To the problem of stage subdivision of the Lower Cambrian

It was a serious mistake when subdivision stratotypes had been disposed of in practice of constructing the General stratigraphic scale, because they cannot be substituted by the boundary stratotypes. A subdivision stratotype and respective GSSP are complementary parts characterizing any stratigraphic unit. The best candidates for stage stratotypes of the Lower Cambrian are certainly sections of the Lena-Aldan region in the Siberian platform, which have been studied in detail during many years, are well exposed, and contain abundant and diverse fossils, being insignificantly disturbed by tectonic dislocations. Nomenclature, stage and boundary stratotypes of the Siberian standard can be successfully used therefore for stratigraphic subdivision of the Lower Cambrian.     

Demise of the northern Tethyan Urgonian carbonate platform and subsequent transition towards pelagic conditions: The sedimentary record of the Col de la Plaine Morte area, central Switzerland

The sedimentary succession of the Col de la Plaine Morte area (Helvetic Alps, central Switzerland) documents the disappearance of the northern Tethyan Urgonian platform in unprecedented detail and suggests stepwise platform demise, with each drowning phase documented by erosion and phosphogenesis. The first identified drowning phase terminated Urgonian carbonate production in a predominantly photozoan mode. Using a correlation of the whole-rock δ¹³C record with the well-dated record from SE France, its age is inferred to as Middle Early Aptian (near the boundary between the weissi and deshayesi zones). A subsequent drowning phase is dated by ammonites and by a correlation of the whole-rock δ¹³C record as Late Early Aptian (late deshayesi to early furcata zone). A third drowning phase provides an ammonite-based age of Early Late Aptian (subnodosocostatum and melchioris zones) and is part of a widely recognized phase of sediment condensation and phosphogenesis, which is dated as latest Early to Middle Late Aptian (late furcata zone to near the boundary of the melchioris and nolani zones). The fourth and final drowning phase started in the latest Aptian (jacobi zone) as is also indicated by ammonite findings at the Col de la Plaine Morte. The phases of renewed platform-carbonate production intervening between the drowning phases were all in a heterozoan mode.

During the ultimate drowning phase, phosphogenesis continued until the Early Middle Albian, whereas condensation processes lasted until the Middle Turonian. Coverage of the external margin of the drowned Urgonian platform by a drape of pelagic carbonates started only in the Late Turonian. During the Santonian, the external part of the drowned platform underwent normal faulting and saw the re-exposure of already lithified Urgonian carbonates at the seafloor.

Based on the here-inferred ages, the first drowning phase just precedes oceanic anoxic episode 1a (OAE 1a or “selli event”) in time, and the second drowning phase partly overlaps with OAE 1a. The onset of the third drowning event slightly predates two further periods of increased organic-matter accumulation in the Vocontian Basin (Noir and Fallot levels), and the onset of the fourth and final drowning phase may coincide with two further periods of increased organic-matter accumulation in the Vocontian Basin (Jacob and Kilian levels, part of OAE 1b). These correlations indicate a relationship between the so-called anoxic episodes and the stepwise demise of the Urgonian platform, even if the onset of environmental change is registered earlier on the platform than in basinal sediments.     

Facies architecture and cyclicity in a mosaic carbonate platform: effects of fault-block tectonics (Lower Lias, Causses platform, south-east France)

In the Causses platform (south‐east France), Late Hettangian to Sinemurian deposits were interpreted previously as shallow‐water carbonate ramp deposits. A new look at these deposits has shown a fault‐controlled mosaic carbonate platform that is different from the carbonate ramp models. Within the platform mosaic, 15 lithofacies have been recognized, which are organized in four facies associations, including peritidal, restricted shallow sub‐tidal, sand dunes and sub‐tidal shelf facies associations. The rapid lateral and vertical facies changes, and the lack of consistent landward or seaward direction indicated by the pattern of facies changes, question the existence of a shoreline suggested by the traditional models for this region. Instead, the facies organization and cycle stacking pattern suggest deposition in a mosaic of intertidal islands between which sub‐tidal restricted or open conditions could coexist in very close proximity. Such a platform mosaic would have been defined by tectonic activities along normal faults which segmented the shallow‐water Causses platform. The facies and facies associations are arranged into metre‐scale, peritidal and sub‐tidal cycles that are also variable. Certain cycles show the same stacking pattern in all the sections and seem to be traceable over tens of kilometres. On the contrary, other cycles cannot be correlated; they are present only in specific sections and have a maximum lateral extension of 1 or 2 km. These metre‐scale cycles stack to form four medium‐scale cycles bounded by surfaces that display sub‐aerial exposure features. Medium‐scale cycles stack into two larger‐scale cycles (tens of metres thick) and are bounded by well‐defined karstic surfaces. Based on their lateral continuity and their stacking pattern, the metre‐scale cycles are controlled probably by high frequency eustatic variations overprinting the topographic irregularities formed by differential subsidence of fault‐bounded blocks. Episodic fault activities may reorganize the topography so that, even if eustatic changes may still be the major control of cycles, the expression and number of cycles could be different. Cycles of medium and large‐scale are interpreted as being allogenic, controlled by changes in eustasy and/or subsidence rates as evidenced by their lateral continuity and the correlations of the large‐scale cycles with third‐order depositional sequences.     

微信公众平台及移动位置服务的旅游应用模式

针对传统旅游服务模式存在信息获取被动、信息更新滞后、影响了用户体验的问题,探究了基于微信公众平台的旅游应用服务模式,并基于HTML+Eclipse+Tomcat完成了校园旅游服务应用的开发。该公众号能够为游客提供多种GIS基本功能,包括地图浏览、地图搜索和路径查询功能等,同时还可以根据用户所在位置主动提示距离用户最近的3家餐厅及相关信息。通过问卷调研发现,该服务能够基本满足用户需求,为用户带来了良好的旅游体验。     

基于天地图的省级市场主体信息服务系统设计与实现

针对省级市场主体信息的管理和服务需求,基于天地图平台,设计并实现了省级市场主体信息服务系统。通过市场主体空间信息采集与匹配,基于电子地图的分类别分区域展示,查询定位、统计分析,为政府宏观决策、产业发展、工商管理、企业及个人提供了直观、便捷的市场主体信息服务与应用。     

使用多源数据的不动产登记基础平台

针对不动产统一登记平台建设问题,该文以江西省,不动产登记平台建设为例从多源不动产登记信息数据的整合、不动产统一登记平台设计与实现两个方面开展。对土地、房产、草原、林地、海域等多行业的数据进行整理、整合,形成统一的不动产登记数据库。平台总体框架由基础保障系统、不动产历史数据库、共享服务平台、数据管理平台、政务基础平台、登记信息管理平台、登记信息公示平台7部分组成。     

航空重力测量中水平加速度改正的计算与频域分析

基于扰动水平加速度的正弦运动模型，对平台失准角和水平加速度改正的频谱特性进行了分析。利用某航空重力测量试验的实测数据，计算了平台失准角和水平加速度改正。     

小尺度的碳酸盐岩层序地层学分析——塔里木盆地桑塔木断垒带奥陶系层序地层学研究

层序地层学理论现已日臻完善，位人们往往被局限在大范围、大尺度的研究领域中，包括整个盆地或整个陆架的粗线条描述。那么，小尺度（小范围和次级层序）内的层序格式和沉积样式又是如何的呢？本文将作一阐述。在地层学、沉积学的研究基础上，在区域层序地层学的框架下，将桑塔木断垒带这样一个盆地内的三级局部构造的奥陶系进行层序地层学解剖。由于地震资料分辨率的限制，采用大量的钻井录井资料（岩心、电测等），通过岩性、古生物等特征标志建立相对水深变化曲线，以此来对比划分层序。得出，奥陶系内存在一个Ⅰ类层序界面，并将其划分为两个四级层序及相应的五级层序。其中，高水位体系域为最佳储层带。其研究方法和结论在对其他局部构造的研究中可起到类比作用     

不同原子化方法对样品气化速率的影响

本文研究了石墨炉原子吸收分析中管壁、平台和探针原子化测量Cd、Pb、Mn、Co、Cu和Cr的吸收信号特征。结果表明,吸收信号形状由被测元素的性质、样品气化速率和原子蒸气扩散速率决定。对于同一元素,在选定仪器条件下,峰形主要由样品气化速率决定。而样品气化速率又与原子化表面的升温速率有关。三种原子化方法中,探针的升温速率最快,得到较窄的信号峰,平台的升温速率最慢,峰形较宽。在提高样品气化速率方面,探针原子化是最理想的方法。     

塔里木地台的东部边界问题

本文依据航磁资料，对塔里木地台东部罗布泊地区及其外围的磁场特征，以及基底岩相构造进行了分析，进一步阐述了该区的构造特征。文中根据强磁性基底所反映前寒武纪塔里木中央纬向升高异常带的向东延伸情况，指出塔里木地台向东延伸止于东经91°30′附近，继而为反映褶皱带的弱磁场所取代。据此，文中进一步推测塔里木地台与华北地台自古生代至今可能是不相连的。