月球雨海地区的地质演化

发布时间：2018-03-26 09:06

  本文选题：月球　切入点：雨海　出处：《吉林大学》2016年博士论文

【摘要】：本文以月球雨海地区为研究对象,采用月球物质成分、地形地貌及重力场等多源遥感探测数据融合的方式,对其地质演化过程展开了综合分析与研究。针对目前雨海盆地多环结构初始边界存在的广泛争议,利用LOLA形貌、山体阴影及GRAIL自由空气重力场等遥感数据进行了研究,结果表明雨海盆地是具有偏心圆的三环结构特征,三环结构的直径从外向内分别为1500km、1100km、665km。利用嫦娥一号IIM光谱数据融合LP伽马射线谱仪Th元素成分数据,再结合前人对本区月岩研究成果将雨海岩石一共划分为11类,其中非月海岩石划分为高地岩石和非月海玄武岩两大类。高地岩石划分为4类,分别为亚铁斜长岩、富镁结晶岩套、富Mg尖晶石斜长岩及KREEP岩。非月海玄武岩划分为2类,分别为高铝(AL)玄武岩及克里普玄武岩。月海岩石划分为5类,分别为极低钛、低钛、中钛、高钛及极高钛玄武岩。通过利用CE-2号影像数据、Clementine UVVIS多光谱数据结合撞击坑尺寸-频率定年法将本区划分了61个玄武岩地质单元,其表面年龄范围集中在2.21Ga~3.76Ga,结合玄武岩成分与年代学特征将本区玄武质岩浆活动划分为四个充填期次,并利用了2015年最新的月球撞击坑数据库初步厘定了雨海地区撞击事件时间演化序列;基于欧拉反演结果发现本区中部月表以下存在两种不同深度、构造运动性质及成因机制与演化过程的深部断裂构造即,(1)深度在40km以下逐渐向内倾斜、延伸的构造断裂。(2)深度在40km以内逐渐向外倾斜、延伸的压性逆冲构造断裂,这两种不同深度的深部构造断裂应代表了本区不同的构造地质演化过程;基于断裂构造在布格重力异常横向平面图上的传统识别标志结合解析信号的欧拉反演结果,共识别及划分出本区30条构造断裂,其成因机制可能与雨海大型撞击事件作用密切相关。雨海地区的地质演化过程主要可划分为以下三个阶段:(1)以内动力地质作用演化为主的月球早期深部岩浆洋的产生、分异及演化的前雨海大型岩浆事件作用阶段,其时间跨度为3.85Ga~4.6Ga;(2)以月球内、外动力地质作用演化并重的雨海盆地撞击作用地质事件及月海玄武质岩浆喷发、充填溢流的月海岩浆作用的演化阶段,其时间跨度为2.21Ga~3.85Ga;(3)以月球外动力地质作用演化为主的后雨海小型撞击作用事件演化阶段,其时间跨度为0~2.21Ga。雨海地区是在月球不同地质年代岩浆及撞击作用地质事件共同作用下所形成的产物,这对揭示整个月球的起源与地质演化过程提供了重要的参考。
[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.
【学位授予单位】：吉林大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：P184
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本文编号：1667237