本文選題：月球　切入點：雨海　出處：《吉林大學》2016年博士論文

【摘要】：本文以月球雨海地區(qū)為研究對象,采用月球物質成分、地形地貌及重力場等多源遙感探測數據融合的方式,對其地質演化過程展開了綜合分析與研究。針對目前雨海盆地多環(huán)結構初始邊界存在的廣泛爭議,利用LOLA形貌、山體陰影及GRAIL自由空氣重力場等遙感數據進行了研究,結果表明雨海盆地是具有偏心圓的三環(huán)結構特征,三環(huán)結構的直徑從外向內分別為1500km、1100km、665km。利用嫦娥一號IIM光譜數據融合LP伽馬射線譜儀Th元素成分數據,再結合前人對本區(qū)月巖研究成果將雨海巖石一共劃分為11類,其中非月海巖石劃分為高地巖石和非月海玄武巖兩大類。高地巖石劃分為4類,分別為亞鐵斜長巖、富鎂結晶巖套、富Mg尖晶石斜長巖及KREEP巖。非月海玄武巖劃分為2類,分別為高鋁(AL)玄武巖及克里普玄武巖。月海巖石劃分為5類,分別為極低鈦、低鈦、中鈦、高鈦及極高鈦玄武巖。通過利用CE-2號影像數據、Clementine UVVIS多光譜數據結合撞擊坑尺寸-頻率定年法將本區(qū)劃分了61個玄武巖地質單元,其表面年齡范圍集中在2.21Ga~3.76Ga,結合玄武巖成分與年代學特征將本區(qū)玄武質巖漿活動劃分為四個充填期次,并利用了2015年最新的月球撞擊坑數據庫初步厘定了雨海地區(qū)撞擊事件時間演化序列;基于歐拉反演結果發(fā)現本區(qū)中部月表以下存在兩種不同深度、構造運動性質及成因機制與演化過程的深部斷裂構造即,(1)深度在40km以下逐漸向內傾斜、延伸的構造斷裂。(2)深度在40km以內逐漸向外傾斜、延伸的壓性逆沖構造斷裂,這兩種不同深度的深部構造斷裂應代表了本區(qū)不同的構造地質演化過程;基于斷裂構造在布格重力異常橫向平面圖上的傳統(tǒng)識別標志結合解析信號的歐拉反演結果,共識別及劃分出本區(qū)30條構造斷裂,其成因機制可能與雨海大型撞擊事件作用密切相關。雨海地區(qū)的地質演化過程主要可劃分為以下三個階段:(1)以內動力地質作用演化為主的月球早期深部巖漿洋的產生、分異及演化的前雨海大型巖漿事件作用階段,其時間跨度為3.85Ga~4.6Ga;(2)以月球內、外動力地質作用演化并重的雨海盆地撞擊作用地質事件及月海玄武質巖漿噴發(fā)、充填溢流的月海巖漿作用的演化階段,其時間跨度為2.21Ga~3.85Ga;(3)以月球外動力地質作用演化為主的后雨海小型撞擊作用事件演化階段,其時間跨度為0~2.21Ga。雨海地區(qū)是在月球不同地質年代巖漿及撞擊作用地質事件共同作用下所形成的產物,這對揭示整個月球的起源與地質演化過程提供了重要的參考。
[Abstract]:This paper takes the rain sea area of the moon as the research object, adopts the multi-source remote sensing data fusion method such as lunar material composition, topography and geomorphology, gravity field, etc. The geological evolution process is comprehensively analyzed and studied. In view of the extensive disputes existing in the initial boundary of the multi-ring structure in the Yuhai Basin, the remote sensing data such as LOLA morphology, mountain shadow and GRAIL free air gravity field are used to study the remote sensing data, such as the shape of the LOLA, the shadow of the mountain body and the GRAIL free air gravity field. The results show that the Yuhai basin is a three-ring structure with eccentric circle. The diameter of the three-ring structure is 1 500 km / m from outside to inside respectively. The data of Th element composition of LP gamma-ray spectrometer are fused with Chang 'e-1 IIM data. In combination with the previous studies of lunar rocks in this area, the Yuhai rocks are divided into 11 types, in which the non-lunar rocks are divided into highland rocks and non-lunar basalts, and the highland rocks are divided into 4 types, respectively, which are ferrous plagioclase. Mg-rich crystalline rock suite, Mg-rich spinel syenite and KREEP rock. Non-moon-sea basalts are divided into two types, which are high-aluminum-rich basalts and Krippe basalts. Yuehai rocks are divided into 5 types, which are very low titanium, low titanium and medium titanium. High titanium and very high titanium basalt. 61 basalt geological units were divided into 61 basalt geological units by using CE-2 image data, Clementine UVVIS multispectral data and impact crater size frequency dating method. The surface age range of Black Tortoise magma is 2.21Ga / 3.76Ga. The magmatic activity of Black Tortoise in this area can be divided into four filling periods combined with basalt composition and geochronology. Using the latest lunar crater database in 2015, the time series of impact events in Yuhai area are preliminarily determined, and based on the Euler inversion results, it is found that there are two different depths below the lunar table in the central part of the area. The deep fault structure of tectonic movement and its genetic mechanism and evolution process is gradually inclined inward below 40km, and the extensional tectonic fault gradually tilts outwards within 40km, and the extensional compressive thrust tectonic fault extends in the depth of the tectonic movement and the evolution process, I. e., the depth of the deep fault is gradually inclined inward below 40km, and the extended depth of the tectonic fault is gradually tilting outward within 40km. These two deep structural faults of different depths should represent different tectonic geological evolution processes in this area, and based on the traditional identification marks of fault structures on the horizontal plane of Bouguer gravity anomalies combined with the Euler inversion results of analytical signals, A total of 30 tectonic faults were identified and divided in this area. Its genetic mechanism may be closely related to the large-scale impact events in the rain sea. The geological evolution process in the Yuhai area can be divided into the following three stages: 1) the generation of the deep magmatic oceans in the early lunar period, which is dominated by the evolution of internal dynamic geological processes. The time span of the major magmatic event stage of the differentiation and evolution of the Qianyuhai is 3.85GaS4.6Gaan2) the geological events of the rain basin collision and the Black Tortoise magma eruption of the lunar sea, which are the same as the evolution of the external dynamic geological processes in the lunar interior, are studied in this paper. The evolution stage of the lunar sea magmatism filled with overflow has a time span of 2.21 Ga ~ (3) 3 ~ (85) Ga ~ (3))) the evolution stage of the small impact events in the afterrain sea, which is dominated by the evolution of the dynamic geological processes outside the moon. The Yuhai area is formed under the combined action of magma and impingement geological events in different geological ages of the moon, which provides an important reference for revealing the origin and geological evolution of the whole moon.
【學位授予單位】：吉林大學
【學位級別】：博士
【學位授予年份】：2016
【分類號】：P184
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本文編號：1667237