闽东北沿海晚第四纪海侵与海面变动

闽东北沿海是福建乃至全国晚第四纪海面变化研究比较薄弱的地区之一。本文根据该区的钻孔岩芯和地表露头沉积相及测年资料的综合分析，揭示了闽东北沿海晚更新世以来的海侵和海面变动；晚更新世约９０－８０ｋａＢＰ，７０－６０ｋａｂ０，４０－３９ｋａＢＰ和３４－２２ｋａＢＰ发生４次海侵；全新世海侵在约１２ｋａＢＰ已开始，此后海面有过多次波动，其中约在距今６ｋａ和３ｋａ前出现过明显高于现今海面位置的高海面，海侵范围     

晚更新世末期东亚季风活动与陆架区沉积环境变迁

从距今18000年的最后冰期最盛时期到距今10000年开始的全新世海侵,全球气候发生过急剧的变化。位于亚洲东部的古季风活动也经历了盛衰变化。大量的钻孔及浅地层剖面分析资料已经证实,冰期最盛时期陆架区古季风活动加强,陆架出现了沙漠环境与黄土沉积。当冰期结束,气候转暖,冬季风减弱之际,南黄海陆架及长江三角洲一带的沙漠与黄土分布范围也随之缩小,原先的沙漠活动区变成了黄土分布区,也就是所谓硬粘土沉积区。随着古季风活动的进一步衰退和海面的不断升高,来自陆架区的东北风变为冷湿气流。长江三角洲地区和陆架上出现了有利于沼泽发育的环境,全新世海侵把泥炭层淹没。陆架区晚更新世末期以来的地层中出现沙层、硬粘土和泥炭层的沉积序列,即“三元沉积结构”,是古季风盛衰过程的最好记录。     

湄洲岛海岸地貌特征及成因研究

湄洲岛海岸地貌的发育受海洋动力和断层活动双重控制。东部以海岸侵蚀为主,形成海蚀崖、海蚀平台、海蚀壕沟等地貌,在岬角间,形成海滩堆积;西部以堆积为主,形成淤泥质海滩,海蚀作用相对比东部弱。东峤断裂控制了台地和丘陵的分布,断裂东盘抬升形成丘陵,西盘下降形成台地。受北西—南东走向的仙游—郊尾断层左行运动影响,湄洲岛北部向西移动,南部向东移动,使岛的轮廓呈＂S＂形态。福建沿海在距今0.7—0.6万年前发生海侵时,湄洲岛处于断块抬升环境,就岛的局地范围,处于低海面;在0.4—0.3万年前福建沿海海侵达到高峰时,湄洲岛的海侵经历了两个阶段,第一阶段为水动型海侵,第二阶段为地动型海侵。     

湖南天门山牛蹄塘组底部沉积环境分析

通过实地考察湖南张家界(大庸)天门山一带寒武系牛蹄塘组底部的岩性、结构及化石,并结合地球化学指标来探讨牛蹄塘组底部的沉积环境.牛蹄塘组的岩性自下而上为:磷块岩或硅质岩-磷结核层或砾岩-硅质页岩或泥灰岩-矿层-碳质页岩;含他形结构重晶石的层位与贵州、湖南等地喷流沉积成因重晶石矿床的层位一致.页岩的LaN/CeN比值为1.27,Ce/Ce*比值为0.87,属于大陆边缘的范围;而硅质岩的LaN/CeN是3.19,Ce/Ce*为0.33,则不属于正常大陆边缘的比值范围.硅质岩与页岩的Ua(Ua=Utotal-Th/3)分别为4.53及63.54.牛蹄塘组底部是大陆边缘陆棚到陆架的沉积环境,为一个海侵的过程.其地化环境从富氧到缺氧,期间经历了至少两次的热液活动.     

试析环境演变对史前人类文明发展的影响--以长江三角洲南部平原良渚古文化衰变为例

良渚先民受自然环境的制约和经济生活模式的决定,连片成串地集中分布于长江三角洲南部平原,良渚早中期的温干气候和适宜环境使良渚文化空前繁荣,但在距今4000年左右突然消亡.作者通过研究,发现在距今4100年左右存在明显的降温事件,降温使农作物歉收,食物匮乏,在部落间引起连绵战争,使良渚文化走向衰弱.而距今3600年左右的海平面升高,在长江三角洲南部平原发生沟谷海侵,地下水位升高,太湖湖泊体系迅速扩张,引起大洪水,导致良渚文化消亡.     

第四纪时期海平面变化与我国海岸线变迁的探讨

引言第四纪时期,我国海岸发育的过程是相当复杂的。海岸构造局格始于中生代的燕山运动和第三纪的喜马拉雅运动,而现代海岸线的外貌,则经历了第四纪的海陆变迁,直至距今6,000年左右才逐渐形成的。更新世全球性气候出现多次冷暖交替,相应地发生了几次冰期与间冰期更替,导致冰川型海面升降,冰期时海面下降,发生海退,间冰期时海面回升,则发生海侵。与此同时,海洋底部     

宁夏贺兰山地区奥陶纪地层沉积环境演化规律探讨

贺兰山地区奥陶纪地层发育良好，特征显著。依据形成时间，其岩石地层序列自下而上划分为马家沟组，米钵山组2个组级岩石地层单位；出露于贺兰山中一南段，隶属华北西缘地层分区和祁连一北秦岭地层分区。笔者认为奥陶纪初期，海侵进一步扩大，海侵范围几乎含盖整个本区，形成了以碳酸岩盐为主的台地相沉积。后期沉积环境发生了明显变化，以碎屑岩，泥岩为主夹薄层灰岩，砾屑灰岩，角砾岩，属次深海大陆斜坡沉积。从岩石地层．地层层序，沉积相及沉积环境相演化序列总体看来，反映了一个海侵沉积序列演化规律。     

第四纪时期海平面变化与我国海岸线变迁的探讨

引言第四纪时期,我国海岸发育的过程是相当复杂的。海岸构造局格始于中生代的燕山运动和第三纪的喜马拉雅运动,而现代海岸线的外貌,则经历了第四纪的海陆变迁,直至距今6,000年左右才逐渐形成的。更新世全球性气候出现多次冷暖交替,相应地发生了几次冰期与间冰期更替,导致冰川型海面升降,冰期时海面下降,发生海退,间冰期时海面回升,则发生海侵。与此同时,海洋底部     

全新世河口三角洲形成发展的若干问题——以珠江河口三角洲为例

以珠江河口三角洲为例,论述了三角洲的概念和范围、全新世海侵最大时的古海岸位置与海水入侵范围、全新世海侵结束后三角洲发展和环境变化特点及其与古代人类活动遗迹分布的关系,并对珠江三角洲的模式问题进行讨论.     

南流江三角洲沉积特征及其环境演变

南流江三角洲钻孔记录揭示，三角洲全新世沉积陆上部分有三角洲平原相、三角洲前缘相、前三角洲—浅海相、河床相依次迭覆的特征，水下部分有三角洲前缘相、前三角洲─—浅海相、河床相依次迭覆的特征。该三角洲大体经历了全新世早期─—海侵阶段、全新世中期─—稳定阶段和全新世中晚期─—海退阶段。南流江主河道自明代初（距今约６００年）开始，从东部周江逐渐向西部变迁至七星岛附近入海。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-