塔里木南缘布雅花岗岩和暗色包体的锆石U-Pb年代学及地球化学特征

塔里木西南缘铁克里克地区广泛发育早古生代中酸性侵入岩,本文对其中布雅岩体及其暗色包体进行系统的岩石学、年代学及岩石地球化学研究,确定了岩石成因及其构造属性。LA-MC-ICP-MS锆石U-Pb年代学研究表明,寄主石英二长闪长岩结晶年龄为432.6±2.5 Ma(MSWD=1.5),暗色包体结晶年龄为432.4±6.4 Ma(MSWD=0.031),二者形成时代相同,均为志留纪早期岩浆活动的产物。地球化学特征表明,布雅暗色包体应来源于地幔的部分熔融,而寄主岩石岩浆具有壳源岩浆的性质并经历了幔源岩浆不均匀的混合。野外及岩相学特征均显示暗色包体为铁镁质岩浆注入长英质岩浆快速冷凝形成的,是幔源岩浆底侵下地壳形成的岩浆混合作用的产物。它们是塔里木南缘早古生代碰撞造山作用晚期的岩浆记录。     

元坝长兴组超深层生物礁大气田优质储层发育机理

通过系统开展元坝气田长兴组超深层生物礁储层岩石学与岩石地球化学分析,结合碳酸盐岩溶蚀动力学模拟实验,以及储层古压力恢复,揭示了元坝超深层生物礁优质储层的发育保存机理。研究表明,早期暴露溶蚀、浅埋藏白云岩化是基质孔隙发育的基础,储层深埋引起的古油藏原油裂解导致的超压水力破裂缝的形成,是储层渗透性改善的关键,"孔-缝耦合"共同控制了超深层优质储层的发育。在此基础上,构建了生物礁非均质"孔-缝双元结构"储层模型,为生物礁储层预测奠定了理论基础。     

大运河环境景观与变化分析

基于第一次地理国情普查成果,结合高分辨率遥感影像、遗产保护区划图、遗产要素统计信息,获取、分析了大运河申遗之前(2009年为主)、申遗成功当年(2014年)、申遗成功一年之后(2015年)三个时点的环境景观及变化信息,为大运河调查、评估、规划、管理、监测提供理论和地理信息支撑.通过本研究探索,对地理国情普查成果有效转化应用起到很好的示范作用,并为其他世界文化遗产和不可移动文物监测提供了有效借鉴.     

淮北煤田卧龙煤矿岩浆侵入煤层的构造控制

岩浆侵入对煤矿生产影响极大,淮北煤田卧龙煤矿是受岩浆侵入较严重的矿井之一,其地质构造是控制岩浆侵入和岩浆岩展布的重要因素。基于对岩浆侵入前的地质构造和构造应力场的深入研究,通过从区域构造到井下小构造逐级分析其对岩浆侵入的控制,阐明了研究区构造控制下的岩浆侵入规律。结果表明,NNE向的F7和F5断层控制了岩浆的侵入方向,并与和其交汇的      

用GPS位移场进行中小区域变形分析方法探讨

因局部区域相对全球框架不可避免地存在整体刚性平动分量,常影响对局部范围内地壳相对变形量级与特征的判读.对分离局部整体刚性平动分量的方法进行了探讨,通过实例分析认为,对京津地区28个GPS连续观测站给出的位移速率场,整体平移法和欧拉矢量法都能得到较好的效果,但相比之下,对于类似的中小区域,整体平移法更加简单明了.     

呼中区白浪河铅锌矿普查区地质地球物理与地球化学特征

本区大地构造位置处在大兴安岭中生代火山岩区北部与额尔古纳地块额木尔中间隆起带接壤部位,得尔布干断裂带南东端。     

渠坡上基桩的水平承载机制试验研究

南水北调中线工程建设中,交通桥和生产桥的支承结构大部分坐落在两侧渠坡上;运行期间的荷载（特别是水平荷载）通过桥墩和承台传到置于渠坡的桩基础上,在一定的深度范围内将产生桩、土分离及不均匀沉降,拉裂基础与渠坡结构层的结合,影响渠道的防渗效果。为了采取有效的防治措施,需要掌握渠坡斜面上基桩的变形机制。作为研究环节之一,通过物理模型试验研究了渠坡上基桩的水平承载机制,结果表明：基桩处在渠坡上的抗变形能力要比处在水平地基上的抗变形能力弱,水平承载能力比基桩处在水平地基上的要小。     

辽河三角洲地貌演化(英文)

This paper mainly analyzes the geomorphological changes of the tidal deposition in the Liaohe Estuary based on the multi-year bathymetric charts in 1990, 1996, 2002 and 2005 and Landsat TM images in 1987, 1994, 2002 and 2005. Evolution of the tidal depositional system during the past 20 years in the Liaohe River was studied on the basis of 50 boreholes drilling and 30 km shallow stratigraphic exploration from 2002 to 2005. The main tidal depositional body of the modern Liaohe River delta is located in the Shuangtaizihe Estuary. The stratum within the depth of 10 m includes tidal bank facies, tidal channel facies and neritic facies with paleo-delta facies underlying them. The sediments of tidal bank facies are mainly composed of sand and silt with siltation load and suspended load of about 50% respectively in proportion. The sediment of tidal channel facies and neritic facies is composed of clayey silt and silty clay which belongs to suspended load. The study area was a small bay between the old Daliaohe River, the old Dalinghe River and the Raoyanghe River complex delta since the Holocene to 1896. Many tidal banks formed and expanded rapidly after the Shuangtaizihe River was excavated by labor in 1896. The runoff and sediment discharge have decreased since the construction of brake at the Shuangtaizihe River in 1958.The Shuangtaizihe Estuary is in the state of deposition as a whole whose tidal bank is increasing and expanding southward, westward and northward. The maximum expansion speed is 87 to 683 m/a and the mean depositional rate is 0.189 m/a. Erosion occurred in some part of tidal bank with average erosional rate of 0.122 m/a. The tidal channel was filled up with sediment at a migration speed of 48–200 m/a. Geomorphologic changes have happened under the combined influences of runoff, ocean dynamics and human activities. The main source of sediment changes from river sediment to sediment driven by tidal current and longshore current.     

地电场布极方式研究

针对南京地震台地电场无斜道测量的布极方式,从地电场的矢量特性着手,经过对观测数据的分析,认为目前普遍采用地电场斜道观测的方式可以取消,增加NS测道和EW测道的测量,加大地震前兆数据的采集,为地震预报提供更多的前兆观测数据。     

Analysis of expressed sequence tags from the Ulva prolifera (Chlorophyta)

In 2008,a green tide broke out before the sailing competition of the 29th Olympic Games in Qingdao.The causative species was determined to be Enteromorpha prolifera (Ulva prolifera O.F.Müller),a familiar green macroalga along the coastline of China.Rapid accumulation of a large biomass of floating U.prolifera prompted research on different aspects of this species.In this study,we constructed a nonnormalized cDNA library from the thalli of U.prolifera and acquired 10 072 high-quality expressed sequence tags ...