熊耳山—外方山地区中生代花岗质岩石对金成矿作用的约束

发布时间：2018-01-26 21:32

本文关键词： A型花岗岩构造环境金成矿作用中生代熊耳山-外方山　出处：《中国地质大学(北京)》2015年硕士论文　论文类型：学位论文

【摘要】：熊耳山-外方山地区是我国重要的金矿产地之一。本文选取花山、五丈山、合峪和太山庙等岩体及典型金矿床为研究对象,通过对研究资料的收集整理以及野外室内工作,对其成岩成矿时间进行了厘定,并分析中生代花岗质岩体对金成矿作用的约束,取得如下主要成果和认识:(1)将太山庙岩体分为粗粒花岗岩、粗粒花岗斑岩及细粒花岗岩,测得其锆石U-Pb年龄分别为126Ma,118.9±5.3Ma和114.2±2.9Ma。(2)研究认为花山、五丈山、合峪及太山庙岩体为同一个源区,显示出较好的岩浆演化趋势。花山、五丈山、合峪岩体为I型花岗质岩体,形成于后碰撞环境,太山庙岩体为A型花岗岩,形成于后造山环境。(3)认为槐树坪金矿其形成于由挤压向伸展转换的构造环境。成矿期前以钾化为主要特征;成矿期细分为稀疏浸染状(星点状)黄铁矿阶段,石英—黄铁矿脉阶段及多金属硫化物阶段;成矿期后以石英—碳酸盐脉为主。(4)研究指出岩体的依次侵位指示熊耳山—外方山地区的构造环境从晚侏罗世(约161Ma前后)开始进入由挤压向伸展转换阶段,并一直持续到早白垩世(约126Ma前后),以太山庙岩体的侵位为标志,进入板内伸展阶段。五丈山岩体侵位标志着构造活动进入有利于金成矿作用的阶段,花山及合峪岩体的岩浆活动为熊耳山—外方山地区金成矿作用提供成矿流体,太山庙岩体的侵位标志着有利于金成矿作用的构造阶段结束。
[Abstract]:- XIONGERSHAN Waifangshan area is one of the most important gold producing areas in our country. This paper chooses Huashan, five Zhang Shan, Heyu and Taishanmiao such as rock and typical gold deposits as the research object, through the research on data collection and field indoor work, the diagenesis and mineralization time were determined, and the analysis of constraints gold mineralization of the Mesozoic granitic rock, made the following main achievements: (1) the Taishanmiao rock is divided into coarse grained granite, granite porphyry and coarse grained granite, measured the zircon U-Pb ages were 126Ma, 118.9 + 5.3Ma and 114.2 + 2.9Ma. (2) of Huashan Mountain, five feet Heyu, and Taishanmiao rock for the same source area, showed good magmatic evolution trend. Huashan, five Zhang Shan, Heyu granitic pluton is I type, formed in the post collision environment, the Taishanmiao pluton is A type granite, formed in a post orogenic environment. (3). For the Huaishuping gold formed from compressional to extensional tectonic environment transformation. The premetallogenic with potassium as the main characteristics; metallogenic period is subdivided into sparse disseminated (star point) pyrite stage, quartz pyrite veins and polymetallic sulfide stage; mineralization period in quartz carbonate vein (4. It is pointed out that the rock sequence) of emplacement of XIONGERSHAN Waifangshan area indicates the tectonic environment from Late Jurassic (about 161Ma) began to enter the stage of transition from compression to extension, and continued until the early Cretaceous (about 126Ma), the Taishanmiao pluton emplacement marked into intraplate extensional stage five. Zhang Shan emplacement marks into the tectonic activities conducive to gold mineralization stage, Huashan Heyu rock and magmatic activity for gold mineralization in XIONGERSHAN Waifangshan region provide ore-forming fluid, the Taishanmiao rock emplacement marks The tectonic stage which is beneficial to the gold mineralization is over.

【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.51

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