process. Research on field observation, based on the measured section five 1: 50 thousand up to 220km, the preparation of the Laizhou Zhaoyuan area, Jiaodong 1: 250 thousand tectonic alteration rock into the mine map, and thus put forward the metallogenic model of Jiaodong intracontinental tectonic magmatic core complex uplift detachment zone alteration ". According to this model, in the East Asian region anti clock shear tectonic system, tectonic stress The first variation caused by the force field and fluctuation of Moho, forming a mantle uplift NE and echelon and depression. The change of structure of crust mantle metasomatism in controlling the Mesozoic remelting magma development zone. For example, northwest of Moho depression zone, the development of NNE distribution exquisite complex rock mass of granite. Tectonic measurement and analysis showed that the formation of the "Linglong granitic complex nuclear and magma domal structure. In Jiaodong group metamorphic rocks and granite contact zone superimposed on the regional shear fracture zone, fracture tectonic belt measurement showed that their magma consolidation or later developed period of decline is hanging wall fault activity it is on this. Shear detachment zone, the formation of multi period mineralization, hydrothermal metasomatic alteration and multi direction structural fracture and synchronous massive magma. In the northwest of Jiaodong to 1.5km wide or wider off Crack hydrothermal metasomatic broken synchronous superposition variable, forming a "Linglong Jiaojia type" giant quartz vein and altered rock gold deposits. The intracontinental magmatic core complex uplift detachment zone metallogenic model not only for the mineralization of the gold deposit in Jiaodong has a role in promoting, but also can guide the multi-level deep prospecting in the periphery.

【作者单位】：中国地质科学院地质力学研究所;中国地质大学(北京)地球科学与资源学院;
【基金】：国家自然科学基金项目(40972061) 全球巨型成矿带找矿勘查方法技术研究(12120113102100) 长江中下游基底结构与导矿-控矿要素研究(1212010813051) 山东省国土资源厅项目(鲁地调合[2012]33号) 国土资源部项目(2014BAB05B00) 全国危机矿山接替资源找矿项目(200799095) 矿床地球化学国家重点实验室项目(200803)
【分类号】：P618.51

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