地学前缘 ›› 2018, Vol. 25 ›› Issue (1): 297-313.DOI: 10.13745/j.esf.yx.2016-11-30

• 非主题来稿选登 • 上一篇    下一篇

月球雨海盆地多环结构的厘定及其深部构造研究

王庆龙,刘建忠,郭弟均,籍进柱,刘敬稳,王俊涛,罗林   

  1. 1. 吉林大学 地球科学学院, 吉林 长春 130061
    2. 中国科学院 地球化学研究所 月球与行星科学研究中心, 贵州 贵阳 550081
    3. 中国科学院大学, 北京 100049
  • 收稿日期:2016-05-13 修回日期:2016-11-20 出版日期:2018-01-15 发布日期:2018-01-15
  • 作者简介:王庆龙(1986—),男,博士研究生,矿物学、岩石学、矿床学专业,主要从事行星岩石与地球化学研究。E-mail:wqljldx_2009@163.com
  • 基金资助:
    国家自然科学基金重大项目(41490634,41490635);国家自然科学基金面上项目(41373068,41773065);国家科技基础性工作专项(2015FY210500);中国科学院先导专项项目(XDB1800000)

Determination of multiring structure and analysis on the deep structure of the Lunar Mare Imbrium Basin

WANG Qinglong,LIU Jianzhong,GUO Dijun,JI Jinzhu,LIU Jingwen,WANG Juntao,LUO Lin   

  1. 1. College of Earth Sciences, Jilin University, Changchun 130061, China
    2. Lunar and Planetary Science Research Center, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
    3. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2016-05-13 Revised:2016-11-20 Online:2018-01-15 Published:2018-01-15

摘要: 雨海盆地是月球正面最大、月球上研究程度最高的多环结构撞击盆地,已有很多学者对其多环结构的边界进行恢复研究,但在多环结构最初始形状、多环位置/数量、盆地大小等方面,至今未能达成共识。本文利用GRAIL自由空气重力异常数据、LOLA激光测高数据进行了多源数据的融合,结果表明,雨海盆地是具有偏心圆的三环结构特点,其直径从外到内分别为1 500 km、1 100 km、665 km。基于欧拉反演结果研究表明,在雨海撞击盆地中部存在两种不同深度、构造运动性质及方向的断裂构造,即:(1)深度大于40 km,向下逐渐向内倾斜、延伸的深部断裂构造;(2)深度在40 km以内,由月表向下逐渐向外倾斜、延伸的浅部断裂构造。结合物质成分及地球物理特征的研究,雨海地区的地质构造演化过程可分为两个阶段:(1)在月球早期阶段(45~38.5亿年),主要以内动力地质作用即岩浆洋冷凝过程为主,形成了雨海盆地深度在40 km以下逐渐向内倾斜、延伸的构造断裂,其为本区在月球早期深部岩浆洋产生、分异及运移提供了通道,该构造断裂代表了雨海盆地撞击前的月球早期深部岩浆洋的构造地质演化阶段;(2)在月球晚期阶段(≤38.5亿年),主要以内、外动力地质作用并重,形成了雨海盆地深度在40 km以内逐渐向外倾斜、延伸的构造断裂,其应为本区不同期次的玄武质岩浆喷出或溢流到月表提供了运移通道,该构造断裂代表了雨海盆地撞击后的月球晚期不同期次玄武质岩浆喷发、充填溢流的月海岩浆活动作用的构造地质演化阶段。

关键词: 月球, 雨海盆地, 多环结构, 深部构造, GRAIL重力数据

Abstract: The Imbrium Basin is the largest lunar near side and the most researched multiring impact basin on the Moon that a substantial amount of studies has been done on the boundary restoration of its multiring structure. But so far most scholars have not reached a consensus on the initial shape of the multiring structure and neither on the multiring position/quantity, basin size, etc. This paper used GRAIL Freeair gravity anomaly and LOLA laser altimetry data to carry out a multisource data integration analysis. The results show that the Imbrium Basin has a three ring structure with eccentric circles of boundary feature; the diameters of the three rings are 1500 km, 1100 km and 665 km, respectively from the outside to the inside. Based on the Euler inversion results, there are two fault structures at different depths pertinent to the tectonic movement properties and directions in the central Imbrium Basin. The two fault structures are named (1) the deep fault structure, which is gradually inclined and extends inwardly at the depth >40 km; and (2) the shallow fault structure, which is gradually inclined and extends outwardly at the depth ≤40 km. Studies on material composition combined with geophysical characteristics show that the geological tectonic evolution of the Imbrium area can be mainly divided into two stages. Stage 1: The gradually inclined and inwardly extended structure at the depth >40 km formed from the main evolution of the internal dynamic that is a magmatic condensation process in the early stage of the Moon(4.53.85 Ga); it provides a channel for the generation, differentiation and migration of deep magma in the early stage of the moon. This structure fault represents the tectonic evolution stage of the deep magma ocean of the Imbrium area before the Imbrium Basin impacted. Stage 2: The gradually inclined and outwardly extended structure at the depth ≤40 km formed from two kinds of equally significant geological dynamic evolutions of internal and external dynamic of lunar geological processes in the late stage of the Moon(≤3.85 Ga), it provides a migration path for the different stages of the basaltic magma eruption or overflow to the lunar surface. This structure fault represents the tectonic evolution stage of the mare magmatism of different stages of basaltic magma eruption,filling overflow of the Imbrium area in the late stage of the moon after the Imbrium Basin impacted.

Key words: Moon, Imbrium Basin, multiring structure, deep structure, GRAIL gravity data

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