冀西北尚义盆地中生代沉积特征及古地理*   总被引：1，自引：0，他引：1       下载免费PDF全文

章朋  柳永清  旷红伟  彭楠  许欢  刘海  徐加林  陈军  王宝红  汪明伟 《古地理学报》2014,16(3):359-376

尚义盆地形成于早侏罗世-早白垩世,盆地内沉积了一套以紫红色、灰绿色陆源碎屑岩为主的地层,仅在晚侏罗世-早白垩世地层局部夹薄层玄武安山质火山岩。通过系统分析尚义盆地的沉积岩、沉积相带展布特征及古水流、砾石成分等,分析了早侏罗世-早白垩世盆地的物源区、汇水中心及古气候的演化,恢复了早侏罗世-早白垩世盆地古地理格局。同时,在前人研究基础上,结合尚义盆地的沉积-充填样式,重点总结和综合分析了盆地内熔积岩、辉绿岩、边界断层等的发育特征,初步推断晚侏罗世-早白垩世尚义盆地为伸展断陷盆地。  相似文献   

采用变系数回归模型提取GPS坐标序列季节性信号     

卢辰龙  匡翠林  戴吾蛟  卢骏 《大地测量与地球动力学》2014,34(5):94-100

提出采用变系数回归模型提取连续GPS坐标序列中包含的振幅时变季节性信号。对模拟数据及实际GPS坐标序列两组数据的分析结果表明,变系数回归模型在提取GPS坐标序列季节信号方面比传统模型更有效。经处理,GPS坐标序列能获得更合理的速度及噪声估计。  相似文献   

准噶尔盆地古隆起的分布与基本特征   总被引：56，自引：16，他引：40  

何登发  翟光明  况军  张义杰  石昕 《地质科学》2005,40(2):248-261,304

准噶尔盆地外侧三大边界动力体系的作用及基底结构的差异性导致准噶尔盆地在不同地质时期发育不同性质的隆起构造。石炭纪晚期东北侧的造山作用形成了盆地北部隆起,晚二叠世北部隆起分异为陆梁隆起与乌伦古坳陷;早二叠世西北侧的造山作用形成了车排子隆起,随后的冲断作用形成了克拉玛依--夏子街断裂带。燕山期的压扭作用形成了沉积盖层中的车排子--莫索湾隆起。新生代北天山向北的冲断作用导致准噶尔盆地南部地区急剧挠曲沉降,盆地向南掀斜,隆起向北迁移。据基底的性质、形成时间、活动方式、地质结构与保存状态等特点将准噶尔盆地的隆起划分为继承型、间断型、掀斜型与冲断带型等4种基本类型。  相似文献   

近千年中国东部夏季降水的模拟研究   总被引：2，自引：2，他引：0       下载免费PDF全文

提汝媛  顾亚进  刘健  况雪源  王红丽 《第四纪研究》2009,29(6):1104-1114

利用ECHO­G海气耦合气候模式模拟的中国东部过去近1000年的降水资料,通过经验正交函数分解方法得到了中国东部夏季降水分布的主要空间型态： 华北和华南地区与长江中下游地区反位相,即华北和华南地区降水多(少)时长江中下游地区降水少(多)。对31年滑动平均后3种空间分布型的时间系数进行Morlet小波分析和功率谱分析发现,3个地区均存在准60年的年代际振荡周期,长江中下游和华南地区均存在准200年的百年际振荡周期,华南地区还存在120年和80年的变化周期。全球海温场与3个地区夏季降水31年滑动平均后的相关分析表明,在40°～70°S,170°～60°W海域海温与华北和长江中下游地区夏季降水负相关,与华南地区夏季降水正相关除该区外的南北半球(30°～60°)中高纬海域海温与华北和长江中下游地区夏季降水正相关、与华南地区夏季降水负相关,说明在年代际和百年际时间尺度上,中高纬海域海温是影响长江中下游地区和华南地区夏季降水反相的主要因子之一。最后通过对太阳常数、火山活动等外强迫因子与中国东部夏季降水的功率谱分析发现： 中国东部夏季降水的年代际与百年际变化周期大都与外强迫因子的变化周期一致,说明外强迫因子,尤其是太阳常数和火山活动的变化是影响中国东部夏季降水年代际和百年际振荡的主要原因。  相似文献   

冰雷达探测研究南极冰盖的进展与展望   总被引：3，自引：0，他引：3  

崔祥斌  孙波  田钢  蒋芸芸  张向培  郭井学  唐学远 《地球科学进展》2009,24(4):392-402

南极冰盖是地球上最大的陆缘冰体,其物质收支和稳定性对全球气候变化和海平面升高有重要的影响。冰雷达,或称无线电回波探测,是冰川学家调查南极冰盖冰下特征的主要方法。在过去的50年里,冰雷达被广泛用于测量冰盖厚度、内部构造和冰下地貌,这些参数是计算冰盖体积和物质平衡、重建过去冰雪积累和消融率以及冰盖动力和沉积过程的基础。现在,冰雷达测量覆盖了南极绝大部分区域,极大地提升了人们对南极冰盖和全球系统间相互作用的理解。首先,简要介绍了冰雷达及其技术发展,然后着重评述了冰雷达在探测研究南极冰盖厚度和冰下地形、内部反射层、冰下湖和冰下水系、冰床粗糙度以及冰晶组构上的进展。最后,对未来冰雷达探测研究南极冰盖的前景进行了展望,并给出我国的现状。
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Mapping QTLs of caudal fin length in common carp (Cyprinus carpio L.)     

C Lu  Y Zhang  X Zheng  X Zhang  C Li  Y Kuang 《新西兰海洋与淡水研究杂志》2013,47(1):96-105

Common carp (Cyprinus carpio L.) exhibits significant morphological variability in the shape and size of the caudal fin. In this study, we used 190 progeny from two F₁ parents to identify and map quantitative trait loci (QTLs) that influence caudal fin length (CFL) and the ratio (RCS) between caudal fin length and standard length (SL) based on a microsatellite genetic map of common carp. A total of 15 QTLs were detected in seven different linkage groups. One significant and eight suggestive QTLs affecting CFL were identified on LG8, LG14, LG29, LG32 and LG44, which explained 8.0%–22.1% of the phenotypic variation; six suggestive QTLs affecting RCS were detected on LG8, LG32, LG46 and LG48, which explained 7.0%–15.4% of the phenotypic variation. The QTLs for caudal fin length detected in this study may serve as a starting point for identification of genes involved in caudal fin development in common carp.  相似文献   

山东沂沭断裂带早白垩世晚期恐龙足迹特征差异性^*   总被引：1，自引：0，他引：1       下载免费PDF全文

彭楠  柳永清  旷红伟  吴清资  刘海  陈军  许欢  徐加林  汪明伟  王宝红  王克柏  陈树清  张艳霞 《古地理学报》2013,15(4):517-528

近些年来,在山东沂沭断裂带南部地区(莒南、临沭、郯城和东海）的下白垩统上部大盛群中发现了大量的恐龙足迹化石,而这些化石反映的足迹类型、形态大小、足迹踩踏深度等方面都存在有差异性。研究发现,在足迹类型方面,莒南地区以兽脚类和鸟脚类恐龙足迹为主,临沭、郯城和东海地区以蜥脚类恐龙足迹为主。足迹大小方面,莒南地区的兽脚类足迹可划分为类型Ⅰ和类型Ⅱ两种类型,而东海地区的恐龙足迹主要属于类型Ⅱ,但是莒南地区大多数足迹的趾间角要小于东海地区的,这可能是由于兽脚类恐龙属种的不同所造成的;莒南地区鸟脚类足迹绝大多数要小于临沭地区的鸟脚类足迹;郯城地区的蜥脚类足迹较小,而莒南、临沭和东海地区大多数蜥脚类足迹的大小较为相似,个别临沭和莒南地区的蜥脚类恐龙足迹较大。足迹踩踏深度方面,临沭、东海和郯城地区的足迹相比莒南地区的足迹要稍深,这与足迹形成在不同湿度、黏度、颗粒度的沉积物表面上有密切联系。基于上述研究认为,在早白垩世晚期,沂沭断裂带内生活着种类繁盛,数量庞大的恐龙动物群,联系到沂沭断裂带东部诸城地区早白垩世早期地层中也发现有大量的以兽脚类为主的恐龙足迹化石,推断在早白垩世,沂沭断裂带及胶莱盆地当时为一个理想的恐龙生存、繁衍的栖息地。同时,山东早白垩世大量恐龙足迹化石的发现也为整个华北甚至东北亚地区晚中生代恐龙属种的分布、演化以及古地理研究提供了丰富的材料和信息。  相似文献   

A numerical study of the barotropic tides and tidal energy distribution in the Indonesian seas with the assimilated finite volume coastal ocean model     

Yang Ding  Xianwen Bao  Huaming Yu  Liang Kuang 《Ocean Dynamics》2012,62(4):515-532

The tides and tidal energetics in the Indonesian seas are simulated using a three-dimensional finite volume coastal ocean model. The high-resolution coastline-fitted model is configured to better resolve the hydrodynamic processes around the numerous barrier islands. A large model domain is adopted to minimize the uncertainty adjacent to open boundaries. The model results with elevation assimilation based on a simple nudge scheme faithfully reproduced the general features of the barotropic tides in the Indonesian Seas. The mean root-mean-square errors between the observed and simulated tidal constants are 2.3, 1.1, 2.4, and 1.5 cm for M₂, S₂, K₁, and O₁, respectively. Analysis of the model solutions indicates that the semidiurnal tides in the Indonesian Seas are primarily dominated by the Indian Ocean, whereas the diurnal tides in this region are mainly influenced by the Pacific Ocean, which is consistent with previous studies. Examinations of tidal energy transport reveal that the tidal energy for both of the simulated tidal constituents are transported from the Indian Ocean into the IS mainly through the Lombok Strait and the Timor Sea, whereas only M₂ energy enters the Banda Sea and continues northward. The tidal energy dissipates the most in the passages on both sides of Timor Island, with the maximum M₂ and K₁ tidal energy transport reaching about 750 and 650 kW m^–1, respectively. The total energy losses of the four dominant constituents in the IS are nearly 338 GW, with the M₂ constituent dissipating 240.8 GW. It is also shown that the bottom dissipation rate for the M₂ tide is about 1–2 order of magnitudes larger than that of the other three tidal components in the Indonesian seas.  相似文献   

A two-dimensional morphological model based on next generation circulation solver II: Application to Caofeidian, Bohai Bay, China     

Cui-Ping Kuang  Si-Yu Chen  Yu Zhang  Jie GuLing Deng  Yi PanJing Huang 《Coastal Engineering》2012,59(1):14-27

This paper is a companion of a two-part papers on the development of a two-dimensional morphological model—CurWaC2D-Sed, based on next generation circulation solver. In this paper, the model developed in paper I is applied to the large-scale construction of near-harbor industrial zone with deep water harbor by reclamation in Caofeidian, Bohai Bay, which is a typical sandbar-lagoon bay-type tidal inlet system. Characteristics of tides, currents, waves and sediments in Caofeidian are firstly analyzed with field data from comprehensive field observations carried out in 2008. These data are then used for model calibration and validation, showing a good agreement between simulated results and field measurements for tides, currents and suspended sediments. The verified model is applied to study the effects of the construction of Caofeidian embankment and the on-going engineering scheme on hydrodynamics and sediment transports as compared with no constructions under three representative tide conditions and their combinations with normal and strong waves as well as on morphology evolution. The simulated results indicate that the present scheme leads to morphological changes in Caofeidian with acceptable rates of erosion and sedimentation. However, some attentions should be paid to erosion at offshore wharf in front of Caofedian foreland which may lead to potentially increasing landslide risks due to steep slope and sedimentation in Laogonggou creek.  相似文献   

天津市热储规划分区和地热井审批系统研发     

李学元  何满潮 《吉林大学学报(地球科学版)》2015,45(2):546-551

为解决天津市地热工作中大量地热地质专业数据处理工作周期长与管理决策快速、科学要求相矛盾的问题,满足地热开发利用科学规划发展的要求,为资源的可持续开发利用提供操作简单、智能的工具和手段;在过去天津地热工作的基础上,提出了"两线一面"三维动态分区方法,利用MapGIS SDK及Visual Basic开发了地热工程热储规划分区及地热井审批查询系统。该系统的开发为规划的制定和落实提供了快速、全面、直观的规划分区,并且具有动态跟踪功能。在规划期间内,每年根据热储动态观测数据,利用该系统制作一套年度规划分区图,供管理部门掌握规划情况和动态审批。  相似文献