三叠纪幻龙研究进展及存在的问题

随着欧洲及中国华南三叠纪地层中具有头后骨骼的幻龙属新材料的发现, 幻龙属的研究近年取得新进展。通过分析前人对幻龙属内各物种的分类学沿革、地层发生顺序及古地理分布的研究, 认为幻龙最早出现于安尼期早期, 在安尼期晚期至拉丁期早期达到繁盛期, 在卡尼期早期绝灭。结合幻龙属的分支谱系分析, 认为其可能的迁移路线为: 在欧洲, 由荷兰迁移至德国和以色列。关于幻龙最早出现于西特提斯还是东特提斯, 目前尚无定论。     

中国西医教育之发端:天津总督医学堂

天津总督医学堂是我国第一所官办的西医学校——北洋水师医学堂的前身。这所学校的成立,对于西方医学在中国的传播和植根,意义重大。在这所学校的成立过程中,伦敦会的传教士马根济和直隶总督李鸿章都发挥了关键性的作用。本文探究了这所学校成立的真正原因和历史过程,认为这所学校的成立,军事上的原因是最主要的,而并非是李鸿章信奉西医的结果。文章分析了学校的教学情况,认为当时在天津的传教士们,为这所学校提供了最新的教材和先进的教学设备,而且,这所学校的毕业生相比于其它教会学校的毕业生,享有特殊的待遇。然而,由于历史的局限性,学生在毕业以后,出路并不理想,学校也面临了很多的困难。因此,这所学校主要的意义在于它的象征性,它是中国西医教育的发端,开拓了中国西医教育领域中西合作的新模式,它起步艰难,然而意义不凡。     

广州地区晚第四纪孢粉气候研究

 利用广州地区南北2个不同沉积地貌区的钻孔进行孢粉分析,结合测年和沉积信息,分析了广州所代表的珠江三角洲地区晚更新世以来的沉积环境和气候变化。孢粉分析结果显示：在晚更新世珠江三角洲地区气候经历了偏冷干-偏凉干-暖湿-热湿-偏凉干-冷干的变化过程,末次冰期对本区具有明显影响,使全新世和晚更新世孢粉组合表现出一定的差异;全新世气候明显转暖湿,整体上以暖湿为主,但出现了一些小的气候波动事件,最明显的是在2 250 a BP 前后偏凉干的变化;该区在晚更新世和全新世各经历过一次海侵,两孔反映的气候期和海平面变化较为一致,气候和海平面变化也有很好的对应。两孔在地层、沉积相和孢粉特征上的差异是地理位置、沉积环境和基座地貌等差异造成的。     

晚明江右士人王塘南"全归"思想探析

王塘南"全归"思想的具体内涵主要体现在以下几个层面:其一,"全归"有别于"善恶之名"而指向"全其本心之仁";其二,"全归"有别于"形气"之"可朽"而指向"真性"、"精神灵爽"之"不朽";其三,"全归"有别于"拘于枝节"而指向"直透真性";其四,"全归"有别于"有所为而为"而指向"为其所当为".不仅如此,塘南"全归"思想亦有一定历史渊源,且在宋明以"全归"释生死的儒家生死观的建构上具有承上启下之意义.     

First ceratopsid dinosaur from China and its biogeographical implications

Ceratopsid dinosaurs represent one of the best known dinosaur groups in the Late Cretaceous, and their unquestionable fossil re-cords are exclusively restricted to western North America.Here we report a new ceratopsid dinosaur, Sinoceratops zhuchengensis gen.et sp.nov., from the Upper Cretaceous Wangshi Group of Zhucheng, Shandong Province, China.Cladistic analysis places this new taxon as the only known ceratopsid from outside North America, in a basal position within the Centrosaurinae.It is con-siderably...     

春风油田排66块火成岩储层成因模式分析

排66块石炭系火成岩岩性复杂、储集空间类型多样,有利储层发育规律和分布模式认识不清。为实现油藏有效动用,有必要开展储层成因模式的分析,指导油藏开发。基于岩芯、成像和分析化验资料,利用地质统计学方法确定本区的主要岩石类型为安山岩和凝灰岩,主要的储集空间包括溶蚀孔洞、裂缝,原生孔隙发育程度弱,无法独自形成有效储层。通过对3种储层类型分布规律的研究,建立了本区火成岩储层的成因模式：岩性控制了储层的范围、构造运动是裂缝形成的直接原因、成岩作用塑造现今储层的发育规律,缝洞储层一般沿断层带分布,在纵向上受控于有利成岩相带。     

贵州关岭晚三叠世邓氏贵州鱼龙（Guizhouichthyosaurus tangae Cao and Luo in Yin et al., 2000）的讨论

贵州省关岭县新铺地区晚三叠世法郎组瓦窑段下部的鱼龙标本保存完整、精美,对它们准确而详细的描述将对研究鱼龙类分类、演化和完善其演化谱系具有重要的意义。目前对其中大型鱼龙已有Guizhouichthyosaurus tangae、Typicusichthyosaurus tsaihuae、Guanlingsaurus liangae、Cymbospondylus asiaticus、Panjiangsaurus epicharis等5个命名。在野外调查、室内修理、观察、比较的基础上,补充、修正了Guizhouichthyosaurus tangae的描述,并认为Cymbospondylus asiaticus和Panjiangsaurus epicharis应为Guizhouichthyosaurus tangae的同物异名。     

Late quaternary upper-water column structure in upwelling areas of the South China Sea

Based on a quantitative analysis of planktonic foraminifera in two gravity cores (17928 and 17954), the history of the upper-water structure of the eastern and west ern slopes of the South China Sea (SCS) over the last 220 Ka was reconstructed using the transfer function technique. Our results show that lower sea surface temperature (SST) and shallower depth of thermocline (DOT) exist at Core 17928, off Luzon, in the glacial periods; on the contrary, the same situation turned up in the interglacial at Core 17954, off Vietnam. These changes of the upper-water column structure in the two areas are induced by coastal upwelling, which in turn is driven by monsoons, namely, winter monsoon leads to upwelling at the eastern slope, and summer monsoon gives birth to upwelling on the western slope. Moreover, the intensity of upwellings is also closely related to the evolution of the East Asian monsoon. Therefore, we assume that the changes of the upwelling in the two sites indicate strengthenning of winter and summer monsoon during the glacial and inter glacial periods, respectively.     

Provincialism of the late Middle through middle Late Cambrian paraconodonts and protoconodonts

Quantitative paleoprovincialism is studied, using a coefficient of similarity (CS) formula. The results indicate that the provincialism of the late Middle through middle Late Cambrian paraconodonts and protoconodonts did exist. The provincialism of Ordovician conodonts can be traced back to late Middle Cambrian. The North China Province and South China Province can be recognized in late Middle Cambrian, whereas the North China Province, South China Province and Balitca Province can be recognized respectively in early Late Cambrian and middle Late Cambrian. The possibility that the larger units of provincialism, i.e. Faunal Regions existed in the areas mentioned above is discussed. It is inferred that the Midcontinent Faunal Region and the Atlantic Faunal Region had existed in early Late Cambrian and middle Late Cambrian. The North China Province was the secondary unit of provincialism in the Midcontinent Faunal Region, while the Baltica Province was that in the Atlantic Faunal Region. The South China Province is the secondary unit of provincialism between the two largest units of provincialism. Moreover, the comparison with the trilobite provincialism which has been accumulated on a solid basis of research is made, and the paleogeographic positions of North China Massif, South China Massif and Tarim Massif are revised.     

海南岛西北部晚更新世海滩岩地球化学特征及其古环境意义

海滩岩是形成于潮间带,由碳酸盐胶结海滩沉积物而成的一种海岸带碳酸盐胶结岩,对于研究古海平面变化、海岸带演化以及古气候变化等海陆相互作用过程具有重要意义。对海滩岩的岩石学、地球化学特征进行了研究,结果表明：海滩岩主量元素与上部陆壳(upper continental crust, UCC)的平均含量比较,显著富集MgO和CaO,略富集MnO,其他均亏损,其中Na₂O亏损最大。6件海滩岩稀土元素(rare earth element, REE)总体呈微弱的右倾轻稀土富集型曲线,轻、重稀土分异不强,以Eu弱负异常,Ce弱负异常及La弱正异常为特征;从早到晚,Al₂O₃/MgO比值变小和陆源碎屑组分SiO₂、Al₂O₃、Na₂O、K₂O、TiO₂等含量逐渐下降共同反映陆源的化学风化减弱,气候越来越干旱。古盐度Z值、Sr/Ba、Rb/K、V/Cr、V/(V+Ni)和稀土元素判别研究区为弱氧化-氧化的海...