【摘 要】
：
Late Mesozoic Nb-rich basaltic andesites and high-Mg adakitic volcanic rocks from the Hailar-Tamtsag Basin,northeast China,provide important insights into the recycling processes of crustal materials and their role in late Mesozoic lithospheric thinning.T
【机 构】
：
CollegeofEarthSciences,ExplorationandDevelopmentResearchInstitute
【基金项目】
：
supported by the National Natural Science Foundation of China(Grants 41888101 and 92062216).
论文部分内容阅读
Late Mesozoic Nb-rich basaltic andesites and high-Mg adakitic volcanic rocks from the Hailar-Tamtsag Basin,northeast China,provide important insights into the recycling processes of crustal materials and their role in late Mesozoic lithospheric thinning.T
其他文献
Ganga-Brahmaputra-Meghna(GBM)river basin is the third-largest and one of the most populated river basins in the world.As climate change is affecting most of the hydrometeorological variables across the globe,this study investigated the existence of climat
钻井是开发深部地热资源最直接的技术手段,但深部地层处于高温高压环境,其应力分布复杂。本文针对深井井壁围岩变形区分布开展了研究,对各变形区域的岩石力学进行了分析,在力学理论上为深部井壁稳定研究提供了指导。
地热资源地球物理勘探技术是以测量地球物理属性为手段,来表征地热系统。以河南范县为例,并针对该区断裂发育,地层横向变化大,地质条件复杂的难点,作者选取了6种常用的地热勘查物探方法进行了对比试验研究,探索最适宜中深层地热资源勘查的物探综合方法,为今后复杂地质条件的地热勘探提供了有利的参考价值和重要的借鉴意义。
New geochronologic data from midcontinental Laurentia demonstrate that emplacement of the 1476–1470 Ma Wolf River granitic batholith was not an isolated igneou
为了研究高压气体对煤岩材料变形破坏的作用,自主设计并制造了含高压气体煤岩实验装置,通过测量气体泄压作用诱发的煤岩动力破坏现象,研究了高压气体对煤岩材料变形破坏的作用。实验表明,当气体泄压速率小时,煤岩仅会出现轻微变形;当气体泄压速率大时,煤岩会产生破裂和破碎现象。同时发现煤岩的破坏程度不仅取决于气体的泄压速率,还取决于孔隙气体的压强。当气体泄压速率和气体压强都达到一定临界值时,煤岩才会发生剧烈破碎。通过气体压强与应变之间的关系,确定了煤岩发生破裂和破碎的临界气体压强。
The present study aims to develop two hybrid models to optimize the factors and enhance the predictive ability of the landslide susceptibility models.For this,a landslide inventory map was created with 406 historical landslides and 2030 non-landslide poin
The global geological volatile cycle(H,C,N)plays an important role in the long term self-regulation of the Earth system.However,the complex interaction between its deep,solid Earth components(i.e.crust and mantle),Earth’s fluid envelopes(i.e.atmosphere an
本文研究下游行业由特定企业代表全行业进行价格协商且该企业成本存在信息不对称的市场结构中,导致上游产品高价格的机理和条件.研究发现,在一定的下游行业市场需求和企业成本结构条件下,市场存在分离均衡,从而高效率类型的下游谈判企业愿意接受较高价格的上游产品,或者不接受可能的政策扶持,以此发送其高效率的信号,进而减少竞争对手的产量,并提高自身的产量和利润水平.
Rock mechanical parameters and their uncertainties are critical to rock stability analysis,engineering design,and safe construction in rock mechanics and engineering.The back analysis is widely adopted in rock engineering to determine the mechanical param
华南大陆中生代以来受华北板块、西南缘特提斯洋以及东部古太平洋板块会聚作用形成了多序次的构造变形及多期岩浆与成矿事件,并造就了多个重要的多金属成矿区带。文章在梳理成矿区带典型矽卡岩型矿床矿化期次、矿体分布及成矿机理等关键科学问题的基础上,利用构造变形序次及其控岩控矿的规律性完善了典型矿床成矿过程及成因机理。通过对闽西南铁多金属成矿带、赣东北塔前-赋春钨铜多金属成矿带以及滇东南老君山钨锡矿集区开展构造变形解析,结合已有研究成果,厘定出相对完整的印支期、中晚侏罗世及白垩纪3期变形序列,但其作用时限、构造性质、规