Linking the Sulu UHP belt to the Korean Peninsula: Evidence from eclogite, Precambrian basement, and Paleozoic sedimentary basins

Considerable debate on whether and how the Sulu Orogenic Belt extends eastward to the Korean Peninsula has remained over the past decade. New results reported here include the following: (1) an eclogite and retrograded eclogite-bearing complex (Hongseong Complex) is discovered in South Korea, in which the eclogite occurs as lenses in circa  810–820 Ma granitic gneiss. SHRIMP zircon dating of the eclogite yields  230 Ma for the metamorphic age and  880 Ma for the protolith age; (2) The basement of the Rangnim, Gyeonggi and Yeongnam massifs have affinities to the basement of the North China Block (NCB). However the Gyeonggi Massif encloses a minor amount of large or small slabs of the Hongseong Complex that are similar to the rocks of the Sulu Belt. (3) Two main Paleozoic basins within the Rangnim and Gyeonggi massifs have a similar Paleozoic tectono-stratigraphy to the NCB. (4) The Imjingang and Ogcheon belts do not exhibit any metamorphic characteristics of collisional orogenic belts. Based on these facts, we propose a crustal-detachment and thrust model and suggest that the collision belt between the Yangtze Block (YB) and NCB (Sino–Korea Craton) is preserved along the western margin of the Korean Peninsula. The lower part of the UHP metamorphosed lithosphere of the YB was subducted under the Korean Peninsula and not uplifted to the surface. The lower crust of the YB (the Hongseong Complex) was detached from the subducted lithosphere and thrust over the Korean Peninsula, and inserted into the basement rocks of the Gyeonggi Massif. The upper crust of the YB possibly was detached from the lower crust and overthrusted along the Honam and Chugaryong shear zones. The Imjingang and Ogcheon belts possibly represent the detached upper crust of YB and their present occurrences are controlled by a Mesozoic strike–slip shear structure. All these detached lower and upper crustal slabs were strongly deformed during the Late Jurassic and Early Cretaceous tectonic event leading to their present geological distribution and characteristics.     

Experiments on the primary migration of oil from source rocks

Simulation experiments on the primary migration of oil were carried out on massive samples. The results proved that oil generated from source rocks was expelled in the form of an independent oil phase. High oil-expulsion efficiency was observed. It follows that the primary migration of oil is not directly dependent on the quantity of oil generated from the source rocks. Therefore, the oil-expulsion proportion was high though some source rocks yielded only a limited amount of oil. A great deal of gas was produced at the same time of oil-generation. Thus, it can be concluded that the main expulsion energy for oil primary migration came from these gases.     

地震活动热红外异常的影响因素分析

对地表热红外辐射的基础理论和各类地物的热红外辐射特性进行了简略介绍;对地形地貌、地物类型和气象等非震因素对地表热红外辐射的影响及地表热红外亮温的时空变化特征进行了详细的分析;对各类非震因素的去除方法进行了探讨。初步认为,充分研究活动构造区带在各类非震因素影响下的热红外影像特征,掌握无震条件下的红外亮温时空演化过程,建立红外亮温变化的基准模型及各类非震因素的扣除模型,将有可能较好地排除非震因素的影响,检测出与地震活动有关的热异常。     

Ternary geochemical-tracing system in natural gas accumulation

The establishment of geochemical-tracing system of gas generation and accumulation is helpful to re-elucidating the gas migration and accumulation in time and space. To deduce the complex process of gas accumulation, a ternary geochemical-tracing system is set up, according to stable isotope inheritance of source rocks, kinetic fractionation of stable isotopes, time-accumulating effect of noble gas isotopes, mantle-derived volatile inheritance, and organic molecule inheritance of light hydrocarbons and thermally kinetic fractionation in their generation, in combination with the previous achievements of gas geochemistry and geochemical parameters of gas-source correlation. There are tight interactions for the geochemical parameters with much information about parent inheritance and special biomarkers, in which they are confirmed each other, reciprocally associated and preferentially used for the requirement so that we can use these geochemical parameters to effectively demonstrate the sources of natural gas, sedimentary environments and thermal evolution of source rocks, migration and accumulation of natural gas, and rearrangement of natural gas reservoirs. It is necessary for the ternary geochemical-tracing system to predict the formation of high efficient gas reservoir and their distribution in time and space.     

乌鲁木齐河流域地下水水位监测网设计

文章阐述了乌鲁木齐河流域区域地下水水位监测网的优化设计。基于ARCGIS技术,运用水文地质学方法在叠加合成地下水动态类型分区图的基础上优化设计了区域地下水水位监测网密度;采用时间序列分析方法确定了地下水水位监测频率。首期施工安装了11个新的长期专门监测孔;对73个现有监测孔进行了维修并安装了孔口保护装置,安装了28套水位自动监测仪,初步实现了地下水水位的自动监测。     

GDX-502树脂富集高效液相色谱法测定地表水中酚类化合物

采用自制GDX-502固相萃取小柱萃取水中苯酚、对硝基酚、间甲酚、2，4-二氯酚、2，4，6-三氯酚、五氯酚等6种酚类化合物，以乙腈作为洗脱剂，选择280nm和290nm双波长紫外高效液相色谱进行检测。结果表明，方法检出限为0．01-0．05mg／L，IL水的平均加标回收率为82．5％-95．0％，精密度（RSD，n=7）为3．6％-9．2％。方法用于实际地表水中痕量酚类化合物的检测，操作简单，有机溶剂用量少，分析效率高；萃取小柱可多次重复使用，分析成本低。     

天津蓟县锰方硼石矿床

蓟县锰方硼石矿床发现于1971年,是世界上第一个独立形成矿体的锰方硼石矿床。锰方硼石为白色、浅黄色,是一种稀有矿物。矿床赋存于高于庄组桑树鞍亚组中,在蓟县该矿带东西延长30 km,向北西及南东分别延至平谷及遵化。现已勘探完毕的东水厂矿区,从经济意义上讲,它是最大的锰方硼石矿床。文中在以往研究的基础上对该矿床特征及矿物物理化学性质作进一步的研究。     

西秦岭天水尹道寺中生代酸性火山岩锆石U-Pb定年和元素地球化学研究

对天水尹道寺酸性火山岩进行了LA-ICPMS锆石U-Pb定年、全岩主量和微量元素分析.结果表明,本区酸性火岩熔岩均为流纹岩,SiO2、Na2O K2O含量高,TiO2含量低,主体为亚碱性系列,轻稀土高度富集,Eu负异常明显.微量元素原始地幔标准化分配模式及洋中脊玄武岩标准化分配模式分别与大陆板内火山岩或大陆板内花岗岩的分配模式一致,Ba、Sr、P、Ti显著亏损.锆石U-Pb同位素定年揭示了流纹岩的岩浆结晶年龄为印支末期(211Ma).流纹岩具有富集放射性Pb同位素的特点,其源区可能为北秦岭基底岩石.依据稀土元素和微量元素分配模式对比研究,认为流纹岩浆为地壳下部部分熔融的产物.源区物质可能为下元古界秦岭岩群中的黑云角闪斜长片麻岩,源区的残留物主体可能为斜长石,含有角闪石,岩浆演化过程中存在少量的碱性长石和黑云母的分离结晶.印支末期秦岭地区处于由陆内碰撞造山阶段开始向深部地幔调整和岩石圈减薄阶段转变,特殊的构造背景使得陆内挤压、剪切走滑和推覆构造较为发育,西秦岭尹道寺地区特定的构造背景与断裂构造的结合,形成了该地区独特的流纹岩浆喷发.     

南宁市大气能见度变化特征及影响因子分析

对2000至2006年的南宁市能见度资料进行统计分析。分析表明,南宁市近7a能见度年均值在13～17km之间,总体呈下降趋势。一年之中,能见度最小值主要出现在1至3月,最大值出现在6至7月,汛期能见度明显好于非汛期。一日之中,能见度的日变化为：08时〈02时〈20时〈14时。能见度与气象因子的相关分析表明,能见度与温度、风速成正比,与压强、降水、湿度成反比。与污染物的相关分析表明,能见度与PM10浓度的相关性较强,达到-0.58。     

Java多线程及多点连接技术在WebGIS数据传输中的应用

目前空间数据的传输效率低下已成为制约WebGIS发展的主要瓶颈之一。多线程技术以及多点连接在提高系统吞吐率、有效利用系统资源、改善用户任务之间的通信效率等方面有着显著作用。本文采用地图分层和图面分割的方法以及Java多线程和多点连接技术实现了WebGIS空间数据的高效传输。