新疆阿拉套山东段晚古生代侵入岩活动特征及其成矿意义

发布时间：2018-05-28 08:13

本文选题：新疆阿拉套山 + 阿尔夏提　；参考：《中国地质大学(北京)》2015年硕士论文

【摘要】：阿拉套山位于中国新疆北西部与哈萨克斯坦国界附近,境内外地质背景和成矿地质条件相似,形成了大量的金属、非金属矿产资源。但由于其地处边境,研究程度极为有限,本文对前人资料进行了整合,并结合野外实地地质考察对阿拉套山东段的侵入岩活动特征进行梳理,以期得到更为综合的认识。通过区域地质对比,突出强调了米尔其克断裂的重要意义。即以米尔其克断裂为界,分为东、西二段。二者在地层、构造、岩浆岩及成矿等方面均存在明显差别。其中,西段缺少火山岩,大面积出露S型花岗岩、成矿以钨、锡矿为主;东段火山岩发育,以I型及A型花岗岩为主,成矿与铁、铜、铅、锌、金矿较密切。依据相关测年资料得到,阿拉套山地区的岩浆活动主要经历了火山喷发——酸性岩类侵入——各种脉岩形成的完整岩浆旋回。区内侵入体的形成年龄集中于283-302Ma,主要为晚石炭世至早二叠世的产物。对区内的阿尔夏提矽卡岩型矿床进行了仔细研究,确定了其致矿侵入体是区内的闪长岩小岩体及岩墙,而非前人研究认为的推木尔特岩基,岩墙经历了广泛的流体作用,是含矿流体的通道。推木尔特岩基在成矿过程中起着含矿流体屏蔽层的作用,阻挡了后期上升的流体的逃逸,促使含矿流体在其下方析出有用金属,并富集成矿。其侵位主要引发了围岩的热接触变质作用,形成大理岩化及角岩化。通过典型矿床的研究,提出致矿侵入体的识别应当满足五种联系,即空间联系、时间联系、热力学联系、运动学联系和动力学联系,只有当五种联系都满足时,地质现象间才存在直接成因联系,在实际研究中,任何一种联系的破裂都表明两种现象之间缺乏直接成因联系,但仍可追索它们间的相互联系。基于此,致矿侵入体的识别还可从地质特征,岩石学特征,矿物学特征及地球化学特征等方面进行,可认为是五种联系的具体反映。
[Abstract]:Alatao Mountain is located near the border between Xinjiang and Kazakhstan in the north and west of China. The geological background and metallogenic geological conditions inside and outside Xinjiang are similar and a large number of metallic and non-metallic mineral resources have been formed. However, because it is located at the border, the research degree is very limited, so this paper integrates the previous data and combs the characteristics of intrusive rock activity in the Alatao Shandong section in combination with the field geological investigation, in order to get a more comprehensive understanding. Through regional geological correlation, the importance of Milchick fault is highlighted. That is to say, Milchick fault as the boundary, divided into the east and west of the second paragraph. There are obvious differences between them in stratigraphy, structure, magmatic rock and mineralization. There is a lack of volcanic rocks in the western part, large areas of S type granite, mainly tungsten and tin mineralization, and volcanic rocks developed in the eastern part, I type and A type granite, mineralization with iron, copper, lead, zinc and gold are close. According to the relevant dating data, magmatic activities in the Alataoshan area mainly experienced a complete magmatic cycle formed by volcanic eruption-acidite intrusions and various dikes. The formation age of the intrusions in this area is mainly from the late Carboniferous to the early Permian. The arschatite skarn type deposit in this area has been carefully studied, and it has been determined that the ore-causing intrusive body is the diorite small rock mass and the rock wall in the area, rather than the napolt rock base as considered by previous studies, the rock wall has experienced extensive fluid action. Is the passage of ore-bearing fluids. In the process of ore-forming, the Pumult base acts as a shielding layer of ore-bearing fluid, which prevents the runaway of the rising fluid in the later stage, and promotes the ore-bearing fluid to precipitate useful metals under the ore-forming process and to enrich the ore-forming. Its emplacement mainly caused the thermal contact metamorphism of surrounding rock and formed marble and hornstone. Through the study of typical ore deposits, it is proposed that the identification of ore-causing intrusions should satisfy five kinds of connections, namely, spatial, temporal, thermodynamic, kinematic and dynamic, and only when the five connections are satisfied. There is a direct genetic relationship between geological phenomena. In the actual study, the rupture of any kind of connection indicates that there is no direct genetic relation between the two phenomena, but the mutual relation between them can still be traced. Based on this, the identification of ore-causing intrusions can also be carried out from geological, petrological, mineralogical and geochemical characteristics, which can be considered as a concrete reflection of the five kinds of connections.
【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】：P588.12;P612

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