利用多道信号测定短周期面波频散

使用适配滤波频时分析技术处理面波信号,获取滤波后的时域包络,并对具有相同群速度的各道信号包络的振幅进行叠加,取叠加所得极大值对应的走时为该频率的群延时,以此来提高群速度的测量精度对P-τ,（相慢度-时间）域的波场进行傅氏变换,然后在P-ω（相慢度-频率）平面叠加多道信号来测定相速度．利用这两种方法处理合成的短周期瑞利波地震图,结果表明：经过振型分离以后,利用基阶振型信号所求出的相速度、群速度曲线更加接近理论频散值．对地震勘探资料进行处理,取得了5-40Hz内的相速度、群速度频散,且曲线较为平滑     

辽河群变质泥质岩中变质重结晶作用和变形作用的关系

辽河群变泥质岩中变斑晶种类繁多,有的具多个世代。同位素年代学证据表明它们都形成于吕梁变质期。通过２０００多块薄片的详细显微构造分析,将吕梁变质期分成四个变质阶段。变斑晶微构造揭示Ｍ１发生于变形前埋藏过程中,Ｍ２、Ｍ３属进变质阶段,Ｍ４为退变阶段。变斑晶在各变质阶段以完整或不完整的基本结晶序列周期性地出现,成核具阶段性,生长既有阶段性的又有具连续性的。变斑晶在不同的变形条件下,具有不同的变形行为,如旋转与非旋转性。变斑晶的时空分布规律揭示,Ｍ２期间垂向递增变质带与Ｄ１伸展构造样式密切相关;Ｍ３期间侧向递增变质带样式与收缩挤压褶皱样式一致。     

兰州-民和盆地红古城组的建立及其地质学意义

兰州—民和盆地下白垩统地层,出露良好,厚度较大,自下而上可建立８个非正式的岩石地层单位（岩组）。红古城组位于下白垩统上部的第七岩组。该组以剖面连续、出露甚好、顶底清楚、厚度不大而与上、下地层显著不同,具独特的岩性、岩相特征。虽然岩性、岩相在横向上变化较快,但顶、底界线都具良好的标志层,在盆地内可以广泛追索和对比。该组岩石地层单位的正式建立,不仅便于区内地层的划分与对比,而且对盆内层序地层、岩相分析、构造演化的研究都具重要意义。     

山东省前寒武纪几个基础地质问题

根据１∶５万区调及科研所取得的新资料、新成果,论述了山东前寒武纪几个基础地质问题：关于山东大地构造划分问题;山东早元古宙粉子山群与荆山群的关系;山东前寒武纪侵入岩的填图方法。     

REE Geochemistry of Some Metamorphic Rock Types of the Late Archean Fuping Group and Their Anatectic Derivatives in Pingshan,Hebei Province,China—A Preliminary Study

The Late Archean Fuping Group of the Xiaojiao area in Pingshan Couty,Hebei Province consists mainly of three metamorphic rock types of supracrustal affinity,i.e.,Kfeldspar leucoleptite,biotite leptite-gneiss and hornblendic rocks.Their anatectic derivatives formed in the initial stage of anatexis are petrochemically of K-feldspar granitic trondhjemitic and granodioritic compositions respectively,and in general have inherted the main petrochemical featurews from their parent rock types,Probably due to the fact that they contain less REE rich accessory minerals as compared with their parent rocks,the anatectic derivatives are in general lower in EREE content,But both the derivatives and their parent rocks have similar REE patterns,which serves as an additional indication of the genetic relationship between them.     

Ground-Space Correlation of TM Data and Its Application to the Prediction of Gold Deposits

It has been inferred and proved by the remote sensing equations under rational hypotheses in atmospheric physics that there is a linear correlation between the ground reflective brightness Wij and the total reflective brightness Rij received in different bands with a remote sensor. Nine models delineating the ground-space correlation between the ground spectra and the optimal bands of images of the typical gold deposits have been established based on the ground-space correlativity and field measurements of the ground spectra of the typical gold deposits in the Ailaoshan area. According to the 9 correlation models, TM images were inverted into ground-space correlation images that are related to the typical gold deposits within the area and then recognized by a computer. Research on the ground . spectra and TM data in the Ailaoshan area shows that the correlation analysis of the ground spectra and TM data of gold deposits can be effectively applied to the prediction of gold deposits, location of prospecti     

秦岭造山带中秦岭群内初始北北东向构造方位及其地质意义

通过对秦岭造山带中古元古代结晶基底岩群之一-秦岭群详细的构造研究,识别出了秦岭群中存在的初始的NNE向构造方位,这一构造方位与中晚元古代以来秦岭造山带NWW向主导性构造方位大相径庭。结合区域地质背景分析,讨论了这一NNE向构造方位的地质意义。提出了古元古代华北克拉通与杨子克拉通可能为一个统一的克拉通,暂称之为古中国克拉通,并且这一克拉通内的主导性构造线方位是NNE向。中元古代初,这一克拉通沿NWW向破裂,才开始了秦岭造山带长期复杂的构造演化历史。     

The interpretation and highlights on mitigation of climate change in IPCC AR6 WGIII report北大核心CSCD

2022年4月4日,IPCC第六次评估报告第三工作组《气候变化2022:减缓气候变化》报告和决策者摘要发布。报告全面评估了2010年以来减缓气候变化领域的最新科学进展,为国际社会深度认识和理解全球温室气体排放情况、不同温升水平下的减排路径以及可持续发展背景下的气候变化减缓和适应行动等提供了重要科学依据。基于报告主要结论,围绕温室气体排放的区域差异、减缓路径分类、与土地利用相关的排放评估及CO去除技术评估等方面的亮点,文中提出在应对气候变化减缓政策行动中,中国应坚定“双碳”战略目标,在综合考虑经济发展阶段和资源禀赋差异背景下,将可持续发展、公平和消除贫困植根于社会发展愿景中实施减缓路径,并加快提升气候变化综合评估核心科学技术的研发进度,以进一步提升国际影响力和话语权。     

Radio observations of the 1968 September solar eclipse

This paper summarizes the analysis of the radio observations of the solar eclipse at wavelengths 3.2, 11.1 and 21 cm in Xinjiang, on 1968 Sept. 22. From the observations, we have determined the flux densities, angular diameters and heights of the localized radio sources on the solar disk, circumstances of the radio eclipse, equivalent radius of the radio Sun and certain features of a small radio burst that occurred during the eclipse. We have also investigated the correlation between the flux density of the localized sources and the activity of the active regions, as measured by the integrated brightness of plages and the sunspot area.     

辽东半岛早元古宙枕状熔岩特征

辽东半岛枕状熔岩位于辽河群大石桥组底部的变质基性岩中。呈椭球状个体,具白色硅铝质外壳。岩枕分带明显,由外向内可分为枕壳、冷凝边、枕内相。枕状熔岩的岩石学、岩石化学和地球化学研究表明,它是海底玄武岩的产物。枕状熔岩的发现为揭示广泛发育于辽东半岛早元古宙变质基性岩的成因提供了证据。