摘要
通过CCD图像对Plato坑周围区域的线性地貌进行解译和构造方位统计,发现2组明显的线性构造优选方向,一组为NNE—SSW向,一组NWW—SEE向。分析后认为,这是在早期区域应力场作用下形成的,之后受到雨海事件和Plato事件的影响发生再活动,但是区域总体构造格架基本保持不变。使用IIM光谱研究发现,溅射物造成了Plato坑西部和东部在光谱上的差异。坑底玄武岩相对月海玄武岩基性物质含量要低,结合DEM分析认为坑底玄武岩并非从单点溢出。通过对Plato坑壁因垮塌而出露基岩的光谱研究和对本区域平底型月坑宽深比的统计,认为本区域属于高地与月海过渡的地区,在物质成分上受到雨海堆积物的影响而含有较多的低反射率基性物质。最后尝试性地对该地区的地质演化过程进行了推演,得出对本地区地质演化的粗略认识。
After the statistical analysis of lineament structure from CE1-CCD images in this region,two preferential tectonic orientations,NNE-SSW and NWW-SEE,are revealed.This paper proposed that those ruptures were caused by the regional tectonic stress before Imbrium event,and became activated under the influence of Imbrium event and Plato impact,but still kept a stable tectonic sets.The west part of Plato is covered by bright ray material and which causes the difference of reflectance spectrum between west part and east part of Plato.The floor of Plato was filled by dark material.Probably basaltic magmas overflowed from non-single spots based on DEM,and less basic material is contained in that compared with mare basalt implied by the CCD-IIM spectral data.Directed by the reflectance spectrum of Plato＇s wall material and the statistical results of diameter/depth ratios of some craters with flat floor,this paper proposed that this area is a transitional region between plateau and mare,and covered by the material excavated from moon＇s lower crust.Based on the integration of conclusions drawn from the analysis of CCD,LAM and IIM,a roadmap of regional evolution is proposed eventually.
出处
《地质通报》
CAS
CSCD
北大核心
2011年第5期737-749,共13页
Geological Bulletin of China
基金
国家高科技研究发展计划(863计划)<地球观测与导航技术领域"绕月探测工程科学数据应用与研究">重点项目子课题一<月球数字地质图编制与月球演化模型综合研究>(编号:2009AA122201)
