粗糙度在月海玄武岩地层年龄研究中的作用探讨

发布时间：2018-05-03 10:01

本文选题：地质年龄 + 岩石单元划分　；参考：《中国地质大学(北京)》2015年硕士论文

【摘要】：本文通过对月表所获取多元月球轨道探测物质成分信息,并结合最新月球探测遥感影像资料LOLADEM进行分析和处理的基础之上,分析了地形参数粗糙度和月海玄武岩单元划分与定年之间的关系。结合月表主要地化元素的丰度分布特征和现下月表岩石定年研究比较成熟的撞击坑频率-尺寸定年技术方法,探索研究了粗糙度在反映月海玄武岩相对地层年龄时的作用。主要研究内容如下:1、月球岩石划分的原理与依据为,在Fe-Th元素二维散点图上,所有的月球样品可组成一个三角形的投影区,三个角分别代表KREEP岩、斜长岩、玄武岩。确定划分标准后,可将整个月表划分为三大岩石类型。三大岩石类型宏观上看,影像亮度有明显差异,从玄武岩、KREEP、斜长岩,亮度递增,此基础上,进一步划分玄武岩。玄武岩单元划分建立在TiO2、FeO等信息提取的基础上,进行假彩色合成图的人机交互划分。依据为,不同期次形成的玄武岩,其物质成分往往有较大的差异,表现在假彩色合成图上就是颜色差异明显。2、撞击作用是行星形成和表面重塑的重要地质过程,记录其演化的历史。撞击作用形成的环形构造可用于研究月球表面地质单元形成的时间。撞击坑频率-尺寸方法是现下利用遥感技术所获取月表地质年龄结果与月表返回样品的同位素测年结果较吻合的一种统计方法,本文利用该法对划分的玄武岩单元区域计算了绝对地质年龄。3、粗糙度是地表在一定范围内高低起伏的程度,是一种重要的地形参数。从所制作的月表粗糙度参数图来看,月表粗糙度基本呈现二分性特点,即月海粗糙度较低,而月陆高地粗糙度较高。本文对所划分的月海玄武岩区域的粗糙度信息做了统计分析,对照撞击坑频率-尺寸方法所获取的绝对地质年龄,探讨了二者之间的数学关系,以及粗糙度在表征月海盆地地层单元相对地质年龄中的意义和作用。
[Abstract]:In this paper, based on the analysis and processing of the multivariate lunar orbital material components obtained from the lunar table and the latest lunar remote sensing image data LOLADEM, The relationship between the roughness of topographic parameters and the division and dating of basalt units in the Moon Sea is analyzed. Based on the abundance distribution characteristics of the main geochemistry elements on the lunar surface and the relatively mature technique of crater frequency-size dating for the current lunar surface rock dating, the role of roughness in reflecting the relative stratigraphic age of lunar basalt is studied. The main research contents are as follows: 1. The principle and basis of lunar rock division are as follows: on Fe-Th element two-dimensional scatter plot, all lunar samples can form a triangular projection area, and three angles represent KREEP rock, plagioclase and basalt respectively. The whole monthly table can be divided into three rock types after determining the classification criteria. From the macroscopic view of the three major rock types, there are obvious differences in image luminance. On the basis of this, basalt is further divided into basalts from KREEPs, plagioclase and increasing brightness. Basalt unit division is based on the extraction of information such as TIO _ 2 and Feo, and the human-computer interaction partition of pseudocolor composite map is carried out. On the basis of this, the material composition of basalts formed at different times is often quite different, which is shown in the pseudocolor composite diagram. The color difference is obvious. The collision is an important geological process of planetary formation and surface remodeling. Record the history of its evolution. The annular structure formed by impact action can be used to study the time of formation of geological units on the lunar surface. The frequency-size method of impact crater is a statistical method, which is used to obtain the lunar surface geological age data by remote sensing technology and the isotopic dating results of the monthly surface return samples. In this paper, the absolute geological age of the basalt unit area is calculated by using this method. The roughness is the degree of the surface fluctuation in a certain range and is an important topographic parameter. According to the monthly surface roughness parameter diagram, the roughness of the monthly surface is dichotomous, that is, the roughness of the lunar sea is lower, and the roughness of the lunar plateau is higher. In this paper, the roughness information of the basalt area in the lunar sea is statistically analyzed, and the mathematical relationship between the two is discussed in comparison with the absolute geological age obtained by the frequency-size method of impact crater. And the significance and role of roughness in characterizing the relative geological age of stratigraphic units in the Yuehai Basin.
【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】：P588.145

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