环渤海区域及邻区现今地壳构造运动形变特征分析     

赵旭坤  张俊  雷前坤  范成成 《大地测量与地球动力学》2019,39(11):1101-1105

将环渤海区域划分为5个次级块体，利用整体旋转与线性应变模型分析2009~2014年中国大陆构造环境监测网络的GPS对地观测速度场数据，得到相对于欧亚板块0.5°×0.5°的水平运动速度场和应变场。分析形变速度场和应变场的空间变化发现，环渤海区域整体上呈现0.25×10^-9/a的NW-SE 111.3°的双向趋势性扩张运动，太行块体、山西块体分别呈NW-SE 116.3°、NW-SE 130°的微弱扩张运动，胶辽块体、冀鲁块体和阴山-燕山块体分别存在NW-SE 144.3°、NE-SW 39.5°和NW-SE 155.6°的微弱压缩运动，其中太行块体的扩张运动量级相对于其他次级块体较大。尽管环渤海区域内部各次级块体的形变在空间上存在以上差异，但整体上环渤海区域主压应变轴方向基本为NEE-SWW，主张应变轴方向为NNW-SSE，且主压应变轴走向为NE 47.70°～89.74°，与利用地球物理方法得到的主压应变轴优势方向大体一致，表明环渤海区域现今地壳运动相对稳定。  相似文献   

Paleogene of the Huanghekou Sag in the Bohai Bay Basin,NE China: deposition–erosion response to a slope break system of rift lacustrine basins     

Hao Liu  Qinglong Xia  Ian D. Somerville  Yuan Wang  Xinhuai Zhou  Chengmin Niu  Xiaofeng Du  Xintao Zhang 《Geological Journal》2015,50(1):71-92

The sequence architecture and depositional systems of the Paleogene lacustrine rift succession in the Huanghekou Sag, Bohai Bay Basin, NE China were investigated based on seismic profiles, combined with well log and core data. Four second‐order or composite sequences and seven third‐order sequences were identified. The depositional systems identified in the basin include: fan delta, braid delta, meander fluvial delta, lacustrine and sublacustrine fan. Identification of the slope break was conducted combining the interpretation of faults of each sequence and the identification of syndepositional faults, based on the subdivision of sequence stratigraphy and analysis of depositional systems. Multiple geomorphologic units were recognized in the Paleogene of the Huanghekou Sag including faults, flexures, depositional slope break belts, ditch‐valleys and sub‐uplifts in the central sag. Using genetic division principles and taking into consideration tectonic features of the Paleogene of the Huanghekou Sag, the study area was divided into the Northern Steep Slope/Fault Slope Break System, the Southern Gentle Slope Break System and T10 Tectonic Slope Break System/T10 Tectonic Belt. Responses of slope break systems to deposition–erosion are shown as: (1) basin marginal slope break is the boundary of the eroded area and provenance area; (2) ditch‐valley formed by different kinds of slope break belts is a good transport bypass for source materials; (3) shape of the slope break belt of the slope break system controls sediments types; (4) the ditch‐valley and sub‐sag of a slope break system is an unloading area for sediments; and (5) due to their different origins, association characteristics and developing patterns, the Paleogene slope break belt systems in the Huanghekou Sag show different controls on depositional systems. The Northern Fault Slope Break system controls the deposition of a fan delta‐lacustrine‐subaqueous fan, the Southern Gentle Slope Break system controls the deposition of a fluvial–deltaic–shallow lacustrine and sublacustrine fan, and the T10 Tectonic Slope Break System controls the deposition of shallow lacustrine beach bar sandbodies. The existence of a slope break system is a necessary but not a sufficient condition for studying sandbody development. The formation of effective sandbodies along the slope break depends on the reasonable coupling of effective provenance, necessary association patterns of slope break belt, adequate unloading space and creation of definite accommodation space. Copyright © 2013 John Wiley & Sons, Ltd.  相似文献   

渤海湾沿岸晚第四纪地层划分及地质意义   总被引：2，自引：0，他引：2  

胥勤勉  袁桂邦  张金起  秦雅飞 《地质学报》2011,85(8):1352-1367

本文以4个钻透上更新统钻孔为例,以岩性和沉积构造为基础,采用“C、微体和孢粉等分析方法,结合气候地层和层序地层学的理论,对渤海湾晚第四纪地层进行了划分,讨论了岩相古地理和新构造特征.渤海湾沿岸晚第四纪地层可以划分为9组地层,自下而上分别为海洋氧同位素5e(MIS5e)、MIS5d、MIS5c、MIS5b、MIS5a、M...  相似文献   

莺歌海盆地DF1-1-11井有孔虫生物地层与沉积环境研究   总被引：1，自引：0，他引：1  

何卫军  谢金有  刘新宇  李珊珊 《地层学杂志》2011,(1):81-87

结合ODP184航次及2008年"国际地层表"等研究成果,对莺歌海盆地基准井DF1-1-11井岩屑地层(630～3508 m)的有孔虫定量分析资料进行研究,建立可靠的生物地层及年代地层格架,并通过对钻井中有孔虫丰度、分异度、浮游比例、组合特征及古水深估算分析,讨论了DF1-1一11井中中新世以来的沉积环境演化.研究结果...  相似文献   

Tectonics and Mechanisms of Uplift in the Central Uplift Belt of the Huimin Depression     

倪金龙  郭颖  王智敏  刘俊来  林玉祥  李月 《中国地质大学学报(英文版)》2011,(3)

The Huimin (惠民) depression is a third-level tectonic element of the Bohai (渤海) Bay basin in eastern China. The central uplift belt is the most important oil and gas accumulation zone in the depression, but the lack of adequate geological studies in the area has greatly hindered exploration and development. In this article, using seismic data, fracture mechanics, and a combination of data on fault growth indices and fault throws, we present an analysis of tectonic activity in the central uplift belt and adja...  相似文献   

地面沉降对渤海湾风暴潮灾害防治的影响研究     

王威  周俊  易长荣 《城市地质》2011,6(4):31-35

渤海湾沿海地区地面沉降严重、风暴潮灾害频发。本文以天津作为典型区域,对风暴潮潮位测定、风暴潮灾害和防风暴潮预案措施等方面开展研究,认为地面沉降对上述3方面均有的不同程度的影响,在风暴潮灾害防治中必须考虑地面沉降问题。  相似文献   

渤海湾全新世贝壳堤与牡蛎礁:古气候与海面变化   总被引：6，自引：3，他引：3  

王宏  陈永胜  田立柱  李建芬  裴艳东  王福  商志文  范昌福  姜兴钰  苏盛伟  王海峰 《地质通报》2011,30(9):1405-1411

讨论了早全新世晚期以来渤海湾西岸贝壳堤平原成堤、西北岸牡蛎礁平原(及毗邻浅海区)建礁过程的同时性特征和气候变化与这一特征之间的关系,以及堤、礁记录的相对海面变化。堤、礁大致同时发育,可分为6期,依次分别被寒冷事件5、4、3、2和1分隔。堤底板前、后缘高差大致对应3m的大潮差、礁顶板大致对应海平面。据二者分别重建了南部贝壳堤平原、北部牡蛎礁平原的相对海面变化:南部自7ka cal BP以来基本与现代海平面等高,小的波动在±1m之间,压实固结作用抵消了中全新世的相对高海面;北部中全新世的相对海平面位置因新构造和固结压实双重下沉作用的影响,已位于现代海平面2~3m以下。  相似文献   

Composition and ecological distribution of ichthyoplankton in eastern Beibu Gulf   总被引：1，自引：0，他引：1  

ZHOU Meiyu  LIN Yuanshao  YANG Shengyun  CAO Wenqing  ZHENG Lianming 《海洋学报(英文版)》2011,30(1):94-105

Surveys were conducted in four seasons in the eastern Beibu Gulf from July 2006 to November 2007,to determine the ichthyoplankton composition,abundance,as well as environmental factors impacted on their spatiotemporal distributions.The fish eggs and larvae were sorted from 303 zooplankton quantitative samples,in which at least 1 order,60 families,31 genera and 61 species of fish eggs and larvae were identified.The species number was highest in summer whereas lowest in winter.With the most abundant fish egg (the average density was 2.41 ind./m 3),spring was the main spawning season,while the greatest mean density of fish larva was 1.35 ind./m 3 in summer.In the whole year around,fish eggs had the trends to aggregate in the nearshore of Guangxi coast,fish larvae were more abundant in the northern water.Relationships between fish eggs and larvae abundance and environmental factors were analyzed by using the Yield-Density model.The spatiotemporal distribution of ichthyoplankton in eastern Beibu Gulf was closely related to the Chl a concentration,and the optimal temperature,salinity and Chl a were 19.4-21.7 C,31.8-33.1 and 1.5-4.8 mg/m 3,respectively.Additionally,the distribution of fish larvae could be effected by ocean currents in summer and autumn.  相似文献   

Distribution of suspended particulate matter in the northern Bohai Bay in summer and its relation with thermocline     

L.L. Qiao  Y.Z. Wang  G.X. Li  S.G. Deng  Y. Liu  L. Mu 《Estuarine, Coastal and Shelf Science》2011

Field observations of suspended particulate matter (SPM) in the Bohai Bay, China have not been widely reported. The aim of this paper is to describe the horizontal and vertical distribution of mass and volume concentrations of SPM, respectively, based on observed data at 312 stations in the northern Bohai Bay during summer of 2006. A numerical model ECOMSED coupled with a sediment transport module was also established to further discuss the mechanism of the thermocline effect on the vertical distribution of SPM. The mass concentrations of SPM exhibited high inshore values and low offshore values in the horizontal distribution; while in the vertical direction, characteristics of the volume concentration of SPM can be divided into two types: one with a sharp peak at depth of 10–15 m and another without. The peak value at the depth of the thermocline was resulted from concentrated phytoplankton. A numerical experiment further displayed that the thermocline can also prevent particles from being resuspended upward.  相似文献   

Seasonal variation of suspended-sediment transport through the southern Bohai Strait   总被引：2，自引：0，他引：2  

Naishuang Bi  Zuosheng Yang  Houjie Wang  Dejiang Fan  Xiaoxia Sun  Kun Lei 《Estuarine, Coastal and Shelf Science》2011

Based on field observations made in winter 2006 and summer 2007 and on multiscene MODerate resolution Imaging Spectrometer (MODIS) imagery, the seasonal variation of suspended-sediment transport in the southern Bohai Strait and its possible mechanisms are examined. The field observations in two different seasons allow an exponential empirical model to be used to retrieve suspended-sediment concentration (SSC) from MODIS imagery. Both the field-survey data and the MODIS-derived SSC show that the sediment transport in the southern Bohai Strait has a significant seasonal variation due to the seasonally varying thermohaline structure of the water column and the hydrodynamics resulting from the seasonally alternating monsoons. The SSC in winter is approximately 3–10 times higher than in summer. Considering the seasonal variation of water flux (WF) and SSC, the annual sediment flux (SSF) through the southern Bohai Strait is estimated to be approximately 40.0 Mt yr⁻¹, about 4–8 times previous estimates, which did not take into account seasonal variation. Although the Huanghe (Yellow River) discharges a large amount of sediment in the summer, the SSF through the southern Bohai Strait in the winter (∼32.0 Mt) is about 4 times greater than it is in the summer. The strong seasonal variability of SSF through the southern Bohai Strait indicates that strong resuspension along the coast of the Huanghe delta in winter and enhanced longshore transport by coastal currents due to winter monsoon activity might be the major mechanisms of cross-strait transport of sediment in winter.  相似文献