| The second phase of CE project is achieving soft landing on the moon, and theprimary location is Sinus Iridium which in LQ-4region of the moon. Based on theprevious researches, we give an analysis and explanation in detail in follow aspects ofLQ-4, circular structure, lineament, material and topography. Conclusion that:1．Ridge, rille, graben, crater chain, rupes, mountain, fracture and unknownlineament is formed by inner and outside stress. There is no valley in this region.According to the analysis of all of the lineaments, we summarized that (1) There is acorrelation between the distribution of the ridges and the shape of the mares. Thisphenomenon is caused by the fracture around the mare which took place at thebeginning of the mare formation.(2)The stress station of LQ-4which is reflected bythose lineaments demonstrated that this region belong to a compression mechanism,while the tension force is not obvious.2． On the basis of previous studies, the content of iron, titanium, clinopyroxeneand plagioclase of LQ-4regions is calculated. The results showed that the contents ofiron and titanium are positively related, the aboundance in mare is high and highlandis low. The abundances of clinopyroxene and plagioclase are inversely related.Clinopyroxene in mares is rich and highland is poor, while plagioclase has an inversedistrbution. And then based on false color composite image combining with the abovematter content of LQ-4, mare basalt is divided. Using the Craters Size DistrbutionFrequency method (CSDF) absolute geological ages of all those areas are calculated.Primarily concluded the basalt filling order: Sinus Iridium(3.39b.y.)-East of MareImbrium(3.21b.y.)-Crater Plato(2.86b.y.)–West of Mare Imbrium(2.64b.y.)–NortheastOceanus procellarum(2.10b.y.).3. In this paper, roughness firstly applied to the topography analysis of LQ-4region. And the usefulness of the Hurst exponent in the division of relative geologicalage is verified. Conclusions are as follows:(1) the Sinus Iridium slope does notexceed2°, the surface is flat which represent the roughness is low; ConsideringHurst exponent in horizontal and vertical direction is different in Sinus Iridium area, this area belongs to the anisotropic terrain, and that is influenced by the southeasternpart of this area; In research scale Hurst exponent increases from north to south, fromwest to east which means it is change from static terrain into dynamic terrain innorthwest to southeast inner Sinus Iridium, and roughness in this direction isincreased.(2) In the terrain comparison of Mare Imbrium, highlands, Sinus Iridiumand Oceanus procellarum, the roughness of highlands strongly greater than others,that is because the region is affected by asteroid impact and large impact event. Theroughness of Oceanus procellarum is slightly bigger than Mare Imbrium. That isbecause the degree of basalt filling process is different among different mares. Thoseresults show that roughness can provide terrain data support in explain the moontectonic evolution.(3) Through the contrast of Hurst exponent and optical maturity,Hurst exponent can determine stratigraphic age in smaller area, but can not apply inlarge area. |
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