SHRIMP U-Pb Dating of Zircons of a Dark Eclogite and aGarnet-bearing Gneissic Granitic Rock from Bixiling, EasternDabie Area, Anhui Province: Isotope Chronological Evidenceof Neoproterozoic UHP Metamorphism

The paper reports SHRIMP U-Pb zircon data of a dark eclogite and a post-eclogite garnet-bearing gneissic granitic rock from the Bixiling area, Yuexi County, Anhui Province, in the eastern Dabie Mountains. The eclogite, which is metamorphosed basic tuff, contains very scarce zircons in omphacite or garnet, but more zircons in quartz. They usually exhibit a double-layered texture, as shown clearly in cathodoluminescence images. Their inner main parts give a 206Pb/238U age of 757±7 Ma, representing the approximate age of the high-pressure (HP)- ultrahigh-pressure (UHP) metamorphic event during which the eclogite was formed. The outer peripheral parts of the zircons, which have been modified by late-stage fluids, give an age of 223±3 Ma. The granitic rock contains more zircons of anatectic origin found mostly in feldspar and quartz and usually also showing a similar composite texture. The inner main parts of the anatectic zircons with oscillatory zoning give a 206Pb/238U age of 727±15 Ma for the approxim     

Influences of the Basin Brines on Hydrocarbons of the Anthracosia Shales from Southwestern Poland

Previous studies have shown that the oxidizing brines from the Early Permian Rotliegende sequence have influences on the organic matter of Kupferschiefer. However, inside the Rotliegende sequence there are two other black shales: the Lower and Upper Antracosia shales, which have not been studied as much in detail as in Kupferschiefer. In the present study 12 samples from the Lower and Upper Antracosia shales were analyzed by organic geochemical methods in order to clarify the influences of the oxidizing brines on organic matter. The results indicate that the organic matter of the samples from the Upper Antracosia shale and the bottom of the Lower Antracosia shale was oxidized under the influences of the oxidizing brines. The oxidation resulted in a depletion of saturated hydrocarbons and the alky Is of the aromatic compounds.     

Palaeoclihlatic Indicators of China's Quaternary Saline Lake Sediments and Hydrochemistry

In this paper the authors classify saline lake sediments into the cold, warm and eurythermal phases, reveal the consistency between the zoning of hydrochemical types of modern saline lake water and climatic zoning and give climatic parameters under the conditions of typical cold phase (mirabilite and natron), warm phase (thenar-dite) and slightly warm phase (bloedite) saline lake deposition.     

长江口北支沉积物粒度特征与沉积环境

长江口北支为喇叭口型中潮河口,在径流－潮流共同作用下,塑造了典型的心滩、边滩、沙嘴、潮流脊和潮汐汊道等地貌形态。本文根据所采集的长江口北支底质的粒度分析结果,利用数字地质方法对粒度参数进行对应分析;并在此基础上分析北支的沉积特征及沉积环境,揭示其沉积作用的动力机制。     

准噶尔盆地南缘中段异常压力分布及影响因素

准噶尔盆地南缘地区盆地演化时间长, 近期构造活动剧烈, 构造应力场复杂, 地层异常压力高且分布极不规律, 对构造的形成演化及对油气的成藏过程影响极大.据实测资料和间接估算数据所展示的地层压力分布特征, 分析了砂砾岩地层和泥岩地层在压力成因和分布等方面的差异, 从不同渗透性地层内压力形成的机制和分布特征的角度讨论了控制和影响现今压力分布的地质因素.准噶尔盆地南缘存在的极高地层压力是在压实作用、构造挤压作用所形成的地层高压背景下, 叠加了近期因断裂活动和背斜构造快速形成所引起的他源高压而形成的.沉积相带分布、压实作用、构造应力、地层的形变和断裂的活动过程等都明显地影响了压力的演化和分布.      

非饱和土中溶质迁移参数反演的HISR方法

以非饱和土中溶质迁移参数反演问题为背景, 依据正则化方法的思路, 以Itakura Saito距离作为同伦函数中的平凡问题, 将同伦方法引入非线性参数反演问题的求解, 进而提出一种求解非线性参数反演问题的大范围收敛(HomotoyItakura SaitoRegularization, HISR) 方法.为保证迭代稳定性, 并同时削弱观测噪声的影响, 同伦参数的修正采用了连续化修正方法.本文将HISR方法应用于求解带有平衡及非平衡吸附效应的一维非饱和土中溶质迁移参数反演问题, 计算结果表明HISR方法具有大范围收敛性及计算稳健性, 同时有较强的抵抗观测噪声的能力.      

塔里木盆地塔中低凸起奥陶纪油气成藏体系

国外含油气系统的概念和方法在国内的含油气盆地研究中的应用存在着局限, 应用油气成藏体系的理论方法对塔中低凸起奥陶系油气成藏过程进行了分析.塔中低凸起奥陶纪油气成藏体系的源岩为寒武系及下奥陶统烃源岩; 满加尔坳陷中的砂体和不整合面是油气侧向运移的输导体, 同时深部断裂是油气垂向运移的输导体; 圈闭类型主要为古隆起背景上的地层型圈闭和构造型圈闭.塔中Ⅰ号断裂构造带是最为有利的油气聚集区, 塔中北坡次之, 中央断垒带最差.塔中Ⅰ号断裂带依然是下一步勘探的重中之重.      

省级"数字林业"系统模型研究

根据数字林业的基本思想,分析了我国林业信息化建设的基础与存在问题,探讨了省级"数字林业"建设的原则.从软、硬件的选择、系统的架构、系统的主要功能入手,提出一个典型的省级"数字林业"系统模型及其建设内容与目标.最后还就数字林业信息系统的关键技术进行了讨论.     

Autumn intensification of the Ryukyu Current during 2003-2007

Inverse calculations using data from 16 repeat hydrographic transects collected from April 2003 to June 2007 have yielded velocity structures and volume transports(VTs) of the Ryukyu Current in the region east of the northern Ryukyu Islands.The inverse calculation results show that the Ryukyu Current is dominated by a subsurface velocity core with maximum velocities from 15.1 to 80.0 cm/s,whose positions vary between 110 and 600 dbar and 27.2°-28.2°N along the transect.The mean velocity exhibits a subsurface velocity core with a maximum value of 24.6 cm/s at 326 dbar depth,a VT of 14.0 Sv(1 Sv≡106 m3/s),a vertical dimension of 800 m,and a horizontal dimension of 60 km.The seasonal mean velocities show that the Ryukyu Current is stronger in autumn than in other seasons.It is suggested that this seasonal variation is coincident with the intensification of the anticyclonic eddy south of Shikoku,Japan.     

多模全球导航卫星系统融合精密定轨

基于武汉大学自主研制的卫星导航系统综合处理软件(PANDA),利用全球实测的GPS/GLONASS、GPS/Gali-leo试验卫星(GIOVE)多模接收机数据进行GPS、GLONASS、GIOVE卫星的融合精密定轨理论与方法研究。通过与IGS提供的GPS与GLONASS卫星精密轨道比较、轨道重叠弧段互差以及SLR观测数据检核等多种方法对融合计算的精密轨道精度进行了评定。