中国东北区二叠纪和早三叠世地层   总被引：4，自引：1，他引：4  

苏养正 《吉林地质》1996,(Z1)

本文运用裂陷槽理论，提出了早二叠世地层发育于大石寨、大河深和庙岭三个裂陷槽中。晚二叠一早三叠世则以陆相凹陷沉积为特征，发育于兴安岭、张广才岭及完这山三个凹陷内。  相似文献   

下辽河坳陷现代应力场特征   总被引：2，自引：0，他引：2  

黄雨蕊  许忠淮 《中国地震》1997,13(2):114-119

本文通过辽河油田的钻孔崩落资料及小地震震源机制解，推断出辽河坳陷地区现代构造应力场的特征。两种方法得到的结果基本一致，即区域应务场和局部应力场的结果一致，该地区处于走滑断层型应力状态。  相似文献   

泌阳凹陷核桃园组微量元素演化特征及其古气候意义   总被引：31，自引：6，他引：31  

王随继  黄杏珍 《沉积学报》1997,15(1):65-70

泌阳凹陷下第三系核桃园组总体上表现为一个大的湖退体系，而其中的微量元素含量及有关元素比值却呈现出细微而明显的旋回变化特征。本文依据泥岩、页岩和碳酸盐岩中Ｔｉ、Ｓｒ、Ｂａ等十六种微量元素含量及Ｓｒ/Ｂａ、Ｆｅ/Ｍｎ、Ｓｒ/Ｃｕ等七种比值的变化特征，结合古盐度及岩相资料，对核桃园组沉积时的古气候作了系统的研究，基本上分出了温暖潮湿、干湿交替、炎热干旱、温热半干旱四类较为特征的古气候类型，以期为油气勘探提供依据。  相似文献   

河北省阳原县地质灾害调查与区划     

韦红钢高幼龙  谢乐云 《华东地质学院学报》2004,27(4):345-349

结合地质灾害调查与区划项目中“以人为本”的思想，根据阳原县具体的地理情况、地质环境，分析引起地质灾害的主要因素，查明区内存在的地质灾害隐患，对地质灾害进行区划，划分出地质灾害危险区、易发区、稳定区，并依据区划结果提出治理阳原县地质灾害的切实可行的建议，指出在不同地质灾害区中采取不同处理措施。  相似文献   

河北平原南部曲周地区河间洼地沉积若干特征及相关问题——对吴忱等问题的回答   总被引：1，自引：0，他引：1       下载免费PDF全文

王红亚  石元春  于澎涛  汪美华  郝晋民  李亮 《第四纪研究》2004,24(1):105-109

河北平原南部曲周地区一河间洼地剖面中240cm,160cm和80cm深度处的AMS¹⁴C测年结果分别为10210±80aB.P.,8270±70aB.P.和6500±60aB.P.。由这3个测年数据和代用指标数据相结合推测的曲周地区全新世古环境状况及其变化与其他研究者在其他地区,尤为河北平原其他地区所获的结果是相同或相似的,并且在时间上是吻合的。由这3个数据推导的沉积物的埋深、厚度、堆积速率以及岩性等特征大都是这一剖面所处沉积环境和构造活动部位的反映,与前人有关河间洼地沉积的基本特征及其影响因素的阐述是相符的。充分认识河间洼地沉积物的特征,尤为其与河道沉积等的差别,对于更全面、深入地了解河流系统可能是有益的  相似文献   

大同市(平原区)地下水超采现状及治理措施   总被引：3，自引：0，他引：3  

王宏  吕玉萍 《地下水》2004,26(4):297-299

通过分析大同市平原区地下水超采现状,指出地下水超采容易引起的水环境问题,针对日益紧张的水资源供需矛盾和地下水起采引起的水环境问题,提出了超采区的治理措施.  相似文献   

Development of joints and shear fractures in the Kuqa depression and its implication to regional stress field switching     

Zhang Zhongpei  WANG Qingchen 《中国科学D辑(英文版)》2004,47(Z2)

The superimposed basin must have undergone the changes of regional stress field. Study on the nature and switch of regional stress field of superimposed basin is very useful to understanding its stress state and tectonic events during its formation and evolution. As sensitive markers of small stress changes, joint and shear fracture, characterized by consistency of orientation over wide area, can be used to reconstruct paleostress state and its evolution. Detailed observations and analysis on the orientations, geometrical patterns, sequences of joints and shear fractures and their chronological relation to faults and folds show that, the NEE-SWW systematic joints and NNW-SSE systematic joints developed in the Mesozoic and Cenozoic strata are much more prominent than NW-SE systematic joints and shear fractures with different orientations. And the NWW-SEE and NW-SE systematic joints formed later than NEE-SWW systematic joints but earlier than shear fractures with different orientations. According to the relationships between joint and shear fractures and stress, the NEE-SWW systematic joints are inferred to result from lateral weak extension caused by the late Cretaceous regional uplift, while the NNW-SSE and NW-SE systematic joints are interpreted as syn-tectonic deformation relating to strong N-S compression in the Neogene. But some conjugate shear fractures occur probably due to sinistral strike-slip faulting in the Kuqa depression. At the beginning of the Neogene, the stress field changed and the maximal principal stress σ1 switched from vertical to horizontal.  相似文献   

A Preliminary Analysis of Relations Between Tectonic Deformation of Sedimentary Cover and Basement in Kuqa Depression     

Liu Jie 《中国地震研究》2004,18(4):406-416

Study of seismic activity in the Kuqa area enables us to infer some possible active faults in basement from the epicentral distribution on different profiles. The relations between active faults in the basement and surface structures are analyzed and the difference between sedimentary cover and basement in their deformation characteristics and the genesis are discussed. The following conclusions have been drawn : ( 1 ) the epicentral distribution indicates that, the east Qiulitag and south and north Qiulitag deep faults in the basement correspond to the east and west Qiulitag anticlines, respectively. Moreover, deep faults also exist beneath the Yiqiklik and Yaken anticlines. It indicates that the formation of surface structures is controlled by deep structures; (2) A NE-trending strike-slip fault develops along the line from the western termination of Yiqiklik structure to Dongqiu Well 5 and a NW-trending active fault on the western side of Baicbeng. The two active faults across the tectonic strike are the main causes for tectonic segmentation of the Kuqa depression and possibly the cause for the middle segment (Kuqa-Baicheng) of the depression to be more shortened than both its eastern and western terminations; (3) The difference between the sedimentary cover and basement in their deformation characteristics depends mainly on the different properties of media between them.The lithospheric strength of the basement in the basin is fairly high, which determines the basement deformation to be mainly of brittle fracture seismic activity. While the strength of sedimentary cover is low, where there exist weak thin layers, such as coal and gyps. Under the effect of strong tectonic compression, the sedimentary rocks may undergo strong viscous or plastic flow deformation; meanwhile, an aseismic detachment may take place along the weak layers.  相似文献   

冀中坳陷-黄骅坳陷馆陶组热储发育差异性及成井条件     

沈俊超  王学工  贾兰凤  公利华 《水文地质工程地质》2004,31(3):40-43,54

本文论述了冀中坳陷-黄骅坳陷馆陶组热储砂岩、底部砾岩、砂砾岩的发育、孔隙度及热水水质的差异性,对热储出水特征进行了探讨,提出了馆陶组热储成井的基本条件,对冀中坳陷-黄骅坳陷馆陶组热储成井具有一定的指导意义。  相似文献   

Mesoscale Diagnosis of a Torrential Rainfall Caused by a Tropical Depression     

YU Hui  LIANG Xudong  DUAN Yihong  QI Liangbo 《Acta Meteorologica Sinica》2005,19(2):226-230

On August 5, 2001, Shanghai was struck by a torrential rainfall due to the passage of a tropical depression (TD). The rainfall intensity has been the strongest in recent 50 years. In this paper, a set of mesoscale re-analyses data and the planetary boundary layer observation from a wind profiler are used to understand the possible mechanism of such a heavy rain. Results show that the outburst of a southerly jet in the lower atmosphere triggered the explosive development of cyclonically vertical vorticity in the region with steep potential temperature surfaces in front of the TD; while the cyclonic vorticity increased notably at higher levels due to the small atmospheric vertical stability of westerly currents in the vicinity of Shanghai. The simultaneous sharp development of cyclonic vorticity at different levels should be the main cause for the torrential rainfall.  相似文献