雨海哥白尼纪月岭的构造样式与演化过程研究

发布时间：2018-02-25 01:34

本文关键词： 月岭叶状陡坎砂箱构造物理模拟构造变形过程　出处：《地学前缘》2012年06期 　论文类型：期刊论文

【摘要】：月岭是月球表面月海中分布最广的一种线性构造。虽然月岭的形貌特点已被广泛认识,但它的演化机制与过程却一直存在争论。月球目前所处的地质历史时期哥白尼纪形成的另一种线性构造叶状陡坎已被发现,改变了之前人类普遍认为月球自31亿年以来再无构造活动的认识,但月岭发育的时代特征还未确定,因此,对月岭成因过程和形成时代的研究是认识月球表面构造形成机制和月球演化过程的关键。基于美国勘测轨道飞行器(LRO)数据,对雨海地区的月岭构造进行解译;利用小型撞击坑直径与形貌相对关系定年法结合月岭与小型撞击坑的交切关系,证明在哥白尼纪月球表面仍然有月岭发育,进一步证实月球表面仍然有构造运动发生。利用哥白尼纪叶状陡坎的成因机制,文中设计了基底收缩作用下的月岭砂箱构造物理模拟实验,并设置不同参数多次反复模拟,将模拟结果的顶面和剖面形态以及构造样式与实际月岭进行了对比分析。模拟结果与实际月岭各项特征基本吻合,得出基底收缩可以作为哥白尼纪月岭的形成机制;此外,通过实验发现在这一机制下月岭是由先形成的叶状陡坎构造发展而来,并在月岭发育后又有新的叶状陡坎形成。通过实验过程的监测以及对实验数据的测算,发现月岭的演化过程经历塑性变形期、叶状陡坎发育期、月岭形成期和月岭成形后的叶状陡坎再发育期4个时期;月岭与叶状陡坎并不是受物质与环境约束完全独立发育的两类线性构造,在哥白尼纪以收缩为动力来源的应力环境下可以互相转化。
[Abstract]:The lunar ridge is one of the most widely distributed linear structures in the lunar sea on the lunar surface, although the features of the lunar ridge have been widely recognized. However, the mechanism and process of its evolution have always been debated. Another linear tectonic leaf-like steep ridge formed during the Copernican period in the geological history of the Moon has been discovered. It changed the general belief that the moon had no tectonic activity since 3.1 billion years ago, but the age characteristics of lunar ridge development have not been determined, so, The study of the formation process and age of the lunar ridge is the key to understand the mechanism of the formation of the lunar surface structure and the evolution process of the moon. Based on the data of the American Orbiter Orbiter (ROV), the Yueling structure in the Yuhai area is interpreted. By using the relative relationship between the diameter and morphology of the small crater and the intersecting relationship between the lunar ridge and the small impact crater, it is proved that the lunar ridge still developed on the Copernican lunar surface. It is further confirmed that tectonic movement still occurs on the surface of the moon. Based on the mechanism of Copernican leaf steep ridges, a physical simulation experiment of lunar ridge sand box structure under the action of basement contraction is designed, and different parameters are set up for repeated simulation. The top surface and section shape of the simulation results and the structural style are compared with the actual lunar ridge. The simulation results are basically consistent with the actual lunar ridge characteristics. It is concluded that the basement contraction can be used as the formation mechanism of the Copernican Jiyue Ridge. It is found through experiments that in this mechanism the next month ridge is developed from the first formed leaf steep ridge structure, and a new leaf steep ridge is formed after the lunar ridge develops. Through the monitoring of the experimental process and the measurement of the experimental data, It was found that the evolution of Yueling experienced four stages: plastic deformation stage, leaf steep ridge development stage, lunar ridge formation stage and leaf steep ridge redevelopment stage. Lunar ridge and leaf ridge are not two kinds of linear structures which are completely independent of physical and environmental constraints. They can transform each other under the Copernican stress environment in which shrinkage is the dynamic source.
【作者单位】：中国地质大学(北京)地球科学与资源学院;湖南省地质博物馆;中国地质大学地质过程与矿产资源国家重点实验室;山东黄金地质矿产勘查有限公司;
【基金】：国家高技术研究发展计划“863”项目(2009AA122201)
【分类号】：P184.5

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