机枪扬威索姆河

正这一天,6万英军丧生。1916年2月21日,德军集结重兵向法军防守的凡尔登地区发起了猛烈进攻。战至6月下旬,德军开始大规模使用毒气弹,给法军造成重大伤亡。德军进攻部队的前锋曾一度进抵距凡尔登不足3公里处,凡尔登危在旦夕。为了牵制德军的兵力,减轻凡尔登的压力,英法联军于1916年7月1日晨在法国北部     

芬兰人的桑拿文化

一提起桑拿浴,大家都知道起源在芬兰。芬兰确实是一个桑拿的国度,几乎所有的芬兰人都嗜好桑拿,感觉有点像我们身边过去的澡堂子,让人很轻松、惬意。对芬兰人来说,宁可食无肉,不可居无桑拿。芬兰总人口大约538万,而遍布城乡大大小小的桑拿房据说已经有200多万个。也就是说,平均不到三个芬兰人就拥有一间桑拿房,密度居全球之冠。     

四川盆地北部二叠系－三叠系沉积相与沉积演化

 通过钻井、露头、地震等资料分析,对四川盆地北部地区二三叠系沉积相进行详细研究,识别出碳酸盐岩台地、碳酸盐岩缓坡两大沉积体系,指出研究区二三叠系沉积具有典型的从碳酸盐岩缓坡演化为碳酸盐岩镶边台地沉积的演化过程,中二叠统栖霞组、茅口组及上二叠统吴家坪组发育碳酸盐岩缓坡沉积,上二叠统长兴组过渡为碳酸盐岩镶边台地,飞仙关组沉积末期全区演化为均一化台地。研究成果对本区油气勘探具有一定的参考价值。     

贵州北部汉族头面部6项遗传性状调查分析

调查了贵州省719名大学生的耳垂、卷舌、上眼睑、酒窝、耳耵聍、红绿色盲6对遗传性状的基因频率.结果显示,其中2对性状的隐性基因频率高于显性基因频率;上眼睑性状在男性和女性中分布具有极显著差异;性状之间没有相关性;贵州北部地区汉族多数性状的基因频率与国内其他地区汉族和少数民族存在差异,贵州北部汉族具有独特的遗传性状特征.     

神狐深水海域天然气水合物成藏的气源条件

为深入分析南海北部神狐深水海域天然气水合物形成的气源控制因素,以神狐海域天然气水合物调查区为重
点研究对象,在基础调查资料和相关钻探成果的综合研究基础上,全面探讨了神狐海域天然气水合物成藏的气源供给
条件。研究结果表明：（1）神狐海域浅层400～1 200 m 以内具备良好的适合微生物成因甲烷气体生成条件,生物气生
气潜力巨大;（2）深部古近系文昌组湖相和恩平组煤系两套成熟烃源岩,亦以生气为主,能够提供一定数量的热解气
补充之;（3）深部成熟热解气通过纵向断层或底辟通道垂向运移至浅层海底,在浅部与微生物气一起侧向运移至天然
气水合物稳定域内形成混合型天然气水合物藏。     

智利制定新宪法:国家新征程的开始?

2020年10月26日,智利举行了一项影响深远的公民投票。公投决定了两件大事:第一,智利是否需要新宪法;第二,如果需要,应该由什么样的机构来起草。结果显示,78%的选民赞成制定新宪法,79%的选民赞成通过“制宪会议”形式来制定新宪法。     

陕北退耕还林还草与粮食生产的思考

针对陕北生态环境恶化、经济基础薄弱、坡耕地面积大、粮食持续发展面临着严峻的挑战这一现状,以我国能源与重化工基地的陕西北部25个县(区)为研究对象,在深入调研基础上,根据西部大开发提出的要求,提出了可供陕北粮食持续发展的基本对策。表4,参6。     

庐枞北部火山-次火山成矿作用过程REE分异特征

文章分析了庐枞北部火山-次火山成矿作用过程中稀土元素的分异特征,将该区火山-次火山气液型矿床的主要矿石矿物的稀土配分模型分为3种类型:平坦型、跳跃型和倾斜型;同时还分析了龙桥铁矿床稀土元素分异的定向性演化特征,即成矿由早阶段到晚阶段,随温度的降低,稀土元素的演化趋势是向Eu负异常增大和轻/重稀土元素比值降低的方向进行,稀土配分曲线由倾斜趋于平缓。     

SHRIMP ages of detrital zircons from the Changcheng System in the Ming Tombs area, Beijing： Constraints on the protolith nature and maximum depositional age of the Mesoproterozoic cover of the North China Craton

The Mesoproterozoic Changcheng System is widely distributed in the North China Craton. Determining its time of deposition and sources is important to understand the Precambrian crustal evolution of the North China Craton. This paper suggests age distribution patterns for detrital zircons from clastic sediments of the Changcheng System in the Ming Tombs area, Beijing. Samples of feldspar-bearing sandstone (CHc-2) and pure sandstone (CHc-9) were collected from the Changzhougou Formation, which constitutes the basal part of the Changcheng System. Detrital zircons show an age range from 2.35 to 2.60 Ga. However, sample CHc-9 in the upper Changzhougou Formation also contains some zircons with ages of 1.9-1.8 Ga and 2.3-2.1 Ga. The age patterns lead to the following conclusions: (1) Most of the detrital material came from a source area composed predominantly of -2.5 Ga continental crust of the North China Craton; (2) 1.9--1.8 Ga reflects the age record of Palaeoproterozoic continent-continent collisional event in the North China Craton; and (3) the oldest age for deposition of the Changcheng System is 1.8 Ga.     

Surface pollen and vegetation reconstruction from central and northern mountains of Taiwan

Surface pollen from various montane vegetations in Shalixian Mt.and Lepei Mt.of central and northern Taiwan have been explored and analyzed.The pollen data were used to simulate vegetation types by using the biomisation technique,Computing three matrixes of pollen taxa , plant functional types and combined biomes,vegetation types at each site have been finally defined through the fuzz selections of a tie-breaking rule.The results show that surface pollen data can simulate the subtropical Castanopsis and Cyclobalanopsis forests.alpine warm-temperate Quercus and Quercus-Pinus forests,and alpine temperate/cool-temperate conifers of Tsuge-Picea and Picea-Abies forests.Simulated elevations of the,forests are similar to actual locations of the forests.This study can add vertical surface pollen data for extending investigation of various vegetation types in China,provide PFT schemes and vegetation types in low-latitude and montane areas,and be applied as modern analogues for fossil pollen in order to reconstruct Quaternary vegetations.