新疆准噶尔与华南湘中法门期碳同位素特征的对比研究

针对新疆准噶尔盆地西北缘洪古勒楞组下段是否存在弗拉-法门阶界线的问题,对比研究布龙果尔剖面该段地层以及湖南中部锡矿山剖面上泥盆统法门阶中下部碳酸盐岩的碳同位素特征,并结合已有的生物地层学证据,重新讨论洪古勒楞组下段的时代。结果表明,布龙果尔剖面洪古勒楞组下段碳同位素的变化趋势与国内外诸多典型剖面弗拉-法门期之交的δ~(13)C偏移明显不同:未见到显著正偏移;布龙果尔剖面δ~(13)C在0~1‰范围内变化,小于国际上目前已知的弗拉-法门期之交δ~(13)C正偏移的幅度(2‰~3‰)。布龙果尔剖面洪古勒楞组下段可能不存在弗拉期地层,甚至可能缺失法门阶底部(牙形石Pa.triangularis带)。法门早中期,布龙果尔剖面碳同位素曲线可与湖南锡矿山剖面同时期地层进行较好的对比,分为3个阶段:2个完整的正偏—负偏旋回以及之上的小幅正偏。主量元素特征表明,布龙果尔剖面第3-1层的下半部受陆源物质影响较大,推测可能与区域构造活动变强烈有关。     

The age measures and its layer sequence tratigraphy of Late Quaternary sediment in Lushan Dajiaochang of China

Through the scientific investigation on Lushan for a long time, detailed studies have been carried out on the geologic stratum section of Late Quaternary in Dajiaochang. The series age data of complete stratigraphic section and full time formation since 400 kaBP were based on the results of the analyses using the dating methods with various instruments such as the ancient geomagnetism, electronics spin resonance （ESR）, 36C1 and lumines- cence dating, etc. Corresponding to these data, it identified the paleomagnetic polarity events including Biwa- III event （320 kaBP）, Biwa- 1I event （260 kaBP）, Biwa- I event （180 kaBP, scarcity due to the disturbance of the iron dish）, Blake event （100 kaBP） and Laschamp event （20 kaBP, didn＇t grow due to the activities of the surface）, etc. Combined with the sequence stratigraphy, layer type characteristics and its sediment environment, the strati- graphic can be divided into 4 stages of development respectively ： Stage [ is the climate period of glacial epoch （200-400 kaBP）; stage 11 is the climate period of interglacial epoch （100-200 kaBP）; stage llI is the climate peri- od of periglacial epoch （10-100 kaBP）; stage IV is the climate period ofpostglacial epoch （0-10 kaBP）.     

东北地区晚石炭世岩相古地理研究

利用野外地质剖面、关键钻井剖面和区域地质资料,在地层划分与对比、构造格局以及早石炭世研究的基础上,从点—线—面的沉积相分析入手,将晚石炭世的巴什基尔期—格舍尔期作为一个编图单元进行岩相古地理编图,恢复了东北地区晚石炭世的岩相古地理面貌。研究表明,东北地区晚石炭世主要发育浅海陆棚沉积体系、台地沉积体系、障壁海岸沉积体系、河流沉积体系及湖泊沉积体系;研究区存在漠河及佳木斯两个主要的古陆区,物源区碎屑物质供应丰富,其余地区以海相沉积为主,仅北侧黑河-松辽地区和东部饶河地区尚存河流相沉积区。在前人研究成果基础上,融合近年来东北地区地层精细划分和对比、构造演化的新认识,形成了一套更加精细的岩相古地理图。     

敦煌盆地中侏罗世火山岩的地球化学特征及其地质意义

敦煌盆地托格,多坝沟和芦草沟等地中侏罗世火山岩属于碱性玄武岩,其微量元素和稀土元素特征表明,该火山岩与典型大陆裂谷碱性玄武岩相似,属于张性作用的产物,区域和盆地分析说明,三地区火山作用同一条张性断裂控制。火山岩地球化学纵向上的演化受结晶分异作用的控制,横向上的变化,受地幔隆起程度和部分熔融程度影响。     

中国东南部晚中生代伸展应力体制的岩石学标志

在中国东南部晚中生代时期（J2－K2），发育着大规模岩墙群、广泛的岩浆混合作用（包括侵入杂岩中的岩浆混合和火山岩中的复合岩流／双峰式火山岩）、大范围玄武岩浆的底侵、巨型链状火山岩带、晶洞花岗岩－A型花岗岩带、变质核杂岩，以及玄武岩的无斑隐晶－细粒结构和花岗岩的均匀块状结构。对它们的研究表明，它们形成于伸展应力体制，是伸展构造的岩石学标志，发生在晚中生代整个地质时期，并认为这一伸展构造由古太平洋库拉板块对欧亚板块的消减作用诱发。     

A new Odonata family from the Jurassic of Central Asia (Odonata: Epiproctophora)

The new damsel‐dragonfly family Paragonophlebiidae is described based on a new genus and two new species from the Middle‐Late Jurassic of Central Asia.     

殷商畜牛考

殷墟曾出土大量哺乳动物遗存,此等遗存应可反映殷商安阳一带之家畜及野生动物的种类与数量。德日进、杨钟健曾全面考察殷墟哺乳动物遗存,发现牛属及水牛属各一种,但并未深究孰为畜牛。该文以牛形及牛首形器、岩画、青铜器狩猎纹、甲骨文等作考证,判明殷商之畜牛是一种上古水牛（Bubalusmophistopheles）,并根据考证提出若干前瞻性讨论。     

The Jurassic System in SW Japan: review of recent research

The present state of the art in Jurassic oceanicplate stratigraphy in Japan is the result of research over the last two decades. Radiolarian biochronology puts age constraints on the development of fore-arc basin deposits, which cover Permian and Jurassic accretionary complexes of the Outer Zone, facing the Pacific. Special attention is given to the “Torinosu-type” reef-limestone blocks in the Upper Jurassic-Lower Cretaceous fore-arc basin deposits that derived from a shallow-marine continental margin such as the Inner Zone shelf, facing Eurasia. Further progress was achieved in dating and defining sedimentary environments in the Inner Zone Tetori Group. Erosive events during the process of Jurassic accretion are also discussed in relation to the Late Mesozoic geologic and tectonic setting.     

Aspects of Romanian Early-Middle Jurassic palaeobotany and palynology. Part VII. Successions and floras

The Jurassic floras of Romania occur in the Carpathian Mountains and in Dobrogea (Eastern Romania). In the South Carpathians, diverse and well preserved floras have been recorded since the middle of the 19th Century in the Resita, Sirinia, Presacina, CernaJiu, Holbav and Cristian Basins. The ages of these floras range between Hettangian and Sinemurian, with representatives belonging to Bryophytes, Pteridophytes and Gymnosperms. Excellent preservation and diversity were recorded in Anina, in the central area of the Resita Basin, a possible fossile-Lagerst?tte locality. The 3D collecting opportunities due to underground coal mining permitted detailed phytostratigraphical studies. These studies showed a floral change at the Hettangian-Sinemurian boundary, related to climate change. The Jurassic coal basins of the South Carpathians show both intramontainous and paralic features. The Resita Basin is a typical intramountainous depression basin, while the other basins are influenced by the marine realm. From a paleogeographical point of view, the Romanian Early and Middle Jurassic floras occurred on the northern frame of the Tethys realm, floristic features indicating the Eurosinian Province. One of the closest floras in terms of floristic similarities is the Iranian Early Jurassic flora. In the Apuseni Mountains, the HettangianSinemurian flora is less well-preserved and diverse than those of the South Carpathians. The Middle Jurassic flora of Romania is confined to Dobrogea (Eastern Romania), where a bennettite-dominated assemblage with low diversity and preservation was recorded.     

Revision of “Parahagla lamina” Lin, 1982 and two new species of Aboilus (Orthoptera: Prophalangopsidae) from the EarlyMiddle Jurassic of Northwest China

The Lower and Middle Jurassic insects are rather poorly known from Northwest China. Here we restudy Parahagla lamina Lin, 1982 and transfer it from “Parahagla” to Aboilus Martynov, 1925. On the basis of the female forewing, we described two new species of the EarlyMiddle Jurassic, Aboilus tuzigouensis sp. nov. caome from Badaowan Foramtion at Tuzigou, Kelamayi, Xinjiang, Northwest China and A. jiyuanensis sp. nov. from Ma’ao Group, Jiyuan, Henan Province, Central China. The differences of the new materials from the other known species and their systematic positions are also discussed.