甘肃敦煌地区太古宙孔兹岩系特征

本文根据甘肃敦煌地区广泛出露在太古宙TTG杂岩中的一套副变质岩系的岩石组合、典型矿物组合、变质相特征和岩石化学特征的分析,认为它们是一套中深变质的碎屑岩-泥质岩-泥灰岩-碳酸盐建造,其中夹有少量的变质基性火山岩。原岩形成于具有基性火山作用的活动大陆边缘滨海-浅海环境。经过太古宙的区域高角闪岩相变质作用,形成孔兹岩系。     

直达波法测定整板基础砼强度

本文以某工程为例,介绍了直达波法测定整板基础砼强度的技术方法;其结果可避免以往回弹法测量结果离散度较大而引起的争议。     

Synthesis, Characterization and Antibacterial Activity of New Ln（Ⅲ ） Complexes with an Unsymmetrical Schiff Base Ligand

1Introduction SomeSchiffbasecomplexesderivedfromaminoacidsareparticularlyactiveinbiologycatalysisandmaterial.Thestudyofthemisfocusofthestudyof coordinationchemistry.Recently,studiesofsuchmetalcomplexesofmono Schiffbaseshavebeenre ported(Fanetal.,2003a,b;L…     

Excess commuting in transitional urban China: A case study of Guangzhou

During the reform era, Chinese cities witnessed dramatic institutional transformation and spatial restructuring in general and profound change of commuting patterns in particular. Using household surveys collected in Guangzhou, China, in 2001, 2005 and 2010, excess commuting measurements are estimated. Excess commuting shows an overall trend of increasing during 1990–1999, and then declining during 2000–2010. We argue that deepening marketization of the jobs and housing sectors has induced spatial separation of jobs and housing. In other words, institutional transition and urban spatial restructuring are underpinning the changes of commuting patterns in Chinese cities. Excess commuting has strong relationship with individual socio-demographic status, which is by and large due to the increasing flexibilities of jobs and housing location choices enjoyed by urban residents. The findings call for considerations on balancing jobs-housing in making public policies relevant to urban development in general, and land use and transportation in particular.     

Secular period decreasing of detached chromospherically active binaries

The long-term orbital period changes of a large sample of detached chromospherically active binaries (CABs) were studied. Eleven such systems were found to be undergoing secular period decreases with the rates of ?6.3×10^?9 to ?1.1×10^?6 days per year. The period decreasing rates are found to vary depending on the orbital period. The longer the orbital period is, the more rapidly the period decreases. Following Stepien (Mon. Not. R. Astron. Soc. 274:1019, 1995), the period decreasing rate predicted by angular momentum loss (AML) caused by magnetic wind is computed for each system. A comparison between the observed and calculated period decreasing rates shows that the former values are obviously larger than the latter by 1–3 orders of magnitude. It suggests that the magnetic wind is not likely the determinant mechanism driving the AML in these systems. Finally, the orbital angular momentum (AM) and the rate of AML, $\dot{J}$ , are computed for each system. It shows that the AM have a similar change with the orbital period like dP/dt does, but $\log\dot{J}/J$ presents no strict changing with the kinematical ages.     

西藏墨竹工卡县洞中拉铅锌矿床花岗斑岩锆石SHRIMP U-Pb定年

洞中拉铅锌矿床是念青唐古拉山地区扎雪—亚贵拉成矿带内新发现的矿床,矿区出露的花岗斑岩侵入体与洞中拉铅锌多金属矿床的形成密切相关。为精确限定其形成时代,笔者对洞中花岗斑岩进行单颗粒锆石SHRIMPU-Pb定年,结果显示其206Pb/238U加权平均年龄为(124.4±1.9)Ma(MSWD=5.09),该年龄对应于冈底斯—念青唐古拉火山岩浆岩带东段的早白垩世岩浆活动事件(介于109~130Ma),与扎雪—金达铅锌多金属矿成矿带内出露的花岗类岩体年龄(120~130Ma)一致。结合区域资料,洞中拉花岗斑岩是早白垩世弧间裂谷伸展作用下地壳挤压增厚局部熔融的产物。为念青唐古拉地区早白垩世岩浆侵位活动以及铅锌铜钼多金属矿产找矿方向研究提供了重要证据。     

西藏邦铺大型斑岩钼-铜矿床二长花岗斑岩锆石SHRIMP定年及其地质意义

利用锆石U-Pb SHRI MP定年技术,测定了西藏冈底斯斑岩铜矿带东段邦铺斑岩钼铜矿床中二长花岗斑岩的年龄,获得该含矿岩体真实侵位年龄为13.9±0.3 Ma(MSWD=3.05),属于喜马拉雅晚期。邦铺二长花岗斑岩的形成时代介于冈底斯成矿带后碰撞期伸展构造环境的斑岩体的形成时代(12~18 Ma),该年龄的厘定进一步丰富了冈底斯带岩浆活动,并为整个冈底斯成矿带岩浆岩演化历史提供年代学数据和新的启示:可以认为其与冈底斯斑岩铜矿带具有相同的动力学背景,同属于大规模的快速爆发成矿作用过程。     

空三加密在数字摄影测量中的精度分析

该文结合章丘市1∶2000地形图绘制项目的具体实践,认为航空摄影测量产品误差来源主要为空三加密这一重要工序,影响空三加密精度的因素主要为：影像质量（分辨率、清晰度、重叠度）、像控点选取及精度、加密点的选取及加密解算方法、加密人员的经验等。找出影响空三加密精度的主要因素及解决办法,结合生产实践解决了1∶2000地形图绘制空三加密精度问题。     

河北南部峰峰煤田山西组沉积特征与沉积环境演化

通过研究峰峰煤田山西组岩性和沉积构造特征,将山西组划分为四个沉积旋回,根据沉积环境的演化,分析了其对成煤作用的影响,认为区内山西组为典型的河控浅水三角洲沉积,该沉积体系中的聚煤作用较强,尤其是分流间洼地持续发展的部位形成了较厚煤层,由于分流河道的迁移作用,煤层分叉现象,而且成煤后遭河道冲刷导致变薄或缺失。     

Tide-induced Lagrangian residual velocity and dynamic analysis based on field observations in the inner Xiangshan Bay,China

In the Xiangshan Bay at the east coast of China, coastal marine pollution is conspicuous and severe in recent years. As transport of the pollutants is closely related to the coastal circulation, there is a great practical significance to investigate the circulation in this area. In this work, the surface pattern and vertical profiles of Lagrangian residual velocity (LRV) were studied based on field observation data from the inner Xiangshan Bay. By tracking GPS-GPRS drifters’ trajectories, the surface LRV pattern is going out in the central deep trough and flowing inwards near the shoreside. Combined with data from two mooring stations, vertical profiles of LRV is flowing out at surface and flowing in at the bottom, consistent with the gravitational circulation induced by baroclinic effects at the estuary. However, according to the diagnostic analysis, the main mechanism driving the residual current is barotropic rather than baroclinic. The LRV equation is controlled by the tidally-averaged barotropic pressure gradient force, tidal body force and tidally-averaged turbulent stress, while the tidally-averaged baroclinic pressure gradient force is one order of magnitude less than other forces. Additionally, the tidally mean eddy viscosity coefficient which is used in the expression of tidally-averaged turbulent stress might be not adequate and requires further studies.