河南泌阳断陷湖盆等时层序地层框架模式探讨

泌阳断陷等时层序地层框架模式,反映了陆相层序展布特征及其沉积体系时空配置关系,揭示了断陷湖盆成盆演化史及沉积充填史。泌阳断陷沉积充填史划分为三个阶段（初始断陷充填阶段、主断陷充填阶段及坳陷充填阶段）,并对应着三个盆地充填序列及其相应的构造层序。其中第二阶段包括强烈断陷充填亚阶段、稳定断陷充填亚阶段及断陷萎缩充填亚阶段,其沉积速率有由大到小的变化规律。早第三纪泌阳断陷湖盆经历了四个演化历程：山前洪水     

泌阳断陷湖盆古湖泊演化模式初探

泌阳断陷湖盆沉积充填史划分为三个阶段：初始断陷充填阶段、主断陷充填阶段及坳陷充填阶段,并对应着三个盆地充填序列及其相应的构造层序。其中第二阶段包括强烈断陷充填亚阶段、稳定断陷充填亚阶段及断陷萎缩充填亚阶段,其沉积速率有由大到小的变化规律。早第三纪泌阳断陷湖盆经历了四个演化历程：山前洪水洼地→硫酸盐型滨浅湖→正常湖泊→碳酸盐型或硫酸盐型滨浅湖;相应地,湖盆南部边缘（陡坡带）和北部边缘（缓坡带）沉积楔状体演变过程分别为：冲积扇→陡坡型扇三角洲→缓坡型扇三角洲→冲积扇和冲积扇→三角洲→冲积扇。随着硫酸盐类矿物沉淀的增多,泌阳断陷湖盆最终走向消亡。     

泌阳断陷陆相层序外部构型研究

摘 要　 泌阳断陷陆相层序外部构型研究包括层序级别的厘定与划分以及界面的类型及其识 别标志。陆相层序构成单元可分为8个级别‚前4级属低频层序‚后4级为高频层序。泌阳 断陷湖盆的3类盆地原型‚分别形成了3套盆地充填序列及其所对应的3个构造层序 （Ⅰ‚ Ⅱ‚Ⅲ）;构造层序Ⅱ为该断陷湖盆的沉积充填主体‚可进一步划分为7个层序组‚其中在层 序组Ⅱ D （即核三段上） 中可识别出3个层序。陆相层序的体系域具四分性：低水位体系域、 水进体系域、高水位体系域及水退体系域;小层序组有4种基本类型：进积小层序组、低位 加积小层序组、退积小层序组和高位加积小层序组。     

泌阳断陷下第三系核三上亚段层序地层学研究

根据陆相层序在地震剖面及电测曲线上的识别标志和在岩石矿物学方面的旋回性特征,采用沉积旋回分析技术及Ｆｉｓｃｈｅｒ图解法,将泌阳断陷双河—赵凹地区下第三系核三段上亚段划分为３个陆相层序,其沉积体系呈现冲积扇—扇三角洲—湖相空间配置关系。在这３个陆相层序中共发育小层序组１３个,其中可识别的小层序达５０余个。针对研究区目的层段所划３个陆相层序发育的共同特点,在连井剖面层序地层对比的基础上,编制了研究区目的层段的陆相层序地层等时框架模式。     

黄县早第三纪断陷盆地高分辨率层序地层划分

详细研究了黄县煤田早第三纪断陷盆地沉积填序列和沉积体系,研究了基准面旋回特点,进行了高分辨率层序地层划分。研究表明,黄县断陷盆地下第三系为１个构造层序,是一个完整的原型断陷盆地沉积充填序列。可划分出２个三级层序,且具有三元结构,即由低水位、水进和高水位体系域组成;层序Ｉ低水位体系域由早期和晚期两部分组成,层序Ⅱ高水位体系域亦有早期和晚期两部分构成。主要沉积体系有：扇三角洲体系、湖底扇体系、辫状河三     

泌阳凹陷下第三系构造特征与沉积体系

在深入研究泌阳凹陷大量岩心、测井和地震资料的基础上,证实泌阳凹陷具有独特的盆地结构样式和形成机制。南侧及东侧盆地主控断裂发育区为陡坡生长断裂型层序分布区,北侧为典型的缓坡型层序样式,相似于墨西哥湾生长断层层序地层模式。通过对层序体系域构成具有重要控制作用的独特的构造背景条件分析,建立了泌阳凹陷断陷湖盆层序地层模式,认为泌阳凹陷断陷湖盆完整的陆相层序体系域具有四分性:低水位体系域、水进体系域、高水位体系域及水退体系域。分析了主要含油层段下第三系核桃园组地层发育三种类型的三角洲沉积砂体：扇三角洲、近源三角洲和远源三角洲,并对其储集性能进行了分析比较。     

泌阳断陷湖盆陆相层序内部构型研究

断陷湖盆陆相层序内部构型主要研究各级层序单元内部不同环境下形成的地质及其在空间上的配置关系。盆地充填序列及构造层序可用沉积总体样式来反映其内部构型;地震层序（层序组）及层序可用沉积体系来描述其内部构型;体系域（小层序组）,小层序及小层单元可分别用沉积相（亚相）,微相及岩性相来刻划其内部构型。泌阳断陷层序组ⅡＤ（即核三上段）是其油气勘探的主要目的层段,其中包含三个陆相层序,在双河一赵凹地区表现为总和     

六盘山一带下白垩统沉积体系分析及层序地层研究

六盘山一带下白垩统属陆相断陷盆地沉积 ,发育有冲积扇、辫状三角洲及湖泊等三大类沉积体系 ,对应的亚、微相沉积体相互叠置 ,横向上具可追索性。通过陆相层序地层学分析 ,认为六盘山地区早白垩世地层构成一列完整的内陆盆地充填三级层序。根据沉积体系发育特征及空间配置样式 ,在层序内部划分出低水位体系域、湖盆边缘体系域、扩张体系域、收缩体系域等 4种体系域类型 ,记录了盆地从初始充填—湖盆扩张—萎缩消亡的全过程。     

东营凹陷第三纪层序地层格架及沉积体系类型

根据钻井岩心、录井资料、测井曲线及三维地震反射特征,以层序地层学和沉积体系分析为指导,建立了东营凹陷第三纪充填序列和层序地层格架。凹陷充填可分为下第三系的张扭断陷充填和上第三系的压扭拗陷充填。前者可进一步分为初始沉降、加速沉降和湖盆萎缩３个阶段。东营凹陷层序地层格架由２个构造层序、５个超层序组成,其中下第三系可进一步划分为６个层序。第三系主要发育６种沉积体系;识别出３种不同于被动大陆边缘盆地的体系域,包括冲积体系域、扩展体系域和萎缩体系域。沉积体系、体系域的时空展布与凹陷的构造演化阶段和凹陷的边界条件密切相关。     

泌阳断陷陡坡带陆相层序发育的可容空间图解探讨

泌阳断陷湖盆基底构造沉降为非线性函数或间断函数,且呈“反铰链式”沉降。在湖平面变化和构造沉降共同作用下,泌阳断陷湖盆陡坡带的可容空间变化仅有三种可能性：ａ．南缘及北缘减小,中央带增加;ｂ．南缘不变,中央带及北缘增加;ｃ．南缘、中央带及北缘均增加。针对这三种情况,分别在不同的物源供给速率条件下,分析了断陷湖盆陡坡带不同构造部位的剩余可容空间变化规律及其相应沉积特征。文中以泌阳断陷双河－赵凹地区为例,探讨了参照井选择的可容空间机理,对下第三系核三一段的陆相层序进行了划分,建立了其等时层序框架模式。     

The terrestrial fauna of the Late Triassic Pant-y-ffynnon Quarry fissures,South Wales,UK and a new species of Clevosaurus (Lepidosauria: Rhynchocephalia)

Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco.     

The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts

The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H₂O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H₂O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species.     

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