辽宁东部中寒武世徐庄期三叶虫动物群

详细研究了辽宁东部中寒武世徐庄期的三叶虫动物群,包括45个种,分属于23个属和2个亚属.在此基础上,将中寒武统徐庄阶划分了7个生物带,其中新建生物带1个,新划分出生物带2个,并与有关地区进行了对比.     

新疆库鲁克塔格寒武纪三叶虫动物群序列

新疆寒武纪三叶虫动物群可分为三个生物地理区:1.天山型动物群——博罗科努山区;2.华北型动物群——柯坪区;3.过渡型(库鲁克塔格型)动物群——库鲁克塔格区.库鲁克塔格寒武纪三叶虫动物群序列自下而上可分出13个化石带:下寒武统西大山组2个带;中寒武统莫合尔山组4个带;上寒武统突尔沙克塔格组7个带.     

新疆博罗科努山寒武纪三叶虫新材料

新疆博罗科努山寒武纪地层颇为发育,虽然发现及研究较晚,但通过1977—1983年笔者和王景斌、成守德等对本区地层以及笔者和项礼文对三叶虫动物群的研究,本区寒武纪地层和三叶虫动物群研究已达到相当高的精度,建立了一个三叶虫化石组合和九个三叶虫化石带,这是目前我国中寒武统上部至上寒武统三叶虫化石带最完整的地区之一,并可进行洲际     

吉林南部晚寒武世凤山期三叶虫动物群兼论寒武－奥陶系界线

吉林南部晚寒武世及早奥陶世地层层序连续完整，三叶虫化石丰富。本文将上寒武统凤山阶划分为５个生物带，并与有关地区进行对比，讨论了寒武－奥陶系界线。三叶虫包括５３个种，分属２６个属。由于篇幅所限，仅描述少数属种。     

吉林南部晚寒武世凤山朝三叶虫动物兼论寒武—奥陶系界线

吉林南部晚寒武世及早奥陶世地层层序连续完整，三叶虫化石丰富。本文将上寒武统凤阶划分为５个生物带，并与有关地区进行对比，讨论了寒武－奥陶系界线。三叶虫包括５３个种，分属２６个属。由于篇幅所限，仅描述少数属种。     

辽东半岛上寒武统长山阶生物地层分带及对比

根据辽东半岛上寒武统长山阶三叶虫的纵向分布和演化序列,划分了6个生物带和2个亚带,其中新建立生物带2个.并与国内外进行了对比.长山期三叶虫包括80个种,分属50个属或亚属.由于篇幅所限,本文仅描述部分新种,地层剖面从略.     

华北地层大区东南区寒武纪早期地层对比与统一划分

华北地层大区东南区的寒武纪早期地层 ,宜统一划分为6个三叶虫化石带(Shantungaspis,Yaojiayuella ,Qiaotouaspis,Redlichia(Pteroredlichia) ,Megapalaeolenus和Hsuaspis)和3个组(毛庄组、馒头组和猴家山组)。毛庄组包含Shantungaspis带 ,Yaojiayuella带和Qiaotouaspis带一部分 ,馒头组包含Qiaotouaspis带大部分、Redlichia(Pteroredlichia)带和Megapaeolenus带 ,猴家山组仅含Hsuapis带。前2带属毛庄阶 ,第3、4带属龙王庙阶 ,后2带属沧浪铺阶。中、下寒武统界线划在毛庄阶与龙王庙阶即Yaojiayuella带与Qiaotouaspis带之间。毛庄组属下—中寒武统 ,其它2组属下寒武统。按各组的岩层组合特征 ,统一划分为15个岩性段     

陕西韩城寒武纪三叶虫生物地层

陕西韩城寒武系出露良好 ,化石丰富 ,假整合覆盖于厚约 2 0 m的霍山组石英砂岩之上 ,从下寒武统上部至奥陶系为沉积连续。本区寒武系主要以紫色和黄色泥页岩、泥灰岩、灰岩和白云质灰岩为主 ,从下到上可划分为馒头组、毛庄组、徐庄组、张夏组和三山子组。根据在本区寒武系发现的三叶虫化石 ,韩城地区寒武系可划分为 14个生物带 ,自上而下为 :Blackwelderia带 ,Damesella带 ,L iopeishania带 ,Dorpyge richthofeni带 ,Crepicephalina带 ,Manchuriella带 ,Poriagraulos带 ,Inouyops带 ,Sunaspis带 ,H suchuagia带 ,Shantungaspis带 ,Probowmaniella带 ,Weijiaspis带和 Redlichia murakamii带。     

甘肃北山寒武纪地层的划分意见

甘肃北山地区的寒武纪地层出露比较定整,断续分布在晚前寒武纪断陷盆地之中,岩性稳定,厚度不大,含有相当丰富的古生物化石,是研究中国寒武纪南北两大生物群的重要地区之一。1964年中国科学院兰州地质所刘光夏、陈立军等在大豁落井发现了早和晚寒武世三叶虫,为北山地区寒武纪地层的划分及对比提供了化石依据,并根据三叶虫将本区的寒武纪地层自上而下划分为,中及上寒武统:马宗山群;下寒武统大葫芦组,双鹰山组。     

澳大利亚寒武系生物地层研究新进展(英文)

澳大利亚寒武系集中分布在一南北向分布的从澳大利亚的北部、中部直到南澳大利亚克拉通地块上,少量寒武纪地层分布在新南威尔士、维多利亚和塔斯马尼亚。寒武系的底在中澳大利亚的Amadeus盆地出露得最好。下寒武统(大致相当于纽芬兰统和第二统)在澳大利亚北部大多数是不含化石的火山岩,而在澳大利亚中部和南澳大利亚的盆地中,其中最有名的是南澳大利亚的Arrowie和Stansbury盆地则是各种含化石的巨厚沉积序列。澳大利亚的下寒武统没有分阶方案,尽管在生物地层研究上最近取得很大进展,现在可以利用疑源类、遗迹化石、古杯类、三叶虫、腕足类、软体动物和其他小壳化石进行化石带的划分。很长一段时间内澳大利亚中部和北部的Ord-ian阶被认为是中寒武世最早期的,现在证明它可能相当于第二统的全部或者一部分;含化石的中寒武统和芙蓉统(或上寒武统)在Georgina盆地东部发育非常完整,在中澳大利亚、新南威尔士、维多利亚和塔斯马尼亚也可见到,都可以划分到阶。芙蓉统的底大致与Idamean阶的底相当。化石带的建立主要综合考虑球接子三叶虫、多节类三叶虫,自Iverian期晚期起再加上牙形类化石。寒武系的顶大致相当于Warendan阶的底,相关地层在Georgina盆地东部发育得很好。     

Définition d'une limite multicritère ; stratigraphie du passage Campanien–Maastrichtien du site géologique de Tercis (Landes,SW France)Definition of a multi-criteria boundary; stratigraphy of the Campanian–Maastrichtian interval of the geological site at Tercis (Landes,SW France)

Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414.     

Quaternary stresses revealed by calcite twinning inversion: insights from observations in the Savonnières underground quarry (eastern France)

Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ₁ roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena. To cite this article: M. Rocher et al., C. R. Geoscience 335 (2003).     

HYDROGEOLOGY

正20141756 Chen Ruige(Mathematical College,China University of Geosciences,Beijing100083,China);Zhou Xun Numerical Simulation of Groundwater Level Fluctuation in a Coastal Confined Aquifer with Sloping Initial Groundwater Level Induced by the Tide(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(7),2013,p.1099-1104,6 illus.,16 refs.) Key words:confined water,groundwater level     

METAMORPHIC PETROLOGY

正20141408 Cai Jia(Institute of Geology,Chinese Academy of Geological Sciences,Beijing100037,China);Liu Fulai Petrogenesis and Metamorphic P-T Conditions of Garnet-Spinel-Biotitebearing Paragneiss in Danangou Area,Daqingshan-Wulashan Metamorphic Complex Belt(Acta Petrologica Sinica,ISSN1000-0569,CN11-1922/P,29(7),     

SERIALS

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GEOPHYSICAL EXPLORATION

正20142386An Guoying(China Aero Geophysical Survey and Remote Sensing Center for Land and Resources,Beijing 100083,China)Application of Satellite Remote Sensing in Regional Hydrogeological Investigation:Taking Cenozoic Strata in Wenquan Sheet(1∶250 000)of Karakoram Range as an Example(Geosci-     

QUATERNARY GEOLOGY & GEOMORPHOLOGY

正20141016An Chengbang(Key Laboratory of Western China’s Environmental Systems,Ministry of Education,Lanzhou University,Lanzhou 730000,China);Zhao Yongtao Lake Records during the Last Glacial Maximum from Xinjiang,NW China and Their Climatic Impli-     

PETROLEUM GEOLOGY

正20141538 Cao Qing(School of Earth Sciences and Engineering,Xi’an Petroleum University,Xi’an 710065,China);Zhao Jingzhou Characteristics and Significance of Fluid Inclusions from Majiagou Formation,Yichuan Huangling Area,Ordos Basin(Advances in Earth Science,ISSN1001-8166,CN62-1091/P,28(7),2013,p.819-828,7 illus.,3 tables,43 refs.)     

GEOCHEMISTRY

正20142002 Wei Hualing(Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang065000,China);Zhou Guohua Element Content and Mineral Compositions in Different Sizes of Soil in Tongling Area,Anhui Province(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(11),2013,p.1861     

ENGINEERING GEOLOGY

正20141768 An Shaopeng(Institute of Rock and Soil Mechannics,Chinese Academy of Sciences,Wuhan 430071,China);Wei Lide Experimental Study on Mechanical Behavior of Xigeda Formation Siltstone and Structure Interface(Journal of Engineering Geology,ISSN1004-9665,CN11-3249/P,21(5),2013,p.702-708,9illus.,1 table,16 refs.)