月表LQ-4地区遥感地质信息提取和分析

发布时间：2018-05-03 14:20

本文选题：LQ-4地区 + 线性构造　；参考：《中国地质大学(北京)》2012年硕士论文

【摘要】：嫦娥二期工程将实现月球软着陆，预选登陆点为月表正面的虹湾地区，其所在的LQ-4地区成了目前研究的重点。本文在前人研究的基础上，从环形构造、线性构造、物质岩性以及地貌特征几个方面，对该地区进行详分析和解译，认为： 1、LQ-4地区在内外应力的作用下，形成月岭、月溪、地堑、坑链、陡坡、山脉、断裂和其他类型的线性构造，而缺少月谷。在对该地区所有线性构造解译，分析得出以下结论：（1）初步认为月岭分布与月海盆地的整体形态呈现相关性，并且是受盆地形成初期盆地周围产生的断层的影响。（2）通过对线性构造的整体分析认为LQ-4地区长期处在较强的挤压体制之下，而所受区域性张力并不明显。 2、本文在前人研究的基础上，反演得到LQ-4地区的铁、钛、斜辉石、斜长石的含量，结果显示LQ-4地区铁和钛的含量呈正相关关系，月海含量高、月陆含量低；斜辉石和斜长石呈负相关关系，斜辉石主要分布在月海地区，而月陆地区分布较少，斜长石则相反。又依据月表假彩色合成影像并结合以上物质含量数据对LQ-4地区月海玄武岩进行划分，并利用撞击坑密度法（CSDF）计算各自的绝对地质年龄，初步确定该地区玄武岩填充顺序为：虹湾（3.39Ga）-雨海东部（3.21Ga）-柏拉图坑（2.86Ga）-雨海西部（2.64Ga）-风暴洋东北部（2.10Ga）。 3、本文首次将粗糙度的概念运用到LQ-4地区的地貌形态的分析中，并验证了其在划分相对地质年代的作用。结论如下：（1）虹湾地区坡度不超过2°，地形平缓，代表整体粗糙度不大；又由于虹湾地区Hurst指数在水平和垂直方向上的差异，认为该地区属于各向异性地形（anisotropic），并认为是由虹湾东南部的地形所致；在研究尺度内Hurst指数自北往南增大、自西往东增大，表示在虹湾地区自西北向东南方向，由静态地形转变为动态地形，表明粗糙度在此方向上逐渐增大。（2）在雨海，高地，风暴洋和虹湾地区的地形比较中，高地和其他三个区域的地形相比，，粗糙度明显较大，是该地区受小行星撞击和大型撞击作用的结果；风暴洋粗糙度略大于雨海，是由于在玄武岩自各月海填充过程中，其填充程度不同，致使在后期改造过程中形成不同的地貌形态，以上结果表明，粗糙度在解释月球构造演化上能够提供地形数据的支持。（3）通过Hurst指数和光学成熟度的对比，认为Hurst指数适合于小区域内地层相对年代的确定。
[Abstract]:The lunar soft landing will be realized in the second phase of the Chang'e project. The pre-selected landing point is the Hongwan area on the front of the moon. The LQ-4 area where the landing site is located has become the focus of current research. On the basis of previous studies, this paper makes a detailed analysis and interpretation of the region from the following aspects: ring structure, linear structure, material lithology and geomorphology. Under the action of internal and external stresses, Yueling, Yuexi, graben, crater chain, steep slope, mountain range, fault and other types of linear structures are formed in LQ-4 area, but lack of lunar valley. In the interpretation of all linear structures in this area, the following conclusions are drawn: 1) it is concluded that the distribution of the lunar ridge is correlated with the overall shape of the Yuehai basin. And it is influenced by the faults around the basin in the early stage of the basin formation. (2) based on the overall analysis of the linear structures, it is concluded that the LQ-4 area is under a strong compression system for a long time, but the regional tension is not obvious. 2. Based on the previous studies, the contents of iron, titanium, clinopyroxene and plagioclase in LQ-4 area are obtained by inversion. The results show that there is a positive correlation between iron and titanium content in LQ-4 area, the content of lunar sea is high, and the content of lunar land is low. There is a negative correlation between clinopyroxene and plagioclase. The clinopyroxene is mainly distributed in the lunar sea area, while the continental area is less, and the plagioclase is the opposite. Based on the pseudocolor synthetic image of the moon surface and the above material content data, the basalt in the LQ-4 area is divided, and their absolute geological ages are calculated by means of the impact pit density method. The order of basalt filling in this area is as follows: Hongwan 3.39GaGa-Rain Sea 3.21Ga-Plato Pit 2.86Ga-Rain Sea Western China 2.64GaGa-2.10GaN in the northeast of stormy ocean. In this paper, the concept of roughness is applied to the analysis of geomorphology in LQ-4 area for the first time, and its role in the classification of relative geological ages is verified. The conclusion is as follows: (1) the slope of Rainbow Bay area is not more than 2 掳, the topography is gentle, and the overall roughness is not large, and the difference of Hurst index in horizontal and vertical direction in Rainbow Bay area, It is considered that this area belongs to anisotropic topography and is caused by the topography of southeast Honghong Bay, and the Hurst exponent increases from north to south and from west to east in the scale of study, which means that the area in Hongwan is from northwest to southeast. The change from static terrain to dynamic terrain indicates that the roughness increases gradually in this direction.) in the comparison of the topography of rain sea, highland, storm ocean and Rainbow Bay, the roughness of the highland is obviously larger than that of the other three regions. The roughness of the storm ocean is slightly greater than that of the rain sea because the basalt has been filled with different degrees during each month's sea filling. These results show that roughness can provide support for topographic data in explaining the evolution of lunar tectonics by comparing the Hurst index with the optical maturity. It is considered that the Hurst exponent is suitable for determining the relative age of strata in a small area.
【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】：2012
【分类号】：TP79;P184.5

【引证文献】