本文關鍵詞： 月嶺 葉狀陡坎 砂箱構(gòu)造物理模擬 構(gòu)造變形過程　出處：《地學前緣》2012年06期 　論文類型：期刊論文

【摘要】：月嶺是月球表面月海中分布最廣的一種線性構(gòu)造。雖然月嶺的形貌特點已被廣泛認識,但它的演化機制與過程卻一直存在爭論。月球目前所處的地質(zhì)歷史時期哥白尼紀形成的另一種線性構(gòu)造葉狀陡坎已被發(fā)現(xiàn),改變了之前人類普遍認為月球自31億年以來再無構(gòu)造活動的認識,但月嶺發(fā)育的時代特征還未確定,因此,對月嶺成因過程和形成時代的研究是認識月球表面構(gòu)造形成機制和月球演化過程的關鍵。基于美國勘測軌道飛行器(LRO)數(shù)據(jù),對雨海地區(qū)的月嶺構(gòu)造進行解譯;利用小型撞擊坑直徑與形貌相對關系定年法結(jié)合月嶺與小型撞擊坑的交切關系,證明在哥白尼紀月球表面仍然有月嶺發(fā)育,進一步證實月球表面仍然有構(gòu)造運動發(fā)生。利用哥白尼紀葉狀陡坎的成因機制,文中設計了基底收縮作用下的月嶺砂箱構(gòu)造物理模擬實驗,并設置不同參數(shù)多次反復模擬,將模擬結(jié)果的頂面和剖面形態(tài)以及構(gòu)造樣式與實際月嶺進行了對比分析。模擬結(jié)果與實際月嶺各項特征基本吻合,得出基底收縮可以作為哥白尼紀月嶺的形成機制;此外,通過實驗發(fā)現(xiàn)在這一機制下月嶺是由先形成的葉狀陡坎構(gòu)造發(fā)展而來,并在月嶺發(fā)育后又有新的葉狀陡坎形成。通過實驗過程的監(jiān)測以及對實驗數(shù)據(jù)的測算,發(fā)現(xiàn)月嶺的演化過程經(jīng)歷塑性變形期、葉狀陡坎發(fā)育期、月嶺形成期和月嶺成形后的葉狀陡坎再發(fā)育期4個時期;月嶺與葉狀陡坎并不是受物質(zhì)與環(huán)境約束完全獨立發(fā)育的兩類線性構(gòu)造,在哥白尼紀以收縮為動力來源的應力環(huán)境下可以互相轉(zhuǎn)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.
【作者單位】： 中國地質(zhì)大學(北京)地球科學與資源學院;湖南省地質(zhì)博物館;中國地質(zhì)大學地質(zhì)過程與礦產(chǎn)資源國家重點實驗室;山東黃金地質(zhì)礦產(chǎn)勘查有限公司;
【基金】：國家高技術(shù)研究發(fā)展計劃“863”項目(2009AA122201)
【分類號】：P184.5

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