本文選題：LQ-4地區(qū) + 線性構(gòu)造��； 參考：《中國地質(zhì)大學(xué)(北京)》2012年碩士論文

【摘要】：嫦娥二期工程將實現(xiàn)月球軟著陸，預(yù)選登陸點為月表正面的虹灣地區(qū)，其所在的LQ-4地區(qū)成了目前研究的重點。本文在前人研究的基礎(chǔ)上，從環(huán)形構(gòu)造、線性構(gòu)造、物質(zhì)巖性以及地貌特征幾個方面，對該地區(qū)進行詳分析和解譯，認為： 1、LQ-4地區(qū)在內(nèi)外應(yīng)力的作用下，形成月嶺、月溪、地塹、坑鏈、陡坡、山脈、斷裂和其他類型的線性構(gòu)造，而缺少月谷。在對該地區(qū)所有線性構(gòu)造解譯，分析得出以下結(jié)論：（1）初步認為月嶺分布與月海盆地的整體形態(tài)呈現(xiàn)相關(guān)性，并且是受盆地形成初期盆地周圍產(chǎn)生的斷層的影響。（2）通過對線性構(gòu)造的整體分析認為LQ-4地區(qū)長期處在較強的擠壓體制之下，而所受區(qū)域性張力并不明顯。 2、本文在前人研究的基礎(chǔ)上，反演得到LQ-4地區(qū)的鐵、鈦、斜輝石、斜長石的含量，結(jié)果顯示LQ-4地區(qū)鐵和鈦的含量呈正相關(guān)關(guān)系，月海含量高、月陸含量低；斜輝石和斜長石呈負相關(guān)關(guān)系，斜輝石主要分布在月海地區(qū)，而月陸地區(qū)分布較少，斜長石則相反。又依據(jù)月表假彩色合成影像并結(jié)合以上物質(zhì)含量數(shù)據(jù)對LQ-4地區(qū)月海玄武巖進行劃分，并利用撞擊坑密度法（CSDF）計算各自的絕對地質(zhì)年齡，初步確定該地區(qū)玄武巖填充順序為：虹灣（3.39Ga）-雨海東部（3.21Ga）-柏拉圖坑（2.86Ga）-雨海西部（2.64Ga）-風(fēng)暴洋東北部（2.10Ga）。 3、本文首次將粗糙度的概念運用到LQ-4地區(qū)的地貌形態(tài)的分析中，并驗證了其在劃分相對地質(zhì)年代的作用。結(jié)論如下：（1）虹灣地區(qū)坡度不超過2°，地形平緩，代表整體粗糙度不大；又由于虹灣地區(qū)Hurst指數(shù)在水平和垂直方向上的差異，認為該地區(qū)屬于各向異性地形（anisotropic），并認為是由虹灣東南部的地形所致；在研究尺度內(nèi)Hurst指數(shù)自北往南增大、自西往東增大，表示在虹灣地區(qū)自西北向東南方向，由靜態(tài)地形轉(zhuǎn)變?yōu)閯討B(tài)地形，表明粗糙度在此方向上逐漸增大。（2）在雨海，高地，風(fēng)暴洋和虹灣地區(qū)的地形比較中，高地和其他三個區(qū)域的地形相比，，粗糙度明顯較大，是該地區(qū)受小行星撞擊和大型撞擊作用的結(jié)果；風(fēng)暴洋粗糙度略大于雨海，是由于在玄武巖自各月海填充過程中，其填充程度不同，致使在后期改造過程中形成不同的地貌形態(tài)，以上結(jié)果表明，粗糙度在解釋月球構(gòu)造演化上能夠提供地形數(shù)據(jù)的支持。（3）通過Hurst指數(shù)和光學(xué)成熟度的對比，認為Hurst指數(shù)適合于小區(qū)域內(nèi)地層相對年代的確定。
[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 擄, 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.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TP79;P184.5

【引證文獻】

相關(guān)期刊論文 前1條

1 李珂;陳建平;奚曉旭;許延波;王春女;;基于撞擊坑自動識別的月球雨海北部地區(qū)(LQ-4)月海玄武巖定年研究[J];地學(xué)前緣;2012年06期

本文編號：1838850